この作品は、自然科学とカナダの工学研究評議会（RGPIN 238382から2011）およびヘルスリサーチ（MOP115076）のカナダの研究所からの助成金を介してサポートされていました。ヘザー・ポールは、自然科学とカナダの工学研究審議会大学院奨学金とアルバータ革新健康ソリューション奨学金によってサポートされていました。ミーガン・ハラムは、自然科学と工学研究評議会大学院奨学金、フレデリック・バンティングとチャールズベストカナダ大学院奨学金、およびアルバータ州の小児病院研究所研修遺伝学賞、子どもの発達、および健康によってサポートされていました。

このプロトコルは、カルガリー大学の動物実験委員会によって承認され、 実験動物の管理と使用に関する指針に準拠しました。 子孫から1.個別のダム<ol><li> 12を搾乳する前に、5分の最小のための彼女の子孫からダムを区切ります。 注：ダムは、しかし長い4時間以上の分離の期間は、乳組成物14 を変更することができる 、分離1,6,13後5-6時間までに搾乳することができます。分離時間はミルク収集量12に影響を与えるようには見えないが、それは、一貫した分離時間は、研究を通じて維持されることをお勧めします。授乳15全体に変更されることがあり乳組成物は、そのための試みは、一貫性のあるミルクのコレクションの一日を維持するためになされるべきです。最大の牛乳生産は、泌乳14日目12で発生することが示唆されています。 </li><li>温暖化室を使用して、子犬が適切な体を維持することができる確実temperatu搾乳手順の間、母親の存在なしに再。 注：以下に示す研究では、搾乳は、したがって、何の温暖化室は使用されなかった、ダムは約22週齢で子孫21日齢時、離乳で実施しました。 </li></ol> 2.セットアップと準備<ol><li>搾乳手順に必要なすべての材料を収集します。 注：すべての材料は、材料や機器の表に記載されています。 </li><li>搾乳が行われ、アンダーパッド吸収性ベンチでパッドをカバーするベンチに加熱パッドを配置します。 </li><li>麻酔システムを設定します。システムに十分な酸素や開始前イソフルランを持っていることを確認してください。マシンへの最初の麻酔導入のために使用される麻酔マスクを取り付けます。近くの初期麻酔マスクと異なる場合、麻酔の維持のために使用されるマスクを配置します。 </li><li>オキシトシン1 mlシリンジに、25G針を取り付け無菌技術を用いて注入。 </li><li>母体の体温は搾乳手順の間に維持されるように、加熱パッドをオンにします。注：あまりにも高温になり、やけどを起こさないパッドを確実にするために加熱パッドの温度を監視します。あるいは、特定の温度に設定することができる加熱手術台などの熱源を使用します。 </li></ol> 3.イソフルランを使用してダムを麻酔<ol><li>酸素タンクを開き、毎分1リットル（千CC）への流れを向けます。イソフルランの流れをオンにして、5％に設定されています。注意：麻酔薬の直接吸入を避け、麻酔蒸気の蓄積を防ぎます。 </li><li>ダムを麻酔。 </li><li>必要に応じて、吸収ベンチパッドの上にダム仰向けに配置し、メンテナンスマスクに切り替え。ペダル反射の欠如によって麻酔を確認してください。 </li><li>麻酔の維持のために2〜3％のイソフルランの流れを減らします。継続ドを確保するための手順を通じてダムを監視呼吸のPRESSIONは発生しません。注：一度麻酔下で、ダムの目が乾燥や傷​​になってから目を防ぐために、無菌の目の潤滑剤を使用して保護する必要があります。 </li></ol> 4.オキシトシン注射液<ol><li>オキシトシンを確認します（20 USP単位/ ml）を、その有効期限を経過していません。 /アルコールクレンジングパッドを拭き、滅菌アルコールでオキシトシンのバイアルを消毒します。 </li><li>無菌技術を使用して、シリンジ内にオキシトシンの2 IU（0.1 ml）を描きます。搾乳される各ダムのための新しい針と注射器を使用してください。 注：オキシトシンの投与量は、一般的に1の単回注射から5 IU 1,6,12,16の範囲。あるいは、4 IU / kg体重の投与量は、12を使用することができます。難易搾乳が発生した場合2 IUの単回投与は、一回繰り返すことができます。 </li><li>腹腔内にオキシトシンを注入。角度で、針が頭の方を向いて腹部の右下の象限に針を挿入します15〜30°の、約0.5cmの深さです。 </li><li>注射前に、負圧を確保するために、プランジャーを後方に引いて。任意の流体（血液、尿、腸の内容物など ）が注射器内に吸引されている場合は、針を削除し、新しい針と注射器で注入を試みます。何の流体が吸引されていない場合はオキシトシンを注入し、すぐにバイオハザード容器に針と注射器を廃棄します。 </li><li>ミルクレットダウンを刺激するオキシトシンのために約5〜15分待ちます。 </li></ol>搾乳サイトの5準備<ol><li>牛乳が収集されるからサイト/乳首を選択してください。乳は、任意の乳頭12から回収することができます。 </li><li>毛皮は、牛乳の吸い上げによるサンプル収集の難しさを引き起こす可能性があるとして慎重に、トリマーで搾乳される乳首の周りに毛皮を削除します。穏やかな - 乳首の周りの皮膚は非常に敏感で、乾燥していてもよく、のような傷や涙の影響を受けやすいです。 </li><li>乳首iの滅菌必要じゃないが、毛を除去した後、必要に応じて、ぬるま湯で乳首をきれいに。複数のサイトのような少なくとも二つの部位を調製するミルクコレクションのために必要とされてもよいです。 注：ミルク分析は、微生物プロファイリングが含まれる場合は、乳頭領域は、ヨウ素5に滅菌を必要とするかもしれません。 </li></ol> 6.ミルクコレクション<ol><li>静かに手動でコレクションのミルクを排出、乳首の根元を絞ります。 注：ミルク分析は、微生物プロファイリングが含まれている場合は、ミルクの最初の数滴は廃棄されるべきです。 </li><li>毛細管を充填し、毛細管内にミルク液滴を集めます。大容量（例えば、50μl）を収容するキャピラリーチューブは、プロセスを容易にします。 注：ミルクを収集することが困難に遭遇した場合には、オキシトシンの第二の用量を投与することができます。これは、投与量は4 IUの合計を超えないことをお勧めします。 </li><li>により滅菌マイクロチューブに毛細管からミルクを分配します毛管作用を介して毛細管から引き出されているミルクを観察する - マイクロ遠心チューブの側面に乳首からミルクを引き出すために使用された管の端部に触れます。 注：1 mlシリンジに取り付けた18 G針を使用してチューブに引き込まれていないミルクを「吹き飛ばし」。 </li><li>継続的に痛みや呼吸抑制の兆候がダムを監視し、それに応じてイソフルランの流れを調整します。 </li><li>このセクションで説明するように、十分なミルクが選ばれたミルク分析のために収集されるまで、ミルクを収集し続けます。 creamatocritとタンパク質濃度の決意は、以下に説明するために、ミルクの0.25ミリリットルを収集します。 注：ミルクレットダウンが遅くなるか、選択したサイトが十分に牛乳を追放しない場合、別の搾乳サイトを使用してください。動物当たりの乳の約2.5 mlで最大17、または乳頭あたり0.5 mlまで収集することができます。著者は、O、麻酔下の合計時間は約45〜60分に制限されることをお勧めします搾乳の45分rは。 </li><li>新鮮な牛乳サンプルからcreamatocrit測定用マイクロヘマトクリット管にミルクを収集し、粘土シーラントでチューブの端部をシールします。ダムIDでミクロヘマトクリットチューブにラベルを付け、直立ミルク試料を保存します。 </li><li>搾乳が完了すると、イソフルランと酸素の流れをオフにします。ダムからマスクを外し、目を覚ましまでダムの監視を継続します。それは完全に意識されていない場合、ダムが吸引さまたは復元中のダムの目を傷から寝具を防止するために、ケージの寝具ではなく直接よりも、回復期間中に、吸収ベンチパッドの上に置かれるべきであることをお勧めします。 注：それは胸骨recumbancyを維持するのに十分な意識を取り戻したまで無人ダムに放置しないでください。 </li><li>更なる分析が必要とされない場合は、-80℃でミルクを凍結。他の人はミルクが-20℃18で3時間まで4℃で、または5ヶ月間保存することができることを示唆しています。 </li></ol> 7. Creamatocrit測定<ol><li>ミルクcreamatocrit（ミルク試料中のクリームの割合）19を計算することにより、ミルク中の脂肪含量を推定します。 注：母乳で測定が新鮮または凍結のいずれかミルクがcreamatocrit測定のために使用することができることを実証している、しかし、新鮮な牛乳は、より高度に脂質濃度11（R = 0.90対R = 0.92）相関しています。解凍したミルクはcreamatocrit 11値でわずかな減少と関連しているようcreamatocrit測定のための新鮮または凍結したミルクの使用は、研究全体の一貫性が保たれるべきです。 </li><li>新鮮な牛乳の場合、ミクロヘマトクリット管に乳首からミルクのサンプルを収集します。少なくとも¾フル（約15〜20μl）を記入してください。また、よく混合した後、キャピラリーチューブに採取した試料からの新鮮な牛乳を描きます。粘土シーラントで終了をシール。 </li><li>で、ヘマトクリットスピナーに毛細管を配置密封端遠心機はバランスが取れて確保し、外側に向かって指しています。 </li><li>ヘマトクリットスピン（13,700×gで120秒）を開始します。 注：スピン時間や速度は使用遠心分離機のモデルに応じて変更されることがあります。 </li><li>スピンが完了した後に遠心分離機からチューブを外し、creamatocritを算出するための測定を行います。クリーム層と透明層内に試料の分離を観察します。 </li><li>測定し、チューブ内の流体の合計の長さと脂肪（クリーム）の長さノギスや定規を使用したレイヤを記録します。 注：（クリーム層/ミルク列の全長の長さ）として算出したミルク試料19内のクリーム層の割合は、100（ 図1A）xとcreamatocritが発現されます。次のようにcreamatocrit測定から脂肪濃度及びエネルギー値を計算する：脂肪濃度（g / L）=（creamatocrit（％） - 0.59）/0.146（ 図1B）19。エネルギー値（KCアル/ L）+ 290（66.8 * creamatocrit（％）（ 図1C）= 19。 </li></ol> 8.タンパク質濃度の決意<ol><li>タンパク質標準としてウシ血清アルブミンを用いて、例えば、ローリー法6のような標準的なタンパク質アッセイを用いて、全乳タンパク質の濃度を決定します。 注：乳タンパク質の測定値がアッセイの標準曲線内に入るようにするためのミルクの希釈が必要であり得ます。 </li></ol>

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B. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Fat+and+energy+contents+of+expressed+human+breast+milk+in+prolonged+lactation.">Fat and energy contents of expressed human breast milk in prolonged lactation.</a> Pediatrics. 116 (3), e432-e435 (2005).</li></ol>

著者らは、開示すること、関心の競合がありません。全ての動物実験は、CCAC承認されたプロトコルに従って行いました。

Investigations into maternal milk components have increased as interest in early life development research rises. As the sole source of nutrition during the neonatal period, the bioactive compounds in milk are essential for ideal growth and development, especially in the context of intestinal and immune health3. The method presented here is a simple, non-invasive method of collecting milk from the lactating rat in amounts sufficient for downstream analysis, such as oligosaccharide profiling6. The method requires no specialized vacuum equipment and can be performed by a single person. 
While this protocol is intended for use at a single time point during lactation, others have performed serial milk collections throughout their studies12,15. However, as serial milking may affect milk composition17, it is advised that researchers determine the frequency and number of milk collections that best suit their study, based on the outcome of interest. Additionally, while others have used injectable anesthetics during milking procedures in the rat14,17, this protocol involves anesthetization of the rat using isoflurane. Isoflurane is an inhalable anesthetic, and its advantages include rapid induction and recovery rates20 and the ability to easily adjust the time the animal is anesthetized. However, in mice, isoflurane may result in decreased milk yield in comparison to injectable anesthetics10, although this does not seem to have been tested in rats. Furthermore, protocols involving vacuum suction may not require anesthetic, and may result in higher milk yield depending on the efficiency of the suction apparatus12. However, if proper suction does not occur, milk yield will decrease. 
It is possible for the researcher to encounter difficulty in manual expression of milk, which can prolong time under anesthesia or decrease the milk yield. If difficulty in milking is encountered, some possibilities are: 1) sufficient time has not passed for the oxytocin to take effect; 2) improper or inexperienced milking technique; 3) physical differences in the nipple; 4) incorrect intraperitoneal injection of the oxytocin. The researcher may therefore wait a few more minutes prior to attempting to milk again; if this does not result in increased milk yield, the researcher may choose to move to a different milking site. Using a vacuum, each set of teats (upper thoracic, lower thoracic, upper abdominal, and lower abdominal) was equally successful in expelling milk when the milker is proficient, and approximately 0.5 ml can be obtained from each teat12. Therefore, if one milking site is proving difficult, moving to another site may help. The authors are not aware of differences in milk composition between milking sites. Finally, a second dose of oxytocin may be administered to further stimulate milk letdown. Diluting the oxytocin to a standard dose volume/kg body weight can also be attempted, for example 1 ml/kg body weight12, however be aware of maximum intraperitoneal injection volumes. 
It is also possible that other factors, including but not limited to, rodent strain, health status, parity, litter number, level of stress, diet, time of day, and food intake may affect the outcome of the milk collection. While the discussion of all these variables is beyond the scope of this protocol, it is encouraged that the investigators consider the multitude of factors that may influence the efficiency of milk collection in their experiments.
Finally, a simple method of measuring the proportion of cream in the milk, the creamatocrit, which is an accurate estimation of the amount of lipid in the samples11, is described herein. The creamatocrit can then be used to estimate the fat concentration and energy value of the milk. Though there were no differences in creamatocrit, fat concentration, energy value, or protein concentrations between the maternal dietary groups in the results presented above, others have found differences in creamatocrit values based on maternal characteristics such as gestational age21 and duration of lactation22. Differences in oligosaccharide content in maternal milk has also been demonstrated with maternal dietary manipulation6. 
In summary, milk contains a plethora of bioactive compounds whose specific roles in early life development of offspring, and their subsequent effect on disease susceptibility throughout life, remain to be clarified. The protocol reported here allows milk to be collected from lactating rats by a single individual, requires no specialized vacuum apparatus, and provides sufficient milk for subsequent analysis. Mastering this technique will provide the researcher with the opportunity to contribute significant insight into the processes involved in early-life development and establishment of health.

ミルクは乳児の成長と発展の1,2のためのエネルギーや栄養素を提供し、新生児の哺乳動物のための唯一の栄養源です。ミルクは、主に、細胞、脂質、およびタンパク質1で構成されている間、それはまた、酵素、炭水化物、ホルモン、抗体、成長因子、サイトカイン、エキソソーム、マイクロベシクル、及びそのような低分子RNAを含む子孫の若年期の発達を調節する生物活性化合物の多数を含んでいますマイクロRNA 1,2として。幼児は病気2を受けにくい母乳証拠と相まって免疫子孫と腸の健康3の確立に母乳の基本的な役割は、人生の早い段階で病気のプロセスに関連付けられたミルク成分と関与する分子メカニズムを識別することの重要性を強調して彼らの行動です。開発ラットは早い段階で、栄養様々な生理学的、および化学的介入の効果を調べるための人気モデルであります-Life開発4。ラットのミルクの分析は、したがって、母体および子孫の健康に新たな洞察を提供してもよいです。 現在の科学の進歩は今健康と病気の特定の乳成分の効果の詳細な調査のための機会を増やしています。例えば、牛乳細菌プロファイルのシークエンスが幼児の腸5の初期の腸の植民地化におけるそれらの役割を解明した、ミルクオリゴ糖の質量分析は、母体の食事6、中に分泌マイクロRNAの深いシーケンシングを介しミルクオリゴ糖プロフィールの変更への洞察を提供してきました母乳の脂肪球は、遺伝子転写、代謝、および免疫機能7の可能な役割を強調しています。 ラットモデルは、母体の研究8,9で使用される最も人気のあるモデル生物の1つを表します。一つの利点は、唯一approximat持続が短い妊娠及び授乳期間であり、エリー21日各;したがって、授乳に妊娠の開始からの合計時間は貴重なデータを生成することができる時間の短い期間を示します。マウスと比較してラットの大きなサイズは、ミルクのコレクションとの関連で、ミルクおよびミルクの収集の容易さの体積に対して有意な利点を提供し得ます。マウスでの牛乳の生産は、例えば、より多くのミルク10を生成する重いマウスを用いた全体重に依存するように思われます。 ここでは、授乳中のラットからミルクを手動で収集するための一般的な説明が提供されています。このプロトコルは、最小限の設備を必要とする、非侵襲性で、安価で、さらに下流の分析のためにミルクの適切なボリュームを収集するために使用することができます。簡単に言えば、ダムはミルクレットダウンは、オキシトシンによって刺激され、イソフルランで麻酔され、ミルクはミルクのマニュアル発現によりキャピラリーチューブに回収されます。最後に、ミルクの2つの主要コンポーネントは、簡単なdescriptio脂肪とタンパク質であるとして、creamatocrit測定値11及び標準的なタンパク質アッセイを使用して総タンパク質濃度の定量化を用いて、乳脂肪含有量を推定するnが示されています。

<table border="0" cellpadding="0" cellspacing="0" width="829">
	<tbody>
		<tr height="21">
			<td height="21" style="height:21px;width:353px;">Equipment - Milking</td>
			<td style="width:191px;"></td>
			<td style="width:119px;"></td>
			<td style="width:167px;"></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">1 ml syringes</td>
			<td style="width:191px;">BD-Canada</td>
			<td style="width:119px;">309602</td>
			<td></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">25 G needles</td>
			<td style="width:191px;">BD-Canada</td>
			<td style="width:119px;">305122</td>
			<td></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">18 G needles</td>
			<td style="width:191px;">BD-Canada</td>
			<td style="width:119px;">305196</td>
			<td></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">50 ul Microdispenser Capillary Tubes</td>
			<td style="width:191px;">Fisher Scientific</td>
			<td style="width:119px;">21-169D</td>
			<td></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">Oxytocin (20 USP Units/ml)</td>
			<td style="width:191px;">Bimeda-MTC</td>
			<td style="width:119px;">1OXY015</td>
			<td></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:353px;">PPC Vet Isoflurane Inhalation Anesthetic, 250 ml</td>
			<td style="width:191px;">Fresenius Kabi</td>
			<td style="width:119px;">M60302</td>
			<td>Used on the order of a veterinarian</td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">Sterile Alcohol Prep Pad</td>
			<td style="width:191px;">Dukal</td>
			<td style="width:119px;">853</td>
			<td></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">Absorbent Bench Underpad</td>
			<td style="width:191px;">VWR</td>
			<td style="width:119px;">82020-845</td>
			<td></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">Maxi-Therm Hyper/Hypothermia Blanket</td>
			<td style="width:191px;">Cincinnati Sub-Zero</td>
			<td style="width:119px;">274</td>
			<td></td>
		</tr>
		<tr height="42">
			<td height="42" style="height:42px;">Rodent Anesthesia Machine with Vaporizer</td>
			<td style="width:191px;">Benson Medical Industries Inc.</td>
			<td style="width:119px;"></td>
			<td>Subject to individual laboratory needs</td>
		</tr>
		<tr height="42">
			<td height="42" style="height:42px;width:353px;">Animal Masks</td>
			<td style="width:191px;">Benson Medical Industries Inc.</td>
			<td style="width:119px;">50100/50102</td>
			<td></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">Microcentrifuge Tubes</td>
			<td style="width:191px;">Axygen</td>
			<td style="width:119px;">MCT-060-C</td>
			<td></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">ChroMini Professional Trimmer</td>
			<td style="width:191px;">Wahl</td>
			<td style="width:119px;">-</td>
			<td></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:353px;">Equipment - Creamatocrit</td>
			<td style="width:191px;"></td>
			<td style="width:119px;"></td>
			<td></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">StatSpin SafeCrit Plastic Microhematocrit Tubes (Untreated)</td>
			<td style="width:191px;">Fisher Scientific</td>
			<td style="width:119px;">22-274-914</td>
			<td></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">Critoseal Capillary Tube Sealant Tray</td>
			<td style="width:191px;">VWR</td>
			<td style="width:119px;">470161-478</td>
			<td></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">StatSpin CritSpin Microhematocrit Centrifuge</td>
			<td style="width:191px;">Beckman Coulter, Inc</td>
			<td style="width:119px;">X00-004999-001</td>
			<td></td>
		</tr>
	</tbody>
</table>

milk collection in the rat using capillary tubes and estimation of milk fat content by creamatocrit

Milk, as the sole source of nutrition for the newborn mammal, provides the necessary nutrients and energy for offspring growth and development. It also contains a vast number of bioactive compounds that greatly affect the development of the neonate. The analysis of milk components will help elucidate key factors that link maternal metabolism and health with offspring growth and development. The laboratory rat represents a popular model organism for maternal studies, and rat milk can be used to examine the effect of various maternal physiological, nutritional, and pharmacological interventions on milk components, which may then impact offspring health. Here a simple method of manually collecting milk from the lactating rat that can be performed by a single investigator, does not require specialized vacuum or suction equipment, and provides sufficient milk for subsequent downstream analysis is described. A method for estimating the fat content of milk by measuring the percentage of cream within the milk sample, known as the creamatocrit, is also presented. These methods can ultimately be used to increase insight into maternal-child health and to elucidate maternal factors that are involved in proper growth and development of offspring.

ミルクは、コントロールを消費しウィスターダム（約22週齢、350〜400グラムを秤量）（AIN-93G、n = 5）を、高タンパク質から離乳時に説明したように収集された（40％カゼイン重量/重量、N = 5）しました、または高いプレバイオティクス繊維（21.6％重量/重量、1：オリゴフルクトース及びイヌリンの1の比率、N = 4）妊娠中や授乳を通してダイエット。オキシトシン投与量は、IU 2でした。ミルクは、キャピラリーチューブを用いて回収し、一本のチューブは、その後に係る脂肪濃度及びエネルギー値を推定するために使用されたcreamatocrit（ 図1A）を決定するためにヘマトクリットスピンナーを用いて紡糸した：脂肪濃度（G / L）=（creamatocrit（％ ）-0.59）/0.146（ 図1B）。エネルギー値（キロカロリー/ L）= 290 +（66.8 * creamatocrit（％）（ 図1C）は、19。乳タンパク質濃度をBio-Rad DCタンパク質アッセイ（ 図2）を用いて測定した 。creamatocritには差がなかった（P = 0.674）、脂肪濃度（P = 0.674）、エネルギー値（P = 0.674）、O母体の食餌（一方向ANOVA）に基づいてr個のタンパク質濃度（P = 0.127）。 <img alt="図1" src="/files/ftp_upload/53476/53476fig1.jpg" /> 図1.ミルクcreamatocrit、脂肪濃度、及びエネルギー値 。ミルクサンプルは、妊娠中や授乳を通じてコン​​トロールにウィスターダムから離乳で収集した（n = 5）、高タンパク質（N = 5）、またはハイプレバイオティックファイバー（N = 4）食事ました。 Creamatocrit測定（A）は、乳脂肪濃度（B）及びエネルギー値（C）を計算するために使用した。 <a href="https://www-jove-com.remotexs.ntu.edu.sg/files/ftp_upload/53476/53476fig1large.jpg" target="_blank">この図の拡大版をご覧になるにはこちらをクリックしてください。</a> <img alt="図2" src="/files/ftp_upload/53476/53476fig2.jpg" /> 2.総乳タンパク質濃度を図 。ミルクサンプルは、収集しましたコントロール上のウィスターダムから離乳時編（n = 5）で、高タンパク質（N = 5）、またはハイプレバイオティックファイバー（N = 4）妊娠中や授乳を通して食事。総タンパク質濃度を、Bio-Rad DCタンパク質アッセイを用いて決定した。 <a href="https://www-jove-com.remotexs.ntu.edu.sg/files/ftp_upload/53476/53476fig2large.jpg" target="_blank">この図のより大きなバージョンを表示するにはここをクリックしてください。</a>

Watch this Scientific Journal Video about Milk Collection in the Rat Using Capillary Tubes and Estimation of Milk Fat Content by Creamatocrit at JoVE.com

Milk Collection in the Rat Using Capillary Tubes and Estimation of Milk Fat Content by Creamatocrit

Milk is a primary source of nutrition for the neonate. Analysis of milk components may provide insight into maternal factors that affect offspring health. This protocol describes a manual method of collecting milk samples from the lactating rat, which can then be used for further downstream analysis.

キャピラリーチューブ、Creamatocritによって乳脂肪含量の推定を用いたラットにおける牛乳コレクション

Milk, as the sole source of nutrition for the newborn mammal, provides the necessary nutrients and energy for offspring growth and development. It also ...

milk-collection-rat-using-capillary-tubes-estimation-milk-fat-content

Nanyang Technological University

Research

JoVE Journal

Biology

12.2K ビュー.  University of Calgary. Milk is a primary source of nutrition for the neonate. Analysis of milk components may provide insight into maternal factors that affect offspring health. This protocol describes a manual method of collecting milk samples from the lactating rat, which can then be used for further downstream analysis.

ビデオ: Milk Collection in the Rat Using Capillary Tubes and Estimation of Milk Fat Content by Creamatocrit

Implantation of Engineered Tissue in the Rat Heart

Rodent surgery is often an important component in assessing the utility of engineered tissues. A wide variety of surgical procedures can be performed in common laboratory rats or mice and these quite frequently serve as an intermediate step between bench-top experiments and large animal testing or human trials. Given that rodents provide an established, cost-effective, and physiologically-relevant model system in which to test novel combinations of scaffolding materials and cells, they are particularly well-suited for cardiovascular tissue engineering studies. Presently, we describe an open-heart surgical procedure to implant engineered tissue containing myogenic progenitor cells in the atrioventricular (AV) groove of a rat heart. These implants are intended to create an electrical conduit between the right atrium and right ventricle with the ultimate goal of providing an alternative treatment to conventional pacemaker implantation in pediatric patients with complete heart block[1]. The engineered tissue is implanted in the AV-groove by means of a thoracotomy. For our purposes, Lewis rats are anesthetized and invasively ventilated to maintain positive airway pressure during the sterile surgical procedure. The approach to the heart is performed by a right thoracotomy through an antero-lateral incision at the 5th intercostal space. The tissue construct is fixed in the AV groove using a single 7-0 Prolene suture and positioned between the right ventricle and atrium at the ventral portion of the heart. The epicardium is partially removed to allow direct contact between the recipient myocardial cells and those contained in the engineered tissue. Following implantation, the chest wall is closed in layers, any pneumothorax is evacuated, and the animal is extubated and treated with analgesic.

Here, we describe a cardiac surgical procedure to implant engineered tissue in the atrioventricular (AV)-groove of an adult Lewis rat.

ラット心臓における培養組織の移植

Rodent surgery is often an important component in assessing the utility of engineered tissues. A wide variety of surgical procedures can be performed in ...

生物学

A Neuronal and Astrocyte Co-Culture Assay for High Content Analysis of Neurotoxicity

High Content Analysis (HCA) assays combine cells and detection reagents with automated imaging and powerful image analysis algorithms, allowing measurement of multiple cellular phenotypes within a single assay. In this study, we utilized HCA to develop a novel assay for neurotoxicity. Neurotoxicity assessment represents an important part of drug safety evaluation, as well as being a significant focus of environmental protection efforts. Additionally, neurotoxicity is also a well-accepted in vitro marker of the development of neurodegenerative diseases such as Alzheimer's and Parkinson's diseases. Recently, the application of HCA to neuronal screening has been reported. By labeling neuronal cells with &beta;III-tubulin, HCA assays can provide high-throughput, non-subjective, quantitative measurements of parameters such as neuronal number, neurite count and neurite length, all of which can indicate neurotoxic effects. However, the role of astrocytes remains unexplored in these models. Astrocytes have an integral role in the maintenance of central nervous system (CNS) homeostasis, and are associated with both neuroprotection and neurodegradation when they are activated in response to toxic substances or disease states. GFAP is an intermediate filament protein expressed predominantly in the astrocytes of the CNS. Astrocytic activation (gliosis) leads to the upregulation of GFAP, commonly accompanied by astrocyte proliferation and hypertrophy. This process of reactive gliosis has been proposed as an early marker of damage to the nervous system. The traditional method for GFAP quantitation is by immunoassay. This approach is limited by an inability to provide information on cellular localization, morphology and cell number. We determined that HCA could be used to overcome these limitations and to simultaneously measure multiple features associated with gliosis - changes in GFAP expression, astrocyte hypertrophy, and astrocyte proliferation - within a single assay. In co-culture studies, astrocytes have been shown to protect neurons against several types of toxic insult and to critically influence neuronal survival. Recent studies have suggested that the use of astrocytes in an in vitro neurotoxicity test system may prove more relevant to human CNS structure and function than neuronal cells alone. Accordingly, we have developed an HCA assay for co-culture of neurons and astrocytes, comprised of protocols and validated, target-specific detection reagents for profiling &beta;III-tubulin and glial fibrillary acidic protein (GFAP). This assay enables simultaneous analysis of neurotoxicity, neurite outgrowth, gliosis, neuronal and astrocytic morphology and neuronal and astrocytic development in a wide variety of cellular models, representing a novel, non-subjective, high-throughput assay for neurotoxicity assessment. The assay holds great potential for enhanced detection of neurotoxicity and improved productivity in neuroscience research and drug discovery.

This article describes a novel protocol and reagent set designed for sensitive measurement of neurotoxic effects of compounds and treatments on co-cultures of neurons and astrocytes using high content analysis. Results demonstrate that high content analysis represents an exciting novel technology for neurotoxicity assessment.

神経毒性の高いコンテンツ分析のための神経とアストロサイト共培養アッセイ

High Content Analysis (HCA) assays combine cells and detection reagents with automated imaging and powerful image analysis algorithms, allowing ...

Imaging of Estrogen Receptor-&alpha; in Rat Pial Arterioles using a Digital Immunofluorescent Microscope

Many of estrogen's effects on vascular reactivity are mediated through interaction with estrogen receptors 1, 2, 3. Although two sub-types exist (estrogen receptor -&alpha; and &beta;),estrogen receptor-&alpha; has been identified in both the smooth muscle and in endothelial cells of pial arterial segments using fluorescent staining combined with confocal laser scanning microscopy 4. Furthermore, ER-&alpha; is located in the nuclei and in the cytoplasm of rat basilar arteries 5. The receptors are abundant and fluoresce brightly, but clear visualization of discrete groups of receptors is difficult likely due to the numbers located in many cell layers of pial vessel segments. Additionally, many reports using immunohistochemical techniques paired with confocal microscopy poorly detail the requirements critical for reproduction of experiments 6. Our purpose for this article is to describe a simple technique to optimize the staining and visualization of ER-&alpha; using cross-sectional slices of pial arterioles obtain from female rat brains. We first perfuse rats with Evans blue dye to easily identify surface pial arteries which we isolate under a dissecting microscope. Use of a cryostat to slice 8 &mu;m cross sections of the arteries allows us to obtain thin vessel sections so that different vessel planes are more clearly visualized. Cutting across the vessel rather than use of a small vessel segment has the advantage of easier viewing of the endothelial and smooth muscle layers. In addition, use of a digital immunofluorescent microscope with extended depth software produces clear images of ten to twelve different vessel planes and is less costly than use of a confocal laser scanning microscope.

Imaging of Estrogen Receptor-&#945; in Rat Pial Arterioles using a Digital Immunofluorescent Microscope

The goal of this article is to demonstrate a method to optimize immunofluorescent detection of estrogen receptor-&#945; (ER&#945;) in rat pial arterial slices using a digital immunofluorescent microscope.

デジタル免疫蛍光顕微鏡を用いたラット軟膜細動脈におけるエストロゲン受容体-αのイメージング

Many of estrogen's effects on vascular reactivity are mediated through interaction with estrogen receptors 1, 2, 3. Although two sub-types exist (estrogen ...

Isolation of Rat Portal Fibroblasts by In situ Liver Perfusion

Liver fibrosis is defined by the excessive deposition of extracellular matrix by activated myofibroblasts. There are multiple precursors of hepatic myofibroblasts, including hepatic stellate cells, portal fibroblasts and bone marrow derived fibroblasts 1. Hepatic stellate cells have been the best studied, but portal fibroblasts are increasingly recognized as important contributors to the myofibroblast pool, particularly in biliary fibrosis 2. Portal fibroblasts undergo proliferation in response to biliary epithelial injury, potentially playing a key role in the early stages of biliary scarring 3-5. A method of isolating portal fibroblasts would allow in vitro study of this cell population and lead to greater understanding of the role portal fibroblasts play in biliary fibrosis.
Portal fibroblasts have been isolated using various techniques including outgrowth 6, 7 and liver perfusion with enzymatic digestion followed by size selection 8. The advantage of the digestion and size selection technique compared to the outgrowth technique is that cells can be studied without the necessity of passage in culture. Here, we describe a modified version of the original technique described by Kruglov and Dranoff 8 for isolation of portal fibroblasts from rat liver that results in a relatively pure population of primary cells.

Isolation of Rat Portal Fibroblasts by In situ Liver Perfusion

A technique for isolating portal fibroblasts from rat liver is described. Livers are perfused and digested in situ with collagenase, followed by ex vivo digestion of the liver slurry and size selection of cells. This method provides a pure population of portal fibroblasts without the need for passage in culture.

ラットポータル線維芽細胞の分離により、<em&gt;その場</em&gt;肝灌流

Liver fibrosis is defined  by the excessive deposition of extracellular matrix by activated  myofibroblasts. There are multiple precursors of hepatic ...

Functional Imaging of Brown Fat in Mice with 18F-FDG micro-PET/CT

Brown adipose tissue (BAT) differs from white adipose tissue (WAT) by its discrete location and a brown-red color due to rich vascularization and high density of mitochondria. BAT plays a major role in energy expenditure and non-shivering thermogenesis in newborn mammals as well as the adults 1. BAT-mediated thermogenesis is highly regulated by the sympathetic nervous system, predominantly via &beta; adrenergic receptor 2, 3. Recent studies have shown that BAT activities in human adults are negatively correlated with body mass index (BMI) and other diabetic parameters 4-6. BAT has thus been proposed as a potential target for anti-obesity/anti-diabetes therapy focusing on modulation of energy balance 6-8. While several cold challenge-based positron emission tomography (PET) methods are established for detecting human BAT 9-13, there is essentially no standardized protocol for imaging and quantification of BAT in small animal models such as mice. Here we describe a robust PET/CT imaging method for functional assessment of BAT in mice. Briefly, adult C57BL/6J mice were cold treated under fasting conditions for a duration of 4 hours before they received one dose of 18F-Fluorodeoxyglucose (FDG). The mice were remained in the cold for one additional hour post FDG injection, and then scanned with a small animal-dedicated micro-PET/CT system. The acquired PET images were co-registered with the CT images for anatomical references and analyzed for FDG uptake in the interscapular BAT area to present BAT activity. This standardized cold-treatment and imaging protocol has been validated through testing BAT activities during pharmacological interventions, for example, the suppressed BAT activation by the treatment of &beta;-adrenoceptor antagonist propranolol 14, 15, or the enhanced BAT activation by &beta;3 agonist BRL37344 16. The method described here can be applied to screen for drugs/compounds that modulate BAT activity, or to identify genes/pathways that are involved in BAT development and regulation in various preclinical and basic studies.

Functional Imaging of Brown Fat in Mice with 18F-FDG micro-PET/CT

A method of functional imaging of mouse brown adipose tissue (BAT) is described in which cold-stimulated uptake of 18F-Fluorodeoxyglucose (FDG) in BAT is non-invasively assessed with a standardized micro-PET/CT protocol. This method is robust and sensitive to detect differences in BAT activities in mouse models.

FDG micro-PET/CTマウスにおける褐色脂肪の機能イメージング

Brown adipose tissue (BAT) differs from white adipose  tissue (WAT) by its discrete location and a brown-red color due to rich  vascularization and high ...

Milk Collection Methods for Mice and Reeves' Muntjac Deer

Animal models are commonly used throughout research laboratories to accomplish what would normally be considered impractical in a pathogen&#8217;s native host. Milk collection from animals allows scientists the opportunity to study many aspects of reproduction including vertical transmission, passive immunity, mammary gland biology, and lactation. Obtaining adequate volumes of milk for these studies is a challenging task, especially from small animal models. Here we illustrate an inexpensive and facile method for milk collection in mice and Reeves&#8217; muntjac deer that does not require specialized equipment or extensive training. This particular method requires two researchers: one to express the milk and to stabilize the animal, and one to collect the milk in an appropriate container from either a Muntjac or mouse model. The mouse model also requires the use of a P-200 pipetman and corresponding pipette tips. While this method is low cost and relatively easy to perform, researchers should be advised that anesthetizing the animal is required for optimal milk collection.

Milk collection from animal models facilitates various research avenues: understanding passive immunity, identifying pathogens responsible for vertical transmission and, through the use of transgenic mice, even commercial production of proteins found in human breast milk. Here we illustrate a simple method for milk collection in mice and Reeves&#8217; muntjac deer.

マウスおよびリーブス」キョン鹿のためのミルク収集方法

Animal models are commonly used throughout research laboratories to accomplish what would normally be considered impractical in a pathogen&#8217;s native ...

Collection and Analysis of Arabidopsis Phloem Exudates Using the EDTA-facilitated Method

The plant phloem is essential for the long-distance transport of (photo-) assimilates as well as of signals conveying biotic or abiotic stress. It contains sugars, amino acids, proteins, RNA, lipids and other metabolites. While there is a large interest in understanding the composition and function of the phloem, the role of many of these molecules and thus, their importance in plant development and stress response has yet to be determined. One barrier to phloem analysis lies in the fact that the phloem seals itself upon wounding. As a result, the number of plants from which phloem sap can be obtained is limited. One method that allows collection of phloem exudates from several plant species without added equipment is the EDTA-facilitated phloem exudate collection described here. While it is easy to use, it does lead to the wounding of cells and care has to be taken to remove contents of damaged cells. In addition, several controls to prove purity of the exudate are necessary. Because it is an exudation rather than a direct collection of the phloem sap (not possible in many species) only relative quantification of its contents can occur. The advantage of this method over others is that it can be used in many herbaceous or woody plant species (Perilla, Arabidopsis, poplar, etc.) and requires minimal equipment and training. It leads to reasonably large amounts of exudates that can be used for subsequent analysis of proteins, sugars, lipids, RNA, viruses and metabolites. It is simple enough that it can be used in both a research as well as in a teaching laboratory.

Collection and Analysis of Arabidopsis Phloem Exudates Using the EDTA-facilitated Method

Knowledge of the composition of the phloem sap as well as the mechanism of its loading and long-distance transport is essential for the understanding of long-distance signaling in plant development and stress/pathogen response and of assimilate transport. This manuscript describes the collection of phloem exudates using the EDTA-facilitated method.

の収集と分析<em&gt;シロイヌナズナ</em&gt;師部はEDTA-促進法を用いた滲出

The plant phloem is essential for the long-distance transport of (photo-) assimilates as well as of signals conveying biotic or abiotic stress. It ...

In Vivo 4-Dimensional Tracking of Hematopoietic Stem and Progenitor Cells in Adult Mouse Calvarial Bone Marrow

Through a delicate balance between quiescence and proliferation, self renewal and production of differentiated progeny, hematopoietic stem cells (HSCs) maintain the turnover of all mature blood cell lineages. The coordination of the complex signals leading to specific HSC fates relies upon the interaction between HSCs and the intricate bone marrow microenvironment, which is still poorly understood[1-2].
We describe how by combining a newly developed specimen holder for stable animal positioning with multi-step confocal and two-photon in vivo imaging techniques, it is possible to obtain high-resolution 3D stacks containing HSPCs and their surrounding niches and to monitor them over time through multi-point time-lapse imaging. High definition imaging allows detecting ex vivo labeled hematopoietic stem and progenitor cells (HSPCs) residing within the bone marrow. Moreover, multi-point time-lapse 3D imaging, obtained with faster acquisition settings, provides accurate information about HSPC movement and the reciprocal interactions between HSPCs and stroma cells.
Tracking of HSPCs in relation to GFP positive osteoblastic cells is shown as an exemplary application of this method. This technique can be utilized to track any appropriately labeled hematopoietic or stromal cell of interest within the mouse calvarium bone marrow space.

In Vivo 4-Dimensional Tracking of Hematopoietic Stem and Progenitor Cells in Adult Mouse Calvarial Bone Marrow

The nature of the interactions between hematopoietic stem and progenitor cells (HSPCs) and bone marrow niches is poorly understood. Custom hardware modifications and a multi-step acquisition protocol allow the use of two-photon and confocal microscopy to image ex vivo labeled HSPCs homed within bone marrow areas, tracking interactions and movement.

成体マウス頭蓋冠骨髄中の造血幹細胞および前駆細胞のin vivo 4次元トラッキングで

Through a delicate balance between quiescence and proliferation, self renewal and production of differentiated progeny, hematopoietic stem cells (HSCs) ...

Fecal Glucocorticoid Analysis: Non-invasive Adrenal Monitoring in Equids

Adrenal activity can be assessed in the equine species by analysis of feces for corticosterone metabolites. During a potentially aversive situation, corticotrophin releasing hormone (CRH) is released from the hypothalamus in the brain. This stimulates the release of adrenocorticotrophic hormone (ACTH) from the pituitary gland, which in turn stimulates release of glucocorticoids from the adrenal gland. In horses the glucocorticoid corticosterone is responsible for several adaptations needed to support equine flight behaviour and subsequent removal from the aversive situation. Corticosterone metabolites can be detected in the feces of horses and assessment offers a non-invasive option to evaluate long term patterns of adrenal activity. Fecal assessment offers advantages over other techniques that monitor adrenal activity including blood plasma and saliva analysis. The non-invasive nature of the method avoids sampling stress which can confound results. It also allows the opportunity for repeated sampling over time and is ideal for studies in free ranging horses. This protocol describes the enzyme linked immunoassay (EIA) used to assess feces for corticosterone, in addition to the associated biochemical validation.

Adrenal activity can be assessed in the equine species by analysis of feces for corticosterone metabolites. The method offers a non-invasive option to assess long term patterns in both domestic and free ranging horses. This protocol describes the enzyme linked immunoassay involved and the associated biochemical validation.

糞便グルココルチコイド分析：ウマにおける非侵襲性副腎モニタリング

Adrenal activity can be assessed in the equine species by analysis of feces for corticosterone metabolites. During a potentially aversive situation, ...

Avian Semen Collection by Cloacal Massage and Isolation of DNA from Sperm

Collection of semen may be useful for a wide range of applications including studies involving sperm quality, sperm telomere dynamics, and epigenetics. Birds are widely used subjects in biological research and are ideal for studies involving repeated sperm samples. However, few resources are currently available for those wishing to learn how to collect and extract DNA from avian sperm. Here we describe cloacal massage, a gentle, non-invasive manual technique for collecting avian sperm. Although this technique is established in the literature, it can be difficult to learn from the available descriptions. We also provide information for extracting DNA from avian semen using a commercial extraction kit with modifications. Cloacal massage can be easily used on any small- to medium-sized male bird in reproductive condition. Following collection, the semen can be used immediately for motility assays, or frozen for DNA extraction following the protocol described herein. This extraction protocol was refined for avian sperm and has been successfully used on samples collected from several passerine species (Passer domesticus, Spizella passerina, Haemorhous mexicanus, and Turdus migratorius) and one columbid (Columba livia).

This protocol describes cloacal massage, a non-invasive manual technique for collecting semen from birds, and DNA extraction from avian sperm using a commercial extraction kit with modifications.

排せつマッサージと精子から DNA の隔離による鳥の精液採取

Collection of semen may be useful for a wide range of applications including studies involving sperm quality, sperm telomere dynamics, and epigenetics. ...