Name: primary endodermal epithelial cell culture from the yolk sac membrane of japanese quail embryos
Uploaded: 2016-03-10T13:00:00
Description: Watch this Scientific Journal Video about Primary Endodermal Epithelial Cell Culture from the Yolk Sac Membrane of Japanese Quail Embryos at JoVE.com

Funding for the development of current protocol is particularly supported by &#8220;Aim for the Top University Plan&#8221; of the National Taiwan University, Taiwan (grant ID-104R350144), as well as the Ministry of Science and Technology of Taiwan (grant ID: MOST 104-2313-B-002-039-MY3). We especially thank the Center for Biotechnology of National Taiwan University for providing an animal room and laboratory space for the current study.

NOTE: This procedure is a modification of a chicken model culture protocol developed by Bauer et al. 2013 and Nakazawa et al., 2011. 2,9
1. Prepare Healthy Embryonic Day 5 Embryos from Japanese Quail
<ol>
	<li>Place 1 male and 3 female sexually mature Japanese quail together in the same cage. Supply feed and water ad libitum. Adjust the light in the animal room to 14 hr of light and 10 hr of darkness.</li>
	<li>Collect fertilized eggs in plastic bags eve...

<ol>
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Because the previous culture system has only limited success, a better culture system is needed. The Japanese quail YSM endoderm requires treatment with proteolytic enzymes such as collagenase to loosen the cell-cell junctions to achieve better growth performance in the ex-vivo explants. Our data show that cell numbers from partial digestion treatment were greater than from the undigested tissue culture after seeding for 2 days (Figure 1). Therefore, the partial proteolytic digestion is a critical step t...

The major nutritional resource of the avian embryo is yolk, composed of 33% lipids, 17% protein, and 1% ash.1 During embryonic development, the yolk sac membrane (YSM) grows from within the embryonic abdominal cavity and gradually covers the yolk surface. Beginning at embryonic day 2, gene expression associated with lipid metabolism and angiogenesis is gradually increased in YSM, and the YSM slowly develops villus-like projections.8,9 These projections increase absorption of yolk nutrients to support embryonic development. The YSM is an extraembryonic tissue that contains three germ layers, endoderm, mesoderm and ectoderm.14 The yolk sac ectoderm faces the albumen and links with the vitelline membrane to gently cover the yolk sac. The endodermal epithelial cells are faced directly toward the egg yolk and serve as nutrient utilization portals.6 As the YSM expands, endodermal epithelial cell (EECs) can be divided by shape and functionality into two groups, area vitelline and area vasculosa.7
Area vitelline is composed of endodermal cells and is distant from the embryo; area vasculosa is composed of mesodermal cells and covers differentiated EECs with blood vessels and connective tissues. By embryonic day 5, the yolk is totally covered by ectoderm and endoderm of YSM and the vascular area has grown rapidly. The YSM absorbs, recomposes and releases lipids (as yolk-derived very low density lipoprotein) and proteins into the embryonic circulatory system.9, 2 Therefore, we established a primary Japanese quail embryonic endodermal epithelial cell culture system, to study the mechanisms of lipid utilization in YSM during avian embryonic development.
Lipids such as triacylglycerol, lecithin, phospholipid and cholesterol ester (CE) are the primary energy sources for avian embryos. At the early stages of development, yolk lipids are composed of only 1.3% CE and it rises to 10-15% at mid-term of avian embryonic development 3, 11. Cholesterol ester is synthesized from cholesterol by sterol O-acyltransferase 1 (SOAT1) in avian embryo YSM.4
The storage form of cholesterol is CE, CE is carried in lipoproteins, and lipoproteins are transported by circulation to tissues.13 A week before hatch there is rapid growth of avian embryos. Approximately 68% of the remaining lipid contents in yolk are absorbed during this stage.10 The mechanism by which yolk lipids are utilized can be clarified by an EEC research model. A chicken EEC culture protocol was established to achieve this research goal.2, 9 However, due to the low success rate of tissue explants, an improved EEC cell culture procedure is needed to study the function of certain enzymes and proteins in mediating nutrient utilization by avian embryos during development.

<table border="0" cellpadding="0" cellspacing="0" width="845">
	<tbody>
		<tr height="50">
			<td height="50" style="height:50px;width:331px;">Dulbecco&#39;s Modified Eagle Medium</td>
			<td style="width:199px;">Gibco by Life technologies</td>
			<td style="width:148px;">12800-017 10 X 1 L</td>
			<td style="width:167px;">For wash the EECs pellets</td>
		</tr>
		<tr height="50">
			<td height="50" style="height:50px;width:331px;">D-MEM/F-12</td>
			<td style="width:199px;">Gibco by Life technologies</td>
			<td style="width:148px;">12400-024 10 X 1 L</td>
			<td>As the basal medium in culturing EECs</td>
		</tr>
		<tr height="50">
			<td height="50" style="height:50px;width:331px;">NBCS</td>
			<td style="width:199px;">Gibco by Life technologies</td>
			<td style="width:148px;">16010-159</td>
			<td>As the supplyment serum in culturing EECs</td>
		</tr>
		<tr height="50">
			<td height="50" style="height:50px;width:331px;">Pen-Strep Ampho. Solution</td>
			<td style="width:199px;">BI (Biological Industries)</td>
			<td style="width:148px;">03-033-1B 100ml</td>
			<td>For attenuating the possible infection&#160;</td>
		</tr>
		<tr height="50">
			<td height="50" style="height:50px;width:331px;">Collagenase Type IV</td>
			<td style="width:199px;">Gibco by Life technologies</td>
			<td style="width:148px;">17104-019 1g</td>
			<td>&#160;Collagenase is a protease with specificity for the bond between a neutral amino acid (X) and glycine in the sequence Pro-XGly-Pro. As the protease for dissociation of cells from primary tissue.</td>
		</tr>
		<tr height="30">
			<td height="30" style="height:30px;width:331px;">24 well plate</td>
			<td style="width:199px;">FALCON&#174;</td>
			<td style="width:148px;">REF-353047</td>
			<td>For EECs to attach and extension</td>
		</tr>
		<tr height="30">
			<td height="30" style="height:30px;width:331px;">50 ML PP centrifuge tubes</td>
			<td style="width:199px;">Corning&#174; CentriStarTM</td>
			<td style="width:148px;">430829</td>
			<td>For transportion of membranes and enzyme digestion</td>
		</tr>
		<tr height="25">
			<td height="25" style="height:25px;">50ML Conical bottomed Tube with Cap</td>
			<td style="width:199px;">PRO TECH</td>
			<td>CT-50-PL-TW</td>
			<td>For transportion of membranes and enzyme digestion</td>
		</tr>
		<tr height="25">
			<td height="25" style="height:25px;width:331px;">Reciprocal shaking bath</td>
			<td>DEAGLE</td>
			<td style="width:148px;">SB302</td>
			<td>For better enzymatic digestion on membranes</td>
		</tr>
	</tbody>
</table>

primary endodermal epithelial cell culture from the yolk sac membrane of japanese quail embryos

We established an endodermal epithelial cell culture model (EEC) for studying the function of certain enzymes and proteins in mediating nutrient utilization by avian embryos during development. Fertilized Japanese quail eggs were incubated at 37 &#176;C for 5 days and then yolk sac membranes (YSM) were collected to establish the EEC culture system. We isolated the embryonic endoderm layer from YSM, and sliced the membrane into 2 - 3 mm pieces and partially digested with collagenase before seeding in 24-well culture plates. The EECs proliferate out of the tissue and are ready for cell culture studies. We found that the EECs had typical characteristics of YSM in vivo, for example, accumulation of lipid droplets, expression of sterol O-acyltransferase and lipoprotein lipase. The partial digestion treatment significantly increased the successful rate of EEC culture. Utilizing the EECs, we demonstrated that the expression of SOAT1 was regulated by the cAMP dependent protein kinase A related pathway. This primary Japanese quail EEC culture system is a useful tool to study embryonic lipid transportation and to clarify the role of genes involved in mediating nutrient utilization in YSM during avian embryonic development.

In order to achieve the goal of establishing a consistent and useful cell model, we need to extend and stabilize the proliferation rate and performance of avian EECs. We compared direct incubation of the endoderm with no enzyme digestion with endoderm partially digested with proteolytic enzymes, such as collagenase or collagenase plus 0.6 U of dispase. Dispase is an amino-endopeptidase that hydrolyzes the N-terminal peptide bonds of non-polar amino acid residues. Whereas protease digestio...

Watch this Scientific Journal Video about Primary Endodermal Epithelial Cell Culture from the Yolk Sac Membrane of Japanese Quail Embryos at JoVE.com

Primary Endodermal Epithelial Cell Culture from the Yolk Sac Membrane of Japanese Quail Embryos

To study the mechanism of lipid utilization in yolk sac membranes during the late stages of avian embryonic development, we established a primary Japanese quail embryonic endodermal epithelial cell culture system.

We established an endodermal epithelial cell culture model (EEC) for studying the function of certain enzymes and proteins in mediating nutrient ...

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