Name: culturing primary rat inner medullary collecting duct cells
Uploaded: 2013-06-21T14:00:00
Description: Watch this Scientific Journal Video about Culturing Primary Rat Inner Medullary Collecting Duct Cells at JoVE.com

This work was supported by the Deutsche Forschungsgemeinschaft (DFG; KL 1415/3-2 and KL 1415/4-2).

1. Preparation
<ol>
	<li>Preparing the culture dishes
	<ol>
		<li>Thaw Collagen Type IV O/N at 4 &deg;C and dissolve it in 0.1% sterile acetic acid. The volume to use depends on the type and number of dishes in which the cells are to be seeded. Use 2 &mu;g/cm2.</li>
		<li>Incubate dishes at least for 1 hr at RT and wash twice with distilled water (A. tridest).</li>
		<li>Allow the dishes to dry properly.</li>
	</ol>
	</li>
	<li>Supplementation of medium
	<ol>
		<li>Increase the glucose level up to 4.5 g/L by...

<ol>
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A., et al. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Angiotensin+II+stimulates+renin+in+inner+medullary+collecting+duct+cells+via+protein+kinase+C+and+independent+of+epithelial+sodium+channel+and+mineralocorticoid+receptor+activity.">Angiotensin II stimulates renin in inner medullary collecting duct cells via protein kinase C and independent of epithelial sodium channel and mineralocorticoid receptor activity.</a> Hypertension. 57, 594-599 (2011).</li><li>Chou, C. L., et al. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Regulation+of+aquaporin-2+trafficking+by+vasopressin+in+the+renal+collecting+duct.+Roles+of+ryanodine-sensitive+Ca2++stores+and+calmodulin.">Regulation of aquaporin-2 trafficking by vasopressin in the renal collecting duct. Roles of ryanodine-sensitive Ca2+ stores and calmodulin.</a> The Journal of Biological Chemistry. 275, 36839-36846 (2000).</li><li>Uawithya, P., Pisitkun, T., Ruttenberg, B. E., Knepper, M. 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We present a detailed protocol for the preparation and culturing of primary rat IMCD cells. The approach yields up to 21 cm2 of cells from one rat20. The experiment requires standard cell culture equipment and can be carried out by a single person within approximately 6 hr. Therefore, this approach is suitable as a standard laboratory method.
Primary rat IMCD cells can be seeded in culture dishes of different size, ranging from 96 well plates to 60 mm dishes. However, for...

A correction was made to <a href="http://www.jove.com/video/50366">Culturing Primary Rat Inner Medullary Collecting Duct Cells</a>. There was an error with an author's name. The author's last name had a typo and was corrected to: Enno Klussmann instead of: Enno Klussman

A correction to author list has been made for article Culturing Primary Rat Inner Medullary Collecting Duct Cells.

Erratum: Culturing Primary Rat Inner Medullary Collecting Duct Cells

In renal collecting duct principal cells, arginine-vasopressin (AVP) controls water reabsorption by stimulating the insertion of the water channel aquaporin-2 (AQP2) into the plasma membrane. AVP binds to the G protein-coupled vasopressin type-2 receptor (V2R) stimulating adenylyl cyclase and thereby cAMP formation. Initiation of this signaling cascade leads to activation of protein kinase A (PKA). PKA phosphorylates AQP2 at serine 256 (S256), which is the key trigger for its redistribution from intracellular vesicles into the plasma membrane. The membrane insertion facilitates water reabsorption along an osmotic gradient and fine-tunes body water homeostasis.
Dysregulation of AVP-mediated water reabsorption, due to aberrations of AVP secretion or AVP-activated signaling causes or is associated with severe diseases. Decreased water reabsorption caused by mutations of V2R or AQP2 leads to nephrogenic diabetes insipidus, whereas an elevated blood plasma AVP level is associated with excessive water reabsorption in cardiovascular diseases such as chronic heart failure and the syndrome of inappropriate antidiuretic hormone secretion (SIADH).
The significance of AVP-mediated water reabsorption stems not only from its implication in disease. The AVP-induced translocation of AQP2-bearing vesicles to and fusion with the plasma membrane represents a strictly cAMP-dependent exocytic process, which is currently not well understood. Other examples for a cAMP-dependent exocytosis are renin secretion in the kidney and H+ secretion in the stomach. Therefore, elucidation of molecular mechanisms governing the AQP2-translocation in renal principal cells not only helps to understand similar molecular processes in other cell types but may also pave the way to novel therapies for the treatment of diseases associated with disturbances of AVP-mediated water reabsorption.
Elucidating mechanisms controlling AQP2 requires collecting duct principal cell models. For this a number of different mammalian kidney cell lines are available. However, these models have several drawbacks. In many cell systems the protein level of AQP2 is low (Table 1; M1, HEK293, COS-7, MDCK, LLC-PK1)1-10, others ectopically overexpress human (MCD4, WT10)11,12 or rat (CD8)13 AQP2. In MCD4 and COS-7 cells the V2 receptor is not expressed. To our knowledge there is no permanent cell line as a model available, which is derived from the renal inner medullary collecting duct, that part of the kidney where AQP2 expression is most abundant, but from the cortical collecting duct1,11,13-16. Such cell models are for example the widely used immortalized mpkCCD (e.g.17) or the recently established mTERT-CCD14 cell lines. Both cell lines endogenously express AQP2 and V2R but since they are derived from the cortical collecting duct most likely contain a different proteome compared to inner medullary collecting duct (IMCD) cells. They must for example express different Na+ transport systems.
Here, we present a protocol to culture primary IMCD cells expressing V2R and AQP2 endogenously. This model, therefore, represents most closely the physiological situation in the renal collecting duct. As establishing the culture requires only standard laboratory equipment other laboratories can easily adopt this approach.

<table border="1">
	<tbody>
		<tr>
			<td>Name </td>
			<td>Company Catalog</td>
			<td>Number</td>
		</tr>
		<tr>
			<td>Collagen Type IV Mouse</td>
			<td>BD Biosciences</td>
			<td>356233</td>
		</tr>
		<tr>
			<td>Hyaluronidase</td>
			<td>SIGMA</td>
			<td>H6254</td>
		</tr>
		<tr>
			<td>Collagenase type CLS-II</td>
			<td>Biochrom AG</td>
			<td>C2-22</td>
		</tr>
		<tr>
			<td>DMEM + GlutMAX</td>
			<td>Invitrogen GIBCO</td>
			<td>21885108</td>
		</tr>
		<tr>
			<td>Nystatin</td>
			<td>SIGMA</td>
			<td>N4014</td>
		</tr>
		<tr>
			<td>Ultroser G</td>
			<td>Cytogen</td>
			<td>15950-017</td>
		</tr>
		<tr>
			<td>Non essential amino acids (NEA)</td>
			<td>Biochrom AG</td>
			<td>K0293</td>
		</tr>
		<tr>
			<td>Gentamicin</td>
			<td>Invitrogen GIBCO</td>
			<td>15710</td>
		</tr>
		<tr>
			<td>DBcAMP</td>
			<td>BIOLOG</td>
			<td>D009</td>
		</tr>
	</tbody>
</table>

culturing primary rat inner medullary collecting duct cells

Arginine-vasopressin (AVP) facilitates water reabsorption by renal collecting duct principal cells and thereby fine-tunes body water homeostasis. AVP binds to vasopressin V2 receptors (V2R) on the surface of the cells and thereby induces synthesis of cAMP. This stimulates cellular signaling processes leading to changes in the phosphorylation of the water channel aquaporin-2 (AQP2). Protein kinase A phoshorylates AQP2 and thereby triggers the translocation of AQP2 from intracellular vesicles into the plasma membrane facilitating water reabsorption from primary urine. Aberrations of AVP release from the pituitary or AVP-activated signaling in principal cells can cause central or nephrogenic diabetes insipidus, respectively; an elevated blood plasma AVP level is associated with cardiovascular diseases such as chronic heart failure and the syndrome of inappropriate antidiuretic hormone secretion.
Here, we present a protocol for cultivation of primary rat inner medullary collecting duct (IMCD) cells, which express V2R and AQP2 endogenously. The cells are suitable for elucidating molecular mechanisms underlying the control of AQP2 and thus to discover novel drug targets for the treatment of diseases associated with dysregulation of AVP-mediated water reabsorption. IMCD cells are obtained from rat renal inner medullae and are used for experiments six to eight days after seeding. IMCD cells can be cultured in regular cell culture dishes, flasks and micro-titer plates of different formats, the procedure only requires a few hours, and is appropriate for standard cell culture laboratories.

The successful cultivation of primary rat IMCD cells will result in a confluent monolayer 6-8 days after seeding (Figure 2). Per 60 mm culture dish there are approximately 6 x 106 cells. The cells tightly adhere to the culture dishes, as these were coated with collagen type IV, a basement membrane component18. Therefore, IMCD cells will not detach even during several thorough washing procedures. Up to 80% of the cultured cells express endogenously V2R and AQP2. These are the princip...

Watch this Scientific Journal Video about Culturing Primary Rat Inner Medullary Collecting Duct Cells at JoVE.com

Culturing Primary Rat Inner Medullary Collecting Duct Cells

Arginine-vasopressin (AVP) controls fine-tuning of body water homeostasis through facilitating water reabsorption by renal principal cells. Here, we present a protocol for the cultivation of primary rat inner medullary collecting duct cells suitable for the elucidation of molecular mechanisms underlying AVP-mediated water reabsorption.

Arginine-vasopressin (AVP) facilitates water reabsorption by renal collecting duct principal cells and thereby fine-tunes body water homeostasis. AVP ...

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