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Immunocytochemical demonstration of vasopressin binding in rat kidney [see comments]

JM Fadool and SK Aggarwal

Department of Zoology, Michigan State University, East Lansing 48824.

We investigated the immunoperoxidase demonstration of vasopressin (VSP) bound to paraffin-embedded sections of rat kidney and the effects of various fixatives. Slices of rat kidney from normal and 4-day water- deprived rats were incubated with 10(-7) M VSP, fixed, and embedded in paraffin. Hydrated sections of these tissues were again incubated with 10(-7) M VSP or 10(-7) M VSP and 10(-5) M oxytocin (OXY). VSP bound to the sections was demonstrated using rabbit anti-Arg8 VSP antiserum and peroxidase-labeled second antibody. In sections of kidney from both normal and water-deprived rats, immunoperoxidase labeling was most intense in the renal papilla and was restricted to the cells of the ducts of Bellini and loops of Henle. In the medulla, the collecting ducts and medullary thick ascending limbs of Henle were moderately stained. In the normal kidney sections there was no staining of the proximal tubules, distal convoluted tubules (DCT), and only slight staining of the cortical collecting ducts (CCD). However, in the water- deprived rats there was a considerable increase in the staining of the DCT and CCD. Simultaneous incubation in OXY and VSP resulted in reduced immunoperoxidase labeling of the tubules. Omission of VSP incubation led to a similar decrease in stain intensity, indicating a specificity for the sites of VSP binding. This technique allows the identification of cells responsible for the binding of VSP in the kidney.

Volume 38, Issue 1, pp. 7-12, 01/01/1990
Copyright © 1990 by The Histochemical Society


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[Abstract] [Full Text]



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