Renomedullary interstitial cells: a target for endocrine and paracrine actions of vasoactive peptides in the renal medulla.

Abstract:

:1. The renal medulla plays an important role in regulating body sodium and fluid balance and blood pressure homeostasis through its unique structural relationships and interactions between renomedullary interstitial cells (RMIC), renal tubules and medullary vasculature. 2. Several endocrine and/or paracrine factors, including angiotensin (Ang)II, endothelin (ET), bradykinin (BK), atrial natriuretic peptide (ANP) and vasopressin (AVP), are implicated in the regulation of renal medullary function and blood pressure by acting on RMIC, tubules and medullary blood vessels. 3. Renomedullary interstitial cells express multiple vasoactive peptide receptors (AT1, ETA, ETB, BK B2, NPRA and NPRB and V1a) in culture and in tissue. 4. In cultured RMIC, AngII, ET, BK, ANP and AVP act on their respective receptors to induce various cellular responses, including contraction, prostaglandin synthesis, cell proliferation and/or extracellular matrix synthesis. 5. Infusion of vasoactive peptides or their antagonists systemically or directly into the medullary interstitium modulates medullary blood flow, sodium excretion and urine osmolarity. 6. Overall, expression of multiple vasoactive peptide receptors in RMIC, which respond to various vasoactive peptides and paracrine factors in vitro and in vivo, supports the hypothesis that RMIC may be an important paracrine target of various vasoactive peptides in the regulation of renal medullary function and long-term blood pressure homeostasis.

authors

Zhuo JL

doi

10.1046/j.1440-1681.2000.03277.x

keywords:

subject

Has Abstract

pub_date

2000-07-01 00:00:00

pages

465-73

issue

7

eissn

0305-1870

issn

1440-1681

journal_volume

27

pub_type

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