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The renal stanniocalcin-1 gene is differentially regulated by hypertonicity and hypovolemia in the rat.

Abstract：

:Stanniocalcin-1 (STC-1) is made by kidney collecting duct cells for autocrine and paracrine targeting of nephron cell mitochondria. Here, the ligand stimulates respiratory uncoupling and calcium uniport activity. However, the underlying purpose of these actions and how the renal gene is regulated are poorly understood. In a previous study, we described the time-dependent, stimulatory effects of water deprivation on renal STC-1 mRNA levels in both rats and mice. In cortical kidney, STC-1 mRNA levels were increased 8-fold by 72h of water deprivation, whereas the gene response in outer and inner medulla was less pronounced (2-4 fold). Gene induction occurred equally in males and females and was accompanied by increased mitochondrial STC-1 protein levels. As water deprivation increases extracellular fluid (ECF) tonicity and at the same time reduces ECF volume, the present study examined the individual effects of hypertonicity and hypovolemia on renal gene activity in rats. Hypertonicity, whether induced by mannitol, glucose or NaCl, uniquely stimulated the cortical gene, to the extent that transcript levels were positively correlated with serum osmolality. This was in contrast to high dietary sodium, which had no bearing on cortical or medullary transcript levels. The situation was reversed in the case of hypovolemia. Inner medullary gene expression was uniquely induced by hypovolemia (low sodium diet or polyethylene glycol) such that transcript levels were positively correlated with hematocrit, while cortical gene activity was unaffected or reduced. Hence, the cortical and medullary genes proved to be differentially regulated by changing ECF tonicity and volume, respectively. The findings are therefore indicative of cortical and medullary STC-1 having separate roles in the renal control of ECF balance.

journal_name

Mol Cell Endocrinol

journal_title

Molecular and cellular endocrinology

authors

Turner J,Xiang FL,Feng Q,Wagner GF

doi

10.1016/j.mce.2010.09.010

subject

Has Abstract

pub_date

2011-01-01 00:00:00

pages

150-7

issue

eissn

0303-7207

issn

1872-8057

pii

S0303-7207(10)00471-5

journal_volume

331

pub_type

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The renal stanniocalcin-1 gene is differentially regulated by hypertonicity and hypovolemia in the rat.