Induction of renin release from isolated glomeruli by inorganic mercury(II).

Abstract:

:Mercury(II) ions are known to accumulate in the kidney and their effect upon the renin-angiotensin system has also been described. The question, however, whether mercury(II) also exerts direct effect on the juxtaglomerular cells (JGC) to induce renin release remained to be answered. Suspension of isolated glomeruli was used to measure the mercury(II)-induced renin release in vitro. The glomeruli were isolated from female BALBc mice. HgCl2 was found to be capable of inducing renin release directly from JGC. The effect is concentration-dependent (P < 0.05, r = 0.914 and P < 0.01, r = 0.982, with and without Neutral Red vital staining) and becomes apparent already at a mercury(II) ion concentration as low as 1 microM. The renin-releasing effect of the mercury ion is to be inhibited by dithiothreitol (DTT) (renin activity 20.37 vs. 2.60 ng/ml.h in supernatant) as well as the elevated osmotic concentration of the incubating bath medium (20.37 vs. 6.84 ng/ml.h). This suggests that certain membrane sulfhydryl groups are implicated in the process on the one hand, and it is also in accordance with the known sensitivity of the renin granules to osmotic pressure on the other hand. Light and electron micrographs also demonstrate the direct, effective role of Hg(II) in the renin release process. Therefore, it is assumed that apart from its influence on tubulo-glomerular feedback a direct way of action of mercury(II) on renin release must also be taken into account.

journal_name

Toxicol Lett

journal_title

Toxicology letters

authors

Kozma L,Lenkey A,Varga E,Gomba S

doi

10.1016/0378-4274(96)03637-5

subject

Has Abstract

pub_date

1996-04-01 00:00:00

pages

49-54

issue

1

eissn

0378-4274

issn

1879-3169

pii

0378-4274(96)03637-5

journal_volume

85

pub_type

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