Selenite and Ca2+ homeostasis in the rat lens: effect on Ca-ATPase and passive Ca2+ transport.

Abstract:

:Calcium permeability was significantly increased in lenses from rats 36 h following a single injection of a cataractogenic dose of sodium selenite (30 nmol/g body weight) and this permeability returned to control values by 72 h post-injection (PI). The greater Ca2+ permeability could be partially reversed by incubating lenses in medium containing 2 mM dithiothreitol (DTT). Estimations of Ca-ATPase activity revealed the greatest level occurred in the epithelial layer and that the nucleus had no detectable activity. By 48 h PI both Ca(2+)-pump activity and the Ca(2+)-dependent ATP hydrolytic activity were less compared to controls in membrane preparations from rat lenses. Only the hydrolytic activity could be partially restored by treatment with 5 mM DTT. Both permeability and active Ca2+ transport were affected by selenite in a manner that would lead to increased Ca2+ accumulation in lenses from rats treated with selenite. It is suggested that the oxidative damage that accompanies in vivo exposure to selenite could affect Ca2+ homeostasis in the lens by directly altering permeability and Ca-ATPase.

journal_name

Curr Eye Res

journal_title

Current eye research

authors

Wang Z,Bunce GE,Hess JL

doi

10.3109/02713689308999466

subject

Has Abstract

pub_date

1993-03-01 00:00:00

pages

213-8

issue

3

eissn

0271-3683

issn

1460-2202

journal_volume

12

pub_type

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