Key result
Old ovariectomized rats show reduced aldosterone secretion versus young rats, driven by lower synthase activity.
Why the study?
Clinical reports have revealed impaired sodium and water balance in elderly persons, prompting investigation into the effects and mechanisms of aging on aldosterone secretion in zona glomerulosa cells.
Does aging impair aldosterone secretion in zona glomerulosa cells of ovariectomized rats?
Population
Young (3 months) and old (24 months) female ovariectomized rats
Comparison
Old vs young rats and various pharmacological stimuli
Design
Preclinical ex vivo and in vitro comparative study
Authors
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Caution against clinical extrapolation in postmenopausal patients; leaves open human translation of age-related aldosterone impairment.
Does aging impair aldosterone secretion in zona glomerulosa cells of ovariectomized rats?
The age-related decline in aldosterone secretion in rats is partly due to reduced activities of biosynthetic enzymes, adenylyl cyclase, and L-type calcium channels.
Kau et al. (1999) studied this question. Old ovariectomized rats exhibited significantly reduced plasma aldosterone, basal and stimulated aldosterone secretion, lower aldosterone synthase activity, and decreased P450scc expression compared t.
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