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Adrenal cortex hypoxia modulates aldosterone production in heart failure
Kaoru Yamashita1, Kentaro Ito2, Jin Endo3
1Department of Endocrinology and Hypertension, Tokyo Women's Medical University, Tokyo, Japan.
Biochemical and Biophysical Research Communications
|January 27, 2020
Summary
Heart failure increases aldosterone, even with treatment. Hypoxia in adrenal cells boosts aldosterone production by affecting cholesterol processing and catecholamine response, independent of the renin-angiotensin system.
Area of Science:
- Cardiovascular Medicine
- Endocrinology
- Molecular Biology
Background:
- Plasma aldosterone concentration rises with heart failure severity, persisting despite renin-angiotensin system inhibitor therapy.
- This suggests alternative aldosterone regulation pathways are crucial in heart failure pathogenesis.
Purpose of the Study:
- To investigate non-renin-angiotensin system-dependent mechanisms regulating aldosterone production in heart failure.
- To elucidate the role of hypoxia and β3-adrenergic receptors in aldosterone synthesis within zona glomerulosa cells.
Main Methods:
- Utilized Dahl salt-sensitive rats on a high-salt diet as a heart failure model.
- Employed H295R cells (human adrenocortical cell line) to study hypoxia-induced effects.
- Investigated the involvement of β3-adrenergic receptors, hormone-sensitive lipase, and cholesterol ester metabolism.
Main Results:
- Hypoxia induced β3-adrenergic receptor expression in zona glomerulosa cells and H295R cells.
- Hypoxia-mediated β3-adrenergic receptor activation enhanced aldosterone production via ERK-dependent hormone-sensitive lipase phosphorylation, promoting lipid droplet hydrolysis.
- Hypoxia accelerated cholesterol ester synthesis, increasing lipid droplet cholesterol ester content.
Conclusions:
- Hypoxic zona glomerulosa cells in heart failure exhibit enhanced aldosterone production.
- This enhancement is mediated by increased catecholamine responsiveness via β3-adrenergic receptors and activated cholesterol trafficking.
- These mechanisms operate independently of the renin-angiotensin system, offering potential therapeutic targets.
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