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A Novel Method: Super-selective Adrenal Venous Sampling

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ClC-2 Contributes to Hypotonicity-Induced Adrenal Aldosterone Secretion.

Marina Volkert¹, Hoang An Dinh^1,2, Ute I Scholl^1,3

¹Center of Genomic Medicine, Berlin Institute of Health at Charité-Universitätsmedizin Berlin, Berlin, Germany.

Acta Physiologica (Oxford, England)

|January 29, 2026

Summary

The chloride channel ClC-2 is essential for the adrenal zona glomerulosa to respond to low osmolality by releasing chloride, which regulates aldosterone production and electrolyte balance.

Keywords:

adrenal gland aldosterone chloride chloride channel osmoregulation

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Area of Science:

Endocrinology
Renal Physiology
Molecular Biology

Background:

The adrenal zona glomerulosa (ZG) controls blood pressure and electrolyte balance via aldosterone.
Potassium and Angiotensin II (Ang II) stimulate aldosterone through calcium oscillations.
Serum osmolality influences aldosterone production, but the underlying proteins are unknown.

Purpose of the Study:

To investigate the role of the chloride channel ClC-2 in ZG osmoregulation.
To determine if ClC-2 mediates the effects of hypoosmolality on aldosterone production.

Main Methods:

Utilized Clcn2 knockout (KO) and wild-type (WT) mice.
Measured aldosterone production in adrenal glands exposed to varying osmolality.
Employed calcium and chloride imaging in acute adrenal slices.
Induced systemic hypoosmolality in mice using desmopressin.

Main Results:

WT adrenals showed increased aldosterone under hypoosmolality; this was absent in KO mice.
Hypoosmolality elevated intracellular calcium in WT ZG cells, but not in KO cells.
KO ZG cells exhibited higher intracellular chloride, indicating ClC-2 facilitates chloride efflux.

Conclusions:

ClC-2 is crucial for the ZG response to hypoosmolality via chloride outflow.
This chloride efflux likely leads to depolarization, calcium influx, and aldosterone synthesis.
Findings enhance understanding of aldosterone production regulation.