Regulation of aldosterone secretion by Cav1.3

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Catherine B Xie1, Lalarukh Haris Shaikh1, Sumedha Garg1

  • 1Clinical Pharmacology Unit, University of Cambridge, Box 110, Addenbrooke's Hospital, Cambridge, CB2 2QQ, UK.

Scientific Reports
|April 22, 2016
PubMed

Insights

A novel L-type calcium channel (LTCC) CaV1.3 antagonist, compound 8, effectively reduced aldosterone production in human adrenal cells. This suggests selective CaV1.3 blockade as a targeted therapy for primary hyperaldosteronism.

Area of Science:

  • Endocrinology
  • Pharmacology
  • Cell Biology

Background:

  • Aldosterone-producing adenomas (APAs) exhibit diverse phenotypes and genotypes.
  • Zona glomerulosa (ZG)-like APAs often possess mutations in the L-type calcium channel (LTCC) CaV1.3.

Purpose of the Study:

  • To investigate the role of CaV1.3 in steroidogenesis using a novel CaV1.3 antagonist, compound 8.
  • To compare the efficacy of compound 8 with nifedipine, a drug with selectivity for CaV1.2 over CaV1.3.

Main Methods:

  • Utilized the human adrenocortical H295R cell line and primary human adrenal cells.
  • Compared a novel CaV1.3 antagonist (compound 8) with nifedipine in cell-based assays.
  • Assessed aldosterone production in cells expressing wild-type or mutant CaV1.3 channels.

Main Results:

  • H295R cells with mutant CaV1.3 channels produced higher aldosterone levels, which were reduced by compound 8.
  • Compound 8 decreased aldosterone production in primary adrenal cells and non-transfected H295R cells, similar to high-dose nifedipine.
  • Nifedipine demonstrated 4.5-fold selectivity for CaV1.2 over CaV1.3.

Conclusions:

  • Selective CaV1.3 blockade presents a potential therapeutic strategy for primary hyperaldosteronism.
  • Targeting CaV1.3 offers a treatment approach for ZG-like APAs with CaV1.3 mutations, potentially avoiding vascular side effects associated with CaV1.2 blockade.

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