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Endothelium-derived steroidogenic factor enhances angiotensin II-stimulated aldosterone release by bovine zona glomerulosa cells. Endocrinology 2007 Jan;148(1):317-23 PMID: 17053027

Pubmed ID

17053027

Abstract

Endothelium-derived steroidogenic factor (EDSF) is an endothelial peptide that stimulates aldosterone release from bovine adrenal zona glomerulosa (ZG) cells. The regulation of aldosterone release by combinations of EDSF and angiotensin II (AII) or EDSF and ACTH was investigated. Endothelial cells (ECs) and EC-conditioned media (ECCM) increased aldosterone release from ZG cells, an activity attributed to EDSF. AII (10(-12) to 10(-8) M) and ACTH (10(-12) to 10(-9) M) also stimulated the release of aldosterone from ZG cells. The stimulation by AII, but not ACTH, was greatly enhanced when ZG cells were coincubated with ECs. AII was metabolized by ECs to peptides identified by mass spectrometry as angiotensin (1-7) and angiotensin IV. There was very little metabolism of AII by ZG cells. Neither of these two AII metabolites altered aldosterone release from ZG cells, so they could not account for the enhanced response with ECs. AII-induced aldosterone release from ZG cells was enhanced by ECCM but not cell-free conditioned medium. This enhanced response was not due to increased EDSF release from ECs by AII. The synergistic effect of EDSF and AII was apparent when AII was added during or after the generation of ECCM and not observed when the AII component of the enhancement was blocked by the AII antagonist, losartan. These studies indicate that EDSF enhances the steroidogenic effect of AII. In the adrenal gland, ECs are in close anatomical relationship with ZG cells and may sensitize ZG cells to the steroidogenic action of AII by releasing EDSF.

Author List

Hanke CJ, Holmes BB, Xu Y, Nithipatikom K, Campbell WB

Authors

William B. Campbell PhD Chair, Professor in the Pharmacology and Toxicology department at Medical College of Wisconsin
Craig J. Hanke PhD Assistant Dean, Associate Professor in the Medical School Regional Campuses department at Medical College of Wisconsin




Scopus

2-s2.0-33845914377   5 Citations

MESH terms used to index this publication - Major topics in bold

Adrenocorticotropic Hormone
Aldosterone
Angiotensin I
Angiotensin II
Animals
Cattle
Cells, Cultured
Culture Media, Conditioned
Endothelium
Iodine Radioisotopes
Peptide Fragments
Peptides
Vasoconstrictor Agents
Zona Glomerulosa
jenkins-FCD Prod-353 9ccd8489072cb19f5b9f808bb23ed672c582f41e