1,25-Dihydroxyvitamin D(3) is a negative endocrine regulator of the renin-angiotensin system.
Level 5 - mechanism / opinion, no new human data
Bench and animal research (mouse models and in vitro cell culture)
PubMed 12122115 · doi:10.1172/JCI15219
What was done
The authors investigated the molecular mechanism linking vitamin D and the renin-angiotensin system using vitamin D receptor-null (VDR-null) mice, wild-type mice treated with 1,25-dihydroxyvitamin D(3) [1,25(OH)(2)D(3)] or synthesis inhibitors, and in vitro cell cultures.
What was found
Renin expression and plasma angiotensin II production were increased severalfold in VDR-null mice, resulting in hypertension, cardiac hypertrophy, and increased water intake, while salt- and volume-sensing controls remained intact. In wild-type mice, inhibiting 1,25(OH)(2)D(3) synthesis increased renin expression, whereas 1,25(OH)(2)D(3) injection suppressed it. In cell cultures, 1,25(OH)(2)D(3) suppressed renin transcription via a VDR-mediated mechanism independent of calcium metabolism. Exact numerical values were not reported in the abstract.
Why it matters
This study identifies active vitamin D as a direct negative endocrine regulator of renin gene expression, providing a mechanistic explanation for observed clinical links between low vitamin D and hypertension.
Limits
The study is restricted to animal models and in vitro cell assays without human clinical testing. Sample sizes, quantitative blood pressure values, and exact fold changes are not reported in the abstract.
Cited by
- supports Vitamin D functions as an endocrine repressor of the renin-angiotensin system by downregulating renin gene expression.