Vitamin D is a steroid hormone and a component of a complex endocrine pathway sometimes called 'vitamin D endocrine system' (Medscape, 2012). Despite treatment with renin—angiotensin—aldosterone system (RAAS) inhibitors, patients with diabetes have increased risk of progressive renal failure that correlates with albuminuria.281 patients with type 2 diabetes and albuminuria who were receiving angiotensin-converting enzyme inhibitors or angiotensin receptor blockers were enrolled in this study.
Patients were assigned to receive 24 weeks' treatment with:
- placebo
- 1 μg/day paricalcitol
- 2 μg/day paricalcitol
Paricalcitol (trade name Zemplar, Abbott Laboratories) is an analog of calcitriol, the active form of vitamin D.
The primary endpoint was the percentage change in mean urinary albumin-to-creatinine ratio (UACR).
The change in urinary albumin-to-creatinine ratio (UACR) was: −14% in the 1 μg paricalcitol group, and −20% in the 2 μg paricalcitol group.
The addition of 2 μg/day paricalcitol to RAAS inhibition safely lowers albuminuria in patients with diabetic nephropathy, and could be a novel approach to lower renal risk in diabetes.
References:
Selective vitamin D receptor activation with paricalcitol for reduction of albuminuria in patients with type 2 diabetes (VITAL study): a randomised controlled trial. The Lancet, Volume 376, Issue 9752, Pages 1543 - 1551, 6 November 2010.
Image source: Paricalcitol, Wikipedia, public domain.
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Unknown - Monday, June 23, 2014
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