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7000 IU vitamin D was not enough to reduce obese tissue – Jan 2013

Investigations of the Anti-inflammatory Effects of Vitamin D in Adipose Tissue: Results from an In Vitro Study and a Randomized Controlled Trial.

Horm Metab Res. 2013 Jan 15.
Wamberg L, Cullberg KB, Rejnmark L, Richelsen B, Pedersen SB.
Department of Endocrinology and Internal Medicine MEA, Aarhus University Hospital, Aarhus, Denmark.

Inflammation is a key feature of obesity and type 2 diabetes. The active vitamin D metabolite, 1,25-dihydroxyvitamin D [1,25(OH)2D], modulates the inflammation in vitro. We studied whether inflammation in adipose tissue (AT) cultures could be reduced by incubation with 1,25(OH)2D in vitro, or by oral treatment with vitamin D in vivo in obese subjects with low plasma levels of 25-hydroxyvitamin D. Samples of subcutaneous AT were stimulated with IL-1β to induce inflammation. In the in vitro study, samples were concomitantly incubated with or without 1,25(OH)2D, and analyzed for mRNA and protein levels of inflammatory markers IL-6, IL-8, and MCP-1.

In the in vivo study, samples of subcutaneous AT from obese subjects obtained before and after treatment with 7 000 IU of vitamin D daily or placebo in a randomized controlled trial were stimulated with IL-1β. The samples were analyzed for AT gene expression and compared with plasma markers of inflammation. In the in vitro study, concomitant incubation with 1,25(OH)2D reduced mRNA levels of MCP-1 by 45% (p=0.01), of IL-6 by 32% (p=0.002), and of IL-8 by 34% (p=0.03), and reduced secretion of IL-8 protein by 18% (p=0.005). In vivo treatment with vitamin D did not reduce AT expression or circulating levels of MCP-1, IL-6, or IL-8. 1,25(OH)2D has significant anti-inflammatory effects in AT in vitro. However, a similar reduction in AT and systemic inflammation cannot be obtained by oral treatment with vitamin D in obese subjects.

© Georg Thieme Verlag KG Stuttgart · New York.

PMID: 23322512

The abstract fails to say how long the vitamin D treatment lasted.
It takes many months for vitamin D levels to normalize in people who are deficient

See also VitaminDWiki