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The effect of vitamin D pertinent to cardiovascular health on the heart itself is considered to shift toward an anti-inflammatory response in chronic heart failure (CHF); however, its underlying mechanism is not completely understood. In this study, we demonstrated that plasma 25(OH)D level, negatively associated with NT-ProBNP, correlated with the decreased Treg in CHF compared to the patients with other cardiovascular diseases and healthy and older donors. Naïve Treg cell (CD4 + CD45RA + Foxp3 lo T) subset, rather than whole Treg cells, contributes to the reduction of Treg in CHF. 1,25(OH)2D treatment maintained partial expression of CD45RA on CD4 + T cell after  α CD3/CD28 monoclonal antibodies activation and ameliorated the impaired CD4 + CD45RA + T cell function from CHF patients through upregulating Foxp3 expression and IL-10 secretion  in vitro . Low level of vitamin D receptor (VDR) was detected in CD4 + CD45RA + T cell of CHF than control, while 1,25(OH)2D treatment increased the VDR expression to exert its immunosuppression on T cell. The results of this study might provide tangible evidence to our knowledge of the impact of vitamin D supplementation on naïve Tregs, which may offer new means of preventing and treating CHF.

journal of immunology research

Vitamin D Deficiency Contributes to the Reduction and Impaired Function of Naïve<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" id="M1"><mml:mrow><mml:msup><mml:mrow><mml:mtext>CD45RA</mml:mtext></mml:mrow><mml:mrow><mml:mtext mathvariant="bold">+</mml:mtext></mml:mrow></mml:msup></mml:mrow></mml:math>Regulatory T Cell in Chronic Heart Failure

Vitamin D Deficiency Contributes to the Reduction and Impaired Function of NaïveCD45RA+Regulatory T Cell in Chronic Heart Failure