alexa From vitamin D to hormone D: fundamentals of the vitamin D endocrine system essential for good health.
Infectious Diseases

Infectious Diseases

Journal of AIDS & Clinical Research

Author(s): Norman AW, Norman AW

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Abstract New knowledge of the biological and clinical importance of the steroid hormone 1alpha,25-dihydroxyvitamin D(3) [1alpha,25(OH)(2)D(3)] and its receptor, the vitamin D receptor (VDR), has resulted in significant contributions to good bone health. However, worldwide reports have highlighted a variety of vitamin D insufficiency and deficiency diseases. Despite many publications and scientific meetings reporting advances in vitamin D science, a disturbing realization is growing that the newer scientific and clinical knowledge is not being translated into better human health. Over the past several decades, the biological sphere of influence of vitamin D(3), as defined by the tissue distribution of the VDR, has broadened at least 9-fold from the target organs required for calcium homeostasis (intestine, bone, kidney, and parathyroid). Now, research has shown that the pluripotent steroid hormone 1alpha,25(OH)(2)D(3) initiates the physiologic responses of >/=36 cell types that possess the VDR. In addition to the kidney's endocrine production of circulating 1alpha,25(OH)(2)D(3,) researchers have found a paracrine production of this steroid hormone in >/=10 extrarenal organs. This article identifies the fundamentals of the vitamin D endocrine system, including its potential for contributions to good health in 5 physiologic arenas in which investigators have clearly documented new biological actions of 1alpha,25(OH)(2)D(3) through the VDR. As a consequence, the nutritional guidelines for vitamin D(3) intake (defined by serum hydroxyvitamin D(3) concentrations) should be reevaluated, taking into account the contributions to good health that all 36 VDR target organs can provide.
This article was published in Am J Clin Nutr and referenced in Journal of AIDS & Clinical Research

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