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Role of the vitamin D3 pathway in healthy and diseased skin--facts, contradictions and hypotheses.

Abstract：

:Irradiation of human keratinocytes with UVB (280-320 nm) in vitro and in vivo activates the metabolism of 7-dehydrocholesterol to hormonally active calcitriol. The production of calcitriol in the skin strongly depends on the photosynthesis of vitamin D(3) which is biologically inactive in the first instance. Vitamin D(3) serves as the starting substrate for two subsequent enzymatic hydroxylation steps in epidermal keratinocytes. Both the amount of vitamin D(3) and the activity of anabolic and catabolic vitamin D hydroxylases determine the cutaneous level of calcitriol. The hormonally active metabolite of vitamin D(3) regulates a huge number of genes in keratinocytes, and thus acts in an autocrine and/or paracrine manner. This local pathway of vitamin D(3) is unique, but its relevance for healthy and diseased skin is widely unknown, yet. Experimental findings implicate several questions: (1) Is UVB-induced formation of calcitriol involved in regulation of growth and differentaition of epidermal cells as well as immunological and skin protective processes? (2) What endogenous and exogenous factors including drugs affect the cutaneous vitamin D(3) pathway? From a therapeutical point of view, it has been known for a long time that topical application of calcitriol and its analogs can improve hyperproliferative skin diseases like psoriasis. In spite of many encouraging studies in recent years, the fields of the routinely therapeutical application of calcitriol or vitamin D analogs in dermatology (e.g. treatment of immunological, inflammatory, malignancies and infectious skin diseases) have not been intensified. Why is that?

journal_name

Exp Dermatol

journal_title

Experimental dermatology

authors

Lehmann B

doi

10.1111/j.1600-0625.2008.00810.x

subject

Has Abstract

pub_date

2009-02-01 00:00:00

pages

97-108

issue

2

eissn

0906-6705

issn

1600-0625

pii

EXD810

journal_volume

18

pub_type

杂志文章,评审

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