{'fraction_non_alphanumeric': 0.02920443101711984, 'fraction_numerical': 0.03121852970795569, 'mean_word_length': 5.671140939597316, 'pattern_counts': {'":': 0, '<': 0, '<?xml version=': 0, '>': 0, 'https://': 0, 'lorem ipsum': 0, 'www.': 0, 'xml': 0}, 'pii_count': 0, 'substrings_counts': 0, 'word_list_counts': {'cursed_substrings.json': 0, 'profanity_word_list.json': 0, 'sexual_word_list.json': 0, 'zh_pornsignals.json': 0}}
Vitamin D: a calciotropic hormone regulating calcium-induced keratinocyte differentiation.

BACKGROUND
Most biologically active forms of vitamin D3 (1,25(OH)2D3) and its analogs have functions and therapeutic potential that extend beyond those of regulating bone mineralization and intestinal calcium transport.


OBJECTIVE
We attempt to provide the rationale for the effectiveness of 1,25(OH)2D3 and its analogs in dermatology.


METHODS
The recent literature on the mechanisms of action of 1,25(OH)2D3 were reviewed.


RESULTS
1,25(OH)2D3 affects keratinocyte differentiation partly through its regulation of epidermal responsiveness to calcium. Calcium and 1,25(OH)2D3 interact in transcription of the genes required for differentiation and in the stability of the mRNAs produced from such genes.


CONCLUSION
An understanding of these mechanisms provides a rationale for treatment of various skin diseases with 1,25(OH)2D3 and its analogs and directs development of more effective therapy.