Abstract:
:1,25-Dihydroxyvitamin D3 [1,25(OH)2D3] and all-trans retinoic acid (RA), the active metabolites of vitamins D and A respectively, regulate the proliferation and differentiation of keratinocytes. Both the vitamin D receptor (VDR) and the retinoic acid receptor family (RAR) bind to DNA response elements as heterodimers with the retinoic X receptor (RXR), suggesting that there are pathways of action that are shared by both compounds. Therefore, we examined the interactions of 1,25(OH)2D3 and RA upon the proliferation and differentiation of normal human keratinocytes (NHK) and of a squamous cell carcinoma cell line, SCC4. Although both 1,25(OH)2D3 and RA were each able to inhibit NHK proliferation in a dose-dependent manner, when they were administered in combination, proliferation was stimulated, suggesting mutual antagonism. In contrast, SCC4 cells proved insensitive in terms of proliferation to 1,25(OH)2D3 and to all but the highest concentration (10(-6) M) of RA. 1,25(OH)2D3 exerted a biphasic effect on transglutaminase (TGase) and involucrin (INV) mRNA levels, with maximal stimulation at 10(-9) M. RA inhibited TGase and INV mRNA levels and antagonized the stimulation by 1,25(OH)2D3. A similar pattern was observed for TGase protein, but, RA, which, by itself, reduced INV, markedly enhanced the ability of 1,25(OH)2D3 to raise INV levels, possibly by inhibiting 1,25(OH)2D3-stimulated TGase activity and cross-linking of soluble INV into the insoluble cornified envelope (CE). Thus, in NHK cells, RA antagonizes the antiproliferative prodifferentiating actions of 1,25(OH)2D3, but assessment of a single marker, such as INV protein, may be misleading.
journal_name
J Cell Physioljournal_title
Journal of cellular physiologyauthors
Gibson DF,Bikle DD,Harris Jdoi
10.1002/(SICI)1097-4652(199801)174:1<1::AID-JCP1>3subject
Has Abstractpub_date
1998-01-01 00:00:00pages
1-8issue
1eissn
0021-9541issn
1097-4652pii
10.1002/(SICI)1097-4652(199801)174:1<1::AID-JCP1>3journal_volume
174pub_type
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