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Integrins are cell-surface receptors engaged in important cancer invasion processes, such as adhesion, migration, proliferation and differentiation. The aim of this study was to evaluate the effect of 1,25-dihydroxyvitamin D3 (calcitriol) and its metabolite 1,24-dihydroxyvitamin D3 (PRI-2191) on alphavbeta3 integrin expression in various cancer cell lines. The expression levels of the beta3 and alphav integrins were reduced only in the WEHI-3 and LLC cell lines by the two compounds. Calcitriol or PRI-2191 treatment caused differentiation of WEHI-3 mouse leukemia cells, but apoptosis of LLC cells. WEHI-3 and LLC cells exposed to calcitriol or PRI-2191 lost their migratory and adhesive potentials. The inhibition of migratory potential was higher in the LLC cells than in the WEHI-3 cells and appeared to correlate with the increased down-regulation of alphavbeta3 integrin by calcitriol or PRI-2191. The observed in vivo effects (antitumor and antimetastatic) in mice bearing subcutaneously transplanted LLC cancer are possibly associated with inhibited migratory potential as a consequence of the lowered integrin expression caused by calcitriol or PRI-2191.

The influence of 1,25-dihydroxyvitamin D3 and 1,24-dihydroxyvitamin D3 on v 3 integrin expression in cancer cell lines