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1,25-Dihydroxyvitamin D₃ and Its Analogues Down-Regulate Cell Invasion-associated Proteases in Cultured Malignant Cells¹

Departments of Virology [K. K., J. K-O.] and Pathology [J. K-O.], the Haartman Institute, University of Helsinki, FIN-00014 Helsinki, Finland

Abstract

Vitamin D and its derivatives (deltanoids) are potent regulators of cell proliferation and differentiation. Targeted production of proteolytic enzymes like serine proteases and metalloproteinases is an important part of the invasive process of cancer cells. Treatment with 125-dihydroxyvitamin D₃ [1,25(OH)₂D₃] decreases the invasive properties of breast carcinoma cells. Here we have analyzed the effects of 1,25(OH)₂D₃ and its synthetic analogues on the secretion and cell surface association of the components of the plasminogen activator (PA) system and on the secretion of certain matrix metalloproteinases (MMPs) and their inhibitors in MDA-MB-231 breast carcinoma cells. Deltanoids were able to decrease the secretion of urokinase PA and tissue-type PA activity in a dose-dependent manner and to increase PA inhibitor 1 secretion, leading to reduced total PA activity. CB1093 was the most potent analogue, effective at concentrations several logarithms lower than 1,25(OH)₂D₃. Transient transfection of different urokinase PA promoter reporter constructs to HT-1080 fibrosarcoma indicator cells indicated that vitamin D-responsive sequences were located between nucleotides -2350 and -1870 in the 5' region of the promoter. Treatment of MDA-MB-231 cells with 1,25(OH)₂D₃ or other deltanoids also resulted in decreased MMP-9 levels in association with increased tissue inhibitor of MMP 1 activity. Membrane-type 1-MMP expression or proteolytic processing were not appreciably affected by deltanoids. Vitamin D and its analogues caused a decrease in Matrigel invasion assays of MDA-MB-231 cells. Cancer cell invasion is associated with coordinated secretion of proteolytic enzymes and their inhibitors. Vitamin D and its derivatives can evidently influence invasive processes by two means: (a) decreasing the expression and activity of cell invasion-associated serine proteases and metalloproteinases; and (b) inducing their inhibitors.

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