1 Alpha,25-dihydroxyvitamin D3 and its TX527 analog inhibit the growth of endothelial cells transformed by Kaposi sarcoma-associated herpes virus G protein-coupled receptor in vitro and in vivo

Endocrinology
Verónica Gonzalez-PardoRicardo Boland

Abstract

The Kaposi sarcoma-associated herpes virus-G protein-coupled receptor is a key molecule in the pathogenesis of Kaposi sarcoma, playing a central role in promoting vascular endothelial growth factor-driven angiogenesis and spindle cell proliferation. We studied the effects of 1 alpha,25-dihydroxyvitamin D(3) [1 alpha,25(OH)(2)D(3)] and the analog TX527 on the proliferation of endothelial cells (SVECs) and SVECs transformed by the viral G protein-coupled receptor (SVEC-vGPCR). 1 alpha,25(OH)(2)D(3) and TX527 decreased SVEC-vGPCR and SVEC numbers, the response being time dependent and similar in both cell lines. Vitamin D receptor (VDR) levels increased on treatment with 10 nm 1 alpha,25(OH)(2)D(3) or 1 nm TX527 in a time-dependent manner (1.5-24 h) in SVECs and SVEC-vGPCR. Basal VDR levels were increased in SVEC-vGPCR. The antiproliferative effects were accompanied by reduction in cyclin D1 and accumulation of p27 in SVECs but not SVEC-vGPCR. Induction of VDR was blocked by transfection of short hairpin RNA against VDR in SVEC-vGPCR and the antiproliferative effects of 1 alpha,25(OH)(2)D(3) and TX527 were decreased, involving the VDR genomic pathway in the hormone and analog mechanism of action. In vivo experiments showed that 1 ...Continue Reading

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Citations

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Apr 29, 2014·International Journal of Infectious Diseases : IJID : Official Publication of the International Society for Infectious Diseases·Kristine M ErlandsonThomas B Campbell
Apr 29, 2014·Frontiers in Physiology·Carlien LeyssensAnnemieke Verstuyf
Jul 28, 2012·Pulmonary Circulation·Harm J BogaardNorbert F Voelkel
Jan 5, 2011·Nature Reviews. Drug Discovery·Rosamaria Lappano, Marcello Maggiolini
Feb 22, 2017·Laboratory Investigation; a Journal of Technical Methods and Pathology·Andrzej T SlominskiCraig A Elmets

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