PMID: 9541123Apr 16, 1998Paper

Regulation of gp330/megalin expression by vitamins A and D

European Journal of Clinical Investigation
W LiuP Hellman

Abstract

A membrane-bound 550-kD Ca2+-binding glycoprotein belonging to the low-density lipoprotein (LDL) receptor superfamily has recently been identified as a putative calcium-sensing molecule. This molecule, known as gp330/megalin, is among several tissues present in the proximal tubule, parathyroid and placental cytotrophoblasts, in which a Ca2+-sensing function has been demonstrated. Regulation of mRNA and protein expression of gp330/megalin were studied in a recently established cell line derived from rat kidney proximal tubule cells (IRPTCs), in human JEG-3 cells and in the mouse embryonal carcinoma cell line F9. In IRPTCs, quantification of mRNA and protein expression demonstrated two- to five-fold increases after addition of 10(-6) mol L(-1) all-trans-retinoic acid, 9-cis-retinoic acid or 1,25-dihydroxyvitamin D3, alone or in combination. Similarly, an increase in gp330/megalin mRNA expression was seen in JEG-3 cells cultured with vitamin D and retinoids, as well as when F9 cells were differentiated by incubation with retinoic acid and cAMP. The IRPTCs were immortalized by viral infection with the SV40 genome preceded by a temperature-sensitive promoter. Thus, by culture of the cells at 41 degrees C, SV40 genome transcription i...Continue Reading

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