1 alpha,25-dihydroxyvitamin D3-induced changes in intracellular pH in osteoblast-like cells modulate gene expression

UMMS Affiliation

Department of Cell Biology

Publication Date


Document Type



Aminoquinolines; Animals; Calcitriol; Calcium; Gene Expression; Hydrogen-Ion Concentration; Osteoblasts; Osteocalcin; Osteopontin; Osteosarcoma; RNA, Messenger; Rats; Sialoglycoproteins; Tumor Cells, Cultured


Cell Biology


1 alpha,25-Dihydroxyvitamin D3 exerts rapid nongenomic effects on rat osteoblast-like cells independent of the classic nuclear receptor. These effects include changes in phospholipid metabolism and cell calcium. Intracellular calcium itself has been proposed to regulate intracellular pH in osteoblast cell lines. The purpose of this study was to determine the effect of 1 alpha,25-dihydroxyvitamin D3 on intracellular pH, the relationship of changes in calcium to changes in pH, and the role of pH changes in genomic activation. 1 alpha,25-Dihydroxyvitamin D3 increased intracellular pH within 10 min in rat osteoblast-like cells, an effect that was inhibited by removal of extracellular sodium and by the biologically inactive epimer 1 beta,25-dihydroxyvitamin D3. The hormone increased intracellular calcium in Quin 2 loaded cells in the presence and absence of extracellular sodium. The 1 alpha,25-dihydroxyvitamin D3-induced increments in osteocalcin and osteopontin mRNA levels were abolished in sodium-free medium. The results indicate that 1 alpha,25-dihydroxyvitamin D3-induced increments in cellular calcium precede cell alkalinization and that these changes in intracellular pH may modulate steady-state mRNA levels of genes induced by vitamin D.

DOI of Published Version



J Cell Biochem. 1993 Nov;53(3):234-9. Link to article on publisher's site

Journal/Book/Conference Title

Journal of cellular biochemistry

Related Resources

Link to Article in PubMed

PubMed ID