University at Buffalo - The State University of New York
Skip to Content
Effects of inositol trisphosphate on calcium mobilization in bone cells. - PubMed - NCBI
Format

Send to

Choose Destination
See comment in PubMed Commons below
Calcif Tissue Int. 1991 Nov;49(5):333-9.

Effects of inositol trisphosphate on calcium mobilization in bone cells.

Author information

1
Department of Oral Biology, School of Dental Medicine, State University of New York, Buffalo 14214.

Abstract

The effect of inositol 1,4,5 trisphosphate (IP3) on calcium mobilization was studied in human osteosarcoma lines, Saos-2 and G292, as well as isolated rat osteoblastic and osteoclastic cells. Cells were permeabilized with saponin and calcium mobilization was studied with the fluorescent dye, fura-2 in a recording spectrofluorometer. IP3 (10 microM) increased calcium release in all cell types studied. The effect was dependent on ATP and occurred in the presence of mitochondrial inhibitors. The effect was not seen with inositol 1-phosphate (IP) or inositol 1,4-diphosphate (IP2). Inositol 1,3,4,5 tetrakisphosphate (IP4) appeared to elicit a decrease in the calcium released. Depletion of the intracellular pool with the calcium ionophore, ionomycin, as well as incubation with the inhibitor of intracellular calcium mobilization, TMB-8, obliterated the IP3 effect. The results are consistent with the hypothesis that increases in IP3 can cause a rapid elevation of bone cell cytosolic calcium.

PMID:
1782574
[Indexed for MEDLINE]
PubMed Commons home

PubMed Commons

0 comments
How to join PubMed Commons

    Supplemental Content

    Loading ...
    Support Center