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Cell membrane potential oscillations induced by kinins in fibroblasts expressing the Ha-ras oncogene.
- Source :
-
Agents and actions. Supplements [Agents Actions Suppl] 1992; Vol. 38 ( Pt 2), pp. 73-80. - Publication Year :
- 1992
-
Abstract
- In NIH-3T3 fibroblasts expressing the ras oncogene (+ras) bradykinin (BK) elicits sustained oscillations (1/min) of cell membrane potential (PD) due to oscillations of intracellular calcium activity with subsequent activation of calcium sensitive K+ channels. In NIH-3T3 fibroblasts not expressing the oncogene (-ras), BK leads to a single transient hyperpolarization of the cell membrane, not followed by oscillations. The oscillations of cell membrane potential require the presence of extracellular calcium and are abolished by K+ channel blocker barium (1 mmol/l), as well as by calcium channel blockers cadmium (1 mmol/l), lanthanum (0.1 mmol/l) and nifedipine (10 mumol/l). However, the oscillations are not modified by 1 mumol/l nifedipine, or by other calcium channel blockers, such as verapamil (10 mumol/l) or diltiazem (10 mumol/l). Cell proliferation is inhibited by nifedipine (10 mumol/l) but not by verapamil or diltiazem, indicating that the oscillations of intracellular calcium are a prerequisite for the growth factor independent proliferation of ras oncogene expressing cells.
- Subjects :
- 3T3 Cells
Animals
Barium pharmacology
Calcium pharmacology
Calcium Channel Blockers pharmacology
Cell Membrane drug effects
Fibroblasts physiology
Kinetics
Membrane Potentials drug effects
Mice
Transfection
Bradykinin pharmacology
Cell Membrane physiology
Cell Transformation, Neoplastic
Genes, ras
Subjects
Details
- Language :
- English
- ISSN :
- 0379-0363
- Volume :
- 38 ( Pt 2)
- Database :
- MEDLINE
- Journal :
- Agents and actions. Supplements
- Publication Type :
- Academic Journal
- Accession number :
- 1462847