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Science 1 March 1991:
Vol. 251. no. 4997, pp. 1078 - 1082
DOI: 10.1126/science.1847755
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Articles

Science, Vol 251, Issue 4997, 1078-1082
Copyright © 1991 by American Association for the Advancement of Science

articles

Cell cycle-dependent coupling of the calcitonin receptor to different G proteins

M Chakraborty, D Chatterjee, S Kellokumpu, H Rasmussen, and R Baron

Yale University School of Medicine, Department of Cell Biology, New Haven, CT 06510.

Calcitonin is a calcium regulating peptide hormone with binding sites in kidney and bone as well as in the central nervous system. The mechanisms of signal transduction by calcitonin receptors were studied in a pig kidney cell line where the hormone was found to regulate sodium pumps. Calcitonin receptors activated the cyclic adenosine monophosphate (cAMP) or the protein kinase C (PKC) pathways. The two transduction pathways required guanosine triphosphate (GTP)-binding proteins (G proteins) (the choleratoxin sensitive Gs and the pertussis toxin sensitive Gi, respectively) and led to opposite biological responses. Moreover, selective activation of one or the other pathway was cell cycle-dependent. Therefore, calcitonin may induce different biological responses in target cells depending on their positions in the cell cycle. Such a modulation of ligand-induced responses could be of importance in rapidly growing cell populations such as during embryogenesis, growth, and tumor formation.


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