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Imperial Cancer Research Fund, P.O. Box 123, Lincoln's Inn Fields, London WC2A 3PX, United Kingdom
We tested whether Ca2+-mobilizing neuropeptides can function as growth factors for small cell lung carcinoma cells. The neuropeptides bradykinin, neurotensin, cholecystokinin, and vasopressin at nanomolar concentrations stimulated a rapid and transient increase in the intracellular concentration of Ca2+. Crucially, these peptides in the same concentration range also caused a marked increase in colony formation in semisolid medium in responsive small cell lung carcinoma cell lines. At optimal concentrations bradykinin, neurotensin, cholecystokinin, vasopressin, galanin, and gastrin-releasing peptide were equally effective in promoting clonal growth. These findings support the hypothesis that small cell lung carcinoma growth is sustained by an extensive network of autocrine and paracrine interactions involving multiple neuropeptides.
1 To whom requests for reprints should be addressed.
Received 3/28/91. Accepted 5/16/91.
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