Effects of bombesin antagonists on the growth of small cell lung cancer cells in vitro.

Abstract:

:Small cell lung cancer (SCLC) produces several neuroendocrine peptides, including gastrin-releasing peptide (GRP), the mammalian equivalent of bombesin. There is some evidence to support the suggestion that GRP is an autocrine regulator of SCLC growth. Therefore, we have tested the effect of bombesin and two antagonists of bombesin on SCLC cell growth in a serum-free liquid tissue culture system. The antagonists used were analogues of substance P: spantide and (D-Arg1, D-Pro2, D-Trp7,9, Leu11) substance P. The cell lines used in this study all produced GRP-related peptides and one line had demonstrable GRP receptors. Exogenous bombesin did not cause any stimulation of growth in the liquid culture assay. The bombesin antagonists inhibited SCLC cell growth, but apparently not via the bombesin receptor. The bombesin used was biologically active because it stimulated the proliferation of Swiss 3T3 fibroblasts. The antagonists caused inhibition of this bombesin-induced proliferation, which was reversed by addition of excess bombesin. In addition, the antagonists and substance P alone stimulated proliferation of 3T3 cells, indicating that they may interact with another growth factor receptor on 3T3 cells. We conclude that growth of SCLC cells is not dependent on bombesin under all in vitro culture conditions because bombesin failed to stimulate growth in liquid cultures and the growth inhibition caused by bombesin antagonists was probably not mediated by the bombesin receptor.

journal_name

Cancer Res

journal_title

Cancer research

authors

Layton JE,Scanlon DB,Soveny C,Morstyn G

subject

Has Abstract

pub_date

1988-09-01 00:00:00

pages

4783-9

issue

17

eissn

0008-5472

issn

1538-7445

journal_volume

48

pub_type

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