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Journal of Clinical Endocrinology & Metabolism, Vol 67, 576-583, Copyright © 1988 by Endocrine Society

ARTICLES

Gastrin-releasing peptide gene-associated peptides are expressed in normal human fetal lung and small cell lung cancer: a novel peptide family found in man

F Cuttitta, J Fedorko, JA Gu, AM Lebacq-Verheyden, RI Linnoila and JF Battey
Uniformed Services University of the Health Sciences, Department of Defense, Bethesda, Maryland.

Mammalian gastrin-releasing peptide (GRP) is found in cells of neuroendocrine and neural origin, and GRP mediates a variety of physiological and trophic responses when it binds to high affinity cell surface receptors on effector cells. Analysis of cDNA clones derived from prepro-GRP mRNAs predict the concurrent expression of a unique series of peptide hormones, the GRP gene-associated peptides (GGAPs). Alternative RNA splicing of the primary GRP gene transcript results in mRNAs that could encode 3 distinct forms of GGAPs. Using specific antisera directed against synthetic peptides representing portions of the predicted GGAPs, we found multiple GGAP forms in the endocrine cells of human fetal lung and in human small cell lung cancer cells (SCLC). Within a single pulmonary endocrine cell, at least 2 of these 3 predicted forms could be demonstrated using immunohistochemical techniques. In addition, concordant expression of GRP and GGAPs was found in 10 SCLC cell lines and 3 human SCLC tumors. These findings establish GGAPs as a novel peptide family in man and warrant further investigation into their potential role in normal and malignant growth.


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