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. 1999 Dec 8;82(1):124–130. doi: 10.1054/bjoc.1998.0888

Bombesin family receptor and ligand gene expression in human colorectal cancer and normal mucosa

H S Chave 1, A C Gough 1, K Palmer 1, S R Preston 2, J N Primrose 1
PMCID: PMC2363183  PMID: 10638978

Abstract

Bombesin-like peptides and their receptors are widely distributed throughout the gut and are potential mitogens for a number of gastrointestinal (GI) cancers. We have analysed the expression of bombesin-like peptides and their receptor subtypes in normal and neoplastic colorectal tissue. Expression was analysed by reverse transcription polymerase chain reaction (RT-PCR) using receptor and ligand subtype-specific primers and then expression localized by in situ hybridization (ISH) with riboprobes synthesized by in vitro transcription of cloned PCR products. Colorectal cancer tissue and matched normal mucosa from 23 patients were studied. Two of these patients had synchronous adenomatous polyps and two had synchronous hepatic metastases which were also studied. An additional two patients with adenomatous polyps were studied along with matched normal mucosa. Gastrin releasing peptide (GRP) receptor and ligand expression was present in all samples but with overall greater expression in the tumour samples. Neuromedin B (NMB) receptor expression was not detectable. NMB ligand was detected in all but one mucosal sample with overall overexpression in the tumour samples. Bombesin receptor subtype 3 (BRS-3) receptor expression was not detectable. These data support the possibility that GRP may be an autocrine growth factor in colorectal cancer. © 2000 Cancer Research Campaign

Keywords: colorectal cancer, bombesin, gastrin releasing peptide, neuromedin B, reverse transcription polymerase chain reaction, in situ hybridization

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Selected References

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