title: Differential expression and function of PACAP and VIP receptors in four human colonic adenocarcinoma cell lines.
abstract: Human colonic adenocarcinoma cell lines have conserved several features of the native tissue. Among these is the expression of cell surface receptors for hormones and neurotransmitters that may be involved in the regulation of proliferation and differentiation processes in these cancer cells. Here, we confirm that high-affinity binding sites for the Vasoactive Intestinal Polypeptide (VIP) and for the VIP analogue Pituitary Adenylate-Cyclase Activating Polypeptide (PACAP), were expressed in 4 human colonic adenocarcinoma cell lines, HT29, SW403, DLD-1 and Caco-2, that spontaneously displayed variable phenotypic properties in culture. We demonstrated that after long-term treatments, VIP and PACAP significantly reduced cell proliferation in the 4 cell lines and modulated intracellular cAMP and cGMP levels. Furthermore, conspicuous differences were observed from one cell type to another concerning expression of the receptor subsets or the effects of the neuropeptides on cell growth and on cyclic nucleotides production.
authors.affiliation: Laboratoire de Biologie des Interactions Cellulaires, CNRS UMR 6558, Université de Poitiers, Faculté des Sciences, France.
authors.forename: V
authors.initials: V
authors.lastname: Lelièvre
authors.forename: A C
authors.initials: AC
authors.lastname: Meunier
authors.forename: E
authors.initials: E
authors.lastname: Caigneaux
authors.forename: J
authors.initials: J
authors.lastname: Falcon
authors.forename: J M
authors.initials: JM
authors.lastname: Muller
mesh_terms: D000230:Adenocarcinoma; D018938:Caco-2 Cells; D002455:Cell Division / Q000187:drug effects; D003110:Colonic Neoplasms; D000242:Cyclic AMP / Q000378:metabolism; D006152:Cyclic GMP / Q000378:metabolism; D006131:Growth Inhibitors / Q000378:metabolism / Q000494:pharmacology; D019073:HT29 Cells; D006801:Humans; D009479:Neuropeptides / Q000378:metabolism / Q000494:pharmacology; D051219:Pituitary Adenylate Cyclase-Activating Polypeptide; D051236:Receptors, Pituitary Adenylate Cyclase-Activating Polypeptide; D011979:Receptors, Pituitary Hormone / Q000096:biosynthesis / Q000378:metabolism*; D018005:Receptors, Vasoactive Intestinal Peptide / Q000096:biosynthesis / Q000378:metabolism*; D014407:Tumor Cells, Cultured; D014660:Vasoactive Intestinal Peptide / Q000378:metabolism / Q000494:pharmacology
chemical_list: C495401:ADCYAP1 protein, human; D006131:Growth Inhibitors; D009479:Neuropeptides; D051219:Pituitary Adenylate Cyclase-Activating Polypeptide; D051236:Receptors, Pituitary Adenylate Cyclase-Activating Polypeptide; D011979:Receptors, Pituitary Hormone; D018005:Receptors, Vasoactive Intestinal Peptide; D014660:Vasoactive Intestinal Peptide; D000242:Cyclic AMP; D006152:Cyclic GMP