Abstract
The effects of a vasoactive intestinal peptide (VIP) receptor antagonist (VIPhyb) on human glioblastoma cells were characterized. Pituitary adenylate cyclase activating polypeptide (125I-PACAP-27) bound with high affinity to U87, U118, and U373 cells. Specific 125I-PACAP-27 binding to U87 cells was inhibited, with high affinity, by PACAP but not VIP or VIPhyb (IC50=10, 1500, and 500 nM, respectively). By reverse transcriptasepolymerase chain reaction (RT-PCR), a major 305bp band was observed indicative of PAC1 receptors. PACAP-27 caused cAMP elevation and the increase in cAMP caused by PACAP-27, was inhibited by the VIPhyb. Also, PACAP-27 caused cytosolic Ca2+ elevation in Fura-2AM loaded U87 cells and the VIPhyb inhibited this increase. Using the MTT growth assay, the VIPhyb was shown to inhibit glioblastoma growth in a concentration-dependent manner. Using a clonogenic assay in vitro, 10 µM VIPhyb significantly inhibited proliferation of U87, U118, and U373 cells. In vivo, 0.4 µg/kg VIPhyb inhibited U87 xenograft proliferation in nude mice. These results suggest that the VIPhyb antagonizes PAC1 receptors on glioblastoma cells and inhibits their proliferation.
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Sharma, A., Walters, J., Gozes, Y. et al. A vasoactive intestinal peptide antagonist inhibits the growth of glioblastoma cells. J Mol Neurosci 17, 331–339 (2001). https://doi.org/10.1385/JMN:17:3:331
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DOI: https://doi.org/10.1385/JMN:17:3:331