Enhancement by histamine of vascular endothelial growth factor production in granulation tissue via H2 receptors
- 1 December 2001
- journal article
- Published by Wiley in British Journal of Pharmacology
- Vol. 134 (7), 1419-1428
- https://doi.org/10.1038/sj.bjp.0704372
Abstract
1. Roles of histamine in the production of vascular endothelial growth factor (VEGF) in the carrageenin-induced granulation tissue in rats were analysed in vitro and in vivo. 2. Incubation of the minced granulation tissue in the presence of histamine (1 and 10 microM) increased the content of VEGF protein in the conditioned medium in a time- and concentration-dependent manner. The levels of VEGF mRNA in the minced granulation tissue were also increased by histamine in a concentration-dependent manner. 3. The increase in the content of VEGF protein in the conditioned medium by histamine (10 microM) was suppressed by the H(2) receptor antagonist cimetidine (IC(50) 0.37 microM), but not by the H(1) receptor antagonist pyrilamine maleate, the H(3) receptor antagonist thioperamide or the cyclo-oxygenase inhibitor indomethacin. 4. The histamine-induced increase in the content of VEGF protein in the conditioned medium was inhibited by the cyclic AMP antagonist Rp-cAMP (IC(50) 6.8 microM), and the protein kinase A inhibitor H-89 (IC(50) 12.5 microM), but not by the protein kinase C inhibitors Ro 31-8425 and calphostin C or the tyrosine kinase inhibitor genistein. 5. Simultaneous injection of cimetidine (400 microg) and indomethacin (100 microg) into the air pouch of rats additively reduced the carrageenin-induced increase in VEGF protein levels and angiogenesis in the granulation tissue as assessed by using carmine dye. 6. These findings indicate that histamine has an activity to induce VEGF production in the granulation tissue via the H(2) receptor-cyclic AMP-protein kinase A pathway and augments angiogenesis in the granulation tissue.Keywords
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