title: Proteinase-activated receptor 2 modulates corticotropin releasing hormone-induced brain-derived neurotrophic factor release from microglial cells.
abstract: Brain-derived neurotrophic factor (BDNF) plays a critical role in the pathogenesis of neuropathic pain, but its regulation of BDNF release is not fully understood. To further understand the regulation of BDNF release, the microglial cell line, C8-D1A (microglia, in short), were cultured as a model. The levels of BDNF were determined by enzyme-linked immunoassay. Apoptotic microglia were assessed by flow cytometry. The protease-activated receptor 2 (PAR2) was activated by tryptase. Exposure to corticotripin releasing hormone (CRH) induced BDNF release from microglia. Apoptosis was evident in microglia after activation by CRH. Tryptase-induced PAR2 activation reduced the frequency of apoptosis of microglia, but enhanced the BDNF levels in the culture medium, which was partially blocked by PAR2 antagonists. We conclude that PAR2 agonists can promote the BDNF release from microglia; the PAR2 antagonists may be a potential therapeutic target to attenuate the BDNF-related neuropathic pain.
authors.affiliation: Department of Anesthesiology and Department of Pain Medicine, The Central Hospital of Wuhan, 26 Shengli St., Jiangan District, Wuhan, 430014, China.
authors.forename: Yongzhi
authors.initials: Y
authors.lastname: Fan
authors.forename: Jingli
authors.initials: J
authors.lastname: Chen
authors.forename: Jun
authors.initials: J
authors.lastname: Ye
authors.forename: Hong
authors.initials: H
authors.lastname: Yan
authors.forename: Yi
authors.initials: Y
authors.lastname: Cai
mesh_terms: D000818:Animals; D017209:Apoptosis / Q000187:drug effects*; D019208:Brain-Derived Neurotrophic Factor / Q000378:metabolism*; D002460:Cell Line; D003346:Corticotropin-Releasing Hormone / Q000494:pharmacology*; D051379:Mice; D017628:Microglia / Q000166:cytology / Q000378:metabolism; D044464:Receptor, PAR-2 / Q000819:agonists / Q000037:antagonists & inhibitors / Q000378:metabolism*; D051197:Toll-Like Receptor 4 / Q000378:metabolism; D053802:Tryptases / Q000378:metabolism
chemical_list: D019208:Brain-Derived Neurotrophic Factor; D044464:Receptor, PAR-2; C493487:Tlr4 protein, mouse; D051197:Toll-Like Receptor 4; D003346:Corticotropin-Releasing Hormone; D053802:Tryptases
keywords: apoptosis; brain-derived neurotropin factor; corticotropin releasing hormone; microglia; protease-activated receptor 2