Angiotensin AT2 receptor activates the cyclic-AMP signaling pathway in eel |
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Authors: | Marty Kwok-Shing Wong Yoshio Takei |
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Affiliation: | Laboratory of Physiology, Department of Marine Biosciences, Atmosphere and Ocean Research Institute, The University of Tokyo, 5-1-5 Kashiwanoha, Chiba 277-8564, Japan |
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Abstract: | A unique angiotensin type 2 receptor (AT2) that induces a cAMP signaling pathway was cloned and characterized for the first time in fish, Anguilla japonica. Phylogeny and synteny results showed that the AT2s among fishes and tetrapods share the same origin despite a sub-cluster formation among eel, salmon, and zebrafish. The eel AT2 was expressed abundantly in the spleen and localized at straight arterioles and ellipsoid regions prior to the sinusoid, suggesting a role in the regulation of microcirculation and/or immune response. Various angiotensin (Ang) peptides, including Ang II, Ang III, and Ang IV, were detected in the spleen by a radioimmunoassay coupled with HPLC separation, and these endogenous peptides stimulated a cAMP signaling, which has no crosstalk with cGMP pathway. The common and contrasting features of AT2 between fishes and mammals imply some ancestral characters of AT2, which are important information for receptor binding and evolutionary studies. |
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Keywords: | ATIP, AT2 receptor interacting protein CRE, cAMP-responsive element DIG, digoxigenin GC, guanylyl cyclase GPCR, G-protein coupled receptor HEK293, human embryonic kidney cell line 293 KT5823, 2,3,9,10,11,12-hexahydro-10R-methoxy-2,9-dimethyl-1-oxo-9S,12R-epoxy-1H-diindolo[1,2,3-fg:3&prime ,2&prime ,1&prime -kl]pyrrolo[3,4-i][1,6]benzodiazocine-10-carboxylic acid, methyl ester MS-222, ethyl 3-aminobenzoate methanesulfonate ODQ, 1H-[1,2,4]oxadiazolo[4,3-a]quinoxalin-1-one PKA, protein kinase A PKC, protein kinase C PP2A, protein phosphatase 2 PTPase, protein tyrosine phosphatase RAS, renin angiotensin system SEAP, secreted alkaline phosphatase SHP-1, SH2 domain-containing phosphatase 1 |
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