Abstract
Effects of pertussis toxin (PT) treatment on atrial natriuretic peptide (ANP)-mediated inhibition of adenylate cyclase and amylase release were investigated in rat parotid gland. Adenylate cyclase activity stimulated by GTPγS in PT-treated membranes was much larger than that in normal membranes. ANP dose-dependently inhibited adenylate cyclase stimulated by GTPγS in control rat parotid membranes, however in membranes prepared from PT-injected (in vivo) rat parotid gland, ANP did not inhibit adenylate cyclase. ANP(10−7M) inhibited cAMP accumulation stimulated by forskolin (10−6M) in control rat parotid acinar cells by about 34%, however, in PT-treated cells, the inhibitory effect of ANP was attenuated completely. In control cells, amylase release stimulated by isoproterenol (10−6M) and forskolin (10−6M) were also depressed by ANP (10−7M) by 27 and 30%, respectively. The inhibitory response of ANP on amylase release was completely attenuated by PT-treatment. Gi was detected as a ADP-ribosylated 41-KDa protein by incubation of parotid membranes with PT and [α-32P]NAD. In rat parotid gland, these results suggested that ANP mediates adenylate cyclase/cAMP system and consequently reduces amylase release through ANP-C receptor coupled to Gi. (Mol Cell Biochem)139: 53–58, 1994)
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Shimomura, H., Nashida, T. & Imai, A. Effect of PT-treatment on ANP-mediated inhibition of adenylate cyclase and amylase release in rat parotid gland. Mol Cell Biochem 139, 53–58 (1994). https://doi.org/10.1007/BF00944203
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DOI: https://doi.org/10.1007/BF00944203