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http://dx.doi.org/10.1007/s10059-009-0048-5

Cloning and Characterization of Muscarinic Receptor Genes from the Nile Tilapia (Oreochromis niloticus)  

Seo, Jung Soo (Pathology Division, National Fisheries Research and Development Institute)
Kim, Moo-Sang (Department of Aquatic Life Medicine, Pukyong National University)
Park, Eun Mi (Faculty of Food Science and Biotechnology, Pukyong National University)
Ahn, Sang Jung (Faculty of Food Science and Biotechnology, Pukyong National University)
Kim, Na Young (Department of Aquatic Life Medicine, Pukyong National University)
Jung, Sung Hee (Pathology Division, National Fisheries Research and Development Institute)
Kim, Jin Woo (Pathology Division, National Fisheries Research and Development Institute)
Lee, Hyung Ho (Faculty of Food Science and Biotechnology, Pukyong National University)
Chung, Joon Ki (Department of Aquatic Life Medicine, Pukyong National University)
Abstract
To investigate the regulatory mechanism underlying the contractile response in the intestinal smooth muscle of the nile tilapia (Orechromis niloticus), we used pharmacologic and molecular approaches to identify the muscarinic subreceptors and the intracellular signaling pathways involved in this motility. Myography assays revealed that an M1- and M3-subtype selective antagonist, but not a M2-subtype selective antagonist, inhibited carbachol HCl (CCH)-induced intestinal smooth muscle contraction. In addition, a phospholipase C inhibitor, but not an adenylate cyclase inhibitor, blocked the contractile response to CCH. We also cloned five muscarinic genes (OnM2A, OnM2B, OnM3, OnM5A, and OnM5B) from the nile tilapia. In the phylogenetic analysis and sequence comparison to compare our putative gene products (OnMs) with the sequences obtained from the near complete teleost genomes, we unexpectedly found that the teleost fish have respectively two paralogous genes corresponding to each muscarinic subreceptor, and other teleost fish, except zebrafish, do not possess muscarinic subreceptor M1. In addition, the expression pattern of the nile tilapia muscarinic subreceptor transcripts during CCH-induced intestinal smooth muscle contraction in the proximal intestinal tissue was analyzed by real-time PCR surveys and it was demonstrated that CCH increased the OnMs mRNA expression rapidly and transiently.
Keywords
carbachol; gene cloning; intestinal motility; muscarinic receptor; nile tilapia; Oreochromis niloticus; phopholipase C; real-time PCR;
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