title: NPs/NPRs Signaling Pathways May Be Involved in Depression-Induced Loss of Gastric ICC by Decreasing the Production of mSCF.
abstract: It is well known that natriuretic peptides (NPs) are involved in the regulation of gastrointestinal motility. Interstitial cells of Cajal (ICC) are the pacemaker cells of gastrointestinal motility and gastrointestinal dyskinesia is one of the important digestive tract symptoms of depression. However, it is unclear whether they are involved in depression-induced loss of ICC. The aim of the present study was to investigate the relationship between the natriuretic peptide signaling pathway and depression-induced loss of gastric ICC in depressed rats. These results showed that the expression of c-kit and stem cell factor (SCF) in smooth muscle layers of stomach were down-regulated in depressed rats at the mRNA and protein levels. The expression of natriuretic peptide receptor (NPR)-A, B and C were up-regulated in the stomach of depressed rats at the mRNA and protein levels. NPR-A, B and C can significantly decrease the expression of SCF to treat cultured gastric smooth muscle cells (GSMCs) obtained from normal rats with different concentrations of C-type natriuretic peptide (CNP). Pretreatment of cultured GSMCs with 8-Brom-cGMP (8-Br-cGMP, a membrane permeable cGMP analog), cANF (a specific NPR-C agonist) and CNP (10-6 mol/L) demonstrated that 8-Br-cGMP had a similar effect as CNP, but treatment with cANF did not. The results of the methyl thiazolyl tetrazolium bromide (MTT) assay indicated that high concentrations of cANF (10-6 mol/L) restrained the proliferation of cultured GSMCs. Taken together, these results indicate that the up-regulation of the NPs/NPR-C and NPs/NPR-A, B/cGMP signaling pathways may be involved in depression-induced loss of gastric ICC.
authors: Central Laboratory, The First Affiliated Hospital of Dalian Medical University, Dalian 116011, Liaoning Province, China.
authors: Xue-Lian
authors: XL
authors: Lin
authors: Department of Gastroenterology, Xiyuan Hospital, China Academy of Chinese Medical Sciences, Beijing, 100091, China.
authors: Xu-Dong
authors: XD
authors: Tang
authors: Department of Neurology, The First Affiliated Hospital of Dalian Medical University, Dalian 116011, Liaoning Province, China.
authors: Zheng-Xu
authors: ZX
authors: Cai
authors: Department of Gastroenterology, Xiyuan Hospital, China Academy of Chinese Medical Sciences, Beijing, 100091, China.
authors: Feng-Yun
authors: FY
authors: Wang
authors: Central Laboratory, The First Affiliated Hospital of Dalian Medical University, Dalian 116011, Liaoning Province, China.
authors: Ping
authors: P
authors: Li
authors: Institute of Basic Research of Integrative Medicine, Dalian Medical University, Dalian, 116044, Liaoning Province, China.
authors: Hua
authors: H
authors: Sui
authors: Central Laboratory, The First Affiliated Hospital of Dalian Medical University, Dalian 116011, Liaoning Province, China.
authors: Hui-Shu
authors: HS
authors: Guo
mesh_terms: D000818:Animals; D001835:Body Weight; D049109:Cell Proliferation; D003863:Depression / Q000378:metabolism* / Q000503:physiopathology; D015536:Down-Regulation; D005753:Gastric Mucosa / Q000378:metabolism*; D005786:Gene Expression Regulation; D056885:Interstitial Cells of Cajal / Q000378:metabolism*; D008297:Male; D032389:Myocytes, Smooth Muscle / Q000166:cytology; D045265:Natriuretic Peptides / Q000378:metabolism; D019009:Proto-Oncogene Proteins c-kit / Q000096:biosynthesis / Q000378:metabolism*; D051381:Rats; D017207:Rats, Sprague-Dawley; D017461:Receptors, Atrial Natriuretic Factor / Q000096:biosynthesis / Q000378:metabolism; D015398:Signal Transduction; D019089:Stem Cell Factor / Q000096:biosynthesis / Q000378:metabolism*; D013778:Tetrazolium Salts / Q000737:chemistry; D013844:Thiazoles / Q000737:chemistry; D015854:Up-Regulation; D000099242:Atrial Natriuretic Factor Receptor B
chemical_list: D045265:Natriuretic Peptides; D019009:Proto-Oncogene Proteins c-kit; D017461:Receptors, Atrial Natriuretic Factor; D019089:Stem Cell Factor; D013778:Tetrazolium Salts; D013844:Thiazoles; D000099242:Atrial Natriuretic Factor Receptor B; C091715:atrial natriuretic factor receptor A; C073616:atrial natriuretic factor receptor C; C022616:thiazolyl blue