title: Effect of mitogen-activated protein kinases on chemokine synthesis induced by substance P in mouse pancreatic acinar cells.
abstract: Substance P, acting via its neurokinin 1 receptor (NK1 R), plays an important role in mediating a variety of inflammatory processes. Its interaction with chemokines is known to play a crucial role in the pathogenesis of acute pancreatitis. In pancreatic acinar cells, substance P stimulates the release of NFkappaB-driven chemokines. However, the signal transduction pathways by which substance P-NK1 R interaction induces chemokine production are still unclear. To that end, we went on to examine the participation of mitogen-activated protein kinases (MAPKs) in substance P-induced synthesis of pro-inflammatory chemokines, monocyte chemoanractant protein-1 (MCP-I), macrophage inflammatory protein-lalpha (MIP-lalpha) and macrophage inflammatory protein-2 (MIP-2), in pancreatic acini. In this study, we observed a time-dependent activation of ERK1/2, c-Jun N-terminal kinase (JNK), NFkappaB and activator protein-1 (AP-1) when pancreatic acini were stimulated with substance P. Moreover, substance P-induced ERK 1/2, JNK, NFkappaB and AP-1 activation as well as chemokine synthesis were blocked by pre-treatment with either extracellular signal-regulated protein kinase kinase 1 (MEK1) inhibitor or JNK inhibitor. In addition, substance P-induced activation of ERK 112, JNK, NFkappaB and AP-1-driven chemokine production were attenuated by CP96345, a selective NK1 R antagonist, in pancreatic acinar cells. Taken together, these results suggest that substance P-NK1 R induced chemokine production depends on the activation of MAPKs-mediated NFkappaB and AP-1 signalling pathways in mouse pancreatic acini.
authors.affiliation: Department of Pharmacology, National University of Singapore, Singapore.
authors.forename: Raina Devi
authors.initials: RD
authors.lastname: Ramnath
authors.forename: Jia
authors.initials: J
authors.lastname: Sun
authors.forename: Sharmila
authors.initials: S
authors.lastname: Adhikari
authors.forename: Madhav
authors.initials: M
authors.lastname: Bhatia
mesh_terms: D000818:Animals; D018925:Chemokines / Q000096:biosynthesis*; D004789:Enzyme Activation / Q000187:drug effects; D005419:Flavonoids / Q000494:pharmacology; D048031:JNK Mitogen-Activated Protein Kinases / Q000378:metabolism; D051379:Mice; D019950:Mitogen-Activated Protein Kinase 1 / Q000378:metabolism; D048052:Mitogen-Activated Protein Kinase 3 / Q000378:metabolism; D020928:Mitogen-Activated Protein Kinases / Q000378:metabolism*; D008954:Models, Biological; D016328:NF-kappa B / Q000378:metabolism; D046790:Pancreas, Exocrine / Q000187:drug effects* / Q000201:enzymology*; D010766:Phosphorylation / Q000187:drug effects; D011485:Protein Binding / Q000187:drug effects; D018040:Receptors, Neurokinin-1 / Q000378:metabolism; D013373:Substance P / Q000494:pharmacology*; D013997:Time Factors; D018808:Transcription Factor AP-1 / Q000378:metabolism
chemical_list: D018925:Chemokines; D005419:Flavonoids; D016328:NF-kappa B; D018040:Receptors, Neurokinin-1; D018808:Transcription Factor AP-1; D013373:Substance P; D048031:JNK Mitogen-Activated Protein Kinases; D019950:Mitogen-Activated Protein Kinase 1; D048052:Mitogen-Activated Protein Kinase 3; D020928:Mitogen-Activated Protein Kinases; C093973:2-(2-amino-3-methoxyphenyl)-4H-1-benzopyran-4-one