title: Secretin induces neurite outgrowth of PC12 through cAMP-mitogen-activated protein kinase pathway.
abstract: The gastrointestinal functions of secretin have been fairly well established. However, its function and mode of action within the nervous system remain largely unclear. To gain insight into this area, we have attempted to determine the effects of secretin on neuronal differentiation. Here, we report that secretin induces the generation of neurite outgrowth in pheochromocytoma PC12 cells. The expressions of Tau and beta-tubulin, neuronal differentiation markers, are increased upon secretin stimulation. In addition, secretin induces sustained mitogen-activated protein kinase (MAPK) activation and also stimulates the cAMP secretion. Moreover, the neurite outgrowth elicited by secretin is suppressed to a marked degree in the presence of either PD98059, a specific MAPK/ERK kinase (MEK) inhibitor, or H89, a specific protein kinase A (PKA) inhibitor. Taken together, these observations demonstrate that secretin induces neurite outgrowth of PC12 cells through cAMP- MAPK pathway, and provide a novel insight into the manner in which secretin participates in neuritogenesis.
authors.affiliation: Department of Life Science, Division of Molecular and Life Science, Pohang University of Science and Technology, Pohang 790-784, Korea.
authors.forename: Hyeon Soo
authors.initials: HS
authors.lastname: Kim
authors.forename: Sanatombi
authors.initials: S
authors.lastname: Yumkham
authors.forename: Sun-Hee
authors.initials: SH
authors.lastname: Kim
authors.forename: Kyungmoo
authors.initials: K
authors.lastname: Yea
authors.forename: You Chan
authors.initials: YC
authors.lastname: Shin
authors.forename: Sung Ho
authors.initials: SH
authors.lastname: Ryu
authors.forename: Pann-Ghill
authors.initials: PG
authors.lastname: Suh
mesh_terms: D000818:Animals; D018929:Cell Culture Techniques; D002454:Cell Differentiation / Q000187:drug effects; D000242:Cyclic AMP / Q000032:analysis / Q000378:metabolism; D004797:Enzyme-Linked Immunosorbent Assay; D016650:Fluorescein-5-isothiocyanate; D005456:Fluorescent Dyes; D015151:Immunoblotting; D007150:Immunohistochemistry; D018613:Microscopy, Confocal; D020928:Mitogen-Activated Protein Kinases / Q000378:metabolism*; D016501:Neurites / Q000187:drug effects*; D009474:Neurons / Q000166:cytology / Q000187:drug effects; D016716:PC12 Cells; D051381:Rats; D020133:Reverse Transcriptase Polymerase Chain Reaction; D012633:Secretin / Q000494:pharmacology*
chemical_list: D005456:Fluorescent Dyes; D012633:Secretin; D000242:Cyclic AMP; D020928:Mitogen-Activated Protein Kinases; D016650:Fluorescein-5-isothiocyanate