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Expression of Novel Neurotrophin-1/B-Cell Stimulating Factor-3 (NNT-1/BSF-3) in Murine Pituitary Folliculostellate TtT/GF Cells: Pituitary Adenylate Cyclase-Activating Polypeptide and Vasoactive Intestinal Peptide-Induced Stimulation of NNT-1/BSF-3 Is Mediated by Protein Kinase A, Protein Kinase C, and Extracellular-Signal-Regulated Kinase1/2 Pathways

Department of Internal Medicine II (G.V., K.Z., S.H., D.E., C.J.A.), Klinikum der Ludwig-Maximilians-Universität München, Standort Grosshadern, Munich 81377, Germany; and Department of Neuroendocrinology (G.K.S.), Max-Planck Institute of Psychiatry, Munich 80804, Germany

Address all correspondence and requests for reprints to: Christoph J. Auernhammer, M.D., Department of Internal Medicine II, Klinikum der Ludwig-Maximilians-Universität München, Standort Grosshadern, Marchioninistrasse 15, Munich 81377, Germany. E-mail: christoph.auernhammer{at}med.uni-muenchen.de.

Novel neurotrophin-1/B cell stimulating factor-3 (NNT-1/BSF-3) is a gp130 cytokine potently stimulating corticotroph proopiomelanocortin gene expression and ACTH secretion by a Janus kinase-signal transducer and activator of transcription (JAK-STAT)-dependent mechanism. In the current study, we examined the regulation of NNT-1/BSF-3 mRNA expression in murine pituitary folliculostellate TtT/GF cells using Northern blot technique. A 5- to 9-fold and a 4- to 7-fold induction in NNT-1/BSF-3 mRNA expression was observed between 2 and 6 h stimulation with the protein kinase C (PKC) stimulus phorbol-12-myristate-13-acetate (100 nM) and the protein kinase A (PKA) stimulus Bu₂cAMP (5 mM), respectively. Pituitary adenylate cyclase-activating polypeptide (PACAP-38, 50 nM) and vasoactive intestinal peptide (VIP, 50 nM) also stimulated NNT-1/BSF-3 mRNA expression 5- to 9-fold between 2 and 6 h. Preincubation with PKC and PKA inhibitors such as H-7 (20 µM), GF109203X (50 µM), and H-89 (50 µM) decreased the stimulatory effects of PACAP and VIP. Both PACAP-38 and VIP also rapidly induced ERK1/2 phosphorylation and their stimulatory effect on NNT-1/BSF-3 mRNA expression was reduced by the MAPK kinase/ERK kinase (MEK) inhibitor U0126 (10 µM). Dexamethasone (10^-7 M) was a potent inhibitor of phorbol-12-myristate-13-acetate-induced NNT-1/BSF-3 expression. RT-PCR analysis demonstrated TtT/GF cells to express the short and the hop variant but not the hip variant of the PACAP-1 receptor (PAC1-R). In addition, TtT/GF cells express the VIP/PACAP-2 receptor (VPAC2-R). In summary, NNT-1/BSF-3 is expressed in pituitary folliculostellate TtT/GF cells and induced by PKC-, PKA-, and ERK1/2-dependent mechanisms. The novel gp130 cytokine NNT-1/BSF-3 derived from folliculostellate cells might act as a paracrine neuroimmunoendocrine modulator of pituitary corticotroph function.

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