Secretoglobin (SCGB) 3A1 and 3A2 are people of the small molecular weight secretoglobin gene superfamily. located at ?201 to ?209 bp in the mouse gene promoter and the extracellular signal-regulated kinase (ERK)- and p38-mitogen-activated protein kinase (MAPK) pathways are responsible for the OSM-induced up-regulation of SCGB3A1 expression. On the other hand the ?113 to ?273 bp region in the promoter appears to be responsible for the OSM induced down-regulation of the gene. No significant differences in the levels or patterns of specific DNA-binding proteins were found in the ?113 to ?273 bp region as determined by electrophoretic mobility shift assays. Neither the ERK- nor p38-MAPK pathways were involved in the OSM-induced reduction of promoter Zosuquidar 3HCl activity. These results suggest that OSM-induced suppression of SCGB3A2 expression is an indirect effect of OSM. Expression of the Clara cell marker CYP2F2 was markedly decreased upon OSM treatment in parallel with the decrease of SCGB3A2 expression in mtCC cells. The differential regulation of and gene expression by OSM may explain the unique functions of these genes in the lung. and Zosuquidar 3HCl genes are localized on human chromosome 5q31-q35 and their homologous mouse chromosomes (1 2 Human chromosome 5q31-q35 contains an asthma susceptibility locus with a number of genes associated with inflammation such as IL-3 IL-4 IL-5 IL-13 and colony-stimulating factor-2 (1 6 SCGB3A1 (HIN-1) is a tumor suppressor and its expression is silenced by hypermethylation of the gene’s promoter region in the majority of carcinomas including those from breast prostate lung and pancreas (3 7 SCGB3A1 expression can be up-regulated by retinoic acid-induced differentiation Zosuquidar 3HCl of human being bronchial epithelial cells recommending a job for SCGB3A1 in mucinous epithelial cell differentiation (5). A recently available report details SCGB3A1 like a potent inhibitor of cell development cell migration and invasion and these actions could be mediated through the AKT signaling pathway (7). Participation from the AKT pathway can Zosuquidar 3HCl AURKA be implicated in epidermal development element (EGF) and changing development element (TGF)-α-induced SCGB3A1 manifestation (11). Further the Th2 cytokines IL-4 and IL-13 induce SCGB3A1 manifestation suggesting that gene may possibly are likely involved in the pathogenesis of inflammatory lung illnesses (12). In this respect the participation of SCGB3A2 a homologous gene to SCGB3A1 in lung inflammation has been described; proinflammatory cytokines IL-5 and IL-9 reduce SCGB3A2 expression (13 14 whereas anti-inflammatory cytokine IL-10 enhances expression (15). Further SCGB3A2 suppresses lung inflammation in mice when examined using an allergic airway inflammation mouse model in which recombinant adenovirus-expressing SCGB3A2 is usually intranasally administered (16). Thus it seems that SCGB3A1 and SCGB3A2 possess both overlapping and distinct modes of expression and function. Whether and how these two genes are affecting each other’s expression and/or function has not been studied. Oncostatin M (OSM) an IL-6/leukemia inhibitory factor (LIF) family cytokine (also called gp130 cytokine) has been identified as an immediate early gene whose expression is usually up-regulated in response to IL-2 IL-3 and erythropoietin (17). Mouse and human OSM signaling differs; mouse OSM binds to a specific receptor complex (type II) composed of OSM receptor (OSMR) and gp130 whereas human OSM can bind both type I and type II receptor complex where the former is composed of LIF receptor and gp130 (18 19 OSM’s binding to a receptor complex activates JAK/STAT and mitogen-activated protein kinase (MAPK) signaling pathways leading to a variety of activities involved in inflammation remodeling of extracellular matrix hematopoiesis and modulation of cell growth and differentiation (17-20). It regulates gonadocyte and astrocyte differentiation up-regulates liver acute phase protein synthesis by hepatocytes and can induce tissue inhibitor of metalloproteinase 1 (TIMP-1) IL-6 and monocyte chemoattractant protein-1 (MCP-1) expression by mouse fibroblasts (18 19 21 OSM also induces eotaxin-1 expression in NIH 3T3 fibroblast and marked eosinophil infiltration in mouse lungs (24). In this study we demonstrate that OSM regulates expression of SCGB3A1 and SCGB3A2 in an opposite manner when.