title: Regulation of PHLDA1 Expression by JAK2-ERK1/2-STAT3 Signaling Pathway.
abstract: Toll-like receptor 2 (TLR2)-mediated signaling cascades and gene regulation are mainly involved in diseases, such as immunity and inflammation. In this study, microarray analysis was performed using bone marrow-derived macrophages (BMDM) and Raw 264.7 cells to identify novel proteins involved in the TLR2-mediated cellular response. We found that pleckstrin homology-like domain family, member 1 (PHLDA1) is a novel gene up-regulated by TLR2 stimulation and determined the unique signaling pathway for its expression. Treatment with TLR2 agonist Pam3 CSK4 increased mRNA, protein, and fluorescence staining of PHLDA1. Induction of PHLDA1 by TLR2 stimulation disappeared from TLR2 KO mice-derived BMDM. Among janus kinase (JAK) family members, JAK2 was involved in TLR2-stimulated PHLDA1 expression. Signal transducer and activator of transcription 3 (STAT3) also participated in PHLDA1 expression downstream of the JAK2. Interestingly, ERK1/2 was an intermediate between JAK2 and STAT3. In silico analysis revealed the presence of highly conserved γ-activated sites within mouse PHLDA1 promoter and confirmed the JAK2-STAT3 pathway is important to Pam3 CSK4 -induced PHLDA1 transcription. These findings suggest that the JAK2-ERK1/2-STAT3 pathway is an important signaling pathway for PHLDA1 expression and that these proteins may play a critical role in eliciting TLR2-mediated immune and inflammatory response.
authors.affiliation: Department of Biochemistry and Molecular Biology, College of Medicine, Yeungnam University, 170 Hyeonchung-ro, Nam-gu, Daegu, 705-703, South Korea.
authors.forename: Ji Hyo
authors.initials: JH
authors.lastname: Lyu
authors.affiliation: Department of Biochemistry and Molecular Biology, College of Medicine, Yeungnam University, 170 Hyeonchung-ro, Nam-gu, Daegu, 705-703, South Korea.
authors.forename: Bin
authors.initials: B
authors.lastname: Huang
authors.affiliation: Department of Biochemistry and Molecular Biology, College of Medicine, Yeungnam University, 170 Hyeonchung-ro, Nam-gu, Daegu, 705-703, South Korea.
authors.forename: Dae-Weon
authors.initials: DW
authors.lastname: Park
authors.affiliation: Department of Biochemistry and Molecular Biology, College of Medicine, Yeungnam University, 170 Hyeonchung-ro, Nam-gu, Daegu, 705-703, South Korea.
authors.forename: Suk-Hwan
authors.initials: SH
authors.lastname: Baek
mesh_terms: D000818:Animals; D001483:Base Sequence; D001665:Binding Sites; D015870:Gene Expression; D005786:Gene Expression Regulation; D053614:Janus Kinase 2 / Q000378:metabolism; D020935:MAP Kinase Signaling System; D051379:Mice; D011401:Promoter Regions, Genetic; D000067996:RAW 264.7 Cells; D050796:STAT3 Transcription Factor / Q000378:metabolism; D014157:Transcription Factors / Q000235:genetics / Q000378:metabolism*
chemical_list: C114072:Phlda1 protein, mouse; D050796:STAT3 Transcription Factor; C494087:Stat3 protein, mouse; D014157:Transcription Factors; C507926:Jak2 protein, mouse; D053614:Janus Kinase 2
keywords: JAK2; PHLDA1; STAT3; TLR2