PMID- 38252666 OWN - NLM STAT- MEDLINE DCOM- 20240307 LR - 20240307 IS - 1522-1504 (Electronic) IS - 1040-0605 (Linking) VI - 326 IP - 3 DP - 2024 Mar 1 TI - Role of ZIP kinase in development of myofibroblast differentiation from HPMCs. PG - L353-L366 LID - 10.1152/ajplung.00251.2023 [doi] AB - During the development of pleural fibrosis, pleural mesothelial cells (PMCs) undergo phenotypic switching from differentiated mesothelial cells to mesenchymal cells (MesoMT). Here, we investigated how external stimuli such as TGF-beta induce HPMC-derived myofibroblast differentiation to facilitate the development of pleural fibrosis. TGF-beta significantly increased di-phosphorylation but not mono-phosphorylation of myosin II regulatory light chain (RLC) in HPMCs. An increase in RLC di-phosphorylation was also found at the pleural layer of our carbon black bleomycin (CBB) pleural fibrosis mouse model, where it showed filamentous localization that coincided with alpha smooth muscle actin (alphaSMA) in the cells in the pleura. Among the protein kinases that can phosphorylate myosin II RLC, ZIPK (zipper-interacting kinase) protein expression was significantly augmented after TGF-beta stimulation. Furthermore, ZIPK gene silencing attenuated RLC di-phosphorylation, suggesting that ZIPK is responsible for di-phosphorylation of myosin II in HPMCs. Although TGF-beta significantly increased the expression of ZIP kinase protein, the change in ZIP kinase mRNA was marginal, suggesting a posttranscriptional mechanism for the regulation of ZIP kinase expression by TGF-beta. ZIPK gene knockdown (KD) also significantly reduced TGF-beta-induced upregulation of alphaSMA expression. This finding suggests that siZIPK attenuates myofibroblast differentiation of HPMCs. siZIPK diminished TGF-beta-induced contractility of HPMCs consistent with siZIPK-induced decrease in the di-phosphorylation of myosin II RLC. The present results implicate ZIPK in the regulation of the contractility of HPMC-derived myofibroblasts, phenotype switching, and myofibroblast differentiation of HPMCs.NEW & NOTEWORTHY Here, we highlight that ZIP kinase is responsible for di-phosphorylation of myosin light chain, which facilitates stress fiber formation and actomyosin-based cell contraction during mesothelial to mesenchymal transition in human pleural mesothelial cells. This transition has a significant impact on tissue remodeling and subsequent stiffness of the pleura. This study provides insight into a new therapeutic strategy for the treatment of pleural fibrosis. FAU - Choo, Young-Yeon AU - Choo YY AUID- ORCID: 0000-0001-5288-1186 AD - Department of Cellular and Molecular Biology, The University of Texas at Tyler Health Science Center, Tyler, Texas, United States. ROR: https://ror.org/01sps7q28 FAU - Sakai, Tsuyoshi AU - Sakai T AUID- ORCID: 0000-0002-2153-0831 AD - Department of Cellular and Molecular Biology, The University of Texas at Tyler Health Science Center, Tyler, Texas, United States. ROR: https://ror.org/01sps7q28 FAU - Ikebe, Reiko AU - Ikebe R AD - Department of Cellular and Molecular Biology, The University of Texas at Tyler Health Science Center, Tyler, Texas, United States. ROR: https://ror.org/01sps7q28 FAU - Jeffers, Ann AU - Jeffers A AD - Department of Cellular and Molecular Biology, The University of Texas at Tyler Health Science Center, Tyler, Texas, United States. ROR: https://ror.org/01sps7q28 FAU - Idell, Steven AU - Idell S AUID- ORCID: 0000-0003-4389-2152 AD - Department of Cellular and Molecular Biology, The University of Texas at Tyler Health Science Center, Tyler, Texas, United States. ROR: https://ror.org/01sps7q28 FAU - Tucker, Torry A AU - Tucker TA AUID- ORCID: 0000-0002-0823-3234 AD - Department of Cellular and Molecular Biology, The University of Texas at Tyler Health Science Center, Tyler, Texas, United States. ROR: https://ror.org/01sps7q28 FAU - Ikebe, Mitsuo AU - Ikebe M AUID- ORCID: 0000-0002-8299-6643 AD - Department of Cellular and Molecular Biology, The University of Texas at Tyler Health Science Center, Tyler, Texas, United States. ROR: https://ror.org/01sps7q28 LA - eng GR - HL142853/HHS | NIH | National Heart, Lung, and Blood Institute (NHLBI)/ PT - Journal Article DEP - 20240122 PL - United States TA - Am J Physiol Lung Cell Mol Physiol JT - American journal of physiology. Lung cellular and molecular physiology JID - 100901229 RN - EC 2.7.11.1 (Death-Associated Protein Kinases) RN - 0 (Myosin Light Chains) RN - EC 3.6.1.- (Myosin Type II) RN - 0 (Transforming Growth Factor beta) SB - IM MH - Mice MH - Animals MH - Humans MH - Death-Associated Protein Kinases/genetics/metabolism MH - *Myofibroblasts/metabolism MH - Phosphorylation MH - Myosin Light Chains/metabolism MH - *Pleural Diseases/metabolism MH - Myosin Type II/metabolism MH - Transforming Growth Factor beta/pharmacology/metabolism MH - Fibrosis OTO - NOTNLM OT - ZIP kinase OT - lung mesothelial cells OT - myosin light chain phosphorylation OT - pleural fibrosis OT - stress fiber EDAT- 2024/01/22 18:42 MHDA- 2024/03/07 06:43 CRDT- 2024/01/22 13:35 PHST- 2024/03/07 06:43 [medline] PHST- 2024/01/22 18:42 [pubmed] PHST- 2024/01/22 13:35 [entrez] AID - 10.1152/ajplung.00251.2023 [doi] PST - ppublish SO - Am J Physiol Lung Cell Mol Physiol. 2024 Mar 1;326(3):L353-L366. doi: 10.1152/ajplung.00251.2023. Epub 2024 Jan 22.