PMID- 26519689 OWN - NLM STAT- MEDLINE DCOM- 20160706 LR - 20160216 IS - 1097-4652 (Electronic) IS - 0021-9541 (Linking) VI - 231 IP - 6 DP - 2016 Jun TI - The Transcription Factor EB (TFEB) Regulates Osteoblast Differentiation Through ATF4/CHOP-Dependent Pathway. PG - 1321-33 LID - 10.1002/jcp.25235 [doi] AB - Osteoblasts are bone-forming cells that produce large amounts of collagen type I and various bone matrix proteins. Although osteoblast differentiation is highly regulated by various factors, it remains unknown whether lysosomes are directly involved in osteoblast differentiation. Here, we demonstrate the transcription factor EB (TFEB), a master regulator of lysosomal biogenesis, modulates osteoblast differentiation. The expression levels of TFEB as well as those of endosomal/lysosomal proteins were up-regulated during osteoblast differentiation using mouse osteoblastic MC3T3-E1 cells. By gene knockdown (KD) experiments with small interfering RNA (siRNA), TFEB depletion caused markedly reduced osteoblast differentiation as compared with the control cells. Conversely, overexpression (OE) of TFEB resulted in strikingly enhanced osteoblastogenesis compared to the control cells. By analysis of down-stream effector molecules, TFEB KD was found to cause marked up-regulation of activating transcription factor 4 (ATF4) and CCAAT/enhancer-binding protein homologous protein (CHOP), both of which are essential factors for osteoblastogenesis. In contrast, TFEB OE promoted osteoblast differentiation through reduced expression of ATF4 and CHOP without differentiation agents. Given the importance of ATF4 and CHOP in osteoblastogenesis, it is clear that the TFEB-regulated signaling pathway for osteoblast differentiation is involved in ATF4/CHOP-dependent signaling pathway. CI - (c) 2015 Wiley Periodicals, Inc. FAU - Yoneshima, Erika AU - Yoneshima E AD - Division of Dental Pharmacology, Graduate School of Biomedical Sciences, Nagasaki University, Nagasaki, Japan. AD - Division of Orthodontics and Dentofacial Orthopedics, Graduate School of Biomedical Sciences, Nagasaki University, Nagasaki, Japan. FAU - Okamoto, Kuniaki AU - Okamoto K AD - Division of Dental Pharmacology, Graduate School of Biomedical Sciences, Nagasaki University, Nagasaki, Japan. FAU - Sakai, Eiko AU - Sakai E AD - Division of Dental Pharmacology, Graduate School of Biomedical Sciences, Nagasaki University, Nagasaki, Japan. FAU - Nishishita, Kazuhisa AU - Nishishita K AD - Division of Dental Pharmacology, Graduate School of Biomedical Sciences, Nagasaki University, Nagasaki, Japan. FAU - Yoshida, Noriaki AU - Yoshida N AD - Division of Orthodontics and Dentofacial Orthopedics, Graduate School of Biomedical Sciences, Nagasaki University, Nagasaki, Japan. FAU - Tsukuba, Takayuki AU - Tsukuba T AD - Division of Dental Pharmacology, Graduate School of Biomedical Sciences, Nagasaki University, Nagasaki, Japan. LA - eng PT - Journal Article PT - Research Support, Non-U.S. Gov't DEP - 20151120 PL - United States TA - J Cell Physiol JT - Journal of cellular physiology JID - 0050222 RN - 0 (Atf4 protein, mouse) RN - 0 (BMP2 protein, human) RN - 0 (Basic Helix-Loop-Helix Leucine Zipper Transcription Factors) RN - 0 (Bone Morphogenetic Protein 2) RN - 0 (Ddit3 protein, mouse) RN - 0 (Reactive Oxygen Species) RN - 0 (Smad1 Protein) RN - 0 (Smad1 protein, mouse) RN - 0 (Smad5 Protein) RN - 0 (Smad5 protein, mouse) RN - 0 (Tcfeb protein, mouse) RN - 145891-90-3 (Activating Transcription Factor 4) RN - 147336-12-7 (Transcription Factor CHOP) SB - IM MH - 3T3 Cells MH - Activating Transcription Factor 4/genetics/*metabolism MH - Animals MH - Apoptosis MH - Basic Helix-Loop-Helix Leucine Zipper Transcription Factors/genetics/*metabolism MH - Bone Morphogenetic Protein 2/pharmacology MH - *Cell Differentiation/drug effects MH - Endosomes/metabolism MH - Gene Expression Regulation MH - Gene Knockdown Techniques MH - Lysosomes/metabolism MH - Mice MH - Mitochondria/metabolism MH - Osteoblasts/drug effects/*metabolism/pathology MH - RNA Interference MH - Reactive Oxygen Species/metabolism MH - *Signal Transduction/drug effects MH - Smad1 Protein/genetics/metabolism MH - Smad5 Protein/genetics/metabolism MH - Transcription Factor CHOP/genetics/*metabolism MH - Transfection EDAT- 2015/11/01 06:00 MHDA- 2016/07/07 06:00 CRDT- 2015/11/01 06:00 PHST- 2015/06/25 00:00 [received] PHST- 2015/10/29 00:00 [accepted] PHST- 2015/11/01 06:00 [entrez] PHST- 2015/11/01 06:00 [pubmed] PHST- 2016/07/07 06:00 [medline] AID - 10.1002/jcp.25235 [doi] PST - ppublish SO - J Cell Physiol. 2016 Jun;231(6):1321-33. doi: 10.1002/jcp.25235. Epub 2015 Nov 20.