title: Mild electrical stimulation with heat stimulation increase heat shock protein 70 in articular chondrocyte.
abstract: The objective of this study is to investigate the effects of mild electrical stimulation (MES) and heat stress (HS) on heat shock protein 70 (HSP70), that protects chondrocytes and enhances cartilage matrix metabolism, in chondrocyte and articular cartilage. Rabbit articular chondrocytes were treated with MES and/or HS. The safeness was assessed by LDH assay and morphology. HSP70 protein, ubiquitinated proteins and HSP70 mRNA were examined by Western blotting and real-time PCR. Rat knee joints were treated with MES and/or HS. HSP70 protein, ubiquitinated proteins, HSP70 mRNA and proteoglycan core protein (PG) mRNA in articular cartilage were investigated. In vitro, HS increased HSP70 mRNA and HSP70 protein. MES augmented ubiquitinated protein and HSP70 protein, but not HSP70 mRNA. MES + HS raised HSP70 mRNA and ubiquitinated protein, and significantly increased HSP70 protein. In vivo, HS and MES + HS treatment augmented HSP70 mRNA. HS modestly augmented HSP70 protein. MES + HS significantly increased HSP70 protein and ubiquitinated proteins. PG mRNA was markedly raised by MES + HS. This study demonstrated that MES, in combination with HS, increases HSP70 protein in chondrocytes and articular cartilage, and promotes cartilage matrix metabolism in articular cartilage. MES in combination with HS can be a novel physical therapy for osteoarthritis by inducing HSP70 in articular cartilage.
authors: Department of Orthopaedics, Graduate School of Medical Science, Kyoto Prefectural University of Medicine, Kawaramachi-Hirokoji, Kamigyo-ku, Kyoto, 602-8566, Japan.
authors: Nobuyuki
authors: N
authors: Hiraoka
authors: Yuji
authors: Y
authors: Arai
authors: Kenji A
authors: KA
authors: Takahashi
authors: Osam
authors: O
authors: Mazda
authors: Tsunao
authors: T
authors: Kishida
authors: Kuniaki
authors: K
authors: Honjo
authors: Shinji
authors: S
authors: Tsuchida
authors: Hiroaki
authors: H
authors: Inoue
authors: Saori
authors: S
authors: Morino
authors: Mary Ann
authors: MA
authors: Suico
authors: Hirofumi
authors: H
authors: Kai
authors: Toshikazu
authors: T
authors: Kubo
mesh_terms: D000818:Animals; D002358:Cartilage, Articular / Q000378:metabolism*; D002470:Cell Survival; D019902:Chondrocytes / Q000378:metabolism*; D004558:Electric Stimulation; D018840:HSP70 Heat-Shock Proteins / Q000378:metabolism*; D006358:Hot Temperature; D008297:Male; D012333:RNA, Messenger / Q000378:metabolism; D011817:Rabbits; D051381:Rats; D017207:Rats, Sprague-Dawley; D054875:Ubiquitination
chemical_list: D018840:HSP70 Heat-Shock Proteins; D012333:RNA, Messenger