title: Ciprofloxacin-mediated inhibition of tenocyte migration and down-regulation of focal adhesion kinase phosphorylation.
abstract: Ciprofloxacin-induced tendinopathy and tendon rupture have been previously described, principally affecting the Achilles tendon. However, the underlying mechanism remains unclear. Tendon healing requires migration of tenocytes to the repair site, followed by proliferation and synthesis of the extracellular matrix. This study was designed to determine the effect of ciprofloxacin on migration of tenocytes intrinsic to rat Achilles tendon. Whether a correlation exits between this effect and the expression and phosphorylation of focal adhesion kinase (FAK), which is a positive regulator of cell motility, was also investigated. Using cultured tenocytes, migration was evaluated by counting the number of initial cell outgrowth from the tendon explants and by transwell filter migration assay. Tenocyte spreading was also evaluated microscopically. The serum-induced protein expression and phosphorylation of FAK were determined by Western blot analysis in synchronized tenocytes. Ciprofloxacin dose-dependently inhibited tenocytes outgrowth from the explants ex vivo, migration of tenocytes through the transwell filter, as well as cell spreading in vitro. Suppression of FAK phosphorylation was revealed by Western blot analyses. In conclusion, ciprofloxacin inhibits tenocyte migration in a process that is probably mediated by inhibition of FAK phosphorylation.
authors.affiliation: Department of Physical Medicine and Rehabilitation, Chang Gung Memorial Hospital, Taiwan.
authors.forename: Wen-Chung
authors.initials: WC
authors.lastname: Tsai
authors.forename: Chih-Chin
authors.initials: CC
authors.lastname: Hsu
authors.forename: Huang-Chung
authors.initials: HC
authors.lastname: Chen
authors.forename: Ya-Hui
authors.initials: YH
authors.lastname: Hsu
authors.forename: Miao-Sui
authors.initials: MS
authors.lastname: Lin
authors.forename: Chin-Wen
authors.initials: CW
authors.lastname: Wu
authors.forename: Jong-Hwei S
authors.initials: JH
authors.lastname: Pang
mesh_terms: D000125:Achilles Tendon / Q000166:cytology / Q000187:drug effects* / Q000293:injuries; D000818:Animals; D000890:Anti-Infective Agents / Q000008:administration & dosage / Q000633:toxicity*; D015153:Blotting, Western; D002465:Cell Movement / Q000187:drug effects; D049109:Cell Proliferation / Q000187:drug effects; D002478:Cells, Cultured; D002939:Ciprofloxacin / Q000008:administration & dosage / Q000633:toxicity*; D004305:Dose-Response Relationship, Drug; D015536:Down-Regulation / Q000187:drug effects; D051416:Focal Adhesion Protein-Tyrosine Kinases / Q000187:drug effects* / Q000378:metabolism; D015971:Gene Expression Regulation, Enzymologic / Q000187:drug effects; D008297:Male; D010766:Phosphorylation / Q000187:drug effects; D051381:Rats; D017207:Rats, Sprague-Dawley; D052256:Tendinopathy / Q000139:chemically induced; D014945:Wound Healing / Q000187:drug effects
chemical_list: D000890:Anti-Infective Agents; D002939:Ciprofloxacin; D051416:Focal Adhesion Protein-Tyrosine Kinases