Chondrocytes isolated from mature articular cartilage retain the capacity to form functional gap junctions

Henry J. Donahue, Farshid Guilak, Monique A. Vander Molen, Kenneth J. Mcleod, Clinton T. Rubin, Daniel A. Grande, Peter R. Brink

Research output: Contribution to journalArticlepeer-review

63 Scopus citations

Abstract

The distribution, expression, and functionality of gap junctions was examined in bovine chondrocytes (BCs) isolated from mature articular cartilage. BC cells displayed immunoreactivity for connexin 43 (Cx43), a specific gap junction protein. Cx43 protein expression was confirmed by Western blot analysis, and Cx43 mRNA was detected by nuclease protection assay. Additionally, BCs were shown to be functionally coupled, as revealed by dye transfer studies, and octanol, a gap junction uncoupler, greatly attenuated coupling. Furthermore, confocal microscopy of fluo‐3 loaded BC cells revealed that deformation‐induced cytosolic Ca2+ ion (Ca2+) signals propagated from cell‐to‐cell via gap junctions. To our knowledge, this is the first evidence suggesting that chondrocytes isolated from adult articular cartilage express functional gap junctions.

Original languageEnglish
Pages (from-to)1359-1364
Number of pages6
JournalJournal of Bone and Mineral Research
Volume10
Issue number9
DOIs
StatePublished - Sep 1995

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