- HJ Donahue, F Guilak, MA Vander Molen, KJ McLeod, CT Rubin, DA Grande, PR Brink, Chondrocytes isolated from mature articular cartilage retain the capacity to form functional gap junctions.,
Journal of bone and mineral research : the official journal of the American Society for Bone and Mineral Research, UNITED STATES, vol. 10 no. 9
pp. 1359-64 .
(last updated on 2006/06/06)
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.
Animals • Cartilage, Articular • Cattle • Cell Aging • Cell Communication • Cell Separation • Cells, Cultured • Connexin 43 • Gap Junctions • analysis • chemistry • cytology • physiology • physiology*