Abstract
The molecular mechanisms of cartilage differentiation are poorly understood. In a variety of tissues other than cartilage, members of the basic helix-loop-helix (bHLH) family of transcription factors have been demonstrated to play critical roles in differentiation. We have characterized the human bHLH gene HES5 and investigated its role during chondrogenesis. Blockage of the Notch signaling pathway with a γ-secretase inhibitor has demonstrated that the human HES5 gene is a downstream marker of Notch signaling in articular chondrocytes. Markers for the Notch signaling pathway significantly decrease during cartilage differentiation in vitro. Cell proliferation assayed by using BrdU has revealed that blockage of Notch signaling is associated with significantly decreased proliferation. Northern blot and reverse transcription/polymerase chain reaction of a panel of various tissues have shown that HES5 is transcribed as a 5.4-kb mRNA that is ubiquitously expressed in diverse fetal and adult tissues. Articular cartilage from HES5−/− and wild-type mice has been analyzed by using various histological stains. No differences have been detected between the wild-type and HES5−/− mice. Our data thus indicate that the human HES5 gene is coupled to the Notch receptor family, that expression of Notch markers (including HES5) decreases during cartilage differentiation, and that the blockage of Notch signaling is associated with significantly decreased cell proliferation.
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Acknowledgements
We thank Dr. Konrad Slynarski, Department of Orthopedic Surgery and Rehabilitation, 2nd Medical University of Warsaw for providing whole cartilage biopsies, and Helena Barreto, Kristina Kajic, and Josefine van der Lee for excellent technical assistance.
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This work was supported by the Swedish Medical Research Council (grant no. K2004-32X-13110-06A), Gothenburg University, and Sahlgrenska University Hospital.
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Karlsson, C., Jonsson, M., Asp, J. et al. Notch and HES5 are regulated during human cartilage differentiation. Cell Tissue Res 327, 539–551 (2007). https://doi.org/10.1007/s00441-006-0307-0
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DOI: https://doi.org/10.1007/s00441-006-0307-0