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Identification and differential expression of human collagenase-3 mRNA species derived from internal deletion, alternative splicing, and different polyadenylation and transcription initiation sites

Abstract : Objective: Collagenase-3 is a metalloprotease that plays a role in tissue remodeling and pathological processes including arthritis. The human gene is transcribed into major (3.0 and 2.5 kb) and minor (2.2/2.0 kb) transcripts, as seen in Northern blot assays. We investigated the possibility that other transcripts, not detectable by Northern blot, were synthesized as either coding or regulatory RNAs that would modulate collagenase-3 expression and function/activity. Design: We screened a cDNA library and total RNA from human chondrocytes by plaque hybridization and RT-PCR, and expressed the transcripts in a cellular environment. The levels of expression of each transcript in normal and osteoarthritic joint cells and cartilage were monitored by RT-PCR. Results: We identified five different collagenase-3 RNA species derived from alternative polyadenylation sites (COL3-APS), internal deletion (COL3-DEL), alternative splicing (COL3-9B/COL3-9B-2), and different transcription initiation site (COL3-ATS and COL3-ATS-INT). Each transcript could be translated in a cellular environment. Interestingly, the proteins translated from the COL3-DEL and COL3-9B-2 transcripts had a modified hemopexin-like domain, suggesting altered collagenolytic activities. The transcript types COL3-APS, COL3-9B-2, and COL3-ATS were up-regulated in the osteoarthritic samples and expressed in the chondrosarcoma cell line SW1353. Conclusion: Our data show that the human collagenase-3 gene is subjected to different levels of regulation and constitutes a more complex system than was originally thought.
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https://hal.univ-lorraine.fr/hal-01705862
Contributor : Pascal Reboul <>
Submitted on : Friday, February 9, 2018 - 9:32:03 PM
Last modification on : Thursday, March 11, 2021 - 10:36:02 AM

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G. Tardif, M. Dupuis, P. Reboul, C.S Geng, Jean Pelletier, et al.. Identification and differential expression of human collagenase-3 mRNA species derived from internal deletion, alternative splicing, and different polyadenylation and transcription initiation sites. Osteoarthritis and Cartilage, Elsevier, 2003, 11 (7), pp.524 - 537. ⟨10.1016/S1063-4584(03)00079-7⟩. ⟨hal-01705862⟩

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