CCN6 regulates mitochondrial respiratory complex assembly and activity.

Publisher: Federation of American Societies for Experimental Biology Country of Publication: United States NLM ID: 8804484 Publication Model: Print-Electronic Cited Medium: Internet ISSN: 1530-6860 (Electronic) Linking ISSN: 08926638 NLM ISO Abbreviation: FASEB J Subsets: MEDLINE

Publication: 2020- : [Bethesda, Md.] : Hoboken, NJ : Federation of American Societies for Experimental Biology ; Wiley
Original Publication: [Bethesda, Md.] : The Federation, [c1987-

CCN Intercellular Signaling Proteins/*metabolism ; Chondrocytes/*metabolism ; Mitochondria/*metabolism ; Mitochondrial Membranes/*metabolism; CCN Intercellular Signaling Proteins/genetics ; Cell Line ; Electron Transport ; Humans ; Mitochondria/genetics ; Mutation

Cellular communication network factor 6 (CCN6) mutations are linked with Progressive Pseudo Rheumatoid Dysplasia (PPRD) a debilitating musculoskeletal disorder. The function of CCN6 and the mechanism of PPRD pathogenesis remain unclear. Accordingly, we focused on the functional characterization of CCN6 and CCN6 mutants. Using size exclusion chromatography and native polyacrylamide gel electrophoresis we demonstrated that CCN6 is present as a component of the mitochondrial respiratory complex in human chondrocyte lines. By means of siRNA-mediated transfection and electron microscopy we showed that moderate reduction in CCN6 expression decreases the RER- mitochondria inter-membrane distance. Parallel native PAGE, immunoblotting and Complex I activity assays furthermore revealed increase in both mitochondrial distribution of CCN6 and mitochondrial respiratory complex assembly/activity in CCN6 depleted cells. CCN6 mutants resembling those linked with PPRD, which were generated by CRISPR-Cas9 technology displayed low level of expression of mutant CCN6 protein and inhibited respiratory complex assembly/activity. Electron microscopy and MTT assay of the mutants revealed abnormal mitochondria and poor cell viability. Taken together, our results indicate that CCN6 regulates mitochondrial respiratory complex assembly/activity as part of the mitochondrial respiratory complex by controlling the proximity of RER with the mitochondria, and CCN6 mutations disrupt mitochondrial respiratory complex assembly/activity resulting in mitochondrial defects and poor cell viability.
(© 2020 Federation of American Societies for Experimental Biology.)

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I01 BX003934 United States BX BLRD VA

Keywords: PPRD; chondrocyte; mitochondria

0 (CCN Intercellular Signaling Proteins)
0 (CCN6 protein, human)

Date Created: 20200721 Date Completed: 20210310 Latest Revision: 20210310

20231215

10.1096/fj.202000405RR

32686858