Dataset Information

ADAMTS-9 in Mouse Cartilage Has Aggrecanase Activity That Is Distinct from ADAMTS-4 and ADAMTS-5.

ABSTRACT: A disintegrin and metalloproteinase with thrombospondin motifs (ADAMTS)-4 and ADAMTS-5 are the principal aggrecanases in mice and humans; however, mice lacking the catalytic domain of both enzymes (TS-4/5∆cat) have no skeletal phenotype, suggesting there is an alternative aggrecanase for modulating normal growth and development in these mice. We previously identified aggrecanase activity that (a) cleaved at E↓G rather than E↓A bonds in the aggrecan core protein, and (b) was upregulated by retinoic acid but not IL-1α. The present study aimed to identify the alternative aggrecanase. Femoral head cartilage explants from TS-4/5∆cat mice were stimulated with IL-1α or retinoic acid and total RNA was analysed by microarray. In addition to ADAMTS-5 and matrix metalloproteinase (MMP)-13, which are not candidates for the novel aggrecanase, the microarray analyses identified MMP-11, calpain-5 and ADAMTS-9 as candidate aggrecanases upregulated by retinoic acid. When calpain-5 and MMP-11 failed to meet subsequent criteria, ADAMTS-9 emerged as the most likely candidate for the novel aggrecanase. Immunohistochemistry revealed ADAMTS-9 expression throughout the mouse growth plate and strong expression, particularly in the proliferative zone of the TS-4/5-∆cat mice. In conclusion, ADAMTS-9 has a novel specificity for aggrecan, cleaving primarily at E↓G rather than E↓A bonds in mouse cartilage. ADAMTS-9 might have more important roles in normal skeletal development compared with ADAMTS-4 and ADAMTS-5, which have key roles in joint pathology.

SUBMITTER: Rogerson FM

PROVIDER: S-EPMC6387038 | biostudies-literature | 2019 Jan

REPOSITORIES: biostudies-literature

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ADAMTS-9 in Mouse Cartilage Has Aggrecanase Activity That Is Distinct from ADAMTS-4 and ADAMTS-5.

Rogerson Fraser M FM Last Karena K Golub Suzanne B SB Gauci Stephanie J SJ Stanton Heather H Bell Katrina M KM Fosang Amanda J AJ

International journal of molecular sciences 20190129 3

A disintegrin and metalloproteinase with thrombospondin motifs (ADAMTS)-4 and ADAMTS-5 are the principal aggrecanases in mice and humans; however, mice lacking the catalytic domain of both enzymes (TS-4/5∆cat) have no skeletal phenotype, suggesting there is an alternative aggrecanase for modulating normal growth and development in these mice. We previously identified aggrecanase activity that (a) cleaved at E↓G rather than E↓A bonds in the aggrecan core protein, and (b) was upregulated by retino ...[more]

PMID: 30699963

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Project description:Although ADAMTS-4 and ADAMTS-5 are the principal aggrecanases in mice and humans, mice lacking both these enzymes (ADAMTS-4/-5Dcat) are healthy, viable, with no overt skeletal phenotype, suggesting the presence of an alternative aggrecanase in these mice. We previously identified a novel aggrecanase activity that was regulated by retinoic acid, but not IL-1a. The upregulated activity cleaved aggrecan at E↓A bonds. This study aimed to identify the alternative aggrecanase. Femoral head cartilage from TS-4/5Dcat mice was stimulated with IL-1a or retinoic acid and total RNA was analysed by microarray. Candidate, upregulated genes identified by Quantile Normalisation included ADAMTS, MMPm cathepsin and calpain families as putative aggrecanases. Three criteria, including quantitative RT-PCR analyses, sensitivity to retinoic acid treatment and sensitivity to TIMP-3 inhibition, were then used as readouts to identify candidate extracellular proteinases whose mRNA expression levels were increased by retinoic acid, but not by IL-1a treatment. Thereafter, gene silencing was used to identify the most likely aggrecanase in chondrocytes from TS-4/5Dcat mice. Aggrecanase activity was monitored by Western blotting and immunohistochemistry with neoepitope antibodies. The microarray analyses identified ADAMTS-9, MMP-11 and calpain-5 as candidate aggrecanases that were upregulated by retinoic acid. While qPCR confirmed this finding, calpain 5 was excluded from the candidate list because it was not inhibited by TIMP-3. MMP-11 was also excluded because it was upregulated by IL-1a. ADAMTS-9 therefore emerged as a candidate for the novel aggrecanase. Gene silencing confirmed ADAMTS-9 as the putative aggrecanase. Immunohistochemistry revealed that ADAMTS-9 in mouse knee joints was expressed in the proliferative zone of both wildtype and TS-4/5Dcat growth plates, and also in the calcified cartilage of the wildtype hypertrophic zone. In conclusion, ADAMTS-9 is an aggrecanase that cleaves at FREEE1467↓1468GLGS in the chondroitin sulphate-rich region of aggrecan.

Project description:BackgroundProgressive loss of articular cartilage is a central hallmark in many joint disease, however, the relative importance of individual proteolytic pathways leading to cartilage erosion is at present unknown. We therefore investigated the time-dependant release ex vivo of MMP- and aggrecanase-derived fragments of aggrecan and type II collagen into the supernatant of bovine cartilage explants cultures using neo-epitope specific immunoassays, and to associate the release of these fragments with the activity of proteolytic enzymes using inhibitors.FindingsBovine cartilage explants were cultured in the presence or absence of the catabolic cytokines oncostatin M (OSM) and tumor necrosis factor alpha (TNFalpha). In parallel, explants were co-cultured with protease inhibitors such as GM6001, TIMP1, TIMP2 and TIMP3. Fragments released into the supernatant were determined using a range of neo-epitope specific immunoassays; (1) sandwich (342)FFGVG-G2 ELISA, (2) competition NITEGE(373)ELISA (3) sandwich G1-NITEGE(373 )ELISA (4) competition (374)ARGSV ELISA, and (5) sandwich (374)ARGSV-G2 ELISA all detecting aggrecan fragments, and (6) sandwich CTX-II ELISA, detecting C-telopeptides of type II collagen. We found that (1) aggrecanase-derived aggrecan fragments are released in the early (day 2-7) and mid phase (day 9-14) into the supernatant from bovine explants cultures stimulated with catabolic cytokines, (2) the release of NITEGE(373 )neo-epitopes are delayed compared to the corresponding (374)ARGSV fragments, (3) the MMP inhibitor GM6001 did not reduce the release of aggrecanase-derived fragment, but induced a further delay in the release of these fragments, and finally (4) the MMP-derived aggrecan and type II collagen fragments were released in the late phase (day 16-21) only.ConclusionOur data support the model, that aggrecanases and MMPs act independently in the processing of the aggrecan molecules, and furthermore that suppression of MMP-activity had little if any effect on the quantity of aggrecanase-derived fragments released from explants cultures.

Dataset Information

ADAMTS-9 in Mouse Cartilage Has Aggrecanase Activity That Is Distinct from ADAMTS-4 and ADAMTS-5.

Publications

ADAMTS-9 in Mouse Cartilage Has Aggrecanase Activity That Is Distinct from ADAMTS-4 and ADAMTS-5.

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