Separating friend from foe: Inhibition of TGF-β-induced detrimental SMAD1/5/9 phosphorylation while maintaining protective SMAD2/3 signaling in OA chondrocytes

被引:3
作者
Thielen, Nathalie G. M. [1 ]
van Caam, Arjan P. M. [1 ]
Beuningen, Henk M. V. [1 ]
Vitters, Elly L. [1 ]
van den Bosch, Martijn H. J. [1 ]
Koenders, Marije I. [1 ]
van de Loo, Fons A. J. [1 ]
Davidson, Esmeralda N. Blaney [1 ]
van der Kraan, Peter M. [1 ,2 ]
机构
[1] Radboud Univ Nijmegen, Radboud Inst Mol Life Sci, Dept Expt Rheumatol, Med Ctr, Nijmegen, Netherlands
[2] Radboud Univ Nijmegen, Med Ctr, Expt Rheumatol, Geert Grootepl 28, NL-6525 GA Nijmegen, Netherlands
关键词
TGF-beta; SMAD signaling; ALK5; Osteoarthritis; GROWTH-FACTOR-BETA; ARTICULAR-CARTILAGE; AGING CARTILAGE; OSTEOARTHRITIS; EXPRESSION; ACTIVATION; PROGRESSION; CELLS; BONE; HYPERTROPHY;
D O I
10.1016/j.joca.2023.08.004
中图分类号
R826.8 [整形外科学]; R782.2 [口腔颌面部整形外科学]; R726.2 [小儿整形外科学]; R62 [整形外科学(修复外科学)];
学科分类号
摘要
Objective: Transforming growth factor-beta (TGF-beta) signaling via SMAD2/3 is crucial to control cartilage homeostasis. However, TGF-beta can also have detrimental effects by signaling via SMAD1/5/9 and thereby contribute to diseases like osteoarthritis (OA). In this study, we aimed to block TGF-beta-induced SMAD1/5/9 signaling in primary human OA chondrocytes, while maintaining functional SMAD2/3 signaling.Design: Human OA chondrocytes were pre-incubated with different concentrations of ALK4/5/7 kinase inhibitor SB-505124 before stimulation with TGF-beta. Changes in SMAD C-terminal phosphorylation were analyzed using Western blot and response genes were measured with quantitative Polymerase Chain Reaction. To further explore the consequences of our ability to separate pathways, we investigated TGF-beta induced chondrocyte hypertrophy.Results: Pre-incubation with 0.5 mu M SB-505124, maintained +/- 50% of C-terminal SMAD2/3 phosphorylation and induction of JUNB and SERPINE1, but blocked SMAD1/5/9-C phosphorylation and expression of ID1 and ID3. Furthermore, TGF-beta, in levels comparable to those in the synovial fluid of OA patients, resulted in regulation of hypertrophic and dedifferentiation markers in OA chondrocytes; i.e. an increase in COL10, RUNX2, COL1A1, and VEGF and a decrease in ACAN expression. Interestingly, in a subgroup of OA chondrocyte donors, blocking only SMAD1/5/9 caused stronger inhibition on TGF-beta-induced RUNX2 than blocking both SMAD pathways.Conclusion: Our findings indicate that using low dose of SB-505124 we maintained functional SMAD2/3 signaling that blocks RUNX2 expression in a subgroup of OA patients. We are the first to show that SMAD2/3 and SMAD1/5/9 pathways can be separately modulated using low and high doses of SB-505124 and thereby split TGF-beta's detrimental from protective function in chondrocytes.(c) 2023 The Author(s). Published by Elsevier Ltd on behalf of Osteoarthritis Research Society International. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/).
引用
收藏
页码:1481 / 1490
页数:10
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