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Published on: January 7, 2019
Targeting the Galectin Axis in Osteoarthritis: Chondroprotective Effects of Dietary and Pharmacological
Katharina M Pichler1, Selina Kottinger1, Bettina Rodriguez Molina1
1Karl Chiari Lab for Orthopaedic Biology, Division of Orthopedics, Department of Orthopedics and Trauma Surgery, Medical University of Vienna, 1090 Vienna, Austria.
Background/Objectives:
Galectins contribute to the pathogenesis of osteoarthritis (OA) by amplifying inflammatory and catabolic signaling, yet targeted therapeutic approaches remain limited. Three Dimensional (3D) models offer a promising platform to study human OA pathophysiology and evaluate novel interventions.
Methods:
We established 3D pellet cultures derived from human OA chondrocytes to investigate galectin-induced extracellular matrix (ECM) remodeling and the chondroprotective potential of phytochemicals. OA pellets were stimulated with individual galectins (Gal-1, -3, -4, -8) or a Gal-1/-3/-8 mixture, followed by co-treatment with Brazilin, Diacerein, Quercetin, Resveratrol, or Avocado-Soybean Unsaponifiables (ASU). Morphological, histological, biochemical, and gene expression analyses were performed to assess tissue integrity and molecular responses.
Results:
Galectin treatment induced pronounced pellet shrinkage, matrix depletion, and upregulation of matrix-degrading enzymes (MMP-1, MMP-3, MMP-13, ADAMTS-4), while suppressing matrix synthesis markers (COL2A1, COL1A1), highlighting their cooperative catabolic effects. Co-treatment with phytochemicals conferred differential protection: Brazilin and Diacerein most consistently preserved pellet size, reduced matrix-degrading gene expression, and attenuated pro-MMP-13 secretion. Resveratrol restored histological matrix density but failed to suppress pro-MMP-13 secretion. Notably, no phytochemical fully restored COL2A1 expression under galectin-induced stress.
Conclusions:
Our study identifies Brazilin, Diacerein, and Resveratrol as promising modulators of galectin-driven cartilage degeneration and demonstrates the translational potential of patient-derived chondrogenic pellets as a human-relevant platform for preclinical drug evaluation in OA. The 3D culture effectively recapitulates key aspects of OA pathophysiology and offers a robust system to advance therapeutic discovery targeting ECM remodeling.
Insights
This study explored how galectins drive osteoarthritis (OA) cartilage damage using 3D models. Brazilin, Diacerein, and Resveratrol showed potential in protecting against galectin-induced degeneration.
Area of Science:
- Biochemistry
- Cell Biology
- Biomaterials
Background:
- Galectins exacerbate osteoarthritis (OA) pathogenesis through inflammatory and catabolic signaling.
- Targeted OA therapies are limited, necessitating novel research platforms.
- Three-dimensional (3D) models offer a promising avenue for studying human OA and evaluating interventions.
Purpose of the Study:
- To investigate galectin-induced extracellular matrix (ECM) remodeling in human OA chondrocytes using 3D pellet cultures.
- To evaluate the chondroprotective effects of various phytochemicals against galectin-driven OA pathology.
- To assess the utility of patient-derived 3D chondrogenic pellets as a preclinical model for OA drug discovery.
Main Methods:
- Established 3D pellet cultures from human OA chondrocytes.
- Stimulated pellets with specific galectins (Gal-1, -3, -4, -8) or a mixture.
- Assessed phytochemical co-treatments (Brazilin, Diacerein, Quercetin, Resveratrol, ASU) via morphological, histological, biochemical, and gene expression analyses.
Main Results:
- Galectins induced significant pellet shrinkage and ECM depletion, upregulating matrix-degrading enzymes (MMP-1, -3, -13, ADAMTS-4) and downregulating matrix synthesis markers (COL2A1, COL1A1).
- Brazilin and Diacerein demonstrated the most consistent chondroprotection, preserving pellet size and reducing catabolic gene expression and pro-MMP-13 secretion.
- Resveratrol improved matrix density but did not fully suppress pro-MMP-13; no phytochemical restored COL2A1 expression under galectin stress.
Conclusions:
- Brazilin, Diacerein, and Resveratrol are identified as promising agents modulating galectin-driven cartilage degeneration in OA.
- Patient-derived 3D chondrogenic pellets serve as a valuable, human-relevant platform for preclinical OA drug evaluation.
- This 3D culture system effectively models OA pathophysiology, advancing therapeutic discovery for ECM remodeling.
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