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Updated: May 24, 2026
Software-Assisted Quantitative Measurement of Osteoarthritic Subchondral Bone Thickness
Published on: March 18, 2022
Interruption of glycosphingolipid synthesis enhances osteoarthritis development in mice
Naoki Seito1, Tadashi Yamashita, Yukinori Tsukuda
1Hokkaido University, Sapporo, Japan.
Objective:
Glycosphingolipids (GSLs) are ubiquitous membrane components that modulate transmembrane signaling and mediate cell-to-cell and cell-to-matrix interactions. GSL expression is decreased in the articular cartilage of humans with osteoarthritis (OA). This study was undertaken to determine the functional role of GSLs in cartilage metabolism related to OA pathogenesis in mice.
Methods:
We generated mice with knockout of the chondrocyte-specific Ugcg gene, which encodes an initial enzyme of major GSL synthesis, using the Cre/loxP system (Col2-Ugcg(-/-) mice). In vivo OA and in vitro cartilage degradation models were used to evaluate the effect of GSLs on the cartilage degradation process.
Results:
Although Col2-Ugcg(-/-) mice developed and grew normally, OA changes in these mice were dramatically enhanced with aging, through the overexpression of matrix metalloproteinase 13 and chondrocyte apoptosis, compared to their wild-type (WT) littermates. Col2-Ugcg(-/-) mice showed more severe instability-induced pathologic OA in vivo and interleukin-1α (IL-1α)-induced cartilage degradation in vitro. IL-1α stimulation of chondrocytes from WT mice significantly increased Ugcg messenger RNA expression and up-regulated GSL metabolism.
Conclusion:
Our results indicate that GSL deficiency in mouse chondrocytes enhances the development of OA. However, this deficiency does not affect the development and organization of cartilage tissue in mice at a young age. These findings indicate that GSLs maintain cartilage molecular metabolism and prevent disease progression, although GSLs are not essential for chondrogenesis of progenitor and stem cells and cartilage development in young mice. GSL metabolism in the cartilage is a potential target for developing a novel treatment for OA.
Insights
Glycosphingolipid (GSL) deficiency in mouse cartilage accelerates osteoarthritis (OA) development and progression. GSLs are crucial for maintaining cartilage health and preventing OA, making GSL metabolism a potential therapeutic target.
Area of Science:
- Biochemistry
- Cell Biology
- Orthopedics
Background:
- Glycosphingolipids (GSLs) are vital membrane components involved in cell signaling and interactions.
- Reduced GSL expression is observed in human osteoarthritis (OA) cartilage.
Purpose of the Study:
- To investigate the functional role of GSLs in cartilage metabolism concerning OA pathogenesis in mice.
- To determine if GSL deficiency impacts cartilage degradation and OA development.
Main Methods:
- Generated chondrocyte-specific GSL synthesis knockout mice (Col2-Ugcg(-/-)) using the Cre/loxP system.
- Utilized in vivo OA models and in vitro cartilage degradation assays to assess GSL function.
Main Results:
- Col2-Ugcg(-/-) mice exhibited accelerated OA, increased matrix metalloproteinase 13, and chondrocyte apoptosis with aging.
- GSL-deficient mice showed more severe instability-induced OA and interleukin-1α (IL-1α)-induced cartilage degradation.
- IL-1α stimulated Ugcg expression and GSL metabolism in wild-type chondrocytes.
Conclusions:
- GSL deficiency in chondrocytes exacerbates OA development in mice.
- GSLs are essential for maintaining cartilage molecular metabolism and preventing OA progression.
- GSL metabolism represents a promising therapeutic target for OA treatment.
