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Updated: Jun 22, 2026
Stimulation of Notch Signaling in Mouse Osteoclast Precursors
Published on: February 28, 2017
Expression of Notch family members in cultured murine articular chondrocytes
Abstract:
The Notch family is involved in cell differentiation during embryogenesis. Osteoarthritic chondrocytes undergo morphological and biochemical changes leading to the de-differentiation process. In the study reported here, we were interested in the involvement of the Notch pathway in murine articular chondrocyte de-differentiation. Articular chondrocytes were subjected to several cell culture passages and treated with or without a Notch inhibitor, N-[N-(3, 5-difluorophenacetyl-L-alanyl)]-S-phenylglycine t-Butyl Ester (DAPT). Chondrocyte morphology was studied using optical microscopy. Immunocytochemistry and immunoblot were performed to study the expression of collagens and Notch family members. Without DAPT treatment, chondrocyte de-differentiation resulted in fibroblast-like morphology. This was confirmed by immunocytochemical staining and immunoblot analysis, which showed an increase in collagen type I (col I) and a decrease in collagen type II (col II) expression. With DAPT treatment, de-differentiation was delayed. Immunocytochemistry and immunoblot analysis showed during the first passages inhibition of col II expression, which then was re-instituted during the last passage, suggesting chondrocyte re-differentiation. In the study reported here, we showed that inhibition of the Notch receptor not only delayed the de-differentiation process, but also chondrocyte re-differentiation, which confirms the involvement of the Notch pathway in chondrocyte de-differentiation.
Insights
The Notch pathway influences chondrocyte differentiation. Inhibiting Notch signaling with DAPT delayed de-differentiation and promoted re-differentiation in murine articular chondrocytes, highlighting Notch
Area of Science:
- Cell Biology
- Developmental Biology
- Biochemistry
Background:
- The Notch signaling pathway is crucial for cell differentiation during embryonic development.
- Osteoarthritis involves chondrocyte de-differentiation, characterized by morphological and biochemical alterations.
Purpose of the Study:
- To investigate the role of the Notch pathway in the de-differentiation of murine articular chondrocytes.
- To determine the effect of Notch inhibition on chondrocyte de-differentiation and re-differentiation.
Main Methods:
- Murine articular chondrocytes were cultured through multiple passages.
- Cells were treated with or without the Notch inhibitor DAPT (N-[N-(3, 5-difluorophenacetyl-L-alanyl)]-S-phenylglycine t-Butyl Ester).
- Chondrocyte morphology, collagen type I (col I) and type II (col II) expression, and Notch family member expression were analyzed using optical microscopy, immunocytochemistry, and immunoblotting.
Main Results:
- Untreated chondrocytes exhibited fibroblast-like morphology and increased col I/decreased col II expression, indicative of de-differentiation.
- DAPT treatment delayed chondrocyte de-differentiation.
- DAPT treatment initially inhibited col II expression but led to its re-institution in later passages, suggesting a role in re-differentiation.
Conclusions:
- The Notch pathway is involved in regulating chondrocyte de-differentiation.
- Notch receptor inhibition can delay de-differentiation and potentially promote chondrocyte re-differentiation, offering insights into osteoarthritis pathogenesis.
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