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MCAM knockdown impairs PPARγ expression and 3T3-L1 fibroblasts differentiation to adipocytes
Matías Gabrielli1,2, Damián G Romero3, Claudia N Martini1
1Departamento de Química Biológica, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Pabellón 2, Ciudad Universitaria, 1428, Buenos Aires, Argentina.
Abstract:
We investigated for the first time the expression of melanoma cell adhesion molecule (MCAM) and its involvement in the differentiation of 3T3-L1 fibroblasts to adipocytes. We found that MCAM mRNA increased subsequent to the activation of the master regulator of adipogenesis, PPARγ, and this increase was maintained in the mature adipocytes. On the other hand, MCAM knockdown impaired differentiation and induction of PPARγ as well as expression of genes activated by PPARγ. However, events that precede and are necessary for early PPARγ activation, such as C/EBPβ induction, β-catenin downregulation, and ERK activation, were not affected in the MCAM knockdown cells. In keeping with this, the increase in PPARγ mRNA that precedes MCAM induction was not altered in the knockdown cells. In conclusion, our findings suggest that MCAM is a gene upregulated and involved in maintaining PPARγ induction in the late but not in the early stages of 3T3-L1 fibroblasts adipogenesis.
Insights
Melanoma cell adhesion molecule (MCAM) is upregulated during adipogenesis. MCAM supports later stages of fat cell differentiation by maintaining PPARγ induction, but not early steps.
Area of Science:
- Cell Biology
- Molecular Biology
- Biochemistry
Background:
- Adipogenesis is a complex process involving coordinated gene expression changes.
- Melanoma cell adhesion molecule (MCAM) function in adipogenesis is largely unexplored.
- PPARγ is a master regulator of adipocyte differentiation.
Purpose of the Study:
- To investigate the role of MCAM in 3T3-L1 fibroblast differentiation into adipocytes.
- To determine the temporal relationship between MCAM expression and adipogenesis regulators.
Main Methods:
- MCAM expression analysis during 3T3-L1 adipogenesis.
- MCAM knockdown using siRNA in 3T3-L1 cells.
- Quantitative PCR to assess gene expression (PPARγ, C/EBPβ, and PPARγ-target genes).
- Western blotting for ERK activation and β-catenin levels.
Main Results:
- MCAM mRNA levels increased following PPARγ activation and were sustained in mature adipocytes.
- MCAM knockdown inhibited adipocyte differentiation and PPARγ induction.
- Early adipogenesis events (C/EBPβ induction, β-catenin downregulation, ERK activation) were unaffected by MCAM knockdown.
- PPARγ mRNA increase preceding MCAM induction was unaltered in MCAM knockdown cells.
Conclusions:
- MCAM is upregulated during late-stage adipogenesis.
- MCAM plays a crucial role in maintaining PPARγ induction during the later phases of adipogenesis.
- MCAM is not involved in the early signaling events of adipocyte differentiation.
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