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C-Fos is not essential for apoptosis
C Gajate1, M T Alonso, T Schimmang
1Instituto de Biología y Genética Molecular, Facultad de Medicina, Universidad de Valladolid-Consejo Superior de Investigaciones Científicas, Valladolid, Spain.
Abstract:
The transcription factor AP-1, made up of dimers of Fos and Jun proto-oncogene products, is involved in distinct cellular processes, including cell proliferation, differentiation and apoptosis. In this study, we have used mice in which both copies of the c-fos gene were disrupted by targeted mutagenesis in order to analyze how the apoptotic response was affected in these mice. We prepared primary cultures from the lymphoid organs, spleen and thymus, obtained from both wild-type and c-fos -/- mice and analyzed the induction of apoptosis in these cultures in the absence and presence of etoposide, an inducer of apoptosis in distinct cell types. Primary cultures from both organs, spleen and thymus, isolated from wild-type mice underwent apoptosis after 3 and 6 h of culture, respectively. Addition of etoposide enhanced the apoptotic response and c-fos mRNA levels in both spleen and thymic cells. Nevertheless, we found that induction of apoptosis in primary cultures of cells obtained from spleen and thymus of c-Fos-deficient mice was practically identical to that observed in wild-type mice. These results demonstrate that c-Fos is not essential for apoptosis and that cells lacking c-Fos may undergo normal apoptosis.
Insights
The transcription factor c-Fos is not essential for apoptosis. Mice lacking c-Fos exhibit normal apoptotic responses in lymphoid cells, indicating its non-critical role in this cellular process.
Area of Science:
- Molecular Biology
- Cell Biology
- Immunology
Background:
- The transcription factor AP-1, a dimer of Fos and Jun proteins, regulates key cellular processes like proliferation, differentiation, and apoptosis.
- Understanding the specific role of c-Fos in apoptosis is crucial for comprehending cellular fate regulation.
Purpose of the Study:
- To investigate the necessity of the c-Fos gene in the apoptotic response.
- To analyze the impact of c-Fos deficiency on apoptosis induction in primary lymphoid cells.
Main Methods:
- Generation of c-Fos-deficient mice using targeted mutagenesis.
- Preparation of primary cell cultures from spleen and thymus of wild-type and c-Fos -/- mice.
- Induction of apoptosis using etoposide and analysis of apoptotic response and c-fos mRNA levels.
Main Results:
- Primary spleen and thymus cultures from wild-type mice showed apoptosis after 3 and 6 hours, respectively.
- Etoposide treatment enhanced apoptosis and c-fos mRNA levels in wild-type cells.
- Apoptosis induction in c-Fos-deficient mice's primary cultures was comparable to wild-type controls.
Conclusions:
- c-Fos is not essential for the induction of apoptosis in primary lymphoid cells.
- Cells lacking c-Fos can undergo normal apoptotic processes, suggesting functional redundancy or alternative pathways.