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Conformation changes of p53 proteins in regulation of murine T lymphocyte proliferation
Abstract:
This report shows that p53 gene expression is required for proliferation of Concanavalin A (ConA)-stimulated murine T lymphocytes. p53 gene-specific antisense oligodeoxynucleotides strongly inhibited expression of p53 gene in T lymphocytes, causing suppression of ConA-induced cell proliferation. In contrast, the complementary-sense oligomers had no inhibitory effects. Northern and immunoprecipitation-blotting assay data, however, showed no change in p53 mRNA and proteins synthesized in T lymphocytes before and after ConA stimulation. p53 proteins in the resting and ConA-stimulated T cells had different immunoreactivity with specific monoclonal antibodies. p53 from resting T cells only reacted with "wild-type form" p53-specific monoclonal antibody (PAb246); whereas, p53 from ConA-stimulated T cells was recognized by "mutant-form" p53-specific monoclonal antibody (PAb421). These results suggest that the conformation of p53 proteins in resting and ConA-stimulated T cells are different. The p53 conformation changes may be related to the regulation of murine T lymphocyte proliferation.
Insights
p53 gene expression is crucial for T lymphocyte proliferation. Inhibiting p53 with antisense oligodeoxynucleotides suppressed Concanavalin A-induced proliferation, indicating p53
Area of Science:
- Immunology
- Molecular Biology
- Cell Biology
Background:
- The p53 gene plays a critical role in cellular processes, including proliferation.
- T lymphocytes are key immune cells involved in adaptive immunity.
- Concanavalin A (ConA) is a common mitogen used to stimulate T lymphocytes.
Purpose of the Study:
- To investigate the role of p53 gene expression in Concanavalin A (ConA)-stimulated murine T lymphocyte proliferation.
- To determine if changes in p53 protein conformation are associated with T lymphocyte activation and proliferation.
Main Methods:
- Treatment of murine T lymphocytes with p53 gene-specific antisense oligodeoxynucleotides.
- Assessment of T lymphocyte proliferation using Concanavalin A stimulation.
- Analysis of p53 mRNA and protein levels using Northern blotting and immunoprecipitation.
- Immunoreactivity assays using monoclonal antibodies specific for wild-type (PAb246) and mutant-form (PAb421) p53.
Main Results:
- p53 gene-specific antisense oligodeoxynucleotides significantly inhibited ConA-induced T lymphocyte proliferation.
- No changes in p53 mRNA or total protein levels were observed after ConA stimulation.
- Resting T cells contained wild-type conformation p53 (recognized by PAb246), while ConA-stimulated cells contained mutant-form conformation p53 (recognized by PAb421).
Conclusions:
- p53 gene expression is essential for the proliferation of ConA-stimulated murine T lymphocytes.
- The conformation of p53 protein changes from wild-type to mutant-form upon T lymphocyte activation.
- These p53 conformation changes are likely involved in regulating murine T lymphocyte proliferation.