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Human wild type p53 inhibits cell proliferation and elicits dramatic morphological changes in human glioma cell lines
A Merzak1, S Raynal, J P Rogers
1Department of Neuropathology, Institute of Psychiatry, Denmark Hill, London, UK.
Abstract:
A human pilocytic astrocytoma-derived cell line, a grade III astrocytoma-derived cell line, and a glioblastoma-derived cell line were transfected with the human wild-type p53 gene, in order to demonstrate the possible suppressor role of this gene in low grade as well as in high grade human astrocytomas. p53 exhibited a strong growth suppressor effect on the three cell lines studied, irrespective of the grade of malignancy of the tumours from which they originate. Furthermore, the p53 gene elicited important morphological changes in these cell lines. p53-Transfected cells displayed a flat morphology, a large cell body, and a stellate shape with long processes, characteristic of differentiated astrocytes. In addition, the growth inhibitory effect of p53 was found not to be due to induction of apoptosis. These results indicate that p53 plays a tumour suppressor role in low grade and high grade human astrocytomas and raise the possibility of the involvement of p53 in glioma cell differentiation in vitro.
Insights
The wild-type p53 gene suppressed growth and induced differentiation in human astrocytoma cell lines, regardless of tumor grade. This indicates p53
Area of Science:
- Neuro-oncology
- Molecular Biology
- Cell Biology
Background:
- Astrocytomas are primary brain tumors with varying grades of malignancy.
- The p53 gene is a critical tumor suppressor, but its role in astrocytomas of different grades requires further elucidation.
- Understanding p53's function is crucial for developing targeted therapies for brain tumors.
Purpose of the Study:
- To investigate the tumor suppressor role of the wild-type p53 gene in human astrocytoma cell lines of varying grades.
- To determine if p53 influences cell morphology and differentiation in these cell lines.
- To assess the mechanism of p53-mediated growth inhibition, specifically whether it involves apoptosis.
Main Methods:
- Transfection of pilocytic astrocytoma, grade III astrocytoma, and glioblastoma cell lines with the human wild-type p53 gene.
- Assessment of cell growth inhibition and morphological changes post-transfection.
- Analysis to determine if growth inhibition was mediated by apoptosis induction.
Main Results:
- The p53 gene demonstrated a significant growth suppressor effect across all tested astrocytoma cell lines, irrespective of their grade.
- p53 transfection induced notable morphological alterations, promoting a differentiated astrocyte phenotype (flat, large cell body, stellate shape with long processes).
- The observed growth inhibition by p53 was not attributed to the induction of apoptosis.
Conclusions:
- The p53 gene functions as a tumor suppressor in both low-grade and high-grade human astrocytomas.
- p53 may play a role in promoting glioma cell differentiation in vitro.
- These findings highlight the therapeutic potential of p53 in managing astrocytomas.