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Comparative status of activated ERK1/2 and PARP cleavage in human gliomas
Vasanth Kumar Bhaskara1, Manas Panigrahi, Sundaram Challa
1Department of Animal Sciences, University of Hyderabad, Hyderabad, India.
Abstract:
Gliomas are the most common form of cerebral tumors. Understanding molecular features of glioma will eventually allow for targeted intervention and more promising approaches for treating gliomas. The present study is therefore carried out to check the levels of activated ERK1/2 with respect to phospho-tyrosine and cleavage of poly ADP-ribose polymerase (PARP). Recent experiments support that extracellular signal regulated kinase (ERK), a mitogen activated protein (MAP) kinase might have a critical role in cell proliferation. PARP is a DNA-repair enzyme activated by DNA strand breaks. Overactivation of PARP after cellular insult lead to cell death caused by rapid depletion of cellular ATP. Three glioblastoma multiforme (GBM) and two astrocytoma biopsies (core tumor) and peripheral tissues were analyzed for the expression of p-ERK1/2 and PARP. Results indicate higher p-ERK1/2 in GBM. Cleaved fragments of PARP (89 kDa) were found to be more in core tumor tissue samples as compared to peripheral tumor tissues of both astrocytoma and GBM.
Insights
This study investigated molecular markers in brain tumors. Higher levels of activated extracellular signal regulated kinase (ERK) and cleaved poly ADP-ribose polymerase (PARP) were found in core tumor tissues, suggesting their role in glioma progression.
Area of Science:
- Neuro-oncology
- Molecular Biology
- Cancer Research
Background:
- Gliomas represent the most prevalent type of brain tumors.
- Understanding glioma molecular characteristics is crucial for developing targeted therapies.
- Extracellular signal-regulated kinase (ERK) and poly ADP-ribose polymerase (PARP) are implicated in cell proliferation and DNA repair, respectively.
Purpose of the Study:
- To assess the levels of activated ERK1/2 (p-ERK1/2) and cleaved poly ADP-ribose polymerase (PARP) in glioma tissues.
- To correlate these molecular markers with tumor type and location (core vs. peripheral).
Main Methods:
- Analysis of p-ERK1/2 and PARP expression in three glioblastoma multiforme (GBM) and two astrocytoma biopsies.
- Comparison of marker expression between core tumor tissues and peripheral tissues.
Main Results:
- Elevated levels of p-ERK1/2 were observed in GBM samples.
- Increased presence of cleaved PARP fragments (89 kDa) was detected in core tumor tissues compared to peripheral tissues for both astrocytoma and GBM.
Conclusions:
- The findings suggest a role for activated ERK1/2 and cleaved PARP in the progression of gliomas.
- These molecular markers may serve as potential targets for future glioma interventions.
