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A study of glucocorticoid receptors in intracranial tumors
Abstract:
Tissue samples from 20 patients with various intracranial tumors and one case of cerebral contusion were analyzed for the cytosolic glucocorticoid-receptor concentration using isoelectric focusing in slabs of polyacrylamide gel. It is pointed out that the clinical response to dexamethasone in brain edema associated with various intracranial lesions is, to some extent, parallel to the glucocorticoid-receptor concentration in these tumors. The findings in this investigation suggest that the cytosolic glucocorticoid receptor might be responsible for the initiation of a series of biochemical effects of steroids affecting brain edema. It is possible that the first step in eliciting a beneficial clinical response to dexamethasone in patients with brain tumors is the formation of a steroid-receptor complex in the peripheral parts of the tumor.
Insights
This study found that higher cytosolic glucocorticoid receptor concentrations in brain tumors correlate with better clinical response to dexamethasone treatment for brain edema. This suggests the receptor is key to steroid effectiveness.
Area of Science:
- Neuroscience
- Oncology
- Pharmacology
Background:
- Brain edema is a serious complication of intracranial tumors.
- Dexamethasone is a corticosteroid used to treat brain edema.
- The mechanism of dexamethasone's efficacy in brain tumors is not fully understood.
Purpose of the Study:
- To investigate the relationship between cytosolic glucocorticoid receptor concentration and clinical response to dexamethasone in patients with intracranial tumors.
- To explore the role of the cytosolic glucocorticoid receptor in mediating the effects of steroids on brain edema.
Main Methods:
- Analysis of cytosolic glucocorticoid receptor concentration in tissue samples from 20 patients with intracranial tumors and one case of cerebral contusion.
- Isoelectric focusing in polyacrylamide gel slabs was used for receptor concentration analysis.
Main Results:
- A correlation was observed between cytosolic glucocorticoid receptor concentration and the clinical response to dexamethasone in brain edema.
- Tumor glucocorticoid receptor levels appear to influence treatment outcomes.
Conclusions:
- The cytosolic glucocorticoid receptor may initiate biochemical effects of steroids that impact brain edema.
- Formation of a steroid-receptor complex in tumor periphery might be the initial step for dexamethasone's therapeutic effect in brain tumors.