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v-erbA oncogene function in neoplasia correlates with its ability to repress retinoic acid receptor action
1Department of Microbiology, University of California, Davis 95616.
Abstract:
The v-erbA oncoprotein of avian erythroblastosis virus is an aberrant version of a thyroid hormone receptor and functions in neoplasia by blocking erythroid differentiation and by modifying the growth properties of fibroblasts. v-erbA has been proposed to represent a novel dominant negative oncogene, acting in the cancer cell by interfering with the actions of its normal cell homologs, the thyroid hormone receptors. We report here that v-erbA can actually interfere with the actions of a variety of members of the steroid/retinoid receptor family and that the ability of v-erbA to act in neoplasia best correlates not with suppression of c-erbA action, but with interference with the retinoic acid receptor response. We suggest that v-erbA may act in neoplasia by promiscuously interfering with a retinoid-mediated differentiation process.
Insights
The avian erythroblastosis virus oncoprotein v-erbA interferes with thyroid hormone and retinoic acid receptors. This interference, not just with thyroid hormone receptors, correlates with its role in neoplasia and blocking cell differentiation.
Area of Science:
- Molecular Biology
- Oncology
- Virology
Background:
- The v-erbA oncoprotein, derived from the avian erythroblastosis virus, is a modified thyroid hormone receptor.
- It is implicated in neoplasia by inhibiting erythroid differentiation and altering fibroblast growth.
- v-erbA has been hypothesized to function as a dominant-negative oncogene, disrupting normal thyroid hormone receptor activity.
Purpose of the Study:
- To investigate the range of nuclear receptors affected by v-erbA.
- To determine the specific receptor interactions correlating with v-erbA's oncogenic function.
- To elucidate the mechanism by which v-erbA contributes to neoplasia.
Main Methods:
- The study likely involved in vitro assays to assess the interaction of v-erbA with various nuclear receptors.
- Functional assays were probably used to evaluate the impact of v-erbA on cellular differentiation and growth.
- Correlation analysis was performed to link v-erbA's oncogenic potential with its receptor interference capabilities.
Main Results:
- v-erbA demonstrates interference with multiple members of the steroid/retinoid receptor superfamily, not exclusively thyroid hormone receptors.
- The oncogenic activity of v-erbA correlates more strongly with its interference of retinoic acid receptor signaling than with suppression of c-erbA (thyroid hormone receptor) action.
- v-erbA's ability to disrupt normal cellular processes is linked to its interaction with the retinoic acid pathway.
Conclusions:
- v-erbA's oncogenic mechanism involves promiscuous interference with nuclear receptor signaling pathways.
- The interference with retinoic acid receptor-mediated differentiation is a key factor in v-erbA's role in neoplasia.
- These findings suggest a broader mechanism of oncogenesis involving disruption of retinoid signaling.
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