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Detection of altered retinoic acid receptor expression in tissue sections using in situ hybridization
1Department of Clinical Cancer Prevention, The University of Texas M.D. Anderson Cancer Center, Houston 77030, USA. xxu@mdanderson.org
Abstract:
Nuclear retinoid receptors mediate retinoid effects in controlling cell growth, differentiation, apoptosis, and carcinogenesis. Altered expression or activity of these receptors could abolish the retinoid signal transduction pathway and be associated with human carcinogenesis. In situ hybridization is a powerful tool for analyzing gene expression in formalin-fixed, paraffin-embedded tissue sections, especially for newly cloned genes or when no antibodies are available. Detection of altered retinoid receptor expression using in situ hybridization in premalignant and malignant tissues has provided important information about the roles of these receptors in cancer development and the response of these tissues to retinoid treatment. Among these receptors, altered expression of retinoic acid receptor-beta (RAR-beta) has been mostly detected in human cancers, including those of the head and neck, lung, esophagus, mammary gland, pancreas, and cervix. RAR-beta is thus currently used as a surrogate endpoint biomarker in different clinical prevention trials of various cancers.
Insights
Altered expression of nuclear retinoid receptors, particularly retinoic acid receptor-beta (RAR-beta), is linked to human cancers. In situ hybridization reveals RAR-beta
Area of Science:
- Molecular biology
- Oncology
- Cell biology
Background:
- Nuclear retinoid receptors regulate critical cellular processes including growth, differentiation, apoptosis, and carcinogenesis.
- Dysregulation of retinoid receptor signaling pathways is implicated in human cancer development.
- Retinoid receptors play a crucial role in mediating cellular responses to retinoids.
Purpose of the Study:
- To investigate the role of nuclear retinoid receptors, specifically retinoic acid receptor-beta (RAR-beta), in human carcinogenesis.
- To highlight the utility of in situ hybridization for analyzing gene expression in tissue samples for cancer research.
- To establish RAR-beta as a potential biomarker in cancer prevention and treatment.
Main Methods:
- Utilizing in situ hybridization to analyze gene expression patterns in formalin-fixed, paraffin-embedded tissue sections.
- Examining altered expression of retinoid receptors in premalignant and malignant tissues.
- Focusing on the detection of retinoic acid receptor-beta (RAR-beta) expression changes.
Main Results:
- Altered expression of nuclear retinoid receptors is associated with the abolition of the retinoid signal transduction pathway.
- In situ hybridization provides valuable insights into retinoid receptor roles in cancer development and retinoid treatment response.
- Most notably, altered expression of retinoic acid receptor-beta (RAR-beta) has been frequently observed in various human cancers.
Conclusions:
- Nuclear retinoid receptors are critical in cell regulation and their altered expression contributes to carcinogenesis.
- In situ hybridization is an effective method for studying gene expression in cancer tissues, especially for novel genes or when antibodies are unavailable.
- Retinoic acid receptor-beta (RAR-beta) exhibits altered expression across multiple human cancers and serves as a valuable surrogate endpoint biomarker in clinical cancer prevention trials.