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Is receptor profiling useful for predicting pituitary therapy?
Monica Marazuela1, Ana M Ramos-Leví1, Patricia Borges de Souza2
1Department of Endocrinology, Hospital Universitario La Princesa, Instituto de Investigación Princesa, Universidad Autónoma de Madrid, Madrid, Spain.
Abstract:
Medical treatment of pituitary tumours may present important challenges in the presence of resistance to first line therapy. In this setting, the availability of specific markers of responsiveness/resistance could be helpful to provide tailored patients' treatment. Pituitary receptor profiling has emerged as a potentially useful tool for predicting the response to specific pituitary-directed medical therapy, mainly somatostatin analogues and dopamine agonists. However, its utility is not always straightforward. In fact, agonist-receptor coupling to the consequent biological response is complex and sometimes jeopardizes the understanding of the molecular basis of pharmacological resistance. Defective expression of pituitary receptors, genetic alterations, truncated variants, impaired signal transduction or involvement of other proteins, such as cytoskeleton proteins or the Aryl hydrocarbon receptor interacting protein amongst others, have been linked to differential tumour phenotype or treatment responsiveness with conflicting results, keeping the debate on the utility of pituitary receptor profiling open. Why does this occur? How can we overcome the difficulties? Is there a true role for pituitary receptor profiling in the near future? All authors of this debate article agree on the need of prospective studies using standardized methods in order to assess the efficacy of receptor profiling as a reliable clinical predictive factor.
Insights
Predicting pituitary tumor treatment response is challenging. Pituitary receptor profiling shows promise but requires standardized prospective studies to confirm its clinical utility for personalized therapy.
Area of Science:
- Endocrinology
- Oncology
- Molecular Biology
Background:
- Medical treatment of pituitary tumors faces challenges due to resistance to first-line therapies.
- Identifying markers for treatment responsiveness/resistance is crucial for personalized patient management.
- Pituitary receptor profiling is explored for predicting responses to somatostatin analogues and dopamine agonists.
Purpose of the Study:
- To evaluate the utility and challenges of pituitary receptor profiling in predicting treatment response for pituitary tumors.
- To discuss the complexities of agonist-receptor coupling and its impact on understanding pharmacological resistance.
- To address the ongoing debate regarding the clinical role of pituitary receptor profiling.
Main Methods:
- Review and discussion of existing literature on pituitary receptor profiling.
- Analysis of factors contributing to pharmacological resistance, including receptor expression, genetic alterations, and signaling pathways.
- Exploration of the role of associated proteins (e.g., cytoskeleton, Aryl hydrocarbon receptor interacting protein) in treatment outcomes.
Main Results:
- Pituitary receptor profiling's utility is complex and not always straightforward due to intricate agonist-receptor interactions.
- Conflicting results exist regarding the link between receptor expression, genetic factors, and treatment responsiveness.
- Several molecular mechanisms, including defective receptor expression and altered signaling, contribute to variable treatment outcomes.
Conclusions:
- The clinical utility of pituitary receptor profiling as a predictive factor for pituitary tumor treatment remains debated.
- Further research is needed to overcome current difficulties in interpreting receptor profiling data.
- Prospective studies employing standardized methods are essential to establish the efficacy of receptor profiling in clinical practice.
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