Thyrotropin receptor: a role for thyroid tumourigenesis?

Area of Science:

• Endocrinology
• Oncology
• Molecular Biology

Background:

• Thyroid tumours involve genetic and non-genetic factors in carcinogenesis.
• Genetic abnormalities in the Thyrotropin receptor (TSH-R) cAMP regulatory cascade are implicated in thyroid neoplasia.
• Activating mutations in TSH-R and Gs alpha protein genes are found in toxic adenoma, suggesting a role in constitutive cAMP pathway activation.

Purpose of the Study:

• To review the role of Thyrotropin receptor (TSH-R) gene alterations in benign and malignant thyroid neoplasia.
• To examine the hypothesis that genetic alterations in the TSH-R pathway play a causative role in thyroid disease.
• To discuss recent observations and the current understanding of TSH-R gene mutations in thyroid tumours.

Main Methods:

• Review of existing literature on genetic alterations in thyroid tumours.
• Analysis of studies investigating mutations in the TSH-R gene and Gs alpha protein gene.
• Examination of the association between TSH-R mutations and cAMP pathway activity in thyroid neoplasia.

Main Results:

• Activating mutations in the TSH-R gene and Gs alpha protein gene have been identified in thyroid toxic adenoma.
• These mutations lead to constitutive activation of the cAMP pathway.
• Activating TSH-R mutations are also found in differentiated thyroid carcinomas, though at a low percentage in unselected series.

Conclusions:

• While TSH-R gene mutations are present in thyroid tumours, their causative role requires further investigation.
• The TSH-R-related cAMP pathway alterations' role in thyroid transformation remains to be fully elucidated.
• TSH-R gene alterations are a significant area of study in both benign and malignant thyroid neoplasia.