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Nuclear receptor expression in human differentiated thyroid tumors.

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Nuclear receptors (NRs) show distinct expression patterns in thyroid cancers, differing between tumor types and BRAF mutation status. These findings reveal potential new therapeutic targets for endocrine malignancies.

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Area of Science:

  • Endocrinology
  • Oncology
  • Molecular Biology

Background:

  • Nuclear receptors (NRs) are crucial in endocrine signaling and metabolism.
  • NRs are key therapeutic targets for hormone-dependent cancers.
  • Limited research exists on NR roles in thyroid cancer.

Purpose of the Study:

  • Systematically examine the expression of 48 human NRs in benign and malignant thyroid tissues.
  • Investigate NR expression differences in papillary thyroid carcinoma (PTC) based on BRAF mutation status.

Main Methods:

  • Quantitative real-time PCR profiled 48 human NRs in multinodular goiter (MNG), PTC, follicular carcinoma (FC), and Hürthle cell carcinoma (HCC).
  • Immunohistochemistry (IHC) assessed protein expression of Rev-erbα and LXR-β.
  • Tissue microarrays included benign and malignant thyroid tissues.

Main Results:

  • LXR-β and ROR-γ were prominently expressed across all thyroid tissues.
  • PTC showed overexpression of RXR-γ and Rev-erbα compared to MNG.
  • BRAF(V600E) PTC exhibited altered NR expression (upregulation of RXR-γ, Rev-erbα; downregulation of AR, ERR-γ, ROR-γ) versus wild-type BRAF.
  • FC displayed EAR-2 overexpression and PPAR-α/δ underexpression.
  • HCC showed a distinct profile with widespread NR downregulation.
  • IHC confirmed Rev-erbα and LXR-β protein localization in tumor cells, with stronger Rev-erbα staining in PTC.

Conclusions:

  • This study provides the first systematic analysis of NR expression in thyroid cancer.
  • Identified tumor-specific NR expression patterns and BRAF-dependent differences in PTC.
  • These findings support further research into NR mechanisms and potential therapeutic applications in thyroid cancer.