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Distinct regulation of intrinsic apoptosis in benign and malignant thyroid tumours

C Weidinger1, S Karger, K Krause

  • 1Department of Internal Medicine, Division of Endocrinology and Diabetes, University of Leipzig, Leipzig, Germany.

Hormone and Metabolic Research = Hormon- Und Stoffwechselforschung = Hormones Et Metabolisme
|May 7, 2010
PubMed

Insights

Thyroid cancer involves apoptosis control issues. This study found key apoptosis pathway genes, Bad and Caspase3, are deregulated in thyroid tumors, impacting cancer development.

Area of Science:

  • Molecular Biology
  • Oncology
  • Cell Death Research

Background:

  • Apoptosis control is crucial in thyroid carcinogenesis.
  • Regulation of the intrinsic apoptosis pathway in thyroid tissue is poorly understood.

Purpose of the Study:

  • Investigate mRNA expression of apoptosis-related genes in thyroid tumors.
  • Assess the activation status of Caspase3 in thyroid malignancies.
  • Identify transcriptional and post-transcriptional changes in apoptosis pathways during thyroid cancer development.

Main Methods:

  • Real-time PCR to quantify mRNA levels of Caspase3, Caspase3 s, xIAP, Bad, and beta-actin in 79 thyroid tumors.
  • Immunohistochemistry to evaluate Caspase3 activation status.

Main Results:

  • Significant downregulation of pro-apoptotic Bad mRNA in malignant thyroid tumors.
  • Upregulation of anti-apoptotic Caspase3 s splice variant in follicular and anaplastic thyroid cancers.
  • Papillary thyroid tumors showed increased Caspase3 mRNA levels.
  • Impaired Caspase3 activation in thyroid malignancies, with cytoplasmic accumulation of activated Caspase3.

Conclusions:

  • First evidence of intrinsic apoptosis pathway deregulation at transcriptional and post-transcriptional levels in thyroid cancer.
  • Altered expression of Bad and Caspase3 variants suggests their role in thyroid carcinogenesis.
  • Understanding apoptosis deregulation may offer diagnostic and therapeutic advantages for thyroid cancer management.

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