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Related Experiment Videos

H-RAS gene expression in human multinodular goiter.

L Golbert1, J H G Kolling, A H Leitão

  • 1Endocrine Division, Hospital de Clínicas de Porto Alegre, Federal University of Rio Grande do Sul, Brazil.

Histology and Histopathology
|February 10, 2007
PubMed
Summary

Increased H-RAS protooncogene mRNA and protein were found in nontoxic multinodular goiter, suggesting its role in pathogenesis. H-RAS was not overexpressed in toxic multinodular goiters, indicating different mechanisms.

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Area of Science:

  • Endocrinology
  • Molecular Biology
  • Oncology

Background:

  • The RAS protooncogene plays a role in neoplasia, but its function in thyroid neoplasia is not fully established.
  • Thyroid nodular goiters can be classified as toxic or nontoxic, potentially involving different molecular mechanisms.

Purpose of the Study:

  • To evaluate H-RAS mRNA and protein levels in human nontoxic and toxic multinodular goiter samples.
  • To investigate the correlation between H-RAS expression and thyroid status (serum TSH levels).

Main Methods:

  • Quantitative analysis of H-RAS mRNA and protein expression in human thyroid tissue samples.
  • Comparison of H-RAS levels between nodular and nonnodular tissues in nontoxic and toxic multinodular goiters.
  • Correlation analysis between H-RAS expression and thyroglobulin expression.

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Main Results:

  • Significantly increased H-RAS mRNA levels were observed in nontoxic multinodular goiter nodules compared to nonnodular tissue (P=0.016).
  • Approximately 50% of nontoxic multinodular goiter specimens showed increased H-RAS mRNA, paralleled by increased protein levels in 90% of cases.
  • No significant differences in H-RAS expression were found in toxic multinodular goiters, and none exhibited H-RAS overexpression. H-RAS expression correlated positively with thyroglobulin (r2=0.51; P=0.04).

Conclusions:

  • Increased H-RAS mRNA and protein levels in nontoxic multinodular goiter suggest its involvement in goiter pathogenesis.
  • The absence of H-RAS overexpression in toxic multinodular goiter indicates distinct molecular pathways in thyroid nodular disease based on thyroid status.