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Related Experiment Videos

Serum activin A levels in different thyroid disorders.

Paola S Morpurgo1, Paolo Beck-Peccoz, Eugenio Reschini

  • 1Institute of Endocrine Sciences, University of Milano, Milan, Italy.

Thyroid : Official Journal of the American Thyroid Association
|February 21, 2003
PubMed
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Serum activin A levels increase with thyroid hyperplasia and hyperfunction, suggesting a counteracting mechanism. The thyroid gland is not the primary source of activin A in normal conditions.

Area of Science:

  • Endocrinology
  • Molecular Biology
  • Cell Biology

Background:

  • Activin A, a member of the TGF-β superfamily, influences cell proliferation and differentiation.
  • While gonadal tissue was considered the primary source, extragonadal sites, including human thyrocytes, have been identified.
  • Thyroid disorders may involve altered activin A levels.

Purpose of the Study:

  • To investigate serum activin A levels in patients with various thyroid disorders.
  • To compare activin A levels during active disease states and after recovery.
  • To determine the thyroid's contribution to systemic activin A levels.

Main Methods:

  • Serum activin A was measured using an enzyme-linked immunosorbent assay (ELISA).
  • Participants included healthy controls and patients with multinodular nontoxic goiter (MNG), Graves' disease (GD), autonomous hyperfunctioning adenoma (ATA), TSH-secreting pituitary adenoma, Hashimoto's thyroiditis, post-thyroidectomy, and resistance to thyroid hormone (RTH).

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  • Levels were assessed during active disease and after recovery.

    • Main Results:

    • Patients with Graves' disease and autonomous hyperfunctioning adenoma exhibited significantly higher serum activin A levels compared to controls.
    • Multinodular nontoxic goiter patients also showed elevated activin A levels, similar to hyperthyroid groups.
    • Serum activin A levels were comparable to controls in patients with Hashimoto's thyroiditis, post-thyroidectomy, and resistance to thyroid hormone.

    Conclusions:

    • Thyroid hyperplasia and hyperfunction are associated with increased serum activin A levels.
    • The normal levels in thyroidectomized patients indicate the thyroid is not the predominant source of activin A under normal conditions.
    • Elevated activin A in thyroid disorders may function as a counteracting mechanism against excessive thyrocyte proliferation.