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Immunoreactive atrial natriuretic peptide in the thyroid gland.
1Department of Medicine, Uniformed Services University of Health Sciences, Bethesda, MD 20814-4799.
Regulatory Peptides
|March 5, 1990
Summary
Human thyroid cells contain atrial natriuretic peptide (ANP), a peptide hormone. Its presence suggests separate control mechanisms from thyroid hormones, with catecholamines potentially regulating its release.
Area of Science:
- Endocrinology
- Cell Biology
- Immunohistochemistry
Background:
- Atrial natriuretic peptide (ANP) is a hormone primarily known for its role in cardiovascular regulation.
- The presence and function of ANP in non-cardiac tissues, such as the thyroid, are less understood.
Purpose of the Study:
- To investigate the presence and localization of atrial natriuretic peptide (ANP)-like immunoreactivity in human thyroid tissue and cultured follicular cells.
- To explore the potential regulation of ANP by thyroid stimulating hormone (TSH) and catecholamines in thyroid cells.
Main Methods:
- Immunohistochemical staining of human thyroid sections and primary cell cultures using a monoclonal antibody against rat alpha-ANP.
- Microscopic analysis of immunoreactive ANP (ir-ANP) distribution and granule density in cultured cells over time and after various treatments.
Main Results:
- Human thyroid follicles and follicular cells exhibited ANP-like immunoreactivity, concentrated in the epithelium of small follicles.
- Intracellular ir-ANP was observed in discrete, perinuclear granules, increasing with culture time, suggesting intrinsic synthesis.
- TSH did not affect ir-ANP distribution, but epinephrine and norepinephrine treatments reduced granularity, indicating potential stimulated release.
Conclusions:
- The peptide ANP coexists with thyroid hormones within human thyroid follicular cells.
- ANP and thyroid hormone production may be regulated by independent mechanisms.
- Catecholamines may play a role in modulating ANP release from thyroid cells.