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Shift work and autoimmune thyroid disorders.

A Magrini1, A Pietroiusti, L Coppeta

  • 1Department of Environmental, Occupational and Social Medicine, University of Rome Tor Vergata, Rome, Italy.

International Journal of Immunopathology and Pharmacology
|February 13, 2007
PubMed
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Shift work significantly increases the risk of developing autoimmune hypothyroidism, indicated by elevated thyroid peroxidase (TPO) autoantibodies and TSH levels. This study highlights a crucial link between occupational stress and thyroid health.

Area of Science:

  • Endocrinology
  • Immunology
  • Occupational Health

Background:

  • Stress is a known factor in immune response modulation and autoimmune disorders.
  • Previous research linked shift work stress to Graves' hyperthyroidism.
  • The association between occupational stress and autoimmune hypothyroidism remained unexplored.

Purpose of the Study:

  • To investigate the prevalence of subclinical autoimmune hypothyroidism in shift workers compared to day-time workers.
  • To determine if shift work is associated with elevated thyroid peroxidase (TPO) autoantibodies.
  • To explore the relationship between occupational stress and autoimmune hypothyroidism.

Main Methods:

  • A comparative study involving 220 shift workers and 422 day-time workers.
  • Diagnosis of subclinical autoimmune hypothyroidism based on high anti-TPO levels and TSH > 2.51 mU/l.

Related Experiment Videos

  • Measurement of anti-TPO antibodies using chemiluminescent technology (Advia Centaur), with >60 IU/l considered altered.

    • Main Results:

    • Subclinical autoimmune hypothyroidism was diagnosed in 7.7% of shift workers versus 3.8% of day-time workers (OR 2.12, p=0.03).
    • Altered anti-TPO antibodies were found in 13.6% of shift workers compared to 8.6% of day-time workers (OR 1.64, p=0.05).
    • These associations remained statistically significant after multivariate analysis adjusting for confounders.

    Conclusions:

    • Shift work is significantly associated with an increased risk of autoimmune hypothyroidism.
    • Findings suggest shift work may be a contributing factor to the development of autoimmune thyroid disease.
    • Results have implications for health surveillance programs monitoring shift workers' thyroid health.