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. 1992 Mar 1;89(5):1944–1948. doi: 10.1073/pnas.89.5.1944

Hormonal regulation of major histocompatibility complex class I genes in rat thyroid FRTL-5 cells: thyroid-stimulating hormone induces a cAMP-mediated decrease in class I expression.

M Saji 1, J Moriarty 1, T Ban 1, L D Kohn 1, D S Singer 1
PMCID: PMC48570  PMID: 1311856

Abstract

Thyrocytes normally express major histocompatibility complex (MHC) class I, but not class II, cell surface antigens. A rat thyrocyte cell line, FRTL-5, also expresses MHC class I antigens, in addition to a variety of thyroid-specific genes. Treatment of FRTL-5 thyrocytes with physiological concentrations of thyroid-stimulating hormone (TSH) has been shown to induce increased expressed of thyroglobulin and thyroid peroxidase but to simultaneously decrease expression of the TSH receptor. The reduction in TSH receptor expression by TSH is cAMP mediated. In the present study, it is demonstrated that, in thyrocytes treated with TSH, MHC class I expression decreases concomitant with the decrease in TSH receptor expression. This decreased expression is evidenced by reduced cell surface levels of MHC class I antigens, by reduced steady-state RNA levels, and by reduced transcription of the class I genes. TSH-mediated reduction of MHC class I gene transcription in FRTL-5 cells was mapped to a region within 135 base pairs of the promoter.

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Selected References

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