Original Article

Journal of Molecular Medicine

, Volume 91, Issue 11, pp 1293-1302

Effect of prenatal steroid treatment on the developing immune system

  • Ines DiepenbruckAffiliated withDepartment of Immunology, University Medical Center Hamburg-Eppendorf
  • , Chressen C. MuchAffiliated withDiagnostic and Interventional Radiology Department, University Medical Center Hamburg-Eppendorf
  • , Aniko KrumbholzAffiliated withInstitute of Doping Analysis and Sports Biochemistry
  • , Manuela KolsterAffiliated withDepartment of Immunology, University Medical Center Hamburg-Eppendorf
  • , René ThiemeAffiliated withLaboratory for Experimental Feto-Maternal Medicine, Department of Obstetrics and Fetal Medicine, University Medical Center Hamburg-Eppendorf
  • , Detlef ThiemeAffiliated withInstitute of Doping Analysis and Sports Biochemistry
  • , Silke DiepenbruckAffiliated withCHIESI GmbH
  • , M. Emilia SolanoAffiliated withLaboratory for Experimental Feto-Maternal Medicine, Department of Obstetrics and Fetal Medicine, University Medical Center Hamburg-Eppendorf
  • , Petra C. ArckAffiliated withLaboratory for Experimental Feto-Maternal Medicine, Department of Obstetrics and Fetal Medicine, University Medical Center Hamburg-Eppendorf

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Abstract

Prenatal steroids have an undisputed positive effect of decreasing neonatal morbidity and mortality by improving fetal lung maturation. Some concerns have been raised on long-term consequences on the hypothalamic–pituitary–adrenal axis and cognition, but there are no studies addressing effects on the immune system. The thymus is an essential organ for the development and selection of T cells, and thymocytes are extremely sensitive to steroids. Using a mouse model for prenatal steroid administration, we show here that betamethasone treatment to the mother has a profound effect on the thymus of the offspring. We find the thymus volume reduced, affecting mostly the developing CD4+ CD8+ double-positive thymocytes and a compensatory accelerated transition of the earlier stages to replenish the depleted compartment. This effect lasts for at least 3 days, which correspond to a very relevant period for the selection of the T cell repertoire. Moreover, we show that low doses of betamethasone have similar effects on human thymocytes in vitro. Therefore, further studies are needed to analyze possible long-term consequences of this treatment on the immune system of the offspring.

Key message

  • Betamethasone administered to the mother before birth reaches the fetal thymus.

  • Prenatal betamethasone results in massive loss of developing thymocytes.

  • The effects of betamethasone on thymus development are visible for several days.

  • Human thymocytes are also sensitive to low doses of betamethasone.

  • Altered thymocyte development around birth may have an effect on the immune system.

Keywords

Prenatal steroids Pregnancy Betamethasone Thymus Apoptosis Thymocyte development