Endocrinology. 2016 Apr 1:en20151957. [Epub ahead of print]

Gestational hypothyroidism improves the ability of the female offspring to clear Streptococcus pneumoniaeinfection and to recover from pneumococcal pneumonia.

Nieto PA1, Peñaloza HF1, Salazar-Echegarai FJ1, Castellanos RM2, Cecilia Opazo M3, Venegas L3, Padilla O4, Kalergis AM1,5,6, Riedel CA3, Bueno SM1,5.

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Maternal thyroid hormones are essential for proper fetal development. A deficit of these hormones during gestation has enduring consequences in the central nervous system of the offspring, including detrimental learning and impaired memory. Few studies have shown that thyroid hormone deficiency has a transient effect in the number of T and B cells in the offspring gestated under hypothyroidism, however there are no studies showing if maternal hypothyroidism during gestation impacts the response of the offspring to infections. In this study we have evaluated whether adult mice gestated in hypothyroid mothers have an altered response to pneumococcal pneumonia. We observed that female mice gestated in hypothyroidism have increased survival rate and less bacterial dissemination to blood and brain after an intranasal challenge with Streptococcus pneumoniae. Further, these mice had higher amounts of inflammatory cells in the lungs, and reduced production of cytokines characteristic of sepsis in spleen, blood and brain at 48 h after infection. Interestingly, mice gestated in hypothyroid mothers had basally increased vascular permeability in the lungs. These observations suggest that gestational hypothyroidism alters the immune response and the physiology of lungs in the offspring, increasing the resistance to respiratory bacterial infections.

PMID: 27035652 [PubMed - as supplied by publisher]