Abstract

Indoleamine 2,3-dioxygenase (IDO) and tryptophan 2,3-dioxygenase (TDO) are key enzymes for tryptophan (Trp) degradation in the placenta, that is crucial for immune tolerance during pregnancy. Intrauterine renin-angiotensin system is also involved in the progression of a healthy pregnancy. Angiotensin (Ang) (1-7) inhibits the pro-inflammatory actions of Ang II, maintaining the integrity of fetal membranes. Since the correlation between Trp catabolism and intrauterine Ang (1-7) has never been investigated, we aimed to assess the co-expression of IDO, TDO and Ang (1-7) in the placenta.

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