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Data · dataset · 2025

Trem2 prevents adverse pregnancy outcomes induced by Toxoplasma gondii by promoting PPARγ-mediated P-STAT6 signaling

Listed in Teesside University Research Data Repository

Decidual macrophages (DMs), required for the maintenance of a successful pregnancy, are vital target cells for Toxoplasma gondii (T. gondii) during adverse pregnancy induced by T. gondii.

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Trem2 is a functional immune receptor on the surface of DMs, governing cell survival and phagocytosis. Our previous study demonstrated that Trem2 deficiency aggravates T. gondii-induced adverse pregnancy outcomes.

However, Trem2-related downstream signaling pathways in T. gondii-induced adverse pregnancy outcomes remains unclear. Here, we demonstrated a significant decrease in PPARγ and phosphorylated-STAT6 (P-STAT6) in mouse placentas following T. gondii infection. By using a Trem2 knockout mouse model, we found that Trem2 deficiency failed to affect the expressions of P-STAT6 and PPARγ in infected mouse placentas, peritoneal macrophages and bone marrow-derived macrophages (BMDMs).

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Consistently, overexpression of Trem2 in macrophages significantly activated the downstream signaling pathway and partially reversed the inhibitory effects of T. gondii antigens on P-STAT6 and PPARγ, similar to the effect of PPARγ agonists. Altogether, our study identified Trem2 as a key regulator of PPARγ-mediated P-STAT6 signaling pathways in adverse pregnancy outcomes due to T. gondii infection. Our novel findings concerning Trem2 and its downstream PPARγ-mediated P-STAT6 signaling pathways might provide new preventive and therapeutic targets for toxoplasmosis.

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