TREM2 receptor identified as inhibitor of immune response to Cryptococcus neoformans infection
Researchers identified TREM2, a receptor on immune cells, as a key inhibitor of the body's antifungal response to Cryptococcus neoformans, a dangerous opportunistic fungus. TREM2 works through the DAP12 signaling pathway to suppress macrophage activation and fungal uptake, and can directly bind to the fungus via its cell wall components. Understanding this mechanism could inform new therapeutic strategies for treating cryptococcal infections, particularly in immunocompromised patients.
A new study published on bioRxiv demonstrates that TREM2 (triggering receptor expressed on myeloid cells 2) plays a suppressive role in immune defenses against Cryptococcus neoformans, an opportunistic fungus that causes serious pulmonary and central nervous system infections. The researchers found that TREM2 is induced on monocytes and lung macrophages during C. neoformans infection and functions through the DAP12 adapter protein to inhibit both fungal uptake and M1 polarization of macrophages—processes normally protective against infection. Using binding assays, the team demonstrated that both mouse and human TREM2 can directly recognize and bind to C. neoformans, with this interaction dependent on the fungal cell wall component β-1,6-glucan. These findings establish TREM2 as both a direct fungal sensor and a negative regulator of antifungal immunity, suggesting that blocking this pathway could potentially enhance immune responses to cryptococcal infection.
What's missing
The study does not discuss potential therapeutic implications or whether TREM2 inhibition has been tested in animal models of infection. Additionally, the preprint does not address whether TREM2 expression patterns differ in immunocompromised populations most susceptible to cryptococcal disease, or provide information on the clinical relevance of these findings for human patients.
What different sources said
- bioRxivCenter
TREM2 drives monocyte-derived macrophage responses to Cryptococcus neoformans
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