The pore-forming protein APOL7C ruptures Leishmania major-containing parasitophorous vacuoles in dendritic cells to promote IL-12 production and the induction of T helper type 1 immunity.

APOL7C expression in mouse classical dendritic cells is induced by Leishmania major infection and ruptures parasitophorous vacuoles, enabling IL-12 production.

• Why it matters: The mechanism linking L. major infection to strong IL-12 output by cDCs—and thus effective Th1 priming—was unclear.
• What they did: The study tracked APOL7C in cDCs, showing it localizes to L. major parasitophorous vacuoles and triggers vacuole rupture that exposes parasite PAMPs to cytosolic PRRs.
• The result: In APOL7C-deficient mice, L. major challenge yields fewer IL-12–producing cDCs and a diminished Th1 response, implying APOL7C-mediated vacuole disruption supports protective immunity.

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