Neutrophils Restrain CCR2-Dependent Monocyte Immunopathology During Pulmonary Cryptococcosis.

Neutrophil depletion in mice infected with Cryptococcus neoformans causes significantly more rapid mortality, despite unchanged fungal burden, highlighting a protective neutrophil role.

• Why it matters: Prior work suggested neutrophils are dispensable in cryptococcosis, but the paradoxical biology and conflicting depletion results left their true contribution unclear.
• What they did: Using Ly6G-specific depletion strategies, mice were infected with Cryptococcus neoformans, then pulmonary chemokines/IL-17A and monocyte/macrophage accumulation were measured through day 7.
• The result: Increased mortality was linked to early inflammatory signaling and monocyte-associated immunopathology, and it was completely absent in Ccr2-/- mice, implicating CCR2-dependent responses in severity.