Cleavage of DNA and RNA by PLD3 and PLD4 limits autoinflammatory triggering by multiple sensors.

ABSTRACT: Phospholipase D3 (PLD3) and PLD4 polymorphisms have been associated with several important inflammatory diseases. Here, we show that PLD3 and PLD4 digest ssRNA in addition to ssDNA as reported previously. Moreover, Pld3^-/-Pld4^-/- mice accumulate small ssRNAs and develop spontaneous fatal hemophagocytic lymphohistiocytosis (HLH) characterized by inflammatory liver damage and overproduction of Interferon (IFN)-γ. Pathology is rescued in Unc93b1^3d/3dPld3^-/-Pld4^-/- mice, which lack all endosomal TLR signaling; genetic codeficiency or antibody blockade of TLR9 or TLR7 ameliorates disease less effectively, suggesting that both RNA and DNA sensing by TLRs contributes to inflammation. IFN-γ made a minor contribution to pathology. Elevated type

SUBMITTER: Gavin AL 

PROVIDER: S-EPMC8497607 | biostudies-literature | 2021 Oct

REPOSITORIES: biostudies-literature