IRE1α promotes viral infection by conferring resistance to apoptosis.

The unfolded protein response (UPR) is an ancient cellular pathway that detects and alleviates protein-folding stresses. The UPR components X-box binding protein 1 (XBP1) and inositol-requiring enzyme 1α (IRE1α) promote type I interferon (IFN) responses. We found that -deficient mouse embryonic fibroblasts and macrophages had impaired antiviral resistance.