摘要：SummaryBalance between cell proliferation and elimination is critical in handling threats both exogenous and of internal dysfunction. Recent work has implicated a conserved but poorly understood endoglycosidase heparanase (HPSE) in the restriction of innate defense responses, yet biochemical mediators of these key functions remained unclear. Here, an unbiased immunopurification proteomics strategy is employed to identify and rank uncharacterized interactions between HPSE and mediators of canonical signaling pathways linking cell cycle and stress responses. We demonstrate with models of genotoxic stress including herpes simplex virus infection and chemotherapeutic treatment that HPSE dampens innate responses to double-stranded DNA breakage by interfering with signal transduction between initial sensors and downstream mediators. Given the long-standing recognition of HPSE in driving late-stage inflammatory disease exemplified by tissue destruction and cancer metastasis, modulation of this protein with control over the DNA damage response imparts a unique strategy in the development of unconventional multivalent therapy.Graphical abstractDisplay OmittedHighlights•HPSE binds key proteins at interface of DNA damage signaling and IFN responses•Nuclear translocation of DNA damage transducer ATM is enhanced in absence of HPSE•Cells lacking HPSE display enhanced sensitivity to DNA damage-induced death•HPSE interfaces with regulators of DNA damage response to influence cell fateImmunology; Molecular Physiology; Proteomics
