Human intracellular ISG15 prevents interferon-alpha/beta over-amplification and auto-inflammation


Zhang X., Bogunovic D., Payelle-Brogard B., Francois-Newton V., Speer S. D. , Yuan C., ...Daha Fazla

NATURE, cilt.517, sa.7532, ss.89-103, 2015 (SCI İndekslerine Giren Dergi) identifier identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 517 Konu: 7532
  • Basım Tarihi: 2015
  • Doi Numarası: 10.1038/nature13801
  • Dergi Adı: NATURE
  • Sayfa Sayıları: ss.89-103

Özet

Intracellular ISG15 is an interferon (IFN)-alpha/beta-inducible ubiquitin-like modifier which can covalently bind other proteins in a process called ISGylation; it is an effector of IFN-alpha/beta-dependent antiviral immunity in mice(1-4). We previously published a study describing humans with inherited ISG15deficiency but without unusually severe viral diseases(5). We showed that these patients were prone to mycobacterial disease and that human ISG15 was non-redundant as an extracellular IFN-gamma-inducing molecule. We show here that ISG15-deficient patients also display unanticipated cellular, immunological and clinical signs of enhanced IFN-alpha/beta immunity, reminiscent of the Mendelian autoinflammatory interferonopathies Aicardi-Goutieres syndrome and spondyloenchondrodysplasia(6-9). We further show that an absence of intracellular ISG15 in the patients' cells prevents the accumulation of USP18(10,11), a potent negative regulator of IFN-alpha/beta signalling, resulting in the enhancement and amplification of IFN-alpha/beta responses. Human ISG15, therefore, is not only redundant for antiviral immunity, but is a key negative regulator of IFN-alpha/beta immunity. In humans, intracellular ISG15 is IFN-alpha/beta-inducible not to serve as a substrate for ISGylation-dependent antiviral immunity, but to ensure USP18-dependent regulation of IFN-alpha/beta and prevention of IFN-alpha/beta-dependent autoinflammation.