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N Engl J Med. 2014 Aug 7;371(6):507-518. doi: 10.1056/NEJMoa1312625. Epub 2014 Jul 16.

Activated STING in a vascular and pulmonary syndrome.

Author information

1
National Institute of Arthritis and Musculoskeletal and Skin Diseases (Y.L., A.A.J., B.M., G.A.M.S., M.A.D., I.P., H.K., W.L.T., A.M.T., Y.H., N.P., D.C., M.G., A.C.S., P.T.W., S.R.B., Z.D., R.G-M.), National Cancer Institute (C.-C.R.L., E.W.C., J.J.D., M.R.), National Heart, Lung, and Blood Institute (D.Y., A. Biancotto, C.S.H., J.R.F., C.P.M., M.B.), Department of Laboratory Medicine (H.S.K., S.G., S.D.R., T.A.F.), National Human Genome Research Institute (D.L.S., F.C., D.L.K.), Department of Radiology and Imaging Services (S.H.), National Institute on Deafness and Other Communication Disorders (H.J.K.), and National Institute of Allergy and Infectious Diseases (S.M.H., S.M.) - all at the National Institutes of Health (NIH), and Walter Reed National Military Medical Center (O.Y.J., I.H.-S.) - both in Bethesda, MD; Dalhousie University, Halifax, NS, Canada (S.E.R., A.C.I.); Rheinisch-Westfaelische Technische Hochschule Aachen, Aachen (K.T.), and University Hospital of Muenster, Muenster (H.W., D.F., A. Barysenka) - both in Germany; Luis Calvo Mackenna Hospital, Santiago, Chile (B.G.); Merck Research Laboratories, Boston (J.D.H., H.M., J.M.); and Northwestern University Feinberg School of Medicine, Chicago (A.S.P.).
#
Contributed equally

Abstract

BACKGROUND:

The study of autoinflammatory diseases has uncovered mechanisms underlying cytokine dysregulation and inflammation.

METHODS:

We analyzed the DNA of an index patient with early-onset systemic inflammation, cutaneous vasculopathy, and pulmonary inflammation. We sequenced a candidate gene, TMEM173, encoding the stimulator of interferon genes (STING), in this patient and in five unrelated children with similar clinical phenotypes. Four children were evaluated clinically and immunologically. With the STING ligand cyclic guanosine monophosphate-adenosine monophosphate (cGAMP), we stimulated peripheral-blood mononuclear cells and fibroblasts from patients and controls, as well as commercially obtained endothelial cells, and then assayed transcription of IFNB1, the gene encoding interferon-β, in the stimulated cells. We analyzed IFNB1 reporter levels in HEK293T cells cotransfected with mutant or nonmutant STING constructs. Mutant STING leads to increased phosphorylation of signal transducer and activator of transcription 1 (STAT1), so we tested the effect of Janus kinase (JAK) inhibitors on STAT1 phosphorylation in lymphocytes from the affected children and controls.

RESULTS:

We identified three mutations in exon 5 of TMEM173 in the six patients. Elevated transcription of IFNB1 and other gene targets of STING in peripheral-blood mononuclear cells from the patients indicated constitutive activation of the pathway that cannot be further up-regulated with stimulation. On stimulation with cGAMP, fibroblasts from the patients showed increased transcription of IFNB1 but not of the genes encoding interleukin-1 (IL1), interleukin-6 (IL6), or tumor necrosis factor (TNF). HEK293T cells transfected with mutant constructs show elevated IFNB1 reporter levels. STING is expressed in endothelial cells, and exposure of these cells to cGAMP resulted in endothelial activation and apoptosis. Constitutive up-regulation of phosphorylated STAT1 in patients' lymphocytes was reduced by JAK inhibitors.

CONCLUSIONS:

STING-associated vasculopathy with onset in infancy (SAVI) is an autoinflammatory disease caused by gain-of-function mutations in TMEM173. (Funded by the Intramural Research Program of the National Institute of Arthritis and Musculoskeletal and Skin Diseases; ClinicalTrials.gov number, NCT00059748.).

PMID:
25029335
PMCID:
PMC4174543
DOI:
10.1056/NEJMoa1312625
[Indexed for MEDLINE]
Free PMC Article

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