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N Engl J Med. 2009 Nov 19;361(21):2033-45. doi: 10.1056/NEJMoa0907206. Epub 2009 Nov 4.

Inflammatory bowel disease and mutations affecting the interleukin-10 receptor.

Author information

1
Department of Immunology, Royal Free Hospital and University College London, United Kingdom.

Abstract

BACKGROUND:

The molecular cause of inflammatory bowel disease is largely unknown.

METHODS:

We performed genetic-linkage analysis and candidate-gene sequencing on samples from two unrelated consanguineous families with children who were affected by early-onset inflammatory bowel disease. We screened six additional patients with early-onset colitis for mutations in two candidate genes and carried out functional assays in patients' peripheral-blood mononuclear cells. We performed an allogeneic hematopoietic stem-cell transplantation in one patient.

RESULTS:

In four of nine patients with early-onset colitis, we identified three distinct homozygous mutations in genes IL10RA and IL10RB, encoding the IL10R1 and IL10R2 proteins, respectively, which form a heterotetramer to make up the interleukin-10 receptor. The mutations abrogate interleukin-10-induced signaling, as shown by deficient STAT3 (signal transducer and activator of transcription 3) phosphorylation on stimulation with interleukin-10. Consistent with this observation was the increased secretion of tumor necrosis factor alpha and other proinflammatory cytokines from peripheral-blood mononuclear cells from patients who were deficient in IL10R subunit proteins, suggesting that interleukin-10-dependent "negative feedback" regulation is disrupted in these cells. The allogeneic stem-cell transplantation performed in one patient was successful.

CONCLUSIONS:

Mutations in genes encoding the IL10R subunit proteins were found in patients with early-onset enterocolitis, involving hyperinflammatory immune responses in the intestine. Allogeneic stem-cell transplantation resulted in disease remission in one patient.

PMID:
19890111
PMCID:
PMC2787406
DOI:
10.1056/NEJMoa0907206
[Indexed for MEDLINE]
Free PMC Article

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