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- Melgar, S (author)
Over-expression of interleukin 10 in mucosal T cells of patients with active ulcerative colitis.
- Article/chapterEnglish2003
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- 2003
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- LIBRIS-ID:oai:DiVA.org:umu-67883
- https://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-67883URI
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- Language:English
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- Ulcerative colitis (UC), a chronic inflammatory bowel disease, exhibits pronounced increase of T lymphocytes in the inflamed mucosa. To understand the role of intestinal T lymphocytes in the pathogenesis of UC their cytokine production in the mucosa was analysed. Intestinal T lymphocytes of UC, Crohn's disease and control patients were analysed for cytokine mRNA levels by real-time quantitative reverse transcription-polymerase chain reaction (RT-PCR) directly after isolation without in vitro stimulation. Frequencies of cytokine positive cells were determined in UC and control colon by immunomorphometry. T lymphocytes in normal colon expressed interleukin (IL)-2, interferon (IFN)-gamma, tumour necrosis factor (TNF)-alpha and transforming growth factor (TGF)-beta1, but not IL-4, IL-5 or IL-10. In UC, a highly significant increase in IL-10 mRNA levels in T lymphocytes and an increased frequency of IL-10 positive cells was seen in colon. IL-10 mRNA levels were also elevated in T lymphocytes of the non-inflamed ileum and correlated with disease activity at both locations. CD4+ T lymphocytes were the major source of IL-10 mRNA. IL-2, IFN-gamma and TNF-alpha mRNA levels were decreased in colonic T lymphocytes, and virtually no IL-2, IFN-gamma, TNF-alpha or TGF-beta positive cells were detected in basal lymphoid aggregates. However, scattered IL-10 positive cells were found here. Lamina propria outside the aggregates contained IL-10-, IFN-gamma, TNF-alpha and TGF-beta but not IL-2 positive cells. T cells of UC patients did not express IL-4 or IL-5. Taken, together the data suggest a generalized activation of IL-10 producing CD4+ T cells along the intestine of UC patients. The local environment seems to determine the biological consequences of elevated IL-10.
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- Yeung, M M-W (author)
- Bas, A (author)
- Forsberg, G (author)
- Suhr, O (author)
- Oberg, A (author)
- Hammarström, StenUmeå universitet,Immunologi/immunkemi(Swepub:umu)stha0002 (author)
- Danielsson, A (author)
- Hammarström, Marie-LouiseUmeå universitet,Immunologi/immunkemi(Swepub:umu)maha0008 (author)
- Umeå universitetImmunologi/immunkemi (creator_code:org_t)
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- In:Clinical and Experimental Immunology134:1, s. 127-370009-91041365-2249
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