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Abstract
Like many cytokines, IL-27 has pleiotropic properties that can limit or enhance ongoing immune responses depending on context. Thus, under certain circumstances, IL-27 can promote TH1 differentiation and has been linked to the activation of CD8(+) T cells and enhanced humoral responses. However, IL-27 also has potent inhibitory properties and mice that lack IL-27 mediated signaling develop exaggerated inflammatory responses in the context of infection or autoimmunity. This chapter reviews in depth the biology of IL-27, including the initial discovery, characterization, and signaling mediated by IL-27 as well as more recent insights into the molecular and cellular basis for its pleiotropic effects. Many of these advances are relevant to human diseases and highlight the potential of therapies that harness the regulatory properties of IL-27.
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Affiliation(s)
- Aisling O'Hara Hall
- Department of Pathobiology, School of Veterinary Medicine, Philadelphia, Pennsylvania, USA
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Glas J, Seiderer J, Bayrle C, Wetzke M, Fries C, Tillack C, Olszak T, Beigel F, Steib C, Friedrich M, Diegelmann J, Czamara D, Brand S. The role of osteopontin (OPN/SPP1) haplotypes in the susceptibility to Crohn's disease. PLoS One 2011; 6:e29309. [PMID: 22242114 PMCID: PMC3248444 DOI: 10.1371/journal.pone.0029309] [Citation(s) in RCA: 36] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/18/2011] [Accepted: 11/25/2011] [Indexed: 12/31/2022] Open
Abstract
BACKGROUND Osteopontin represents a multifunctional molecule playing a pivotal role in chronic inflammatory and autoimmune diseases. Its expression is increased in inflammatory bowel disease (IBD). The aim of our study was to analyze the association of osteopontin (OPN/SPP1) gene variants in a large cohort of IBD patients. METHODOLOGY/PRINCIPAL FINDINGS Genomic DNA from 2819 Caucasian individuals (n = 841 patients with Crohn's disease (CD), n = 473 patients with ulcerative colitis (UC), and n = 1505 healthy unrelated controls) was analyzed for nine OPN SNPs (rs2728127, rs2853744, rs11730582, rs11739060, rs28357094, rs4754 = p.Asp80Asp, rs1126616 = p.Ala236Ala, rs1126772 and rs9138). Considering the important role of osteopontin in Th17-mediated diseases, we performed analysis for epistasis with IBD-associated IL23R variants and analyzed serum levels of the Th17 cytokine IL-22. For four OPN SNPs (rs4754, rs1126616, rs1126772 and rs9138), we observed significantly different distributions between male and female CD patients. rs4754 was protective in male CD patients (p = 0.0004, OR = 0.69). None of the other investigated OPN SNPs was associated with CD or UC susceptibility. However, several OPN haplotypes showed significant associations with CD susceptibility. The strongest association was found for a haplotype consisting of the 8 OPN SNPs rs2728127-rs2853744-rs11730582-rs11439060-rs28357094-rs112661-rs1126772-rs9138 (omnibus p-value = 2.07×10⁻⁸). Overall, the mean IL-22 secretion in the combined group of OPN minor allele carriers with CD was significantly lower than that of CD patients with OPN wildtype alleles (p = 3.66×10⁻⁵). There was evidence for weak epistasis between the OPN SNP rs28357094 with the IL23R SNP rs10489629 (p = 4.18×10⁻²) and between OPN SNP rs1126616 and IL23R SNP rs2201841 (p = 4.18×10⁻²) but none of these associations remained significant after Bonferroni correction. CONCLUSIONS/SIGNIFICANCE Our study identified OPN haplotypes as modifiers of CD susceptibility, while the combined effects of certain OPN variants may modulate IL-22 secretion.
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Affiliation(s)
- Jürgen Glas
- Department of Medicine II - Grosshadern, Ludwig-Maximilians-University, Munich, Germany
- Department of Preventive Dentistry and Periodontology, Ludwig-Maximilians-University, Munich, Germany
- Department of Human Genetics, Rheinisch-Westfälische Technische Hochschule (RWTH), Aachen, Germany
| | - Julia Seiderer
- Department of Medicine II - Grosshadern, Ludwig-Maximilians-University, Munich, Germany
| | - Corinna Bayrle
- Department of Preventive Dentistry and Periodontology, Ludwig-Maximilians-University, Munich, Germany
| | - Martin Wetzke
- Department of Pediatrics, Hannover Medical School, Hannover, Germany
| | - Christoph Fries
- Department of Medicine II - Grosshadern, Ludwig-Maximilians-University, Munich, Germany
- Department of Preventive Dentistry and Periodontology, Ludwig-Maximilians-University, Munich, Germany
| | - Cornelia Tillack
- Department of Medicine II - Grosshadern, Ludwig-Maximilians-University, Munich, Germany
| | - Torsten Olszak
- Department of Medicine II - Grosshadern, Ludwig-Maximilians-University, Munich, Germany
- Division of Gastroenterology, Brigham and Women's Hospital, Harvard Medical School, Boston, Massachusetts, United States of America
| | - Florian Beigel
- Department of Medicine II - Grosshadern, Ludwig-Maximilians-University, Munich, Germany
| | - Christian Steib
- Department of Medicine II - Grosshadern, Ludwig-Maximilians-University, Munich, Germany
| | - Matthias Friedrich
- Department of Medicine II - Grosshadern, Ludwig-Maximilians-University, Munich, Germany
- Department of Preventive Dentistry and Periodontology, Ludwig-Maximilians-University, Munich, Germany
| | - Julia Diegelmann
- Department of Medicine II - Grosshadern, Ludwig-Maximilians-University, Munich, Germany
- Department of Preventive Dentistry and Periodontology, Ludwig-Maximilians-University, Munich, Germany
| | | | - Stephan Brand
- Department of Medicine II - Grosshadern, Ludwig-Maximilians-University, Munich, Germany
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