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Träfflista för sökning "WFRF:(Gevaert P) ;pers:(Lambrecht BN)"

Sökning: WFRF:(Gevaert P) > Lambrecht BN

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  • Calus, L, et al. (författare)
  • IL-21 Is Increased in Nasal Polyposis and after Stimulation with Staphylococcus aureus Enterotoxin B
  • 2017
  • Ingår i: International archives of allergy and immunology. - : S. Karger AG. - 1423-0097 .- 1018-2438. ; 174:3-4, s. 161-169
  • Tidskriftsartikel (refereegranskat)abstract
    • <b><i>Background:</i></b> Chronic rhinosinusitis with nasal polyposis (CRSwNP) is an inflammatory disease associated with lymphoid aggregates and local IgE production related to <i>Staphylococcus aureus</i> enterotoxins. T-follicular helper cells and their effector cytokine interleukin (IL)-21 play an important role in germinal center proliferation. <b><i>Methods:</i></b> IL-21 was determined on the mRNA level by qPCR in nasal tissue of 3 groups of patients: control (<i>n</i> = 17), chronic rhinosinusitis without nasal polyposis (CRSsNP; <i>n</i> = 23), and CRSwNP (<i>n</i> = 35). The expression of IL-21 by CD4+ T cells was analyzed in tissue at baseline and after 24-h stimulation of tissue fragments with <i>S. aureus</i> enterotoxin B (SEB) using flow cytometry. Finally, human nasal IL-21+CXCR5+CD4+ T cells were isolated and coincubated with human blood naive B cells to investigate their functionality. <b><i>Results:</i></b> IL-21 mRNA expression was increased in the CRSwNP group (<i>p</i> < 0.05) compared to the control group, and B-cell lymphoma-6 and B-lymphocyte-induced maturation protein-1 were upregulated in CRSwNP versus CRSsNP. Furthermore, SEB was able to increase IL-21 mRNA expression significantly (<i>p</i> < 0.01) in nasal polyps. Flow cytometry revealed that the source of IL-21 was predominantly CD4+ T cells and that IL-21+CD4+ T cells were significantly increased in polyp tissue and further increased after SEB stimulation. Finally, tissue CXCR5+CD4+ T cells derived from nasal polyp tissue were able to induce maturation of human naive B cells. <b><i>Conclusions:</i></b> IL-21- and IL-21-producing CD4+ T cells were increased in CRSwNP. In addition, SEB induced an increase in IL-21 and IL-21+CD4+ T cells, suggesting that <i>S. aureus</i> can modulate the function of Tfh cells in nasal polyps. We speculate that T-follicular helper cells and IL-21 are important in the pathophysiology of CRSwNP.
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  • Vlaminck, S, et al. (författare)
  • Surgery in Nasal Polyp Patients: Outcome After a Minimum Observation of 10 Years
  • 2021
  • Ingår i: American journal of rhinology & allergy. - : SAGE Publications. - 1945-8932 .- 1945-8924. ; 35:4, s. 449-457
  • Tidskriftsartikel (refereegranskat)abstract
    • Chronic rhinosinusitis with nasal polyps (CRSwNP) often requires surgery, but recurrence even after surgery is common. Recurrence rates largely vary in literature and asthma seems to be a comorbid factor. Objective In this study, we aim to estimate disease recurrence during a long-term follow-up, together with the investigation of possible predicting and/or influencing parameters. Methods Out of 196 patients operated for CRSwNP between 01/2000 and 01/2006, 133 patients had a follow-up of at least 10 years and could be included. The inflammatory profile at surgery was determined on nasal tissue and sinonasal secretions, and included analysis of eosinophils, eosinophilic-rich mucus (ERM) typically containing Charcot-Leyden crystals (CLC), and fungal hyphae (FH). During follow-up, recurrence, received treatments and comorbidities were collected. Results Out of the 133 included patients, local eosinophilia was present in 81% and ERM in 60%. Recurrence during follow-up was observed in 62%, and was associated with local eosinophilia and ERM (both p < 0.001). Asthma was present in 28% at inclusion, and 17% developed asthma after surgery during follow-up. The presence of asthma, at inclusion as well as developed during follow-up, was significantly associated with recurrence of CRSwNP (p = 0.001 for group comparison). Conclusion Recurrence after CRSwNP surgery is common when a long-term follow-up is taken into account. ERM detected in sinonasal secretions at surgery seems to be a predictive factor for recurrence and need for revision surgery. Asthma is a frequently found comorbid factor in CRSwNP, develops even at higher age despite surgical treatment for CRSwNP, and is also associated with a higher recurrence rate. Sustained medical care after surgery is mandatory.
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