T. G. K and L. C. equally contributed to this manuscript.
Local free light chain expression is increased in chronic rhinosinusitis with nasal polyps
Article first published online: 5 JUL 2012
© 2012 John Wiley & Sons A/S
Volume 67, Issue 9, pages 1165–1172, September 2012
How to Cite
Groot Kormelink T, Calus L, De Ruyck N, Holtappels G, Bachert C, Redegeld FA, Gevaert P. Local free light chain expression is increased in chronic rhinosinusitis with nasal polyps. Allergy 2012; 67: 1165–1172.
Edited by: Wytske Fokkens
- Issue published online: 11 AUG 2012
- Article first published online: 5 JUL 2012
- Manuscript Accepted: 30 MAY 2012
- chronic rhinosinusitis;
- immunoglobulin free light chain;
- mast cell;
- nasal polyposis
Free light chain (FLC) concentrations are demonstrated to be increased in different inflammatory disorders and are proposed to mediate mast cell–dependent immune responses. A role for mast cells is suggested in chronic rhinosinusitis with nasal polyposis (CRSwNP), which is characterized by a local Th2 inflammatory response. However, clear mast cell–activating factors are not always apparent. In this study, the presence of FLCs in CRS patients with or without nasal polyps (CRSw/sNP) was investigated and the effect of different treatments on FLC expression was analyzed.
Nasal tissue, nasal secretion, and serum of control patients, patients with CRSwNP, and CRSsNP were analyzed for the presence of kappa and lambda FLC. The expression of FLCs in nasal polyp tissue was investigated using immunohistochemistry. In addition, FLC was measured in serum and nasal secretion of nasal polyp patients treated with methylprednisolone, doxycycline, anti-IL-5, or placebo.
Free light chain concentrations were increased in nasal secretion and mucosal tissue homogenates in patients with chronic rhinosinusitis, and this effect was most prominent in CRSwNP patients. Immunohistochemical analysis confirmed the increased FLC concentrations in nasal polyp tissue. In CRSwNP patients, treatment with methylprednisolone or anti-IL-5 resulted in the reduction in systemic or local FLC concentrations, respectively.
The presence of FLC in CRSwNP and CRSsNP suggests a possible role in mediating the local immune reaction in the paranasal cavities. Furthermore, the decrease in local FLCs after treatment with anti-IL-5 presumes that IL-5 creates an environment that favors FLC production.