Toll-like receptor expression and function differ between splenic marginal zone B cell lymphoma and splenic diffuse red pulp B cell lymphoma
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Aurélie Verney1, Alexandra Traverse-Glehen1,2, Evelyne Callet-Bauchu1,3, Laurent Jallades1,3, Jean-Pierre Magaud1,3, Gilles Salles1,4, Laurent Genestier1 and Lucile Baseggio1,3
1Université de Lyon, Université Claude Bernard Lyon 1, INSERM 1052, CNRS 5286, Centre Léon Bérard, Cancer Research Center of Lyon, Lyon, France
2Service d’Anatomie-pathologique, Centre Hospitalier Lyon-Sud/Hospices Civils de Lyon, Pierre-Bénite, France
3Laboratoire d’Hématologie Cellulaire, Centre Hospitalier Lyon-Sud/Hospices Civils de Lyon, Pierre-Bénite, France
4Service d’Hématologie, Centre Hospitalier Lyon-Sud/Hospices Civils de Lyon, Pierre-Bénite, France
Lucile Baseggio, email: [email protected]
Keywords: splenic marginal zone lymphoma; splenic diffuse red pulp lymphoma; toll-like receptor
Received: March 21, 2017 Accepted: April 07, 2018 Published: May 04, 2018
In splenic marginal zone lymphoma (SMZL), specific and functional Toll-like Receptor (TLR) patterns have been recently described, suggesting their involvement in tumoral proliferation. Splenic diffuse red pulp lymphoma with villous lymphocytes (SDRPL) is close to but distinct from SMZL, justifying here the comparison of TLR patterns and functionality in both entities.
Distinct TLR profiles were observed in both lymphoma subtypes. SDRPL B cells showed higher expression of TLR7 and to a lesser degree TLR9, in comparison to SMZL B cells. In both entities, TLR7 and TLR9 pathways appeared functional, as shown by IL-6 production upon TLR7 and TLR9 agonists stimulations. Interestingly, circulating SDRPL, but not SMZL B cells, constitutively expressed CD86. In addition, stimulation with both TLR7 and TLR9 agonists significantly increased CD80 expression in circulating SDRPL but not SMZL B cells. Finally, TLR7 and TLR9 stimulations had no impact on proliferation and apoptosis of SMZL or SDRPL B cells.
In conclusion, SMZL and SDRPL may derive from different splenic memory B cells with specific immunological features that can be used as diagnosis markers in the peripheral blood.
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