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The IL32/BAFF axis supports prosurvival dialogs in the lymphoma ecosystem and is disrupted by NIK inhibition

Abstract : Aggressive B-cell malignancies, such as mantle cell lymphoma (MCL), are microenvironment-dependent tumors and a better understanding of the dialogs occurring in lymphoma protective ecosystems will provide new perspectives to increase treatment efficiency. To identify novel molecular regulations, we performed a transcriptomic analysis based on the comparison of circulating (n=77) versus MCL lymph nodes (n=107) together with RNA sequencing of malignant (n=8) versus normal B-cell (n=6) samples. This integrated analysis led to the discovery of microenvironment-dependent and tumor-specific secretion of the interleukin-32 beta (IL32β), whose expression was confirmed in situ within MCL lymph nodes by multiplex immunohistochemistry. Using ex vivo models of primary MCL cells (n=23), we demonstrated that, through the secretion of IL32β, the tumor was able to polarize monocytes into specific MCL-associated macrophages, which in turn favor tumor survival. We highlighted that while IL32β-stimulated macrophages secreted several protumoral factors, they supported tumor survival through a soluble dialog, mostly driven by BAFF. Finally, we demonstrated the efficacy of selective NIK/alternative-NFNB inhibition to counteract microenvironment-dependent induction of IL32β and BAFF-dependent survival of MCL cells. This data uncovered the IL32β/BAFF axis as a previously undescribed pathway involved in lymphoma-associated macrophages polarization and tumor survival, which could be counteracted through selective NIK inhibition.
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https://www.hal.inserm.fr/inserm-03625695
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Submitted on : Thursday, March 31, 2022 - 8:57:52 AM
Last modification on : Tuesday, September 27, 2022 - 3:07:24 AM
Long-term archiving on: : Friday, July 1, 2022 - 7:08:45 PM

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Salomé Decombis, Antonin Papin, Céline Bellanger, Clara Sortais, Christelle Dousset, et al.. The IL32/BAFF axis supports prosurvival dialogs in the lymphoma ecosystem and is disrupted by NIK inhibition. Haematologica, Ferrata Storti Foundation, 2022, Online ahead of print. ⟨10.3324/haematol.2021.279800⟩. ⟨inserm-03625695⟩

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