{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,10,7]],"date-time":"2026-10-07T16:02:29Z","timestamp":1791388949002,"version":"4.3.3"},"reference-count":36,"publisher":"Frontiers Media SA","license":[{"start":{"date-parts":[[2023,5,26]],"date-time":"2023-05-26T00:00:00Z","timestamp":1685059200000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"content-domain":{"domain":["frontiersin.org"],"crossmark-restriction":true},"short-container-title":["Front. Immunol."],"abstract":"<jats:p>Statement of significance: Loss of <jats:italic>TFL<\/jats:italic>, found in several types of lymphoma, induces excessive CXCL13 secretion through RNA dysregulation contributing to body weight loss and early death in lymphoma model mice. Follicular lymphoma (FL) is associated with overexpressed BCL-2 and other genetic aberrations, including 6q-. We identified a novel gene on 6q25, \u201c<jats:italic>Transformed follicular lymphoma<\/jats:italic> (<jats:italic>TFL<\/jats:italic>),\u201d from a transformed FL. TFL regulates several cytokines <jats:italic>via<\/jats:italic> mRNA degradation, which has been suggested to underlie resolving inflammation. Fluorescence <jats:italic>in situ<\/jats:italic> hybridization revealed a deletion of <jats:italic>TFL<\/jats:italic> occurred in 13.6% of various B-cell lymphoma samples. We developed VavP-<jats:italic>bcl2<\/jats:italic> transgenic, TFL deficit mice (<jats:italic>Bcl2<\/jats:italic>-Tg\/<jats:italic>Tfl<\/jats:italic><jats:sup>-\/-<\/jats:sup>) to seek how TFL affects disease progression in this lymphoma model. While <jats:italic>Bcl2<\/jats:italic>-Tg mice developed lymphadenopathy and died around 50 weeks, <jats:italic>Bcl2<\/jats:italic>-Tg\/<jats:italic>Tfl<\/jats:italic><jats:sup>-\/-<\/jats:sup> mice lost body weight around 30 weeks and died about 20 weeks earlier than <jats:italic>Bcl2<\/jats:italic>-Tg mice. Furthermore, we found a unique B220<jats:sup>-<\/jats:sup>IgM<jats:sup>+<\/jats:sup> cell population in the bone marrow of <jats:italic>Bcl2<\/jats:italic>-Tg mice. cDNA array in this population revealed that Cxcl13 mRNA in <jats:italic>Bcl2<\/jats:italic>-Tg\/<jats:italic>Tfl<\/jats:italic><jats:sup>-\/-<\/jats:sup> mice expressed significantly higher than <jats:italic>Bcl2<\/jats:italic>-Tg mice. In addition, bone marrow extracellular fluid and serum showed an extremely high Cxcl13 concentration in <jats:italic>Bcl2<\/jats:italic>-Tg\/<jats:italic>Tfl<\/jats:italic><jats:sup>-\/-<\/jats:sup> mice. Among bone marrow cells, the B220<jats:sup>-<\/jats:sup>IgM<jats:sup>+<\/jats:sup> fraction was the main producer of Cxcl13 in culture. A reporter assay demonstrated TFL regulates CXCL-13 <jats:italic>via<\/jats:italic> induction of 3\u2019UTR mRNA degradation in B lineage cells. These data suggest Tfl regulates Cxcl13 in B220<jats:sup>-<\/jats:sup>IgM<jats:sup>+<\/jats:sup> cells in the bone marrow, and a very high concentration of serum Cxcl13 arising from these cells may contribute to early death in lymphoma-bearing mice. Since several reports have suggested the association of CXCL13 expression with lymphoma, these findings provide new insights into cytokine regulation <jats:italic>via<\/jats:italic> TFL in lymphoma.<\/jats:p>","DOI":"10.3389\/fimmu.2023.1197112","type":"journal-article","created":{"date-parts":[[2023,5,26]],"date-time":"2023-05-26T04:47:05Z","timestamp":1685076425000},"update-policy":"https:\/\/doi.org\/10.3389\/crossmark-policy","source":"Crossref","is-referenced-by-count":3,"title":["Tfl deletion induces extraordinary Cxcl13 secretion and cachexia in VavP-Bcl2 transgenic 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