update bib

+@article{huFollicularLymphomaassociatedBTK2021,

+ title = {Follicular {{Lymphoma-associated BTK Mutations}} Are {{Inactivating Resulting}} in {{Augmented AKT Activation}}},

+ author = {Hu, Nan and Wang, Fangyang and Sun, Tianyu and Xu, Zhengfan and Zhang, Jing and Bernard, Denzil and Xu, Shilin and Wang, Shaomeng and Kaminski, Mark and Devata, Suma and Phillips, Tycel and Malek, Sami N.},

+ date = {2021-04-15},

+ journaltitle = {Clinical Cancer Research: An Official Journal of the American Association for Cancer Research},

+ shortjournal = {Clin Cancer Res},

+ volume = {27},

+ number = {8},

+ eprint = {33419778},

+ eprinttype = {pmid},

+ pages = {2301--2313},

+ issn = {1557-3265},

+ doi = {10.1158/1078-0432.CCR-20-3741},

+ abstract = {PURPOSE: On the basis of the recent discovery of mutations in Bruton tyrosine kinase (BTK) in follicular lymphoma, we studied their functional properties. EXPERIMENTAL DESIGN: We identified novel somatic BTK mutations in 7\% of a combined total of 139 follicular lymphoma and 11 transformed follicular lymphoma cases, none of which had received prior treatment with B-cell receptor (BCR) targeted drugs. We reconstituted wild-type (WT) and mutant BTK into various engineered lymphoma cell lines. We measured BCR-induced signal transduction events in engineered cell lines and primary human follicular lymphoma B cells. RESULTS: We uncovered that all BTK mutants destabilized the BTK protein and some created BTK kinase-dead mutants. The phospholipase C gamma 2 (PLCγ2) is a substrate of BTK but the BTK mutants did not alter PLCγ2 phosphorylation. Instead, we discovered that BTK mutants induced an exaggerated AKT phosphorylation phenotype in anti-Ig-treated recombinant lymphoma cell lines. The short hairpin RNA-mediated knockdown of BTK expression in primary human nonmalignant lymph node-derived B cells resulted in strong anti-Ig-induced AKT activation, as did the degradation of BTK protein in cell lines using ibrutinib-based proteolysis targeting chimera. Finally, through analyses of primary human follicular lymphoma B cells carrying WT or mutant BTK, we detected elevated AKT phosphorylation following surface Ig crosslinking in all follicular lymphoma B cells, including all BTK-mutant follicular lymphoma. The augmented AKT phosphorylation following BCR crosslinking could be abrogated by pretreatment with a PI3Kδ inhibitor. CONCLUSIONS: Altogether, our data uncover novel unexpected properties of follicular lymphoma-associated BTK mutations with direct implications for targeted therapy development in follicular lymphoma.See related commentary by Afaghani and Taylor, p. 2123.},

+ langid = {english},

+ pmcid = {PMC8046715},

+ keywords = {Agammaglobulinaemia Tyrosine Kinase,Cell Line Tumor,Class I Phosphatidylinositol 3-Kinases,DNA Mutational Analysis,Gene Knockdown Techniques,HEK293 Cells,Humans,Loss of Function Mutation,Lymphoma Follicular,Mutagenesis Site-Directed,Phospholipase C gamma,Phosphorylation,Primary Cell Culture,Protein Stability,Proto-Oncogene Proteins c-akt},

+}

+