PARP14 is a novel target in STAT6 mutant follicular lymphoma

Abstract The variable clinical course of follicular lymphoma (FL) is determined by the molecular heterogeneity of tumor cells and complex interactions within the tumor microenvironment (TME). IL-4 producing follicular helper T cells (T FH ) are critical components of the FL TME. Binding of IL-4 to I...

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Published in:Leukemia 2022-09, Vol.36 (9), p.2281-2292
Main Authors: Mentz, Michael, Keay, William, Strobl, Carolin Dorothea, Antoniolli, Martina, Adolph, Louisa, Heide, Michael, Lechner, Axel, Haebe, Sarah, Osterode, Elisa, Kridel, Robert, Ziegenhain, Christoph, Wange, Lucas Esteban, Hildebrand, Johannes Adrian, Shree, Tanaya, Silkenstedt, Elisabeth, Staiger, Annette M., Ott, German, Horn, Heike, Szczepanowski, Monika, Richter, Julia, Levy, Ronald, Rosenwald, Andreas, Enard, Wolfgang, Zimber-Strobl, Ursula, von Bergwelt-Baildon, Michael, Hiddemann, Wolfgang, Klapper, Wolfram, Schmidt-Supprian, Marc, Rudelius, Martina, Bararia, Deepak, Passerini, Verena, Weigert, Oliver
Format: Article
Language:English
Subjects:
Binding
CCL17 protein
CCL22 protein
CD23 antigen
Chromatin
Circuits
Critical components
Deoxyribonucleic acid
DNA
Gene expression
Gene sequencing
Genes
Heterogeneity
Immunohistochemistry
Immunoprecipitation
Interleukin 4
Lymphocytes
Lymphocytes T
Lymphoma
Mutation
Phenotypes
Poly(ADP-ribose) polymerase
Stat6 protein
Therapeutic targets
Tumor cells
Tumor microenvironment
Tumors
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Summary:Abstract The variable clinical course of follicular lymphoma (FL) is determined by the molecular heterogeneity of tumor cells and complex interactions within the tumor microenvironment (TME). IL-4 producing follicular helper T cells (T FH ) are critical components of the FL TME. Binding of IL-4 to IL-4R on FL cells activates JAK/STAT signaling. We identified STAT6 mutations ( STAT6 MUT ) in 13% of FL ( N  = 33/258), all clustered within the DNA binding domain. Gene expression data and immunohistochemistry showed upregulation of IL-4/STAT6 target genes in STAT6 MUT FL, including CCL17 , CCL22 , and FCER2 (CD23). Functionally, STAT6 MUT was gain-of-function by serial replating phenotype in pre-B CFU assays. Expression of STAT6 MUT enhanced IL-4 induced FCER2 /CD23, CCL17 and CCL22 expression and was associated with nuclear accumulation of pSTAT6. RNA sequencing identified PARP14 -a transcriptional switch and co-activator of STAT6- among the top differentially upregulated genes in IL-4 stimulated STAT6 MUT lymphoma cells and in STAT6 MUT primary FL cells. Quantitative chromatin immunoprecipitation (qChIP) demonstrated binding of STAT6 MUT but not STAT6 WT to the PARP14 promotor. Reporter assays showed increased IL-4 induced transactivation activity of STAT6 MUT at the PARP14 promotor, suggesting a self-reinforcing regulatory circuit. Knock-down of PARP14 or PARP-inhibition abrogated the STAT6 MUT gain-of-function phenotype. Thus, our results identify PARP14 as a novel therapeutic target in STAT6 MUT FL.
ISSN:0887-6924
1476-5551
DOI:10.1038/s41375-022-01641-x