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JAK3 Is Expressed in the Nucleus of Malignant T Cells in Cutaneous T Cell Lymphoma (CTCL)
| Content Provider | MDPI |
|---|---|
| Author | Vadivel, Chella Gluud, Maria Torres-Rusillo, Sara Boding, Lasse Willerslev-Olsen, Andreas Buus, Terkild Nielsen, Tea Persson, Jenny Bonefeld, Charlotte Geisler, Carsten Krejsgaard, Thorbjorn Fuglsang, Anja Odum, Niels Woetmann, Anders |
| Copyright Year | 2021 |
| Description | Perturbation in JAK-STAT signaling has been reported in the pathogenesis of cutaneous T cell lymphoma (CTCL). JAK3 is predominantly associated with the intra-cytoplasmic part of IL-2Rγc located in the plasma membrane of hematopoietic cells. Here we demonstrate that JAK3 is also ectopically expressed in the nucleus of malignant T cells. We detected nuclear JAK3 in various CTCL cell lines and primary malignant T cells from patients with Sézary syndrome, a leukemic variant of CTCL. Nuclear localization of JAK3 was independent of its kinase activity whereas STAT3 had a modest effect on nuclear JAK3 expression. Moreover, JAK3 nuclear localization was only weakly affected by blockage of nuclear export. An inhibitor of the nuclear export protein CRM1, Leptomycin B, induced an increased expression of SOCS3 in the nucleus, but only a weak increase in nuclear JAK3. Importantly, immunoprecipitation experiments indicated that JAK3 interacts with the nuclear protein POLR2A, the catalytic subunit of RNA Polymerase II. Kinase assays showed tyrosine phosphorylation of recombinant human Histone H3 by JAK3 in vitro—an effect which was blocked by the JAK inhibitor (Tofacitinib citrate). In conclusion, we provide the first evidence of nuclear localization of JAK3 in malignant T cells. Our findings suggest that JAK3 may have a cytokine-receptor independent function in the nucleus of malignant T cells, and thus a novel non-canonical role in CTCL. |
| Starting Page | 280 |
| e-ISSN | 20726694 |
| DOI | 10.3390/cancers13020280 |
| Journal | Cancers |
| Issue Number | 2 |
| Volume Number | 13 |
| Language | English |
| Publisher | MDPI |
| Publisher Date | 2021-01-14 |
| Access Restriction | Open |
| Subject Keyword | Cancers Dermatology Pathology Jak3 Cutaneous T Cell Lymphoma Mycosis Fungoides Sézary Syndrome Tyrosine Kinases |
| Content Type | Text |
| Resource Type | Article |
