Integrin alphaV beta3 activation by thyroid hormones triggers JAK/STAT oncogenic pathways that promote T cell lymphoma dissemination

DEBERNARDI M; REVUELTA MV; STERLE HA; GONZALEZ G; INGRID LM SOUZA; CORREA DOMINGUEZ A; CERCHIETTI LC; CREMASCHI G; CAYROL F

Congreso; AACR Anual meeting 2024; 2024

Background. T cell lymphomas (TCL) are a heterogeneous group of lymphoproliferative disorders with poor prognosis. Aberrant activation of JAK/STAT pathway is associated with lymphoma dissemination in TCL patients. Although the FDA approved the use of inhibitors to target this pathway (Ruxolitinib), significant toxic effects have been reported and their use is limited. Thus making an excellent opportunity to study biological factors that regulate the activation of these pathways. In this sense, we recently showed that thyroid hormones (THs) acting through integrin αVβ3 induced TCL proliferation, which is reduced in vitro and in vivo in the presence of integrin αVβ3 pharmacological inhibitor. Objective. Our aim is to evaluate the impact of THs on JAK/STAT pathway activation and their implications on anti-lymphoma therapy.Experimental procedures. For the in vitro assays we used human (CUTLL1, OCI-Ly12, OCI-Ly13.2) and murine (EL4) TCL cell lines. We used EL4 cells and c57bl/6 syngeneic mice for in vivo analysis. Proteomic profiles were evaluated by LC-MS-MS analysis. The GSE58445 database was used for in silico analysis. Results. We found that THs induced STAT1, 3 and 5 phosphorylation in TCL cells and that the integrin αVβ3 inhibitor, Cilengitide (Cile) blunted these effects (p