Combination therapy with AG-490 and interleukin 12 achieves greater antitumor effects than either agent alone.

Abstract:

:Constitutive activation of Janus kinases (JAKs) and signal transducers and activators of transcription (STAT) occurs at very high frequency in various hematopoietic malignancies and solid tumors. It has been demonstrated that the tyrosine kinase inhibitor, AG-490, selectively blocks JAK activity and completely eliminates leukemia cells in a severe combined immunodeficient (SCID) mouse model. Because many cytokines, including interleukin (IL)-12, have been shown to signal through JAK/STAT pathways, AG-490 may inhibit cytokine-based cancer therapy. In this study, we evaluated the effects of AG-490 on IL-12 functional signaling and IL-12-mediated antitumor response in vivo. Previous studies have established the critical roles of macrophages and IFN-gamma in mediating IL-12-induced antitumor effects. Our results show that in vivo administration of AG-490 causes tumor cell apoptosis but does not inhibit IL-12-mediated macrophage activation and IFN-gamma production by lymphocytes. Furthermore, our data indicate that combined therapy with AG-490 and IL-12-induces greater antitumor effects than either agent alone in a murine myeloma tumor model. These results suggest that JAK/STAT inhibitors deserve further investigation for use with IL-12 therapy in treating human cancers with elevated JAK/STAT activity.

journal_name

Mol Cancer Ther

authors

Burdelya L,Catlett-Falcone R,Levitzki A,Cheng F,Mora LB,Sotomayor E,Coppola D,Sun J,Sebti S,Dalton WS,Jove R,Yu H

keywords:

subject

Has Abstract

pub_date

2002-09-01 00:00:00

pages

893-9

issue

11

eissn

1535-7163

issn

1538-8514

journal_volume

1

pub_type

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