Multi-Kinase Inhibitor with Anti-p38γ Activity in Cutaneous T-Cell Lymphoma

The Journal of Investigative Dermatology
Xu Hannah ZhangSteven T Rosen

Abstract

Current cutaneous T-cell lymphoma (CTCL) therapies are marked by an abbreviated response, subsequent drug resistance, and poor prognosis for patients with advanced disease. An understanding of molecular regulators involved in CTCL is needed to develop effective targeted therapies. One candidate regulator is p38γ, a mitogen-activated protein kinase crucial for malignant T-cell activity and growth. p38γ gene expression is selectively increased in CTCL patient samples and cell lines but not in healthy T cells. In addition, gene silencing of p38γ reduced CTCL cell viability, showing a key role in CTCL pathogenesis. Screening p38γ inhibitors is critical for understanding the mechanism of CTCL tumorigenesis and developing therapeutic applications. We prioritized a potent p38γ inhibitor (F7, also known as PIK75) through a high-throughput kinase inhibitor screen. At nanomolar concentrations, PIK75, a multiple kinase inhibitor, selectively killed CD4+ malignant CTCL cells but spared healthy CD4+ cells; induced significant reduction of tumor size in mouse xenografts; and effectively inhibited p38γ enzymatic activity and phosphorylation of its substrate, DLGH1, in CTCL cells and mouse xenografts. Here, we report that PIK75 has a potential...Continue Reading

Citations

Aug 10, 2019·Expert Opinion on Investigational Drugs·Egle RamelyteEmmanuella Guenova

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Methods Mentioned

BETA
transfection
NMR
xenograft
xenografts
PCR
Assay

Software Mentioned

CalcuSyn
Schrödinger
nSolver
NMRPipe
NanoString
GraphPad Prism
Sparky
R
Glide
GraphPad

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