Targeting sphingosine kinase induces apoptosis and tumor regression for KSHV-associated primary effusion lymphoma

Zhiqiang Qin, Lu Dai, Jimena Trillo-Tinoco, Can Senkal, Wenxue Wang, Tom Reske, Karlie Bonstaff, Luis Del Valle, Paulo Rodriguez, Erik Flemington, Christina Voelkel-Johnson, Charles D. Smith, Besim Ogretmen, Chris Parsons

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35 Scopus citations

Abstract

Sphingosine kinase (SPHK) is overexpressed by a variety of cancers, and its phosphorylation of sphingosine results in accumulation of sphingosine-1- phosphate (S1P) and activation of antiapoptotic signal transduction. Existing data indicate a role for S1P in viral pathogenesis, but roles for SPHKand S1P in virus-associated cancer progression have not been defined. Rare pathologic variants of diffuse large B-cell lymphoma arise preferentially in the setting of HIV infection, including primary effusion lymphoma (PEL), a highly mortal tumor etiologically linked to the Kaposi's sarcoma-associated herpesvirus (KSHV).Wehave found that ABC294640, a novel clinical-grade small molecule selectively targeting SPHK (SPHK2 >: SPHK1), induces dose-dependent caspase cleavage and apoptosis for KSHV+ patient-derived PEL cells, in part through inhibition of constitutive signal transduction associated with PEL cell proliferation and survival. These results were validated with induction of PEL cell apoptosis using SPHK2-specific siRNA, as well as confirmation of drug-induced SPHK inhibition in PEL cells with dose-dependent accumulation of proapoptotic ceramides and reduction of intracellular S1P. Furthermore, we demonstrate that systemic administration of ABC294640 induces tumor regression in an established human PEL xenograft model. Complimentary ex vivo analyses revealed suppression of signal transduction and increased KSHV lytic gene expression within drug-treated tumors, with the latter validated in vitro through demonstration of dose-dependent viral lytic gene expression within PEL cells exposed to ABC294640. Collectively, these results implicate interrelated mechanisms and SPHK2 inhibition in the induction of PEL cell death by ABC294640 and rationalize evaluation of ABC294640 in clinical trials for the treatment of KSHV-associated lymphoma.

Original languageEnglish (US)
Pages (from-to)154-164
Number of pages11
JournalMolecular cancer therapeutics
Volume13
Issue number1
DOIs
StatePublished - Jan 2013

All Science Journal Classification (ASJC) codes

  • Oncology
  • Cancer Research

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    Qin, Z., Dai, L., Trillo-Tinoco, J., Senkal, C., Wang, W., Reske, T., Bonstaff, K., Valle, L. D., Rodriguez, P., Flemington, E., Voelkel-Johnson, C., Smith, C. D., Ogretmen, B., & Parsons, C. (2013). Targeting sphingosine kinase induces apoptosis and tumor regression for KSHV-associated primary effusion lymphoma. Molecular cancer therapeutics, 13(1), 154-164. https://doi.org/10.1158/1535-7163.MCT-13-0466