Abstract
Objective: Based on promising in vitro and in vivo activity of several histone deacetylase inhibitors in Hodgkin lymphoma (HL), we investigated SNDX-275, an oral class 1 isoform-selective histone deacetylase inhibitors in HL-derived cell lines. Materials and Methods: Proliferation and cell death were examined by MTS assay, Annexin V/propidium iodide, and fluorescence-activated cell sorting analysis. Gene and protein expression were measured by reverse transcriptase polymerase chain reaction, Western blotting, and immunohistochemical analysis. A multiplex assay was used to determine cytokines and chemokines. Results: SNDX-275 induced cell death in a dose- and time-dependent manner with an IC50 at the sub- and lower micromolar range at 72 hours. At the molecular level, SNDX-275 increased histone H3 acetylation, upregulated p21 expression, and activated the intrinsic apoptosis pathway by downregulating the X-linked inhibitor of apoptosis protein. SNDX-275 downregulated expression of antiapoptotic Bcl-2 and Bcl-xL proteins without altering Mcl-1 or Bax levels. Combination studies demonstrated that two Bcl-2 inhibitors (ABT-737 and obatoclax) significantly enhanced the effect of SNDX-275. SNDX-275 modulated the level of several cytokines and chemokines, including interleukin-12 p40-70, interferon-inducible protein-10, RANTES (regulated on activation, normal T expressed and secreted), interleukin-13, interleukin-4, and thymus and activation-regulated chemokine and variably induced the cancer/testis antigen expression of MAGE-A4 and survivin in HL cell lines. Conclusions: SNDX-275 has antiproliferative activity in HL cell lines, involving several mechanisms: induction of apoptosis, regulation of cytokines and chemokines, and alteration of cancer/testis antigens. Clinical investigation of SNDX-275 alone or in combination with Bcl-2 inhibitors is warranted in patients with HL. Phase 2 studies with SNDX-275 in HL are ongoing, and future clinical studies should investigate combinations with SNDX-275.
Original language | English (US) |
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Pages (from-to) | 1007-1017.e1 |
Journal | Experimental Hematology |
Volume | 39 |
Issue number | 10 |
DOIs | |
State | Published - Oct 2011 |
Funding
This research is supported in part by the National Institutes of Health (NIH) through M.D. Anderson’s Cancer Center Support Grant CA016672 , NCI Lymphoma SPORE grant 1P50CA136411-01A1 , The Living Legend Fund, and the Prince Fund for Lymphoma (Anas Younes), by NIH grant P50 CA126752 , the Gillson Longenbaugh Foundation, and the M.D. Anderson Foundation (Catherine M. Bollard), and by The Hungarian American Enterprise Scholarship Fund (Ádám Jóna).
ASJC Scopus subject areas
- Molecular Biology
- Hematology
- Genetics
- Cell Biology
- Cancer Research