Functional inhibition of BCL2 is needed to increase the susceptibility to apoptosis to SMO inhibitors in diffuse large B-cell lymphoma of germinal center subtype

Kranthi Kunkalla, Yadong Liu, Changju Qu, Vasiliki Leventaki, Nitin K. Agarwal, Rajesh R. Singh, Francisco Vega

Research output: Contribution to journalArticle

10 Scopus citations

Abstract

Previously, we have demonstrated that inhibition of Hedgehog pathway induces predominantly apoptosis in diffuse large B-cell lymphoma (DLBCL) cell lines of activated B-cell (ABC) type but predominantly cell cycle arrest in those of germinal center (GC). Here, we explored the possibility of overcoming the resistance to apoptosis to SMO inhibitors in five DLBCL cells of GC type using the combination of the SMO inhibitor HhAntag (Genentech Inc) with the BH3 mimetic ABT-737 (Abbott Laboratories). As controls we have used two DLBCL of ABC type (OCI-LY10 and OCI-LY3). Combinatorial treatments were performed with increasing concentrations of the HhAntag with low doses (equal or less than the IC20) of ABT-737. MTS assays were used to detect changes in cell viability and Annexin-V and PARP1 cleavage assays were used to detect apoptosis. Combining low doses of ABT-737 with increasing concentrations of HhAntag in GC DLBCL cell lines resulted in significantly increase of apoptosis in comparison to treatments with the SMO inhibitor alone. We concluded that in GC DLBCL cell lines, in contrast to those of ABC type, functional inhibition of BCL2 family members is usually needed to overcome the resistance to apoptosis to SMO inhibitors. These findings provide a rationale to explore the use of SMO and BCL2 inhibitors as adjuvant therapy for treatment of DLBCL of GC type.

Original languageEnglish (US)
Pages (from-to)777-787
Number of pages11
JournalAnnals of hematology
Volume92
Issue number6
DOIs
StatePublished - Jun 1 2013
Externally publishedYes

Keywords

  • ABT-737
  • BH3 mimetics
  • Diffuse large B-cell lymphoma
  • Hedgehog signaling
  • HhAntag
  • Smoothened (SMO) inhibitors

ASJC Scopus subject areas

  • Hematology

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