Inhibition of N-myc expression sensitizes human neuroblastoma IMR-32 cells expressing caspase-8 to TRAIL.

Abstract:

OBJECTIVES:This study aims to explore the roles of N-myc and caspase-8 in TRAIL-resistant IMR-32 cells which exhibit MYCN oncogene amplification and lack caspase-8 expression. MATERIALS AND METHODS:We established N-myc-downregulated IMR-32 cells using shRNA lentiviral particles targeting N-myc and examined the effect the N-myc inhibition on TRAIL susceptibility in human neuroblastoma IMR-32 cells expressing caspase-8. RESULTS:Cisplatin treatment in IMR-32 cells increased the expression of death receptor 5 (DR5; TRAIL-R2), but not other receptors, via downregulation of NF-κB activity. However, the cisplatin-mediated increase in DR5 failed to induce cell death following TRAIL treatment. Furthermore, interferon (IFN)-γ pretreatment increased caspase-8 expression in IMR-32 cells, but cisplatin failed to trigger TRAIL cytotoxicity. We downregulated N-myc expression in IMR-32 cells using N-myc-targeting shRNA. These cells showed decreased growth rate and Bcl-2 expression accompanied by a mild collapse in the mitochondrial membrane potential as compared with those treated with scrambled shRNA. TRAIL treatment in N-myc-negative cells expressing caspase-8 following IFN-γ treatment significantly triggered apoptotic cell death. Concurrent treatment with cisplatin enhanced TRAIL-mediated cytotoxicity, which was abrogated by an additional pretreatment with DR5:Fc chimera protein. CONCLUSIONS:N-myc and caspase-8 expressions are involved in TRAIL susceptibility in IMR-32 cells, and the combination of treatment with cisplatin and TRAIL may serve as a promising strategy for the development of therapeutics against neuroblastoma that is controlled by N-myc and caspase-8 expression.

journal_name

Cell Prolif

journal_title

Cell proliferation

authors

Lee MW,Kim DS,Kim HR,Park HJ,Lee JW,Sung KW,Koo HH,Yoo KH

doi

10.1111/cpr.12577

subject

Has Abstract

pub_date

2019-05-01 00:00:00

pages

e12577

issue

3

eissn

0960-7722

issn

1365-2184

journal_volume

52

pub_type

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