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Bcl-2 is a key regulator for the retinoic acid-induced apoptotic cell death in neuroblastoma

Abstract

Retinoic acid (RA) has been shown to induce neuronal differentiation and/or apoptosis, and is widely used as a chemotherapeutic agent for treating the patients with neuroblastoma. However, the therapeutic effect of RA is still limited. To unveil the molecular mechanism(s) inducing differentiation and apoptosis in neuroblastoma cells, we compared CHP134 and NB-39-nu cell lines, in which all-trans-RA (ATRA) induces apoptosis, with LA-N-5 and RTBM1 cell lines, in which it induces neuronal differentiation. Here, we found that Bcl-2 was strongly downregulated in CHP134 and NB-39-nu cells, whereas it was abundantly expressed in LA-N-5 and RTBM1 cells. ATRA-mediated apoptosis in CHP134 and NB-39-nu cells was associated with a significant activation of caspase-9 and caspase-3 as well as cytoplasmic release of cytochrome c from mitochondria in a p53-independent manner. Enforced expression of Bcl-2 significantly inhibited ATRA-mediated apoptosis in CHP134 cells. In addition, treatment of RTBM1 cells with a Bcl-2 inhibitor, HA14-1, enhanced apoptotic response induced by ATRA. Of note, two out of 10 sporadic neuroblastomas expressed bcl-2 at undetectable levels and underwent cell death in response to ATRA in primary cultures. Thus, our present results suggest that overexpression of Bcl-2 is one of the key mechanisms to give neuroblastoma cells the resistance against ATRA-mediated apoptosis. This may provide a new therapeutic strategy against the ATRA-resistant and aggressive neuroblastomas by combining treatment with ATRA and a Bcl-2 inhibitor.

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Acknowledgements

We are grateful to the hospitals and institutions that provided us with surgical specimens. We thank Hideki Yamamoto and Atsushi Kawasaki for valuable discussions, and Yuki Nakamura for excellent technical assistance. This work was supported in part by a Grant-in-Aid from the Ministry of Health, Labour and Welfare for Third Term Comprehensive Control Research for Cancer, and a Grant-in-Aid for Scientific Research on Priority Areas and a Grant-in-Aid for Scientific Research (C) from the Ministry of Education, Culture, Sports, Science and Technology, Japan.

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Correspondence to A Nakagawara.

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Niizuma, H., Nakamura, Y., Ozaki, T. et al. Bcl-2 is a key regulator for the retinoic acid-induced apoptotic cell death in neuroblastoma. Oncogene 25, 5046–5055 (2006). https://doi.org/10.1038/sj.onc.1209515

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