Indirubin-3'-oxime induces mitochondrial dysfunction and triggers growth inhibition and cell cycle arrest in human neuroblastoma cells

Liao,Xue-Mei; Leung,Kwok-Nam

doi:10.3892/or.2012.2094

Indirubin-3'-oxime induces mitochondrial dysfunction and triggers growth inhibition and cell cycle arrest in human neuroblastoma cells

Authors:
- Xue-Mei Liao
- Kwok-Nam Leung
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Affiliations: Biochemistry Programme, School of Life Sciences, The Chinese University of Hong Kong, Hong Kong, SAR, P.R. China
Published online on: October 19, 2012 https://doi.org/10.3892/or.2012.2094
Pages: 371-379

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Abstract

Neuroblastoma is the most common extracranial solid tumor found in infancy and childhood. Current multimodal therapies such as surgery, chemotherapy, radiotherapy and stem cell transplantation often cause inevitable severe side-effects, therefore, it is necessary to develop novel drugs with higher efficacy on neuroblastoma cells and minimal side-effects on normal cells. Indirubin-3'-oxime (I3M), an indigo alkaloid, was found to exhibit potent antitumor activities on various types of cancer cells. However, its modulatory effects on human neuroblastoma and the underlying mechanisms remain poorly understood. As mitochondrial biogenesis and function play critical roles in cell growth and survival, in the present study the effects of I3M on mitochondrial functions and their correlation to the anticancer effect of I3M on human neuroblastoma cells were investigated. I3M was found to inhibit the growth of the human neuroblastoma LA-N-1, SH-SY5Y and SK-N-DZ cells in a dose- and time-dependent manner, but exhibited little, if any, direct cytotoxicity on normal cells. Mechanistic studies showed that I3M specifically decreased the expression of the mitochondrial regulators ERRγ and PGC-1β and resulted in decreased mitochondrial mass and altered mitochondrial function characterized by a reduction in mitochondrial membrane potential and elevation of reactive oxygen species levels in LA-N-1 cells. I3M also increased the level of CDK inhibitor p27Kip1 and reduced the levels of CDK2 and cyclin E in LA-N-1 cells, leading to cell cycle arrest at the G0/G1 phase. Collectively, these results suggest that mitochondrial dysfunction might be an important mechanism underlying the I3M-induced cell cycle arrest.

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