Orphan nuclear receptor, Nurr-77 was a possible target gene of butylidenephthalide chemotherapy on glioblastoma multiform brain tumor

Journal of Neurochemistry
Po Cheng LinHorng Jyh Harn

Abstract

The natural compound n-butylidenephthalide (BP), which is isolated from the chloroform extract of Angelica sinensis, has been investigated for its antitumoral effects on glioblastoma multiform (GBM) brain tumors both in vitro and in vivo. To determine the mechanism of BP-induced growth arrest and apoptosis, we examined BP-induced changes in gene expression by microarray screening using human GBM brain tumor cells. This analysis identified several BP-inducible genes, including the nuclear receptors NOR-1, Nurr1, and Nur77. Among these genes, Nur77 is particularly interesting because it plays an important role in the apoptotic processes in various tumor cell lines. BP was able to increase Nur77 mRNA and protein expression in a time-dependent manner. After BP treatment in GBM 8401 cells, Nur77 translocated from the nucleus to the cytoplasm, the cytochrome c was released from the mitochondria, and caspase 3 became activated. Furthermore, using Nur77 promoter-luciferase assay, BP increased Nur77 was AP1 related. Inhibition of BP-induced Nur77 expression by Nur77 short interfering RNA blocked BP-induced apoptosis in GBM 8401 cells, suggesting that the induction of Nur77 negatively affected GBM 8401 cell survival. In summary, our resu...Continue Reading

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Apoptosis

Apoptosis is a specific process that leads to programmed cell death through the activation of an evolutionary conserved intracellular pathway leading to pathognomic cellular changes distinct from cellular necrosis