title: Inhibition of cell growth and induction of apoptosis in non-small cell lung cancer cells by delta-tocotrienol is associated with notch-1 down-regulation.
abstract: Lung cancer is the leading cause of death among all cancers. Non-small cell lung cancer accounts for 80% of lung cancer with a 5-year survival rate of 16%. Notch pathway, especially Notch-1 is up-regulated in a subgroup of non-small cell lung cancer patients. Since Notch-1 signaling plays an important role in cell proliferation, differentiation, and apoptosis, down-regulation of Notch-1 may exert anti-tumor effects. The objective of this study was to investigate whether delta-tocotrienol, a naturally occurring isoform of Vitamin E, inhibits non-small cell lung cancer cell growth via Notch signaling. Treatment with delta-tocotrienol resulted in a dose and time dependent inhibition of cell growth, cell migration, tumor cell invasiveness, and induction of apoptosis. Real-time RT-PCR and western blot analysis showed that antitumor activity by delta-tocotrienol was associated with a decrease in Notch-1, Hes-1, Survivin, MMP-9, VEGF, and Bcl-XL expression. In addition, there was a decrease in NF-κB-DNA binding activity. These results suggest that down-regulation of Notch-1, via inhibition of NF-κB signaling pathways by delta-tocotrienol, could provide a potential novel approach for prevention of tumor progression in non-small cell lung cancer.
authors: Department of Nutrition and Food Science, Wayne State University, Detroit, Michigan, USA.
authors: Xiangming
authors: X
authors: Ji
authors: Zhiwei
authors: Z
authors: Wang
authors: Andreea
authors: A
authors: Geamanu
authors: Fazlul H
authors: FH
authors: Sarkar
authors: Smiti V
authors: SV
authors: Gupta