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Inhibitory effect on activator protein-1, nuclear factor-kappaB, and cell transformation by extracts of strawberries (Fragaria x ananassa Duch.).

Authors
Wang-SY; Feng-RT; Lu-YJ; Bowman-L; Ding-M
Source
J Agric Food Chem 2005 May; 53(10):4187-4193
NIOSHTIC No.
20026912
Abstract
The inhibitory effects of strawberry (Fragaria x ananassa Duch.) antioxidant enzymes on tetradecanoylphorbol-13-acetate (TPA) or ultraviolet-B (UVB) induced activator protein-1 (AP-1) and nuclear factor-kappaB (NF-kappaB) were studied. The inhibitory effects of strawberry extracts on the proliferation and transformation of human and mouse cancer cells were also evaluated. Strawberries had high activities of glutathione peroxidase, superoxide dismutase, guaiacol peroxidase, ascorbate peroxidase, and glutathione reductase. Strawberry extracts inhibited the proliferation of human lung epithelial cancer cell line A549 and decreased TPA-induced neoplastic transformation of JB6 P+ mouse epidermal cells. Pretreatment of JB6 P+ mouse epidermal cells with strawberry extract resulted in the inhibition of both UVB- and TPA-induced AP-1 and NF-kappaB transactivation. Furthermore, strawberry extract also blocked TPA-induced phosphorylation of extracellular signal-regulated kinases (ERKs) and UVB-induced phosphorylation of ERKs and JNK kinase in JB6 P+ mouse epidermal cell culture. These results suggest that the ability of strawberries to block UVB- and TPA-induced AP-1 and NF-kappaB activation may be due to their antioxidant properties and their ability to reduce oxidative stress. The oxidative events that regulate AP-1 and NF-kappaB transactivation can be important molecular targets for cancer prevention. The strawberries may be highly effective as a chemopreventive agent that acts by targeting the down-regulation of AP-1 and NF-kappaB activities, blocking MAPK signaling, and suppressing cancer cell proliferation and transformation.
Keywords
Cell-transformation; Antioxidants; Antioxidation; Enzymes; Laboratory-animals; Animals; Animal-studies; Humans; Cancer; Lung-cells; Lung-cancer; Pulmonary-system-disorders; Respiratory-system-disorders
CODEN
JAFCAU
Publication Date
20050518
Document Type
Journal Article
Email Address
wangs@ba.ars.usda.gov
Fiscal Year
2005
NTIS Accession No.
NTIS Price
Issue of Publication
10
ISSN
0021-8561
NIOSH Division
HELD
Priority Area
Research Tools and Approaches: Cancer Research Methods
Source Name
Journal of Agricultural and Food Chemistry
State
WV; MD
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