Synergistic effects of multiple natural products in pancreatic cancer cells.
Pancreatic cancer (PC) remains the fourth most common cause of cancer related death in the United States. Therefore, novel strategies for the prevention and treatment are urgently needed. Numerous dietary and pharmacological agents have been proposed as alternative strategies for the prevention and/or treatment of PC. Isoflavone is a prominent flavonoid found in soy products and has been proposed to be responsible for lowering the incidence of PC in Asians. Similarly, curcumin, an active ingredient of turmeric, that inhibits growth of malignant neoplasms, has a promising role in the prevention and/or treatment of PC. Here we examined whether isoflavone together with curcumin could elicit a greater inhibition of growth of PC cells than either agent alone, and also sought to determine the molecular mechanism of action. We found that the inhibition of cell growth and induction of apoptosis was significantly greater in the combination group than that could be achieved by either agent alone. These changes were associated with decreased Notch-1 expression and DNA binding activity of NF-kappaB and its target genes such as Cyclin D1, Bcl-2, and Bcl-xL. Moreover, we found that the combination of four natural agents at lower concentration was much more effective. Collectively, our results suggest that diet containing multiple natural products should be preferable over single agents for the prevention and/or treatment of PC. The superior effects of the combinatorial treatment could partly be attributed to the inhibition of constitutive activation of Notch-1 and NF-kappaB signaling pathways.
Wang
Zhiwei
Z
Department of Pathology, Karmanos Cancer Institute, Wayne State University, Detroit, Michigan, United States.
Desmoulin
Sita
S
Banerjee
Sanjeev
S
Kong
Dejuan
D
Li
Yiwei
Y
Deraniyagala
Rohan L
RL
Abbruzzese
James
J
Sarkar
Fazlul H
FH
D000971:Antineoplastic Combined Chemotherapy Protocols / Q000494:pharmacology* / Q000627:therapeutic use; D017209:Apoptosis / Q000187:drug effects*; D001208:Asia / Q000453:epidemiology; D044466:Asian People; D045744:Cell Line, Tumor; D003474:Curcumin / Q000494:pharmacology*; D004341:Drug Evaluation; D004354:Drug Screening Assays, Antitumor / Q000379:methods; D004357:Drug Synergism; D006801:Humans; D015994:Incidence; D007529:Isoflavones / Q000819:agonists / Q000494:pharmacology* / Q000627:therapeutic use; D009363:Neoplasm Proteins / Q000378:metabolism*; D010190:Pancreatic Neoplasms / Q000453:epidemiology / Q000208:ethnology / Q000517:prevention & control*; D015398:Signal Transduction / Q000187:drug effects*
D007529:Isoflavones; D009363:Neoplasm Proteins; D003474:Curcumin