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- 저자 : Dewhirst, Mark W. (검색결과 3 건)
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Maria Azrad,Robin T. Vollmer,John Madden,Mark Dewhirst,Thomas J. Polascik,Denise C. Snyder,Mack T. Ruffin,Judd W. Moul,Dean E. Brenner,Wendy Demark-Wahnefried 한국식품영양과학회 2013 Journal of medicinal food Vol.16 No.4
Enterolactone and enterodiol, mammalian lignans derived from dietary sources such as flaxseed, sesame seeds, kale, broccoli, and apricots, may impede tumor proliferation by inhibiting activation of nuclear factor kappa B (NFκB) and vascular endothelial growth factor (VEGF). We examined the associations between urinary enterolactone and enterodiol with prostatic tumor expression of NFκB, VEGF, and Ki67 among 147 patients with prostate cancer who participated in a presurgical trial of flaxseed supplementation (30 g/day) for 30 days. Urinary enterolignans and tissue biomarkers were determined by high-performance liquid chromatography and immunohistochemistry, respectively. After supplementation, we observed significant correlations between intakes of plant lignan and urinary concentrations of total enterolignans (ρ=0.677, P<.0001), enterolactone (ρ=0.676, P<.0001), and enterodiol (ρ=0.628, P<.0001). Importantly, we observed that total urinary enterolignans and enterolactone were significantly and inversely correlated with Ki67 in the tumor tissue (ρ=−0.217, P=.011, and ρ=−0.230, P=.007, respectively), and a near-significant inverse association was observed for enterodiol (ρ=−0.159, P=.064). An inverse association was observed between enterolactone and VEGF (ρ=−0.143, P=.141), although this did not reach statistical significance. We did not observe an association between enterolignans and NFκB. In conclusion, flaxseed-derived enterolignans may hinder cancer cell proliferation via VEGF-associated pathways.
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Kurokawa, Manabu,Kim, Jiyeon,Geradts, Joseph,Matsuura, Kenkyo,Liu, Liu,Ran, Xu,Xia, Wenle,Ribar, Thomas J.,Henao, Ricardo,Dewhirst, Mark W.,Kim, Wun-Jae,Lucas, Joseph E.,Wang, Shaomeng,Spector, Neil L AAAS 2013 Science signaling Vol.6 No.274
<P><B>Breaking Down to Build Resistance</B></P><P>Chemotherapeutic resistance often arises because of the rewiring of signaling pathways in cancer cells. Kurokawa <I>et al.</I> found that the ubiquitin E3 ligase MDM2 triggered the breakdown of another ubiquitin E3 ligase, HUWE1. In breast cancer cells that died when exposed to the HER2 (human epidermal growth factor receptor 2) EGFR (epidermal growth factor receptor) tyrosine kinase inhibitor lapatinib, MDM2 was degraded, which enabled HUWE1 to trigger the degradation of a prosurvival protein and promote assembly and activation of a protein complex required for the execution of cell death. However, MDM2 degradation did not occur in lapatinib-resistant breast cancer cells, and thus, the abundance of HUWE1 was decreased, promoting cell survival. In a mouse xenograft model, an inhibitor of MDM2 reduced the growth of tumors generated from lapatinib-resistant breast cancer cells. Thus, MDM2 could be targeted to circumvent resistance to lapatinib in breast cancers.</P>
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Kwon, Do-Yeon,Lee, Hye Eun,Weitzel, Douglas H.,Park, Kyunghye,Lee, Sun Hee,Lee, Chen-Ting,Stephenson, Tesia N.,Park, Hyeri,Fitzgerald, Michael C.,Chi, Jen-Tsan,Mook Jr., Robert A.,Dewhirst, Mark W.,Le American Chemical Society 2015 Journal of medicinal chemistry Vol.58 No.19
<P/><P>To cope with hypoxia, tumor cells have developed a number of adaptive mechanisms mediated by hypoxia-inducible factor 1 (HIF-1) to promote angiogenesis and cell survival. Due to significant roles of HIF-1 in the initiation, progression, metastasis, and resistance to treatment of most solid tumors, a considerable amount of effort has been made to identify HIF-1 inhibitors for treatment of cancer. Isolated from <I>Saururus cernuus</I>, manassantins A (<B>1</B>) and B (<B>2</B>) are potent inhibitors of HIF-1 activity. To define the structural requirements of manassantins for HIF-1 inhibition, we prepared and evaluated a series of manassantin analogues. Our SAR studies examined key regions of manassantin’s structure in order to understand the impact of these regions on biological activity and to define modifications that can lead to improved performance and drug-like properties. Our efforts identified several manassantin analogues with reduced structural complexity as potential lead compounds for further development. Analogues <B>MA04</B>, <B>MA07</B>, and <B>MA11</B> down-regulated hypoxia-induced expression of the HIF-1α protein and reduced the levels of HIF-1 target genes, including cyclin-dependent kinase 6 (Cdk6) and vascular endothelial growth factor (VEGF). These findings provide an important framework to design potent and selective HIF-1α inhibitors, which is necessary to aid translation of manassantin-derived natural products to the clinic as novel therapeutics for cancers.</P>
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