Nutrition Frontiers - Summer 2018

Date Posted: 

Thursday, August 2, 2018


Dear Colleague,

The summer issue of Nutrition Frontiers showcases vitamin D-related genetic variation and cancer risk, the therapeutic potential of zerumbone, a ginger extract, against hepatocellular cancer, and the temporal efficacy of sulforaphane-based broccoli sprouts. Meet our spotlight investigator, Dr. JoAnn Manson, and her research on nutrition and lifestyle factors related to cancer and cardiovascular disease. Learn about passion fruit, the dimpled fruit that packs in the punch, upcoming announcements and more.

RESEARCH UPDATE: ON THE CLINICAL FRONT

Vitamin D Genetic Risk Score and Cancer Risk

A collection of foods high in Vitamin D.Several observational studies indicate an inverse association between circulating 25-hydroxyvitamin D (25OHD) and cancer incidence and a person’s genetic background may contribute to this association. Mendelian randomization studies of single nucleotide polymorphisms (SNPs) influencing plasma levels of 25OHD can be used to investigate the effect of lifelong differences in 25OHD and risk of cancer. In a cohort of 1782 women from the Women’s Genome Health Study who had previously available 25OHD measurements and genotype data, Chandler and colleagues derived a genetic risk score (GRS) based on five SNPs known to influence plasma levels of 25OHD in the DHCR7, CYP2R1, and GC genes. Although the GRS was associated with circulating 25OHD in the lowest versus the highest quintile of the GRS, none of the SNPs were associated with incident total, breast, colorectal or lung cancers or total mortality. Future research is needed to investigate the efficacy of vitamin D supplementation in reducing cancer risk and the role of vitamin D-related genetic variation in the setting of vitamin D supplementation.

Announcements

Applications are now open for NCI’s Cancer Prevention Fellowship Program! Application period May 1-August 25.

Upcoming Events

September 13-14, 2018
Enhancing Natural Product Clinical Trials workshop
Office of Dietary Supplements
National Institutes of Health
Bethesda, MD

September 30-October 3, 2018
12th Congress of the International Society of Nutrigenetics / Nutrigenomics
Winnipeg, Canada

October 8-9, 2018
8th Annual International Breast Cancer & Nutrition (IBCN) Symposium
West Lafayette, IN

October 9, 2018
Current Status and Response to the Global Obesity Pandemic: A Workshop
Food and Nutrition Board
Health and Medicine Division
National Academies of Science
Engineering and Medicine
Washington, DC and webcast

October 20-23, 2018
Food & Nutrition Conference & Expo
Academy of Nutrition and Dietetics
Washington, DC

November 7-9, 2018 
Personalized Nutrition 2018: Translate the Science of Nutrigenomics into Practice
American College of Nutrition
Seattle, WA

RESEARCH UPDATE: WHAT’S NEW IN BASIC SCIENCE

Zerumbone, a Ginger Extract, Suppresses Hepatocarcinogenesis

A bunch of ginger root.Zerumbone, a dietary compound derived from the ginger plant, exhibits anticancer activities in serval tumor models. Zerumbone’s antiproliferative and anti-inflammatory activities act through the modulation of NFκB activity. Here, Wani and colleagues investigate the therapeutic potential of zerumbone against hepatocellular carcinoma (HCC). Although control cells were minimally affected, Zerumbone inhibited proliferation and clonogenic survival of HCC cells in a dose-dependent manner by arresting cells at the G2-M phase and inducing apoptosis. Gene expression profiling revealed that zerumbone treatment resulted in significant deregulation of genes regulating apoptosis, cell cycle, and metabolism. Further, there was significant suppression of glucose consumption and reduction of lactate production, suggesting glycolytic inhibition. In immunocompromised mice, zerumbone treatment suppressed subcutaneous and orthotopic growth and lung metastasis of HCC xenografts. Zerumbone’s impact on cell cycle, apoptosis, and metabolic processes suggests further investigation into zerumbone as a strategy for preventing or treating HCC may be warranted.

Temporal Efficacy of Sulforaphane-Based Broccoli Sprouts

Broccoli sproutsSulforaphane (SFN), an isothicyanate found in cruciferous vegetables including broccoli sprouts (BSp), has been shown to modulate epigenetic pathways in vitro and in vivo and reduce the risk of breast cancer. Li and colleagues investigated temporal transplacental effects of a customized enriched 26% BSp diet (4 cups/day of BSp) and a TestDiet (all dietary ingredients except BSp) in SV40 and Her2/neu transgenic mouse models prenatally, postnatal early-life (before puberty) and in adults.  Tumor latencies were significantly lengthened in SV40 (10.34%) and Her2/neu mice (30.83%) administered a prenatal/materal BSp diet compared to 4.9% and 18.8%, respectively, when given at the beginning of postnatal early-life stage.  The prenatal/maternal BSp treatment resulted in maximal inhibition of breast cancer incidence in the offspring of transgenic mice compared to postnatal early-life exposure, which was more effective than adult exposure.  Further studies are warranted to evaluate an efficient lifespan temporal pattern for epigenetic-modifying dietary compounds and natural bioactive diets in breast cancer prevention.

SPOTLIGHT INVESTIGATOR: JOANN MANSON

Portrait of JoAnn E. Manson, MD, DrPH.JoAnn E. Manson, MD, DrPH is Chief of the Division of Preventive Medicine at Brigham and Women's Hospital (BWH), Professor of Medicine and the Michael and Lee Bell Professor of Women’s Health at Harvard Medical School, and Professor in the Department of Epidemiology, Harvard T.H. Chan School of Public Health. Dr. Manson is an endocrinologist and physician epidemiologist and is an elected member of the National Academy of Medicine and the Association of American Physicians. Her primary research interests include randomized clinical prevention trials of nutritional and lifestyle factors related to cancer and cardiovascular disease and the role of endogenous and exogenous estrogens as determinants of chronic disease outcomes. Dr. Manson is the Principal Investigator of several research studies, including the VITamin D and OmegA-3 TriaL (VITAL); the Women’s Health Initiative Clinical Center In Boston; the COcoa Supplement and Multivitamin Outcomes Study (COSMOS), and the cardiovascular component of the Nurses’ Health Study. 

Read more about Dr. Manson

Did You Know? The Dimpled Passion Fruit Packs in the Punch

An image of passion fruit and a glass of passion fruit juice.The flavorful tropical passion fruit, Passiflora edulis, also known as granadilla, is a native of Southern America.  It is one of the original fruits in Hawaiian Punch and has long been appreciated globally in New Zealand and Australian jams and jellies, Venezuelan ice cream and Vietnamese smoothies.  Passion fruit’s thick skin makes up 50% of the fruit and houses carotenes in the yellow variety and mainly glucosides and flavonoids in the purple variety.  The edible seeds are packed with fiber and niacin and the fleshy pulp offers an aromatic flavor and a heathy punch of vitamins A and C, potassium, iron and the flavonoids β-carotene and β-cryptoxanthin. 

This summer try a ripe dimpled passion fruit in a variety of ways - simply cut in half and scoop the sweet and tart seedy pulp to eat fresh, add to smoothies or even mix into a green or fruit salad.  Consider spooning on ice cream or over cheesecake to add a little crunch.  For a cool refreshing drink concoct your own Hawaiian punch simply by diluting the pulp with water, orange or pineapple juice, ice and sweeten to taste!

References: