News flashes are posted here frequently to keep you up-to-date with the latest advances in health and longevity. We have an unparalleled track record of breaking stories about life extension advances.
Antioxidant combo improves inflammation in heart failure patients
April 15 2019. Results from double-blind, crossover study reported on April 9, 2019 at the American Physiological Society's (APS) annual meeting at Experimental Biology 2019 in Orlando revealed that the intake of three antioxidant compounds helped control inflammation and boost nitric oxide in heart failure patients with preserved ejection fraction.
Heart failure occurs when the heart fails to pump blood adequately. About half of those with heart failure have preserved (normal) ejection fraction, which is a measure of the percentage of blood ejected from the left ventricle with each heartbeat. In heart failure with preserved ejection fraction, the ventricle is unable to relax and fill properly.
Sixteen patients were given a placebo or a combination of 600 milligrams alpha lipoic acid, 1,000 milligrams vitamin C and 600 international units vitamin E, and assessments of large blood vessel and microvascular function were conducted. Subsequently, those who had received antioxidants were crossed over to the placebo group and participants in the placebo group were given antioxidants, followed by another assessment of vessel function.
Flow mediated dilation, a measure of large vessel function, improved following administration of antioxidants. Additionally, C-reactive protein (CRP), a marker of inflammation, declined, and biologically available nitric oxide (which helps the blood vessels dilate) increased following antioxidant supplementation.
The study is the first to evaluate the ability of antioxidants to improve peripheral vascular function in heart failure patients with preserved ejection fraction. “This study has identified the efficacy of an acute, over-the-counter dose of vitamins C, E, and alpha lipoic acid to mitigate vascular inflammation and improve conduit artery endothelium-dependent vasodilation in patients with heart failure with preserved ejection fraction, providing new insight into the mechanisms that govern peripheral vascular dysfunction in this patient group,” authors Stephen M. Ratchford and colleagues conclude.
Garlic supplementation could help older individuals maintain cognitive function
April 12 2019. Results from a study reported on April 8, 2019 at the American Physiological Society's annual meeting suggest a benefit for supplementing with the garlic compound allyl sulfide among older people who wish to maintain their cognitive abilities.
“Allyl sulfide, an organic sulfur compound in garlic, has many health benefits and is known for its detoxifying agents,” note authors Jyotirmaya Behera, Kimberly E. Kelly and Neetu Tyagi, PhD of the University of Louisville.
The team administered allyl sulfide, a compound found in garlic, to 24-month-old mice and compared them to four and 24-month-old mice that did not receive allyl sulfide. Older mice that received the compound demonstrated better short and long-term memory and spatial memory, in addition to healthier intestinal bacteria in comparison with untreated mice of the same age. "The diversity of the gut microbiota is diminished in elderly people, a life stage when neurodegenerative diseases such as Alzheimer's and Parkinson's develop and memory and cognitive abilities can decline," Dr Tyagi stated. "We want to better understand how changes in the gut microbiota relate to aging-associated cognitive decline."
Brains of mice that received allyl sulfate had greater expression of a gene known as neuronal-derived natriuretic factor (NDNF), which researchers at the University of Louisville recently determined was necessary for short and long-term memory consolidation. Delivery of recombinant NDNF protein to the brains of older mice that were not treated with allyl sulfate improved age-related cognitive decline. Furthermore, oral allyl sulfide administration was associated with gut production of hydrogen sulfide gas which protects against intestinal inflammation.
Allyl sulfide may support memory consolidation by restoring gut bacteria. "Our findings suggest that dietary administration of garlic containing allyl sulfide could help maintain healthy gut microorganisms and improve cognitive health in the elderly," Dr Behera concluded.
JAMA reports positive effects for vitamin D supplementation in cancers of the digestive tract
April 10 2019. The April 9, 2019 issue of the Journal of the American Medical Association (JAMA) reported results from two trials that revealed benefits for vitamin D supplementation in the treatment of digestive system cancers.
The SUNSHINE trial included 139 patients whose metastatic colorectal cancer was treated with chemotherapy. Seventy patients received 400 IU vitamin D and 69 received 4,000 IU vitamin D3 daily. Participants who received the higher dose of vitamin D experienced 13 months of progression-free survival compared to 11 months for those who were given the standard dose. "To our knowledge, this study is the first completed randomized clinical trial of vitamin D supplementation for treatment of advanced or metastatic colorectal cancer," stated first author Kimmie Ng, MD, MPH. "It identifies a cost-effective, safe, and easily accessible agent as a potential new treatment for metastatic colorectal cancer."
In the AMATERASU trial, 417 patients who underwent surgery for digestive tract cancers, which included cancers of the esophagus, stomach, small intestine, colon and rectum, received 2,000 IU vitamin D per day or a placebo. While unadjusted five-year relapse-free survival and overall survival were not significantly different between the groups, JAMA editorialists Elizabeth Barry and colleagues note that “The study had a treatment allocation imbalance for age, and post hoc age-adjusted analysis revealed a statistically significant benefit in favor of supplementation.”
In the accompanying editorial whose title asks the question, “Vitamin D as Cancer Therapy?” Dr Barry and associates conclude, “The SUNSHINE and AMATERASU clinical trials reported in this issue of JAMA provide new information regarding the potential use of vitamin D among patients with colorectal cancer and other luminal gastrointestinal malignancies. Confirmatory trials are needed to evaluate these preliminary findings, ideally with longer follow-up to obtain better estimates of effects on survival as well as biological measurements to clarify underlying mechanisms.”
Vitamin B12 could help patients with inherited Parkinson’s disease
Parkinson’s disease arises sporadically in most patients diagnosed with the disease. The majority of individuals with the inherited form as well as some people with sporadic forms have mutations in a gene that encodes the enzyme LRRK2. These mutations increase the gene’s kinase activity, which catalyzes a biochemical reaction known as phosphorylation. This hyperactivity of LRRK2 kinase is a cause of neurotoxicity that occurs in Parkinson’s disease. Although there are inhibitors of LRRK2’s kinase activity, they are associated with side effects or uncertain clinical results.
In the current study, Iban Ubarretxena-Belandia of the Biofisika Institute at the University of the Basque Country in Leioa, Spain and colleagues identified 5′-deoxyadenosylcobalamin (AdoCbl, a form of vitamin B12) as an inhibitor of LRRK2 kinase activity. Treatment of cultured cells and brain tissue with this form of vitamin B12 inhibited LRRK2 kinase activity. In cultured rodent neurons, and in roundworms and fruit flies that expressed LRRK2 mutations, the vitamin inhibited neurotoxicity. And in mouse models of inherited Parkinson’s disease, it alleviated deficits in the release of dopamine, a neurotransmitter whose production is diminished by Parkinson’s disease-induced neurodegeneration.
The discovery "constitutes a huge step forward because it is a neuroprotective vitamin in animal models and has a mechanism unlike that of currently existing inhibitors,” Dr Ubarretxena-Belandia stated. “So, it could be used as a basis to develop new therapies to combat hereditary Parkinson's associated with pathogenic variants of the LRRK2 enzyme.”
Severe vitamin D deficiency predicts mortality in cirrhosis patients during more than a year of follow-up
April 05 2019. Results from a meta-analysis published on March 29, 2019 in Clinical Research in Hepatology and Gastroenterology found an association between severe vitamin D deficiency in patients with cirrhosis of the liver and a significantly greater risk of dying during follow-up periods ranging from 147 to 419 days.
Researchers at First Affiliated Hospital of Chongqing Medical University selected eight studies that included a total of 1,339 men and women with liver cirrhosis for the meta-analysis. Study reports included subjects’ serum 25-hydroxyvitamin D levels and provided data concerning mortality from all causes. While vitamin D levels of less than 20 nanograms per milliliter (ng/mL) were categorized as deficient, severe deficiency was defined as a level of less than 10 ng/mL.
Being severely deficient in vitamin D was associated with a 79% greater risk of dying from any cause during follow-up in comparison with having higher levels of the vitamin. Deficiency of less than 6 ng/mL was associated with an even greater risk. Severe vitamin D deficiency was also associated with cirrhosis severity.
“The association between severe vitamin D deficiency and the risk of mortality suggests that serum 25-hydroxyvitamin D level can be used as a new marker to identify liver cirrhosis patients at high risk of mortality and that vitamin D supplementation may be helpful for reducing the risk of mortality,” Fuwei Yang and colleagues write.
“Our meta-analysis showed that severe vitamin D deficiency was associated with a higher risk of mortality in patients with liver cirrhosis,” they conclude. “Our results also support the recommendation for vitamin D supplementation in liver cirrhosis and highlight the urgent need for further randomized controlled trials to evaluate the impact of vitamin D supplementation on the prognosis of patients with liver cirrhosis.”
Nicotinamide riboside rejuvenates gut stem cells in aged mice
April 03 2019. An article appearing on March 27, 2019 in Aging Cell reports that treatment with nicotinamide riboside, a form of vitamin B3 that is a precursor of nicotinamide adenine dinucleotide (NAD+, a coenzyme occurring in all living cells), rejuvenated intestinal stem cells.
“The deterioration of organ integrity with aging can be in part attributed to a decline in adult stem cell number and function,” explain Masaki Igarashi and colleagues. “In certain cases, this decline could be attributed to a loss in the activity of one of the sirtuins, which are nicotinamide adenine dinucleotide (NAD+)‐dependent deacylases that regulate aging and age‐related diseases.”
Comparison of small intestines of young and old mice revealed a decrease in the number of intestinal stem cells in the older animals while cell differentiation was increased, which suggests that stem cell self-renewal is reduced during aging. By studying intestinal stem cells derived from both groups, it was observed that older mice had indications of decreased stem cell function. Treatment of intestinal cells derived from aged mice with nicotinamide riboside improved stem cell function while not affecting cells derived from young animals. Further research determined that the improvement is mediated by the SIRT1/mTORC1 signaling pathway.
When young and old mice were given drinking water with or without nicotinamide riboside for six weeks, the number of intestinal stem cells was restored in aged mice that received the compound. And in an experiment involving colon stem cells, nicotinamide riboside rescued damage repair defects in cells derived from old mice, possibly via restoration of stem cell numbers.
The authors describe other researchers’ findings involving NAD+ replenishment and remark that “Along with our findings in the gut, these results all suggest that NAD+ replenishment may be a viable strategy to slow aging in a variety of tissues.”
More omega-3, less omega-6 associated with reduced symptoms of childhood asthma
April 01 2019. An article published on March 29, 2019 in the American Journal of Respiratory and Critical Care Medicine reports an association between more omega-3 fatty acids in children’s diets and fewer symptoms of asthma caused by indoor air pollution. Conversely, consuming a greater amount of omega-6 was associated with more severe symptoms.
The study included 135 participants in the AsthmaDIET Study. Diet, asthma symptoms and inhaler use during the course of one week were reported by participants and caregivers upon enrollment and at three and six months. During these time points, blood samples were collected and week-long measurement of indoor fine and coarse airborne particulate matter was conducted in the participants’ homes. Asthma severity was assessed at the beginning of the study according to National Asthma Education and Prevention Program guidelines.
For each 0.1 gram increase in omega-3 fatty acids, there was a 3% to 4% reduction in the risk of experiencing daytime asthma symptoms in response to a 10 microgram per cubic meter increase in fine particle exposure. However, for each additional 1.0 gram of omega-6, there was a 2% rise in the risk of daytime symptoms associated with a 10 microgram per cubic meter increase in fine particle exposure and a 29% greater risk of experiencing more severe asthma. Greater omega-6 intake was also associated with an increase in white blood cells known as neutrophils.
"Many children in the U.S., including those in Baltimore City, where we conducted our research, consume a diet that deviates sharply from national guidelines, stated lead researcher Emily P. Brigham, MD. “Typically, this means they are eating low amounts of omega-3, and higher amounts of omega-6."
"Among vulnerable populations, we may find that improving diet and air pollution together has the greatest impact on asthma health," she concluded.