The level of diversity of the ‘good bacteria’ in our digestive systems has been found to be linked to a feature of cardiovascular disease – hardening of the arteries – in new research by experts at the University of Nottingham and King’s College London.
The gut microbiome is under increasing scrutiny in medical research as it is known to affect many different aspects of our health, including our metabolism and auto-immune system. A lack of diversity or range of healthy bacteria in the gut has previously been linked to various health problems, including diabetes, obesity and inflammatory stomach and bowel diseases.
Now for the first time, researchers have found a link between gut bacteria and arterial stiffening which suggests that targeting the microbiome through diet, medication and probiotics may be a way to reduce the risk of cardiovascular disease. The British Heart Foundation and MRC-funded research has been published in the European Heart Journal1.
The gut microbiome has been implicated in a variety of potential disease mechanisms including inflammation which can predispose people to heart disease. The hardening of the arteries that happens at different rates in different people as we age, is known to be a factor in cardiovascular risk.
The researchers examined medical data from a group of 617 middle-aged female twins from the TwinsUK registry – a national registry of adult twins recruited as volunteers for data-based research. Measurements of arterial stiffening using a gold-standard measure called carotid-femoral pulse-wave velocity (PWV) were analysed alongside data on the composition of the gut microbiomes of the women.
The results of the analysis revealed that there was a significant correlation in all the women between the diversity of the microbes in the gut and the health of the arteries. After adjusting for metabolic variations and blood pressure, the measure of arterial stiffness was higher in women with lower diversity of healthy bacteria in the gut. The research also identified specific microbes which were linked to a lower risk of arterial stiffening. These microbes have also previously been associated with a lower risk of obesity.
Dr Ana Valdes, from the University of Nottingham’s School of Medicine and NIHR Nottingham Biomedical Research Centre, said: “We know that a substantial proportion of serious cardiovascular events like heart attacks are not explained by traditional risk factors such as obesity and smoking, particularly in younger people and in women and that arterial stiffness is related to risk in those groups. So our results reveal the first observation in humans linking the gut microbes and their products to lower arterial stiffness. It is possible that the gut bacteria can be used to detect risk of heart disease and may be altered by diet or drugs to reduce the risk.”
Dr Cristina Menni, from the Department of Twin Research and Genetic Epidemiology at King’s College London, said: “There is considerable interest in finding ways to increase the diversity of gut microbes for other conditions such as obesity and diabetes. Our findings now suggest that finding dietary interventions to improve the healthy bacteria in the gut could also be used to reduce the risk of heart disease.”
The research concludes that cardiovascular risk that is not explained by the usual risk factors could in the future be enhanced by analysing the health of the gut microbiome. This could be particularly useful in stratifying cardiovascular risk in younger people and in women. The gut microbiome could also be the target for nutrition-based health interventions – for example, a high-fibre diet is known to improve the quantity and diversity of useful microbes in the gut. In fact, the composition of the gut microbiome may contribute to the mechanism whereby dietary fibre intake influences cardiovascular risk, but more research into this mechanism is needed.
The research was funded by the British Heart Foundation and Medical Research Council and is part of a programme grant, AIM-HY, to identify markers that may help taylor treatments to individuals (www.aimhy.org.uk).
1 “Gut microbial diversity is associated with lower arterial stiffness in women”, by Cristina Menni et al. European Heart Journal. doi:10.1093/eurheartj/ehy226
Notes to editors:
The University of Nottingham is a research-intensive university with a proud heritage, consistently ranked among the world’s top 100. Studying at the University of Nottingham is a life-changing experience and we pride ourselves on unlocking the potential of our 44,000 students – Nottingham was named University of the Year for Graduate Employment in the 2017 Times and Sunday Times Good University Guide, was awarded gold in the TEF 2017 and features in the top 20 of all three major UK rankings. We have a pioneering spirit, expressed in the vision of our founder Sir Jesse Boot, which has seen us lead the way in establishing campuses in China and Malaysia – part of a globally connected network of education, research and industrial engagement. We are ranked eighth for research power in the UK according to REF 2014. We have six beacons of research excellence helping to transform lives and change the world; we are also a major employer and industry partner – locally and globally.
More information is available from Dr Ana Valdes, School of Medicine, Faculty of Medicine and Health Sciences on +44 (0)115 823 1954 or email [email protected]