{"id":17237,"date":"2024-01-08T07:30:37","date_gmt":"2024-01-08T06:30:37","guid":{"rendered":"https:\/\/thesmartcityjournal.cibeles.net\/sin-categoria\/researchers-explore-changes-to-microbiome-following-weight-loss-surgery\/"},"modified":"2024-12-03T20:56:41","modified_gmt":"2024-12-03T19:56:41","slug":"researchers-explore-changes-to-microbiome-following-weight-loss-surgery","status":"publish","type":"post","link":"https:\/\/www.thesmartcityjournal.com\/en\/biotechnology\/researchers-explore-changes-to-microbiome-following-weight-loss-surgery","title":{"rendered":"Researchers explore changes to microbiome following weight-loss surgery"},"content":{"rendered":"

Study suggests that microbiome-based therapies such as probiotics and fecal matter transplants have the potential to improve metabolic health<\/p>\n

Researchers at the University of Toronto and its partner hospitals are finding that changes in gut microbiota after bariatric surgery can directly improve metabolism, independent of food intake, weight loss and other metabolic factors.<\/p>\n

Their ongoing work \u2013 including a study published last year in the journal Cell Reports Medicine<\/em><\/a> focused on patients who underwent the surgery \u2013 suggests that microbiome-based therapies such as probiotics and fecal matter transplants have the potential to improve metabolic health. <\/p>\n

They may also one day reduce the need for weight-loss surgery itself.<\/p>\n

\u201cWe know the microbiome contributes to metabolic improvements after bariatric surgery, but have known very little about how,\u201d said Johane Allard, a clinician-scientist at University Health Network and a professor at U of T\u2019s Temerty Faculty of Medicine. \u201cWe\u2019ve recently shown that with no other changes, the altered microbiome influences that outcome, and we identify potential mechanisms.\u201d<\/p>\n

Bariatric surgery is a cornerstone of treatment for severe obesity. It changes the size and structure of the digestive system, limiting the amount patients can eat and absorption of nutrients. But it also comes with short- and long-term health risks, and in Canada often costs the health-care system more than $20,000 per procedure.<\/p>\n

The surgery also releases gut hormones that improve insulin sensitivity and reduce appetite, and it alters the makeup and function of gut microbiota \u2013 changes that have surprised and perplexed clinicians, as the annual number of procedures worldwide has surged past half a million.<\/p>\n

Researchers have sought to understand how \u2013 and how much \u2013 these additional biochemical changes contribute to metabolic improvements and weight loss, with an eye to new treatments. But studies of microbiota-related changes that could be harnessed as broadly effective therapies have been stymied by vast differences in gut microbiota among individuals.<\/p>\n

The recent pre-clinical study gets around that problem through paired fecal matter transplants. The Toronto team transferred fecal matter from four people to mice \u2013 both before and after the human participants had bariatric surgery. The team fed both groups of mice the same high-fat, western diet in a germ-free facility, then observed the effects over several weeks.<\/p>\n

Mice receiving the post-surgery transplant showed much better blood-sugar control and insulin sensitivity than the pre-surgery recipients, suggesting a strong role for the microbiome in improved metabolism, despite no change in body weight. The human study participants also became more sensitive to insulin and lost weight, as expected.<\/p>\n

Less expected, however, was an increase in mass and energy expenditure in brown fat among mice that received the post-surgery transplant.<\/p>\n

\u201cWe were very surprised by the data in brown adipose tissue,\u201d said Dana Philpott, a co-principal investigator in the study and professor of immunology at Temerty Medicine. \u201cWe thought if we looked at regular [white fat] adipose tissue, we might see decreased fat or an ability to metabolize better, but the finding was very specific to brown fat.\u201d<\/p>\n

Heat was an early clue that something of interest was happening in brown fat, which plays a role in regulating body temperature.<\/p>\n

\u201cWhen we first put the post-surgery transplant mice in the metabolic cages, we noticed they generated more heat,\u201d said Jitender Yadav, a postdoctoral researcher in the Philpott lab and a co-first author on the study. \u201cWe also noticed in some of the literature that bariatric surgery in mice increases brown adipose tissue and energy expenditure, and in our study, we were able to see the similar effect just by transferring the post-surgery microbiome.\u201d<\/p>\n

As well, the team found biochemical and transcriptional markers of reduced inflammation in the white fat of post-surgery mice \u2013 another sign of improved metabolic health. To look for microbiota-related changes that could explain all these metabolic improvements, the researchers studied and compared metabolites in stool samples from pre- and post-surgery mice.<\/p>\n

They found increases in tryptophan metabolites, short-chain fatty acids and acylcarnitines, and decreases in amino acids, organic acid and lactic acid \u2013 all correlated with improved metabolic health. Those changes in metabolites were consistent across the post-surgery mice, despite variations in the constituents of their microbiota and in the microbiota of the four patients.<\/p>\n

\u201cThe bacterial makeup of the microbiota wasn\u2019t significant,\u201d Yadav said. \u201cWe now think that microbiome-based therapies that induce the right mix of metabolites, such as pre- and probiotics, dietary changes and fecal matter transplants, could be an effective therapy for improved metabolism and weight loss.\u201d<\/p>\n

Co-principal investigator Herbert Gaisano, a clinician-scientist at Toronto General Hospital Research Institute and a professor in Temerty Medicine\u2019s department of medicine, recently received funding to study how these metabolites work. Gaisano and his team, including co-first authors on the current study Tao Liang and Tairan Qin, will analyze the metabolites in human tissue samples of fat and liver, obtained during bariatric surgery.<\/p>\n

The Philpott lab also continues to study the metabolites in the offspring of the study mice, and they hope to replicate their results with a larger number of patients at some point.<\/p>\n

More broadly, Yadav said the study should help nudge the field of microbiome research away from a long-standing focus on bacteria. \u201cOne takeaway is that the amount and type of bacteria don\u2019t always matter,\u201d he said. \u201cIt\u2019s the metabolites they produce, and which get absorbed downstream, that can influence health.\u201d<\/p>\n

Several other researchers participated in the study. They include Allan Okrainec and Tim Jackson, both of the University Health Network and Temerty Medicine\u2019s department of surgery, and Daniel Winer, Susy Hota, Susan Poutanen and Hoon-Ki Sung, as well as their lab groups.<\/p>\n

The research was supported by the Canadian Institutes of Health Research and U of T\u2019s Banting and Best Diabetes Centre.<\/p>\n

From left to right: Researchers Susan Poutanen, Nayanan Nathan, Wendy Lou, Jitender Yadav, Dana Philpott, Johane Allard, Katherine Schwenger, Minna Woo, Tairan Qin and Tao Liang<\/em><\/p>\n

Source: Jim Orfield (<\/em>https:\/\/www.utoronto.ca\/news\/researchers-explore-changes-microbiome-following-weight-loss-surgery<\/a>)<\/em><\/p>\n","protected":false},"excerpt":{"rendered":"

Study suggests that microbiome-based therapies such as probiotics and fecal matter transplants have the potential to improve metabolic health Researchers at the University of Toronto and its partner hospitals are finding that changes in gut microbiota after bariatric surgery can directly improve metabolism, independent of food intake, weight loss and other metabolic factors. 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