Bariatric surgery appears to reverse premature aging
Surgery and premature aging
Two years after surgery, patients had telomeres that were 80% longer than they had been before the procedure
Weight loss from bariatric surgery appears to reverse the premature aging associated with obesity, according to research presented at Frontiers in CardioVascular Biology (FCVB) 2016. In his presentation, ‘Reversal of premature aging markers after bariatric surgery’, Dr Philipp Hohensinner, a researcher at the Medical University of Vienna in Vienna, Austria, said that surgical patients had longer telomeres and less inflammation two years after surgery.
He explained that telomeres are the internal clock of each cell and they get shorter when a cell divides or when oxidative stress causes them to break. When the telomeres get very short the cell can no longer divide and is replenished or stays in the body as an aged cell. Previous research found that obese women had shorter telomeres compared to women with a healthy weight, which amounted to an added eight years of life.
Philipp Hohensinner
“Obese people are prematurely old,” said Hohensinner. “They have an increased level of inflammation, with higher levels of inflammatory cytokines (small proteins important in cell signalling) in their fat tissue. Obese people also have shorter telomeres at the end of their chromosomes.”
This study investigated whether bariatric surgery and the resulting weight loss could reverse the premature aging in obese patients, and included 76 patients who were 40 years old on average and had a BMI>35 (average BMI44.5). All patients had been unable to lose weight through lifestyle changes and were referred for bariatric surgery.
The researchers collected blood samples before surgery and one and two years afterwards. They compared the levels of premature aging markers in the blood before and after surgery. One year after surgery BMI had significantly dropped to an average of 27.5 (a 38% reduction). This was accompanied by decreases in the pro-inflammatory cytokines plasminogen activator inhibitor-1 and interleukin-6, and an increase in the anti-inflammatory cytokine interleukin-10.
Two years after surgery, patients had telomeres that were 80% longer than they had been before the procedure.
“The loss of a large amount of fat seems to shift the body’s system from a pro-inflammatory state towards a more healthy one,” said Hohensinner. “Telomere length had increased two years after surgery in immune cells in the blood. These cells are replenished over time. It means that the cells we examined at two years were different cells in this new post-surgery environment. They had longer telomeres and appeared younger than the cells we measured before surgery. The cells seem to have less stress and are less forced to proliferate.”
The researchers also evaluated telomere oxidation, which causes the telomeres to break and get shorter. They found that two years after surgery, oxidative damage on the telomeres had reduced by three-fold.
“We think the cells appear to be getting younger, with longer telomeres, because there is less breakage from telomere oxidation. Obesity, and specifically having a lot of fat tissue, seems to put the entire body under increased stress. By losing weight and therefore adipose tissue, that stress reduces, and the body becomes younger,” he concluded. “This is positive news for patients who have bariatric surgery because it shows that the damage from obesity can be reversed. Surgery is the last resort for these patients and it is good to see that not only do they lose weight, but they also reduce the stress on their body and reduce the premature aging.”