International Entrepreneurship and Management Journal

ISSN: 1757-1938 SJR : 0.847 SNIP : 1.89948

Gut bacteria may guard against diabetes that comes with aging Old mice lose one type of friendly microbe, triggering a hallmark of the disease

BY TINA HESMAN SAEY 10:55AM, NOVEMBER 19, 2018

Old mice have less Akkermansia muciniphila bacteria than young mice do, researchers report November 14 in Science Translational Medicine. That loss triggers inflammation, which eventually leads cells to ignore signals from the hormone insulin. Such disregard for insulin’s message to take in glucose is known as insulin resistance and is a hallmark of type 2 diabetes.

Researchers have suspected that bacteria and other microbes in the gut are involved in aging, but how the microbes influence the process hasn’t been clear. Monica Bodogai of the U.S. National Institute on Aging in Baltimore and colleagues examined what happens to mice’s gut bacteria as the rodents age. The mice lose A. muciniphila, also called Akk, and other friendly microbes that help break down dietary fiber into short-chain fatty acids, such as butyrate and acetate. Those fatty acids signal bacteria and human cells to perform certain functions.

Losing Akk led to less butyrate production, Bodogai’s team found. In turn, loss of butyrate triggered a chain reaction of immune cell dysfunction that ended with mice’s cells ignoring the insulin.

Treating old mice and elderly rhesus macaques with an antibiotic called enrofloxacin increased the abundance of Akk in the animals’ guts and made cells respond to insulin again. Giving old animals butyrate had the same effect, suggesting that there may be multiple ways to head off insulin resistance in older people in the future.Citations

M. Bodogai et alCommensal bacteria contribute to insulin resistance in aging by activating innate B1a cellsScience Translational Medicine. Published online November 14, 2018. doi:10.1126/scitranslmed.aat4271.Further Reading

T.H. Saey. Obesity’s weight gain message starts in gutScience News. Vol. 190, July 9, 2016, p. 7.

S. Zielinski. Microbes may help bears stay healthy when fat for hibernation. Science News Online, February 4, 2016.

L. Beil. Typical American diet can damage immune systemScience News. Vol. 187, May 30, 2015, p. 18.