Research sheds light on gut bacteria's role in diabetes

USA: Researchers at Cedars-Sinai have identified two groups of taxa, one type of bacteria found in the gut may protect from the disease. At the same time, another may contribute to the development of type 2 diabetes. The findings of the study appeared in the peer-reviewed journal Diabetes.

The study found people with higher levels of a bacterium called Coprococcus tended to have higher insulin sensitivity. In comparison, those whose microbiomes had higher levels of the bacterium Flavonifractor tended to have lower insulin sensitivity.

The genus Coprococcus was linked with higher insulin sensitivity (β = 0.14) and disposition index (β = 0.12) and a lower dysglycemia rate (odds ratio [OR] 0.91). In contrast, Flavonifractor was linked with lower insulin sensitivity (β = −0.13) and disposition index (β = −0.11) and a higher prevalence of dysglycemia

For years, investigators have sought to understand why people develop diabetes by studying the microbiome's composition, a collection of microorganisms that include fungi, bacteria and viruses in the digestive tract. The microbiome is thought to be affected by medications and diet. Studies have also found that people who don’t process insulin properly have lower levels of a certain type of bacteria that produces a type of fatty acid called butyrate.

Mark Goodarzi, MD, PhD, the director of the Endocrine Genetics Laboratory at Cedars-Sinai, is leading an ongoing study that is following and observing people at risk for diabetes to learn whether those with lower levels of these bacteria develop the disease.

“The big question we're hoping to address is: Did the microbiome differences cause diabetes, or did diabetes cause the microbiome differences?” said Goodarzi, who is the senior author of the study and principal investigator of the multicenter study called Microbiome and Insulin Longitudinal Evaluation Study (MILES).

Investigators involved in MILES have collected information from participating Black and non-Hispanic white adults between 40 and 80 years of age since 2018. An earlier cohort study from the MILES trial found that birth by cesarean section is associated with a higher risk for developing prediabetes and diabetes.

For the most recent study to come out of this ongoing trial, investigators analyzed data from 352 people without known diabetes who were recruited from the Wake Forest Baptist Health System in Winston-Salem, North Carolina.

Study participants were asked to attend three clinic visits and collect stool samples before the visits. Investigators analyzed data collected at the first visit. They conducted genetic sequencing on the stool samples, for example, to study the participants’ microbiomes and specifically look for bacteria that earlier studies have found to be associated with insulin resistance. Each participant also filled out a diet questionnaire and took an oral glucose tolerance test, which was used to determine the ability to process glucose.

Investigators found 28 people had oral glucose tolerance results that met the criteria for diabetes. They also found that 135 people had prediabetes, a condition in which a person’s blood sugar levels are higher than normal but not high enough to meet the definition of diabetes.

The research team analyzed associations between 36 butyrate-producing bacteria found in the stool samples and a person’s ability to maintain normal insulin levels. They controlled for factors that could also contribute to a person’s diabetes risk, such as age, sex, body mass index and race. Coprococcus and related bacteria formed a network of bacteria with beneficial effects on insulin sensitivity. Despite being a producer of butyrate, Flavonifractor was associated with insulin resistance; prior work by others has found higher levels of Flavonifractor in the stool of people with diabetes.

Investigators continue to study samples from patients who participated in this study to learn how insulin production and the microbiome composition change over time. They also plan to study how diet may affect the bacterial balance of the microbiome.

Goodarzi emphasized that it is too early to know how people can change their microbiome to reduce their diabetes risk.

“As far as the idea of taking probiotics, that would really be somewhat experimental,” said Goodarzi, the Eris M. Field Chair in Diabetes Research at Cedars-Sinai. “We need more research to identify the specific bacteria we need to modulate to prevent or treat diabetes, but it's coming, probably in the next five to 10 years.”

Reference:

Jinrui Cui, Gautam Ramesh, Martin Wu, Elizabeth T. Jensen, Osa Crago, Alain G. Bertoni, Chunxu Gao, Kristi L. Hoffman, Patricia A. Sheridan, Kari E. Wong, Alexis C. Wood, Yii-Der I. Chen, Jerome I. Rotter, Joseph F. Petrosino, Stephen S. Rich, Mark O. Goodarzi; Butyrate-Producing Bacteria and Insulin Homeostasis: The Microbiome and Insulin Longitudinal Evaluation Study (MILES). Diabetes 1 November 2022; 71 (11): 2438–2446. https://doi.org/10.2337/db22-0168