WASHINGTON U.-ST. LOUIS (US) — People may one day be able to take a naturally produced compound much like a daily vitamin to treat or even prevent Type 2 diabetes, according to new research.
Using nicotinamide mononucleotide, or NMN—a compound the body makes naturally—researchers have restored normal blood sugar metabolism in diabetic mice. NMN plays a vital role in how cells use energy.
“After giving NMN, glucose tolerance goes completely back to normal in female diabetic mice,” says Shin-ichiro Imai, associate professor of developmental biology at Washington University in St. Louis. “In males, we see a milder effect compared to females, but we still see an effect. These are really remarkable results. NMN improves diabetic symptoms, at least in mice.”
The research, reported online in Cell Metabolism, holds promise for people because the mechanisms that NMN influences are largely the same in mice and humans.
“But whether this mechanism is equally compromised in human patients with type 2 diabetes is something we have to check,” Imai says. “We have plans to do this in the very near future.”
All cells in the body make NMN in a chain of reactions leading to production of NAD, a vital molecule that harvests energy from nutrients and puts it into a form cells can use. Among other things, NAD activates a protein called SIRT1 that has been shown to promote healthy metabolism throughout the body, from the pancreas to the liver to muscle and fat tissue.
Aging and eating a high-fat diet reduce production of NMN, slowing the body’s production of NAD and leading to abnormal metabolic conditions such as diabetes.
NAD can’t be given to the mice directly because of toxic effects, but after administering NMN, levels of NAD rise and the diabetic mice show dramatically improved responses to glucose. In some cases, they return to normal.
“I’m very excited to see these results because the effect of NMN is much bigger than other known compounds or chemicals,” says postdoctoral research associate and first author Jun Yoshino. “Plus, the fact that the body naturally makes NMN is promising for translating these findings into humans.”
Young, healthy mice on a high-fat diet developed diabetes in six months or less—and NAD levels were reduced. But after administering NMN, levels of NAD increased and the female mice had normal results in glucose tolerance tests—a measure of how well the body moves glucose from the blood to the organs and tissues for use.
Glucose tolerance was also improved after male diabetic mice received NMN but did not quite return to normal.
The researchers are interested in learning more about these differences between male and female mice.
“We don’t have a clear answer, but we are speculating that sex hormones, such as estrogen, may be important downstream for NAD synthesis,” Yoshino says.
In older mice, they observed that about 15 percent of healthy males fed a normal diet developed diabetes. “When we injected these older diabetic mice with NMN, they had improved glucose tolerance, even after one injection,” says Kathryn F. Mills, research lab supervisor and an equally contributing first author of the study.
“We also injected older healthy mice and found that they weren’t adversely affected. It’s good to know that even if the mice are not diabetic, giving NMN is not going to hurt them.”
Few studies have examined normal mice that naturally develop diabetes as a simple result of aging because the experiments take so long. In an interesting twist, few elderly female mice developed diabetes at all. But after switching to a high fat diet, older female mice quickly developed severe diabetes.
“Again, when we injected these females with NMN, we came up with a completely normal glucose tolerance curve,” Mills says. “We can also see that the NMN has completely reversed and normalized the levels of cholesterol, triglycerides, and free fatty acids.”
Though the mice received NMN by injection in the study, Imai’s group is now conducting a long-term study of diabetic mice that get NMN dissolved in their drinking water—a first step toward a possible “nutriceutical” that people could take almost like a vitamin to treat or even prevent type 2 diabetes, Imai says.
“Once we can get a grade of NMN that humans can take, we would really like to launch a pilot human study.”
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