Researchers at the University of California, San Diego School of Medicine say neutrophils, an abundant type of white blood cell typically tasked with attacking bacteria and other foreign invaders, also plays an unexpected role in mediating insulin resistance — the central characteristic of type 2 diabetes, which afflicts an estimated 26 million Americans.
Neutrophils are the first immune cells to respond to tissue inflammation, and can promote chronic inflammation by summoning other white blood cells called macrophages. Chronic low-grade inflammation — common in adipose or fat tissue — is an important cause of systemic insulin resistance.
Using liver and fat cells from mice and humans and live mouse models, a team led by Jerrold M. Olefsky, MD, associate dean for scientific affairs at UC San Diego Health Sciences and professor of medicine, discovered that an enzyme secreted by neutrophils called neutrophil elastase (NE) impairs insulin signaling and boosts resistance. Conversely, deletion of NE in obese mice fed a high-fat diet improved insulin sensitivity.
“These results are largely unexpected,” said Da Young Oh, an assistant project scientist in Olefsky’s lab and study co-author. “Although several immune cells have been established in the etiology of insulin resistance, the role of neutrophils in this process has remained unclear until now.”
Oh said neutrophils were considered to be “transient infiltrates,” temporary cells (average lifespan: 5 days) that were incapable of sustaining chronic, low-grade inflammation. “Our studies now suggest neutrophils possess powerful immune modulatory effects,” Oh said.
Specifically, neutrophils use NE to activate a signaling pathway which triggers pathogen-eating macrophages to secrete pro-inflammatory molecules called cytokines. NE degrades IRS1, a key protein in the insulin signaling pathway in both liver and fat cells. Although NE has been shown to degrade this protein in lung cancer cells, the scientists said, the effect on insulin target tissues such as liver and adipose is striking.
The insulin-mediating role of neutrophils makes them a new target for developing treatments of insulin resistance in particular and diabetes in general. “Given that NE mediates insulin resistance, one could, in theory, take an NE activity inhibitory approach to reverse or improve insulin resistance,” Oh said, noting that NE inhibitors are already used for treatment of emphysema in Japan and are being tested in the United States, both for emphysema and type 1 diabetes.
Health-e-Solutions comment: If the diet you eat is clean enough, it may have a positive effect on the circulating white blood cells, due to the fact that there is less for them to “clean up.” This may also be due a diet and lifestyle that is less inflammatory. That is one of our goals with the Health-e-Solutions lifestyle. We try to concentrate on foods that are anti-inflammatory and avoid those that are known to cause inflammation. Inflammation is thought to be a major contributing factor to the development of diabetes.
Our Recipe e-Books provide alternatives to the typical high-carb, low nutrition foods that are standard fare for the average western diet. Our Home Study Course teaches you how to implement the Health-e-Solutions lifestyle in a practical and livable way. We think it can form the foundation for a natural, way to better manage all types of diabetes.