Navigation Links
High insulin levels tied to obesity pathway, new UT Southwestern research shows

UT Southwestern Medical Center researchers have identified a crucial link between high levels of insulin and pathways that lead to obesity, a finding that may have important implications when treating diabetes.

Researchers with the UT Southwestern's Touchstone Center for Diabetes found that giving mice high levels of insulin, which is typically done to counter the effects of diabetes or insulin resistance in Type 2 diabetes, also fosters processes that lead to obesity.

The discovery was made by studying mice engineered to lack receptors for a hormone called glucagon.

Glucagon spurs the liver's production of glucose into the bloodstream and thus maintains the fuel supply for the brain. Insulin blocks the secretion of glucagon, opposes glucagon action on the liver, and instructs the body to take up glucose from the blood. Type 2 diabetics cannot respond properly to insulin and have uncontrolled glucagon production, thereby causing their livers to overproduce glucose, contributing to high blood-sugar levels. Insulin is often given to people with type 2 diabetes to try to overcome insulin-resistance and lower the levels of glucose in the bloodstream.

But insulin also signals the body to produce fat, so when given the high levels of insulin needed to control excess glucose, mice become fat, explained corresponding author Dr. Michael Roth, Professor of Biochemistry at UT Southwestern and a member of the Touchstone Diabetes Center.

"We found that mice lacking the receptor for glucagon cannot get fat unless they are given the high levels of insulin found in mice (and humans) that have type 2 diabetes," said Dr. Roth, who holds the Diane and Hal Brierley Distinguished Chair in Biomedical Research. "This result suggests that the high levels of insulin found in those who develop insulin resistance and type 2 diabetes are a contributor to obesity and its complications."

Dr. Roth cautioned that if this response also happens in humans, then treating patients with type 2 diabetes with higher than normal amounts of insulin could contribute to the development of obesity.

The findings suggest that physicians may need to reconsider use of intensive insulin therapy to control hyperglycemia (high blood-sugar levels) in obese, diabetic patients with hyperinsulinemia (overproduction of insulin). In addition, the findings suggest that suppressing glucagon action could prevent hyperinsulinemia, without causing diabetes. The research team found that suppressing glucagon in obese, insulin-resistant, type 2 diabetic mice reduced blood glucose back to normal levels.

Glucagon and insulin normally counteract each other as part of an ongoing effort to stabilize blood-sugar levels. The glucagon hormone is produced and released by the pancreas in response to low concentrations of insulin and, conversely, glucagon release is suppressed by high levels of insulin in the bloodstream. The balance between the two hormones is disrupted in type 2 diabetics by the insulin that is given to control high glucose levels. This excess insulin, in turn, causes the body to produce excess fat. The new findings lead the authors to suggest that the high insulin levels actually aggravate diabetes. The optimal therapy, they propose, should be diet restriction and reducing glucagon levels.

According to estimates of the World Health Organization (WHO), 347 million people worldwide have diabetes, 90 percent of whom are affected by type 2 diabetes. Although previously only seen in adults, type 2 diabetes is now occurring in children, and can include complications such as an increased risk of heart disease and stroke, nerve damage, and eye disease.


Contact: Russell Rian
UT Southwestern Medical Center

Related medicine news :

1. Do closed-loop insulin delivery systems improve blood glucose control in type 1 diabetes?
2. Human Insulin Market by Product Types and Brand Worth $42 Billion by 2019 - New Report by MarketsandMarkets
3. Sensitive acid sensor controls insulin production
4. University of Florida Startup Launches Million-dollar Indiegogo Campaign to Eliminate Painful Needle Injections for Insulin
5. A new way to generate insulin-producing cells in Type 1 diabetes
6. Human Insulin Market Worth $42 Billion by 2019 - New Report by MarketsandMarkets
7. Bionic pancreas outperforms insulin pump in adults, youth
8. Late-breaking observational data show patients with type 2 diabetes taking JANUVIA® (sitagliptin) and metformin initiated insulin therapy at a slower rate compared to patients taking a sulfonylurea and metformin
9. New post-hoc analysis shows patients with type 2 diabetes undergoing intensification of insulin therapy experienced less nighttime hypoglycemia while being treated with Januvia (Sitagliptin) compared to placebo
10. Insulin-producing beta cells from stem cells
11. Tips To Improve Insulin Sensitivity and Avoid Storing Carbohydrates as Fat Released by Health News Wires
Post Your Comments:
Related Image:
High insulin levels tied to obesity pathway, new UT Southwestern research shows
(Date:10/13/2015)... ... , ... Sir Grout of Greater Boston donated an expansive, seven room ... House Charities® (RMHC®). This donation was made in an effort to give back to ... inception. , “We believe strongly in the Ronald McDonald House Charities, and they are ...
(Date:10/13/2015)... (PRWEB) , ... October 13, 2015 , ... ... its newest technology platform, ENGAGE, at HIMSS’s Patient Engagement Summit . HealthAware ... , ENGAGE delivers innovative health programs and interventions via mobile devices that provide ...
(Date:10/13/2015)... ... October 13, 2015 , ... Element ... products, introduced a new company, RightSensor™ LLC, an Internet of Things (IoT) hardware ... RightSensor™ provides a fully-managed approach for customers requiring sensor hardware for critical data ...
(Date:10/13/2015)... ... , ... NavaFit Inc. today announced the launch of its NavaFit app for ... local fitness & sporting events, and stay motivated. Users can download the ... us to get more serious about fitness and wellness, individuals are constantly looking for ...
(Date:10/13/2015)... , ... October 13, 2015 ... ... Omega-3, a first-of-its kind product that targets the unique health needs of ... of the American Pregnancy Association ( ), utilizes Nordic Naturals’ exclusive, ...
Breaking Medicine News(10 mins):
(Date:10/13/2015)... , Oct. 13, 2015  A minimally-invasive treatment just ... the United States.  After more than 10 years of ... 9 approved the use of High Intensity Focused Ultrasound ... cells while protecting surrounding tissue and minimizing chances for ... George Suarez , a pioneering Miami ...
(Date:10/13/2015)... N.J. , Oct. 13, 2015  ContraVir ... the "Company"), a biopharmaceutical company focused on the ... announced the closing of its previously announced underwritten ... stock and warrants to purchase up to 3,000,000 ... fixed combined price to the public of $3.00. ...
(Date:10/13/2015)... , Oct. 13, 2015  Measurement in accountable ... and balancing financial incentives, but gaps in measurement ... care and health systems. A new, peer-reviewed ... Managed Care explores measurement gaps for ... sets. --> --> ...
Breaking Medicine Technology: