Researchers have identified a major mechanism by which obesity causes type 2 diabetes, which is a common complication of being overweight. In obesity, insulin released into the blood by the pancreas is unable to pass through the cells that form the inner lining of blood vessels.
As a result, insulin is not delivered to the muscles, where it usually stimulates most of the body's glucose to be metabolized. Blood glucose levels rise, leading to diabetes and its related cardiovascular, kidney and vision problems.
A major problem in obesity is the delivery of circulating insulin to the muscle, this problem involves immunoglobulins, which are the proteins that make up circulating antibodies. The researchers found that obese mice have an unexpected chemical change in their immunoglobulins.
The abnormal immunoglobulins then act on cells lining blood vessels to inhibit an enzyme needed to transfer insulin from the bloodstream into the muscle. Type 2 diabetes patients have the same chemical change, and if immunoglobulins from a type 2 diabetic individual is given to a mouse, the mouse will becomes diabetic.
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