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T2DM

Misfolded proinsulin is early sign of type 2 diabetes

The discovery could lead to tests or treatments that help prevent people from developing type 2 diabetes

According to a study by scientists at Sanford Burnham Prebys and the University of Michigan Medical School, misfolded proinsulin - a protein the body normally processes into insulin - is an early sign of type 2 diabetes. The discovery could lead to tests or treatments that help prevent people from developing type 2 diabetes.

"Understanding the molecular events that occur as prediabetes progresses to diabetes opens new avenues for us to detect or interrupt these processes," said Dr Randal Kaufman, director and professor in the Degenerative Diseases Program at Sanford Burnham Prebys and co-corresponding author of the study. "With this information, we can start to find interventions that might spare millions of people from a serious, lifelong condition."

Identifying the molecular events that occur during progression from prediabetes to full-blown diabetes remains one of the most perplexing problems in diabetes research. In the study, ‘Proinsulin misfolding is an early event in the progression to type 2 diabetes’, published in eLife, researchers set out to answer this question by tracking proinsulin folding in the beta cells of humans and mice that are healthy, prediabetic and diabetic.

These studies revealed that instead of undergoing its normal folding process, proinsulin proteins were abnormally linked to each other. Levels of the abnormal proinsulin accumulated as prediabetes progressed to type 2 diabetes. Obese mice in the earliest stages of diabetes had the highest levels of abnormal proinsulin in their beta cells.

"Proinsulin misfolding is the earliest known event that may contribute to the progression from prediabetes to diabetes," added Kaufman. "Together, these studies show that abnormally linked proinsulin holds promise as a potential measure of how close someone may be to developing type 2 diabetes."

The researchers are set to uncover more details about this process, such as the proteins that interact with the misfolded proinsulin.

"Understanding the fundamental molecular events that lead to type 2 diabetes is critical as the number of people with prediabetes continues to rise," concluded Kaufman. "If we don't find preventive measures, we will soon have a diabetes epidemic."

To access this paper, please click here

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