AgBioResearcher Identifies Cell Mechanism Leading to Diabetic Blindness

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Susanne Mohr (view larger image)

Scientists have long known that high blood sugar levels from diabetes damage blood vessels in the eye, but they didn’t know why or how. Now an MAES scientist has discovered the process that causes retinal cells to die, and that discovery could lead to new treatments that halt the damage.

Diabetic retinopathy is a common side effect of diabetes and the leading cause of blindness in young adults in the United States.

Innovative research by Susanne Mohr, MAES physiology researcher, found the siah-1 protein is produced by the body when blood sugar levels are high. She then discovered that the siah-1 protein serves as a type of chauffeur for another protein, glyceraldehyde-3-phosphate dehydrogenase (GAPDH), shuttling the GAPDH into the nucleus of Müller cells, special cells that have contact with the blood vessels in the eye. When GAPDH accumulates in their nuclei, the Müller cells die. Their death leads to the vascular damage associated with diabetic retinopathy.

The research was published in the Jan. 29 issue of the Journal of Biological Chemistry.

“Our earlier research showed that high glucose levels cause GAPDH to accumulate in the nuclei of Müller cells in the retina,” Mohr explained. “But we weren’t sure how the GAPDH was getting in there. It doesn’t contain any of the necessary signaling motifs. I read about the siah-1 protein and cell death in white blood cells in a Nature paper, so we decided to investigate them. We had no idea if the siah-1 protein was even in the retina.”

Mohr’s research also found that lowering levels of siah-1 proteins stopped GAPDH from moving into the nuclei of Müller cells and stopped them from dying.

“This is very exciting,” Mohr said. “We know that we can’t regulate production of GAPDH because it’s necessary for producing energy throughout the body. But since siah-1 is produced only when glucose levels are high, regulating it doesn’t cause any problems. If we can figure out how to stop siah-1 production, it may lead to new treatments for diabetic retinopathy.”

Mohr explained that stopping GAPDH from moving into Müller cell nuclei is important to halting the progress of diabetic retinopathy. Even after glucose levels are lowered and stabilized in diabetics, GAPDH continues to accumulate in Müller cell nuclei. So the retinal damage keeps worsening, just more slowly. Between 40 and 45 percent of people diagnosed with diabetes have some degree of diabetic retinopathy.

“If we can keep GAPDH out of the nuclei, we may be able to completely stop diabetic retinopathy,” Mohr said. “Our next step is to figure out if both the GAPHD and the siah-1 proteins have to be together in a complex to cause cell death.”

E. Chepchumba Yego, doctoral student at Case Western Reserve University, is co-author of the paper. Mohr began the research at Case Western and then continued the project when she joined MSU in August 2009.

The research is funded by the National Institutes of Health and supported by the Michigan Agricultural Experiment Station.

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