A new study raises the intriguing possibility that drugs prescribed to lower cholesterol may be effective against macular degeneration, a blinding eye disease.
Researchers at Washington University School of Medicine in St. Louis have found that age-related macular degeneration, the leading cause of vision loss in Americans over 50, shares a common link with atherosclerosis. Both problems have the same underlying defect: the inability to remove a buildup of fat and cholesterol.
The new study is published online in the journal Cell Metabolism.
When the eyes of patients with macular degeneration are examined, small light dots appear against the orange background beneath the retina. The dots are cholesterol deposits, and as cholesterol builds up, the area becomes inflamed. Inflammation spurs the development of abnormal blood vessels that can lead to loss of vision.
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Patients who have atherosclerosis often are prescribed medications to lower cholesterol and keep arteries clear. This study, which worked with both mice and human cells, suggests that some of those same drugs could help patients with macular degeneration.
“Based on our findings, we need to investigate whether vision loss caused by macular degeneration could be prevented with cholesterol-lowering eye drops or other medications that might prevent the buildup of lipids beneath the retina,” says senior investigator Rajendra S. Apte, MD, PhD.
The new research centers on macrophages, key immune cells that remove cholesterol and fats from tissues. In macular degeneration, the excessive buildup of cholesterol begins to occur as we age, and our macrophages begin to malfunction.
In the “dry” form of age-related macular degeneration, doctors examining the eye can see lipid deposits beneath the retina. As those deposits become larger and more numerous, they slowly begin to destroy the central part of the eye, interfering with the vision needed to read a book or drive a car.
As microphages age, they clear fewer fat deposits beneath the retina. They also become bloated with cholesterol, creating an inflammatory process that leads to the formation of new blood vessels that can cause further damage. Those vessels are characteristic of the later “wet” form of the disease.
“Most of the vision loss from ‘wet’ macular degeneration is the result of bleeding and scar-tissue formation related to abnormal vessel growth,” Apte explains.
As part of their research, the scientists identified a protein that macrophages need to clear fats and cholesterol. As mice and humans age, they make less of the protein, and macrophages become less effective at engulfing and removing fat and cholesterol.
Apte and his team found that macrophages, from old mice and in patients with macular degeneration, have inadequate levels of the protein, called ABCA1, which transports cholesterol out of cells. As a result, the old macrophages accumulated high levels of cholesterol and couldn’t slow the growth of the damaging blood vessels that characterize the “wet” form of the disorder.
But when the researchers treated the macrophages with a substance that helped restore levels of ABCA1, the cells could remove cholesterol more effectively, and the development of new blood vessels was slowed.
“We were able to deliver the drug, called an LXR agonist, in eye drops,” says first author Abdoulaye Sene, PhD, a post-doctoral fellow in the Apte lab. “And we found that we could reverse the macular degeneration in the eye of an old mouse. That’s exciting because if we could use eye drops to deliver drugs that fight macular degeneration, we could focus therapy only on the eyes, and we likely could limit the side effects of drugs taken orally.”
Sene and Apte also say that since macrophages are important in atherosclerosis and in the formation of new blood vessels around certain types of cancerous tumors, the same pathway also might provide a target for more effective therapies for those diseases.
“We have shown that we can reverse the disease cascade in mice by improving macrophage function, either with eye drops or with systemic treatments,” Apte says.
“Some of the therapies already being used to treat atherosclerosis target this same pathway, so we may be able to modify drugs that already are available and use them to deliver treatment to the eye.”
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