Couldn't find what you looking for?

TRY OUR SEARCH!

Table of Contents

Who would have thought that atherosclerosis and blindness could be sharing a common link? But that is exactly what scientists have found. Not only that, eye drops used for lowering cholesterol may soon be used to treat age related macular degeneration.

In a study which can have far reaching consequences, scientists from the Washington University School of Medicine in St. Louis have found that drugs commonly employed to lower the levels of cholesterol can be effectively used to treat macular degeneration, an age related blindness. The research has been published in the journal Cell Metabolism and was led by Rajendra S. Apte, a Paul A. Cibis Distinguished Professor of Ophthalmology and Visual Sciences, along with his colleagues.

eye-drops.jpg

Macular degeneration is one of the commonest causes of blindness in American people beyond the age of 50. Studies done in the past have shown that both atherosclerosis and macular degeneration are a result of the same disease process. In both the conditions, the underlying pathology is the inability of the body to clear fat and cholesterol deposition. Researchers associated with the present study, tried to find out whether medicines used for treating atherosclerosis would be beneficial in treatment of macular degeneration as well.

They observed that as we age, our macrophages, which are the most important immune cells involved in the removal of cholesterol and fats from the tissues, begin to malfunction.

The two types of macular degeneration

Macular degeneration is basically of two types- the dry form and the wet form. In the dry form of macular degeneration, there is a collection of lipids beneath the retina in the eye. As the deposits increase in size, they start interfering with the vision. The result is gradual loss of vision, particularly in the central part of the eye. In a normal individual, the lipid collection is cleared by the macrophages. But in elderly people, where the macrophages are not working to their optimal capacity, the lipids are not cleared completely. On the contrary, the macrophages meant to remove them get filled with cholesterol and become sluggish. Their collection gives rise to an inflammatory process which, in turn, leads to the formation of new blood vessels. This neo-vascularization is characteristic of the wet form of macular degeneration and results in further impairment of vision. This is because the development of these abnormal new blood vessels is associated with bleeding and formation of scar tissue.

As a part of their study, the researchers analyzed the macrophages in humans and mice. They noticed that the macrophages need a protein, called as ABCA1, to clear cholesterol and fats. With the aging process, the level of this protein becomes insufficient in the macrophages. Therefore, the efficiency of macrophages in clearing cholesterol decreases. With low levels of ABCA1, the macrophages are no longer able to transport cholesterol outside the cells. This leads to an accumulation of cholesterol inside the macrophages.

Continue reading after recommendations

  • “Impaired Cholesterol Efflux in Senescent Macrophages Promotes Age-Related Macular Degeneration,” by Rajendra S. Apte, et al
  • published in the April 2, 2013 issue of the journal Cell Metabolism, accessed on May 28, 2013
  • “Cholesterol Buildup Links Atherosclerosis and Macular Degeneration,” published on April 2, 2013 at sciencedaily.com, accessed on May 28, 2013
  • “Age-related macular degeneration is associated with atherosclerosis-The Rotterdam Study,” by Vingerling JR, et al, published in the August 15, 1995 issue of the American Journal of Epidemiology, accessed on May 28, 2013.
  • Photo courtesy of Community Eye Health by Flickr : www.flickr.com/photos/communityeyehealth/5445396658/
  • Photo courtesy of Community Eye Health by Flickr : www.flickr.com/photos/communityeyehealth/8489872984/

Your thoughts on this

User avatar Guest
Captcha