Photoreceptor transplant may help restore vision in eye disorders

   Apr 19, 11:21 am

Washington, Apr 19 (ANI): Transplanting photoreceptors - light-sensitive nerve cells that line the back of the eye - could form the basis of a new treatment to restore sight in people suffering from degenerative eye diseases, a new study has suggested.

Scientists funded by the Medical Research Council (MRC) have shown for the first time that transplanting light-sensitive photoreceptors into the eyes of visually impaired mice can restore their vision.

Researchers from UCL Institute of Ophthalmology injected cells from young healthy mice directly into the retinas of adult mice that lacked functional rod-photoreceptors.

Loss of photoreceptors is the cause of blindness in many human eye diseases including age-related macular degeneration, retinitis pigmentosa and diabetes-related blindness.

There are two types of photoreceptor in the eye - rods and cones. The cells transplanted were immature (or progenitor) rod-photoreceptor cells. Rod cells are especially important for seeing in the dark as they are extremely sensitive to even low levels of light.

After four to six weeks, the transplanted cells appeared to be functioning almost as well as normal rod-photoreceptor cells and had formed the connections needed to transmit visual information to the brain.

The researchers also tested the vision of the treated mice in a dimly lit maze. Those mice with newly transplanted rod cells were able to use a visual cue to quickly find a hidden platform in the maze whereas untreated mice were able to find the hidden platform only by chance after extensive exploration of the maze.

"We've shown for the first time that transplanted photoreceptor cells can integrate successfully with the existing retinal circuitry and truly improve vision. We're hopeful that we will soon be able to replicate this success with photoreceptors derived from embryonic stem cells and eventually to develop human trials," Professor Robin Ali at UCL Institute of Ophthalmology, who led the research, said.

"Although there are many more steps before this approach will be available to patients, it could lead to treatments for thousands of people who have lost their sight through degenerative eye disorders. The findings also pave the way for techniques to repair the central nervous system as they demonstrate the brain's amazing ability to connect with newly transplanted neurons."

Dr Rachael Pearson from UCL Institute of Ophthalmology and principal author said that they are now searching for ways to improve the efficiency of cone photoreceptor transplantation and to increase the effectiveness of transplantation in very degenerate retina.

"We will probably need to do both in order to develop effective treatments for patients."

"This is a landmark study that will inform future research across a wide range of fields including vision research, neuroscience and regenerative medicine," Dr Rob Buckle, head of regenerative medicine at the MRC said.

"It provides clear evidence of functional recovery in the damaged eye through cell transplantation, providing great encouragement for the development of stem cell therapies to address the many debilitating eye conditions that affect millions worldwide," Dr Buckle added.

The researchers demonstrated previously that it is possible to transplant photoreceptor cells into an adult mouse retina, provided the cells from the donor mouse are at a specific stage of development - when the retina is almost, but not fully, formed.

In this study they optimised the rod transplantation procedure to increase the number of cells integrated into the recipient mice and so were able to restore vision .

The study has been published in Nature. (ANI)

New 'game-changing' clot-removal tack better than drugs alone for stroke patients Apr 18, 11:39 am
Washington, Apr 18 (ANI): A new study has found that removal of the clot causing a severe stroke plus standard medication yields better long term outcomes in stroke patients than drug alone.
Full Story
Molecular mechanism that makes malaria parasites drug-resistant identified Apr 18, 11:14 am
Washington, Apr 18 (ANI): A team of researchers has made key malarial drug-resistance finding.
Full Story
Men compete over being 'most helpful' to women online Apr 17, 11:39 am
Washington, April 17 (ANI): Ladies! If you need any help online, men would be at your service, for a new study shows that males tend to compete with each other when it comes to being generous to women online.
Full Story
'Wishful thinking' can't take away negative realities of Facebook for users Apr 17, 10:35 am
Washington, Apr 17 (ANI): A new study has suggested that Facebook users with so-called optimistic bias think that they're less likely than other users to experience cyberbullying, depression and other negative social and psychological effects from using the site.
Full Story
Comments

LATEST STORIES
TOP VIDEO STORIES
PHOTO GALLERY