Japanese hospital conducts world's 1st iPS transplant of visual cells


A Japanese hospital said Thursday it has performed the world's first clinical trial of a transplant of visual cells derived from induced pluripotent stem cells, or iPS cells, to treat a patient with pigmentary retinal degeneration.

Kobe City Eye Hospital in the western Japan prefecture of Hyogo conducted the clinical trial on a patient with the disease, which can cause vision problems, including trouble seeing at night, due to a progressive loss of photoreceptor cells in the retina.

There are some 30,000 sufferers of the genetic disorder in Japan, and there is no known treatment.

Depending on how far the disease has progressed, a patient's vision may not improve significantly. Still, the research team aims to verify its safety on humans after it completed testing of the iPS cells on animals.

As gene mutations are believed to be the cause of pigmentary retinal degeneration, the team utilized iPS cells grown from the blood cells of a healthy donor rather than those of the patient.

The cells were cultured into three-dimensional retinal tissue using various substances, which was then made into a sheet containing photoreceptor cells and transplanted into the patient's retina.

The patient will be observed for a year to see that the body does not reject the transplanted cells. The research team will also investigate whether the new cells will communicate "sight" with existing cells in the body and transmit information to the brain.

The team plans to perform a clinical trial of the procedure on a second patient.

The iPS cells, developed by Kyoto University's Shinya Yamanaka, who won the 2012 Nobel Prize in physiology or medicine for the achievement, can grow into any type of body tissue.

The world's first clinical test using iPS cells was conducted in 2014 by government-backed research institute Riken, transplanting retina cells into an individual with a different eye disease.


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Amazing !!.. Well done Japan !!.

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Very amazing. There's great medical advances happening. My own sister with type 1 diabetes just got a pancreas/liver transplant recently. This couldn't have happened 20 years ago.

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Good work.

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Hopefully, in the future, we will be able to modify the patient's own iPS cells to fix the genetic flaw before installation. Having to use exogenous cells adds a whole other layer of complication and variability to this procedure and a lifetime of anti-rejection drugs and compromised immune response. With that said, WOW! Potentially growing new retina is an amazing place to be in our knowledge compared to just fifty years ago. Too bad our collective perception of ourselves has not kept the last 5000 years it hasn't changed a whit and we still mass murder ourselves every generation as we have done for a very long time. The contrast between the knowledge we have gained and our overall collective behavior is sad beyond Human toleration...but we do. My best wishes to those who must suffer these first, hesitant steps because of this malady and may color and light and the faces of your loved ones become yours again...ganbatte

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