Clinical prospects for stem cells start to emerge


Twenty years after the University of Wisconsin–Madison’s James Thomson derived the first human embryonic stem cell traces (ESC), his revolutionary discovery is just starting to emerge on the medical panorama. To date, a handful of medical trials of ESC-derived therapies have been accomplished, with roughly 16 extra now underway worldwide.

From a affected person’s perspective, 20 years might appear to be a frustratingly very long time for an essential discovery to get from bench to bedside. For physicians and researchers, nonetheless, the robust need to present hope to sufferers is balanced with realism concerning the path ahead. Responsible science is sort of all the time a gradual, grueling course of. But consultants within the discipline of stem cell and regenerative drugs really feel extra optimistic than ever, as a result of a essential mass of small successes.

Cardiologist Tim Kamp (left), a professor of drugs and director of the UW Stem Cell and Regenerative Medicine Center, hopes his preclinical work someday will result in remedies for sufferers who lose coronary heart muscle after a coronary heart assault. Image credit score: Jeff Miller

Perhaps no discipline of drugs has as a lot purpose to be hopeful about stem cell remedy as ophthalmology. Of the human trials underway, all however two contain therapies for eye problems. David Gamm, affiliate professor of ophthalmology and visible sciences on the UW School of Medicine and Public Health, attributes this to a few components: practicality, security and cost.

“Most new stem cell therapies require new surgical techniques and devices, but not always for the eye,” Gamm explains. “That reduces the cost of development and quickens the pace of getting new therapies through the FDA and into patients.”

But Gamm, who additionally directs UW–Madison’s McPherson Eye Research Institute, understands sufferers’ frustrations. He likens the method of growing stem cell therapies to the first makes an attempt at human flight.

“If the Wright brothers claimed they could build a plane that would fly across the Atlantic, they would have been laughed at,” Gamm says. “What they were really trying to do was glide off a hill safely, with the hope of greater things to come. And that’s where this field is right now.”Most of the advances within the discipline so far have concerned the event of human ESC-derived retinal pigment epithelium (RPE). The RPE is a single layer of cells that regulates the transport of vitamins and waste merchandise to and from the retina and is considered to be the a part of the attention the place macular degeneration begins. In 2012, 18 adults with extreme eye illness obtained transplants created from human embryonic stem cells and proceed to haven’t any obvious issues. Thirteen of these sufferers had an increase in pigmentation, suggesting that the transplanted cells have been nonetheless alive. The results of the examine, reported by researchers at Advanced Cell Technology in Massachusetts, offered the first proof of the medium- to long-term security and graft survival, and attainable organic exercise of pluripotent stem cells in people with any illness.

Gamm says the quite a few stem cell consultants at UW–Madison work collectively, usually throughout disparate disciplines — from cell biology to engineering to ethics.

“This is where Jamie Thomson and UW have led the way. We have a very strong sense of integrity and ethics here, and because we have this multidisciplinary approach to stem cells we also have a sense of realism,” Gamm says. “So, while we may not have flown that far yet, what we have done has allowed us to land safely. And that has allowed us to dust ourselves off, re-evaluate, climb back up that hill and try again.”

Gamm’s personal firm, Opsis Therapeutics, is presently working with Cellular Dynamics International, based by Thomson and now owned by Fujifilm, towards medical trials for retinitis pigmentosa, a gaggle of genetic ailments that result in blindness at an early age. Currently, there are not any remedies for these debilitating ailments.

Clinical trials for different ailments, including Parkinson’s, diabetes, spinal wire harm and coronary heart illness, will seemingly use induced pluripotent stem cells (iPSCs), grownup cells genetically reprogrammed to behave like embryonic stem cells.

Cardiologist Tim Kamp, a UW–Madison professor of drugs and director of the UW Stem Cell and Regenerative Medicine Center, shares Gamm’s cautious optimism.

“Stem cell biology is a dynamic landscape; things are constantly evolving,” Kamp says. “With every new legitimate effort, though, it’ll get easier for the rest of us to get approval from the FDA and our therapies into patients.”

Kamp cites Geron — the first firm to get a stem cell trial authorised by the FDA — for example of how every success helps speed up progress.

“Geron’s final FDA application was more than 20,000 pages,” Kamp explains. “It took them many years and millions of dollars, but that initial process educated the FDA and provided answers to some previously unanswered questions. And that was great news for the rest of us.”

Read more about the 20th anniversary of stem cell research at UW–Madison

Kamp is presently conducting preclinical work with colleagues from Duke University and the University of Alabama on a patch product of contracting coronary heart muscle derived from induced pluripotent stem cells. He and his collaborators hope someday these cells can be utilized to deal with sufferers who lose coronary heart muscle after a coronary heart assault. Another of Kamp’s collaborators, French researcher Philippe Menasché, not too long ago accomplished a section 1 trial that transplanted embryonic stem cell-derived cardiac progenitor cells into sufferers with extreme coronary heart failure. That remedy appears to be safe, nevertheless it’s too early to inform how efficient it was in re-muscularizing broken elements of the center.

Diabetes is one other cell-based illness within the crosshairs of UW School of Medicine and Public Health researchers. Earlier this year, results of the first human trial of a stem cell-derived beta cell alternative remedy have been revealed. Professor of Surgery Jon Odorico, who organized the convention at which the results of the trial have been introduced, says whereas the findings weren’t a home run, the trial helped blaze an essential path by the FDA. Conducted by the corporate Viacyte, the trial was the first involving stem cells and a macroencapsulation system designed to guard the transplanted cells from a affected person’s immune system. A second trial is underway in the identical affected person inhabitants (grownup sufferers with sort 1 diabetes and hypoglycemia unawareness) and a handful of others are deliberate, including one by Odorico’s personal firm Regenerative Medical Solutions. He hopes to have a product in medical trials inside the subsequent few years.

“There is now a critical mass of experts involved in this field and things are moving a lot faster, with more money and more industry involvement,” Odorico says. “Wisconsin has played a leading role in getting the field to this point and we are poised to take an even more prominent role, both nationally and internationally.”

As for Gamm and his sufferers, the dialog has begun to shift from one in every of resignation to 1 that enables for guarded optimism. He remembers a time when there wasn’t a lot he could provide sufferers, and whereas there are nonetheless no authorised and confirmed stem cell therapies in the marketplace, his message within the clinic has modified dramatically:

“It’s great to be able to tell my patients that they are not forgotten,” Gamm says. “I can finally tell them that the hope is real.”

Source: University of Wisconsin-Madison




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