DAVID GRANOVSKY

CATCH UP!! – Stem Cells MAY?? Offer New Way to Treat Blocked Arteries – Forbes.com

In ALL ARTICLES, STEM CELLS IN THE NEWS on May 20, 2009 at 6:21 pm

Once again, US research and especially the US media (Forbes) is years behind the rest of the world on stem cell progress!

The headline in Forbes reads, “Stem Cells May Offer New Way to Treat Blocked Arteries.”  Here is where the rest of the world stands on cardiac and arterial treatment with stem cells.

1998 – Dr Doris Taylor takes stem cells from the thigh of a rabbit, injects them into scar tissue in the animal’s heart and repairs the damaged muscle.  The research was published in Nature Medicine.

1998-1999 – French researchers transplanted muscle cells into a human heart.

2000 – Human studies and trials using adult stem cells to regrow muscle tissue, including cardiac muscle tissue, are performed in many countries around the world.

2002 – Dr Taylor herself witnessed in Rotterdam the first patient in the world to get stem cells injected through a catheter into the wall of the heart. Encouraging results began to come in—improved ejection fractions, reduced diameters, thicker muscle tissue.

2004 – The first-ever commercial stem cell treatment center in the world was regrowing human cardiac muscle tissue in hundreds of patients in Thailand!  Stem cells are recognized as “smart,” going to where they were needed most, creating micro-vessel bypasses around blockages that were existing, those that were removed previously and in areas where stents were implanted.

2005 – Dr Taylor  rinsed rat hearts with detergent until the cells washed away and all that remained was a skeleton of tissue translucent as wax paper. She then injected the scaffold with fresh heart (stem) cells from newborn rats.  Four days later, “We could see these little areas that were beginning to beat.  By eight days, we could see the whole heart beating.”  The experiment, reported in the journal Nature Medicine, marked the first time scientists had created a functioning heart in the lab from biological tissue.

2009 – Present day.  There are currently dozens of stem cell treatment centers around the world who are using adult stem cells to treat cardiac disease in human patients and regrow both cardiac and skeletal muscle tissue and more.

CATCH UPCATCH UP!!

Stem Cells May Offer New Way to Treat Blocked Arteries – 05.19.09, 04:00 PM EDT

Injections into heart restore blood flow in small study

TUESDAY, May 19 (HealthDay News) — Injecting bone marrow cells into the heart’s muscular wall restored blood flow to hearts with blocked arteries for which conventional treatments had proven ineffective, Dutch physicians have reported.

“I think this is very good news for patients who are at the end of the line and have no options left,” said Dr. Douwe E. Atsma, an interventional cardiologist at Leiden University Medical Center and an author of the study, which appears in the May 20 issue of the Journal of the American Medical Association.

The 50 people in the study, 43 of them men, were experiencing angina, or severe chest pain, because of blockages in their heart arteries. All had undergone several artery-opening procedures, such as angioplasty or bypass surgery, to restore blood flow, but such measures would no longer help them, Atsma said.

Half of the participants received injections of cells taken from their own bone marrow, and the others received inactive cell injections. After three months, the responses were varied, with some participants reporting complete relief and others with partial benefits.

“The most important thing is that the amount of ischemia [artery blockage] was halved” in those given the marrow cells, Atsma said. “The amount of tissue with ischemia was reduced, heart function improved significantly in a small way and their grades of quality of life were higher.”

Two earlier and smaller trials of bone marrow cell therapy for heart disease had produced conflicting results, Atsma said. “We are the largest trial to date and the first to demonstrate a decrease in ischemia,” he said.

The results were so good, Atsma said, that the participants who had gotten the dummy injections have since been given bone marrow cell therapy, and “we now consider it an option for patients in the same condition,” he said.

The study excluded people with heart failure, which occurs when the heart muscle has become too weak to pump blood properly. But Atsma said that a trial of bone marrow cell therapy for people who have blocked arteries as well as heart failure is planned.

The bone marrow cell injections help restore blood flow by promoting the creation of new blood vessels, Atsma said, but it’s not clear how this happens. “It could be that the cells that are injected become part of the vasculature, the blood vessels,” he said. “Even better, the injected cells may secrete proteins that stimulate angiogenesis, formation of blood vessels. Or it might be a combination of those two things.”

Whatever the reason for the benefit of bone marrow cell therapy, “we are fairly enthusiastic, considering that these patients had no alternative,” Atsma said. “They had all the surgery and angioplasty they could have.”

Dr. Amit Patel, director of cardiovascular regenerative medicine at the University of Utah, described the finding as “definitely a step forward in the treatment of chronic angina.” But he had some cautionary comments.

It was a small study, with just 50 participants, he said, adding that “to make it a more reproducible therapy, you would have to do at least a couple of hundred patients.”

Also, the follow-up period was relatively short, at three months, he noted. “Something positive happened, but you would have to follow these patients further to see how long it would last,” Patel said. Future studies to determine whether there would be an overall improvement in heart function would also be welcome, he said.

Doris Taylor, director of the University of Minnesota Center for Cardiovascular Repair, also had qualified praise for the results.

“The good news is that it is more mechanistic in that it gives some insights into perfusion,” she said. “It reinforces the evidence that bone marrow cells are safe and effective. It also reinforces the prevailing wisdom that it is not a home run. The results are positive, but it is not the panacea we hoped it would be.”

To further the baseball analogy, Taylor said that “for the people who feel better, I would consider it a double.”

More studies are needed to learn about the value of cell therapy “across the complete spectrum of cardiovascular disease,” she said. “We need to understand what we need to do differently. I hope these data provoke that conversation.”

via Stem Cells May Offer New Way to Treat Blocked Arteries – Forbes.com.

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