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 Rat-grown mouse pancreases help reverse diabetes in mice

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PostSubject: Rat-grown mouse pancreases help reverse diabetes in mice    Thu Jan 26, 2017 12:16 am

Rat-grown mouse pancreases help reverse diabetes in mice, say researchers at Stanford, University of Tokyo

Mouse pancreases grown in rats generate functional, insulin-producing cells that can reverse diabetes when transplanted into mice with the disease, according to researchers at the Stanford University School of Medicine and the Institute of Medical Science at the University of Tokyo.

The recipient animals required only days of immunosuppressive therapy to prevent rejection of the genetically matched rather than lifelong treatment.

The success of the interspecies transplantation suggests that a similar technique could one day be used to generate matched, transplantable human organs in large animals like pigs or sheep.

To conduct the work, the researchers implanted mouse pluripotent stem cells, which can become any cell in the body, into early rat embryos. The rats had been genetically engineered to be unable to develop their own pancreas and were thus forced to rely on the mouse cells for the development of the organ.

Once the rats were born and grown, the researchers transplanted the insulin-producing cells, which cluster together in groups called islets, from the rat-grown pancreases into mice genetically matched to the stem cells that formed the pancreas. These mice had been given a drug to cause them to develop diabetes.

"We found that the diabetic mice were able to normalize their blood glucose levels for over a year after the transplantation of as few as 100 of these islets," said Hiromitsu Nakauchi, MD, PhD, a professor of genetics at Stanford. "Furthermore, the recipient animals only needed treatment with immunosuppressive drugs for five days after transplantation, rather than the ongoing immunosuppression that would be needed for unmatched organs."

Nakauchi, who is a member of Stanford's Institute for Stem Cell Biology and Regenerative Medicine, is the senior author of a paper describing the findings, which will be published online Jan. 25 in Nature. Tomoyuki Yamaguchi, PhD, an associate professor of stem cell therapy, and researcher Hideyuki Sato, both from the University of Tokyo, share lead authorship of the paper.

https://www.eurekalert.org/pub_releases/2017-01/sumc-rmp012517.php
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