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Stem cell findings may offer answers for some bladder defects and disease
Date:3/21/2014

ls. Their procedure was efficient and, most importantly, the cells proliferated over a long period of time a critical element in any tissue engineering application.

"What's exciting about this discovery is that it also opens up an array of opportunities using pluripotent cells," said Jan Nolta, professor and director of the UC Davis Stem Cell program and a co-author on the new study. "When we can reliably direct and differentiate pluripotent stem cells, we have more options to develop new and effective regenerative medicine therapies. The protocols we used to create bladder tissue also provide insight into other types of tissue regeneration."

UC Davis researchers first used human embryonic stem cells obtained from the National Institutes of Health's repository of human stem cells. Embryonic stem cells can become any cell type in the body (i.e., they are pluripotent), and the team successfully coaxed these embryonic stem cells into bladder cells. They then used the same protocol to coax iPS cells made from skin and umbilical cord blood into bladder cells, called urothelium, that line the inside of the bladder. The cells expressed a very unique protein and marker of bladder cells called uroplakin, which makes the bladder impermeable to toxins in the urine.

The UC Davis researchers adjusted the culture system in which the stem cells were developing to encourage the cells to proliferate, differentiate and express the bladder protein without depending upon signals from other human cells, said Kurzrock. In future research, Kurzrock and his colleagues plan to modify the laboratory cultures so that they will not need animal and human products, which will allow use of the cells in patients.

Kurzrock's primary focus as a physician is with children suffering from spina bifida and other pediatric congenital disorders. Currently, when he surgically reconstructs a child's defective bladder, he must use a segment of their own intestine. Bec
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Contact: Charles Casey
charles.casey@ucdmc.ucdavis.edu
916-734-9048
University of California - Davis Health System
Source:Eurekalert

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