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Therapeutic Cells Derived From Reprogrammed (iPS) Stem Cells Display Early Aging
Date:2/10/2010

WORCESTER, Mass., Feb. 11 /PRNewswire-FirstCall/ -- Advanced Cell Technology, Inc. (OTCBB: ACTC) reported that a range of therapeutic cell types obtained from induced pluripotent stem (iPS) cells exhibit abnormal expansion and early cellular aging.  The research, which appears online (published-ahead-of- print) in the journal STEM CELLS by ACT and its collaborators at Stem International (SCRMI), Harvard Medical School, and the University of Illinois, compares a variety of replacement cell types derived from human iPS cells to their embryonic stem (ES) cell counterparts. 

The research shows that human iPS cells can generate blood, vascular and retinal cells with characteristics similar to those derived from ES cells, but with a dramatic decreased efficiency.  However, in distinct contrast to the ES cell derivatives, major differences were observed in cells derived from iPS cells, including significantly increased cell death (apoptosis), severely limited growth and expansion capability, as well as a substantially decreased capacity to generate blood progenitors.  After further differentiation into red blood cells, over a thousand-fold difference in expansion capability was observed in iPS cells versus ES cell progenitors.  Although vascular cells derived from iPS cells were capable of forming capillary-like structures, the cells also demonstrated early cell aging (senescence). Similarly, retinal cells derived from iPS cells also displayed early signs of aging.  

"Before clinical application, it will be necessary to determine the cause and extent of such abnormalities, and whether they also occur in stem cells generated using different reprogramming methods" said Robert Lanza, M.D., Chief Scientific Officer at ACT, and senior author of t
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SOURCE Advanced Cell Technology, Inc.
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