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Impact of stem cell transplantation location in brain a crucial factor for cell survival
Date:2/13/2013

Putnam Valley, NY. (Feb. 13, 2013) Researchers at the Johns Hopkins University in Baltimore, Md., and the Mossakowski Medical Research Centre in Warsaw, Poland, have found that nonself-donated cells (allografts) better survive implantation into the brains of immunocompetent research mice when the grafts are injected into the striatum (STR) of the brain rather than injected into the forceps minor (FM) region. In their study, all FM grafts were rejected while STR grafts accumulated and survived along the border between the striatum and the corpus callosum.

"To the best of our knowledge, this is the first demonstration that allograft survival within the central nervous system of an immunocompetent, non-immune suppressed host may be highly dependent on implantation site," said study co-author Dr. Pior Walczak of the Johns Hopkins University School of Medicine.

The study appears as an early e-publication for the journal Cell Transplantation, and is now freely available on-line at http://www.ingentaconnect.com/content/cog/ct/pre-prints/ct0888janowski.

The researchers, who assessed the grafted cells using bioluminescence for 16 days, reported that the distribution of the FM grafts was cylindrical, parallel to the needle track, while cells transplanted to the STR accumulated along the border between the striatum and the corpus callosum in a wedge-shaped, semi lunar "pocket." They suggested that the shape of the cell deposit in the FM was likely due to damage caused by the injection procedure.

"This is an indicator that surgical injury may be the leading factor initiating the rejection process," the researchers said. "Thus, minimally traumatic allograft transplantation, preventing activation of the microglia and limiting foreign antigen presentation, may contribute to long-term allograft survival."

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Contact: Robert Miranda
cogcomm@aol.com
Cell Transplantation Center of Excellence for Aging and Brain Repair
Source:Eurekalert

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