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Melatonin pre-treatment is a factor that impacts stem cell survival after transplantation
Date:7/22/2013

Putnam Valley, NY. -- When melatonin, a hormone secreted by the pineal gland, was used as a pre-treatment for mesenchymal stem cells (MSCs) prior to their transplantation into the brains of laboratory animals to repair damage from stroke, researchers in China found that the stem cells survived longer after transplantation. Previous studies had shown that 80 percent of transplanted MSCs died within 72 hours of transplantation. By contrast, the melatonin pre-treatment "greatly increased" cell survival, said the researchers.

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/ct0998tang

The pineal gland is a small endocrine gland located in the center of the brain, but outside of the bloodbrain barrier. The melatonin it secretes acts as a signal and forms part of the system that regulates the sleepwake cycle by chemically causing drowsiness and lowering body temperature. Melatonin is also known to be a powerful antioxidant and has been used clinically to treat sleep disorders.

In this study, the researchers used a melatonin pre-treatment on MSCs they harvested from the laboratory animals that had been chemically modeled with ischemic brain injury (stroke). Previous studies had shown that MSCs "express" melatonin receptors M1 and M2.

"Mesenchymal cells can be harvested from self-donors (autologous) without ethical concerns," said study co-author Dr. Guo-Yuan Yang of the Neuroscience and Neuroengineering Research Center at the Shanghai Jiao Tong University in Shanghai, China. "Studies have shown that MSCs differentiate into various cells and can, upon transplantation, improve functional recovery after ischemic brain injury. In this study we used laboratory rats chemically modeled with stroke and tried to determine if pretre
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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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