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Nano-devices that cross blood-brain barrier open door to treatment of cerebral palsy
Date:4/23/2012

kins Wilmer Eye Institute.

Animals treated with dendrimer-borne NAC showed marked improvement in motor control and coordination within five days after birth, nearly reaching the motor skill of healthy rabbits. By comparison, rabbits treated with dendrimer-free NAC showed minimal, if any, improvement, even at doses 10 times higher than the dendrimer-borne version. Animals treated with the dendrimer-delivered drug also showed better muscle tone and less stiffness in the hind leg muscles, both hallmarks of CP.

Brain tissue analysis revealed that rabbits treated with dendrimer-borne NAC had notably fewer "bad" microglia the inflammatory cells responsible for brain damage as well as markedly lower levels of other inflammation markers. They also had better preserved myelin, the protein that sheaths nerves and is stripped or damaged in CP and other neurologic disorders. And even though CP is marked by neuron death in certain brain centers, animals who received dendrimer-borne NAC had higher number of neurons in the brain regions responsible for coordination and motor control, compared with untreated animals and those treated with NAC only.

The findings suggest that the treatment not only reduces inflammation in the cells, but may also prevent cell damage and cell death, the researchers said. The Kannans, who are married, say they plan to follow some treated animals into adulthood to ensure the improvements are not temporary.

A separate study, led by Rangaramanujam Kannan, has already demonstrated the therapeutic benefits of this approach in reversing retinal damage in rats with macular degeneration, the vision-robbing eye disorder that affects millions of older adults.


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Contact: Ekaterina Pesheva
epeshev1@jhmi.edu
410-502-9433
Johns Hopkins Medical Institutions
Source:Eurekalert

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