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MIT study suggests caution on new anti-obesity drug in kids
Date:5/7/2008

Anti-obesity drugs that work by blocking brain molecules similar to those in marijuana could also interfere with neural development in young children, according to a new study from MITs Picower Institute for Learning and Memory.

Marijuana is known to be an appetite stimulant, and a new class of anti-obesity drugssuch as rimonabant (trade name Acomplia) developed by Sanofi-Aventis and awaiting approval for use in the United Stateswork by blocking brain receptors that bind to marijuana and other cannabinoids.

Marijuana, derived from the plant Cannabis sativa, contains special active compounds that are referred to collectively as cannabinoids. But other cannabinoids (endocannabinoids) are generated naturally inside the body.

The MIT study, which was done in mice, found that blocking cannabinoid receptors could also suppress the adaptive rewiring of the brain necessary for neural development in children. The work is reported in the May 8 issue of Neuron.

Our finding of a profound disruption of cortical plasticity in juvenile mice suggests caution is advised in the use of such compounds in children, wrote lead author Mark F. Bear, director of the Picower Institute and Picower Professor of Neuroscience.

The researchers investigated plasticitythe brains ability to change in response to experienceby temporarily depriving newborn mice of vision in one eye soon after birth. This well-known experiment induces a long-lasting loss of synapses that causes blindness in the covered eye, while synapses shift to the uncovered eye. How and where this synaptic shift occurs in the primary visual cortex has remained controversial.

Understanding the mechanism behind this phenomenon is key because the same brain mechanisms are used for normal development and may go awry in conditions that cause developmental delays in humans, and may reappear in old age and contribute to synaptic loss during Alzheimer's disease, Bear said.


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Contact: Teresa Herbert
therbert@mit.edu
617-258-5403
Massachusetts Institute of Technology
Source:Eurekalert

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