Posted by SLS on July 26, 2013, at 2:44:24
In reply to Is neurogenesis a myth?, posted by SLS on July 25, 2013, at 21:33:15
> In primates, neurogenesis in the cortex ends before birth. In the primate dentate gyrus of the hippocampus, there is some postnatal neurogenesis, but it rapidly drops toward zero in the first months of life.
One might consider that a single neuron can continue to sprout neurites and grow thicker. New connections are made all the time in the absence of neurogenesis. Neuritin, a signaling peptide, can prevent dendrite loss and promote neurite sprouting in the hippocampus. It is thought by some that neuritin has antidepressant properties.
Regarding the statement that recurrent affective episodes can double the risk of Alzheimers, that figure is charitable. I have seen some propose that the risk is tripled. I am not very happy about this. I am headed in that direction, I'm afraid.
- ScottSome see things as they are and ask why.
I dream of things that never were and ask why not.- George Bernard Shaw
poster:SLS
thread:1047807
URL: http://www.dr-bob.org/babble/20130706/msgs/1047811.html