anhinga_anhinga: (Default)
[personal profile] anhinga_anhinga
Prof. Michael Gershon, the Chairman of the Dept. of Anatomy and Cell Biology of Columbia University says that our gut can think for itself.

From http://www.hosppract.com/issues/1999/07/gershon.htm:

"Once dismissed as a simple collection of relay ganglia, the enteric nervous system is now recognized as a complex, integrative brain in its own right. Although we still are unable to relate complex behaviors such as gut motility and secretion to the activity of individual neurons, work in that area is proceeding briskly--and will lead to rapid advances in the management of functional bowel disease.

Structurally and neurochemically, the enteric nervous system (ENS) is a brain unto itself. Within those yards of tubing lies a complex web of microcircuitry driven by more neurotransmitters and neuromodulators than can be found anywhere else in the peripheral nervous system. These allow the ENS to perform many of its tasks in the absence of central nervous system (CNS) control--a unique endowment that has permitted enteric neurobiologists to investigate nerve cell ontogeny and chemical mediation of reflex behavior in a laboratory setting. Recognition of the importance of this work as a basis for developing effective therapies for functional bowel disease, coupled with the recent, unexpected discovery of major enteric defects following the knockout of murine genes not previously known to affect the gut, has produced a groundswell of interest that has attracted some of the best investigators to the field. Add to this that the ENS provides the closest thing we have to a window on the brain, and one begins to understand why the bowel--the second brain--is finally receiving the attention it deserves.[...]"

:-) :-) :-) So all kinds of cool things can be given proper explanations, from our "gut feelings" and Bush' "I am a gut player", to the default location of Castaneda's "assemblage point" :-) :-) :-) Eat well!

Date: 2005-08-29 02:15 am (UTC)
spamsink: (Default)
From: [personal profile] spamsink
From the article, it seems that the gut "brain" is an application-specific processing unit. I wouldn't call it a brain.

Date: 2005-08-29 02:44 am (UTC)
From: [identity profile] dr-nicodimus.livejournal.com
My 2 cents: there are AMPA in Meisner and Auerbach plexi, but no NMDA and mGluR's. Probably no KA as well, and enteric toxicity of kainate/domoate/etc is due to their lack of selectivity in toxic concentrations.

Date: 2005-08-29 03:03 pm (UTC)
From: [identity profile] anhinga-anhinga.livejournal.com
I wonder what is known about synaptic plasticity (changes in the number of AMPA per synapse) there...

Date: 2005-08-30 12:00 am (UTC)
From: [identity profile] dr-nicodimus.livejournal.com
Also the subunit composition of AMPA, their Ca++ permeability, splice forms, desensitization patterns, glycosilation, palmitoylation, phosphorylation, anchoring to the cytoskeleton... :-)

Patch-clump and checking whether Argio and Joro spider toxins have any effects on intestinal preparations contractility would be a good starter. The effects of the
agonists in vivo are quite obvious (diarrhetic shellfish poisoning).

Date: 2005-08-30 03:42 am (UTC)
From: [identity profile] anhinga-anhinga.livejournal.com
:-) The real thing I want to know is whether a subjective experience is associated with that neural system, and if yes, what kind...

But we are not equipped to investigate questions like this, so one can use speculative imagination instead... with some interesting results in this case :-)

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