Cannabinoids are potent neuroprotective agents
John at overhere.com.au
Fri Aug 15 19:28:16 EST 2003
One angle that occurred to me last night might interest you. Cannabinates
(!) have been shown to inhibit proliferation of breast and prostate cancer
cells, and in one experiment last year very aggressively killed off a glioma
without damaging nearby tissue. Cannabinates also downregulate proliferation
of immune cells in the lymph nodes.
Cannabinates downregulate il1, il1 has been shown to potentiate or perhaps
even be necessary for the maturation of neural and ogc progenitor cells. I'm
just wondering if cannabinates may also impact on neurogenesis in the
dentate gyrus, thereby, slowly but surely, impacting on hippocampal size and
function, though I imagine this would be a long term consequence.
The lipid raft idea is interesting, I vaguely recall something about CD40
and il12 potentiation of the same leading to increased immunological
activity in the CNS. Lipid rafts appear to be involved here, and keep in
mind that cannabinates, and anandamide I think, increase ceramide
production. In the short term no problem, over the long term however this
does appear to increase the likelihood of cell death. Strangely though, I
vaguely recall one article which claimed that ceramide can also alter the
conformational structure of trka, thereby causing at least partial
generation of second messengers associated with the same. For maturing cells
trka activation can be toxic. Note: microglia can generate CD 40 and CD40 L,
and those microglia that will differentiate into a Dendritic cell like
lineage will express il12p40. Perhaps to think about A and C in relation to
johnYYYcoe at tpg.com.au
remove YYY in reply
"BilZ0r" <BilZ0r at TAKETHISOUThotmail.com> wrote in message
news:Xns93D970B67A6EFBilZ0rhotmailcom at 188.8.131.52...
> >> Don't get me wrong, the the in vitro studies arn't directly
> >> comparable to recreational/clinical usages of cannabinoids, but they
> >> do point out a need for caution. Also, you say that no neurtoxicity
> >> has been shown in vivo with sensible doses. It depends on how you
> >> define sesnible doses, if we account for the usual interspecies
> >> dosing changes, the doses given to mice to produce "neurotoxicity"
> >> are not that outlandish.
> > The preponderance of evidence clearly points to strong neuroprotective
> > effects in vitro.
> Well that depends. Put the system under stress from excitotoxicity,
> cannabinoids (especailly exogenous) and you'll protect.
> There are about 4 different research groups, and about 6 differen't
> articles that all show that t anandamide is neurotoxic.
> Whether its CB1, VR1 or lipid raft mediated is the question.
> That also brings me to the point: I wish people would start using and
> opiate/opiod style diferentiation for cannabinoids. I.e. Cannabinoids are
> any chemicals which bind to CB receptors, while cannabinates are anything
> which comes from cannabis.. or something like that anyways.
More information about the Neur-sci