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Confused about NMDA /D1D2 sensitiszation mechanisms

monoamine

Bluelighter
Joined
Dec 14, 2003
Messages
92
I know in the past they focused on changes in pre-synaptic D2 autoreceptors (I think) as the mechanism for tolerance and sensitization. It's been years since I was on adderall, and they've been tough years. I have a good opportunity and so have restarted Dexedrine to study this boring ass certification (tax law). If there was ever a more clear and present need for stimulants I would be surprised. After 3 days, my original dose lost effectiveness. Having rode this train before, I want to prevent or . . . impede this same development.

That being said, I hear NMDA blockade through a frontal loop leads to the sensitization. I did try namenda for a period of time long ago (10 years past), expecting it to reverse my tolerance, which it did not.

So, trying to figure this out now: Is there a connection between D2 up/down regulation and Glutamate or at least NMDA channels? I think I can get Memantine again my doctor is open-minded.

I'm hoping that, as I can see I'm outclassed even studying chemistry, someone may be able to give me literature on a connection between D2 dysregulation and NMDA channels? I've read, actually, of connections between D1 and NMDA. . . it's too much for me to digest and I'm seeing my pdoc wed. This could be the opportunity of a lifetime for me, hence all the pubmed searches and this question(s). Thank you. It is appreciated, PM me if you like. I have about 3/4 of a degree in biochem, decided to quit. If NMDA and D2/D1 are unrelated it seems like what's the point of the NMDA allosteric modulation? Does it still help? Well, thanks so much more than I can express in words for this community. If I didn't mention, I just bought the deslym tonight. Made me pretty sleepy for first dose. I just want to make it work say 4 or 5 days a week and not be an asshole to people when I'm recovering. I have Zn, and I'll get chelated Mg when I can as well. Again, thanks so much.
 
Hmm, I'll send this over to ADD for you. They love questions like this =D
 
thx =) Don't know if I mentioned it but I found that nmda blockade on D1, but not so much D1 and D2 at the same time, blocks sensitization . . that's my hypothesis on why memantine isn't 100% It would be interesting to try a D1 antagonist?
 
I don't know where my first reply got posted to, so I'll repost here. Thanks for the literature links, much appreciated. Also, I found this whilst searching for d1 antagonists on wikipedia: SKF-83,959 is a synthetic benzazepine derivative used in scientific research which acts as a selective D1 receptor antagonist and D5 receptor full agonist, as evidenced by the fact that it has high affinity for both receptors and stimulates the D5-linked PLC/PI second messenger pathway without affecting the cAMP/AC pathway which is linked to D1.[1][2][3]. Maybe D1 antagonism along with NMDA normalization is enough to stabilize someone on a therapeutic dose of stimulants? I've yet to experience ALA along with amphetamine. I'll do a lit search for AMPA and sensitization, unless you already have the info =) thx for links again
 
NSFW:
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Don't know anything about the mechanisms, but the racetams (piracetam, aniracetam etc.) can potentiate stimulants and help with tolerance, and they're pretty easy to get hold of OTC.
 
Interesting, I might try piracetam I was just reading about it being used with memantine to counteract any deficits in long-term memory caused by NMDA antagonism. Thx
 
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