Download the Study: http://download.cell...67407003443.pdfThe current study found that brain cells in PFC contain ion channels called hyperpolarization-activated cyclic nucleotide-gated channels (HCN) that reside on dendritic spines, the tiny protrusions on neurons that are specialized for receiving information. These channels can open when they are exposed to cAMP (cyclic adenosine monophosphate). When open, the information can no longer flow into the cell, and thus the network is effectively disconnected.
It seems that you guys are dead right about cAMP in the PFC being a very big problem. This is not going to be peculiar to Forskolin/Artichoke, but rather to anything which indiscriminately increases cAMP production, as mere exposure to high levels of cAMP locks open the HCN channels. This can lead to LTP, or it can lead to a dysfunction in the brain's ability to moderate itself and engage in necessary inhibitory actions from run-away neurotransmission.
Incidentally, it also explains why I simply have not noticed any of these working memory deficits that people have been describing. You see, I am solidly diagnosed as ADHD, and as such elevated cAMP levels in the Prefrontal Cortex, and thus low working memory, involuntary hyperfocus, and higher stress levels in general are a normal part of my everyday mental state.
In other words, and not to put too fine a point on it, I think that CILTEP might actually be inducing partial symptoms of ADHD! It's ADHD-memetic!
But don't fret, there is hope! A lot of research has been put into this angle of ADHD-type disease, and there are treatments. That would be a great place to start when looking for a possible cure for this working memory deficit.The study also found alpha-2A adrenergic receptors near the channels that inhibit the production of cAMP and allow the information to pass through into the cell, connecting the network. These receptors are stimulated by a natural brain chemical norepinephrine or by medications like guanfacine.
There are already chemicals that work on these channels, which are primarilly focused in the Amygdala and the Prefrontal Cortex."Guanfacine can strengthen the connectivity of these networks by keeping these channels closed, thus improving working memory and reducing distractibility," she said. "This is the first time we have observed the mechanism of action of a psychotropic medication in such depth, at the level of ion channels."
But wait, it gets better.Arnsten said the excessive opening of HCN channels might underlie many lapses in higher cognitive function. Stress, for example, appears to flood PFC neurons with cAMP, which opens HCN channels, temporarily disconnects networks, and impairs higher cognitive abilities.
Stress seems to be a related function, here. And there has been a lot of mention about irritability and stress from some people on this stack (and some of the even polite conversation seems strained, at times, by worry, anxiety, and bravado. I am not exempt.)
There is a downside to Guanfacine, however: It is a prescription medication. But it's function is as a Central α2 adrenergic receptor agonist. And as it turns out, some of our fellow Longecity members have looked into this, quite extensively: http://www.longecity...lpha-2-agonist/
Another angle to look at, here, is intracellular Mg+ levels, which is one of the cofactors in closing those HCN channels, albeit in a voltage dependant way. And when researching this, I found a very troubling study:http://www.ncbi.nlm..../pubmed/9030202Caffeine has been extensively used to study intracellular Ca2+ control and contraction-relaxation in cardiomyocytes. The effects of caffeine on intracellular free Mg2+ concentration, [Mg2+]i, were studied in isolated adult rat ventricular myocytes by fluorescent techniques using mag-fura-2. Basal [Mg2+]i was 0.62 +/- 0.02 mM, n = 54, in quiescent cells and 0.73 +/- 0.02 mM, n = 23, in electrically-stimulated adult rat ventricular myocytes. Caffeine, 20 mM, significantly decreased [Mg2+] in both quiescent (-0.17 +/- 0.01 mM) and electrically-stimulated (-0.16 +/- 0.01 mM) adult ventricular myocytes. Ryanodine, a blocker for Ca(2+)-release channels of the sarcoplasmic reticulum, did not have any effect on basal [Mg2+]i, 0.67 +/- 0.02 mM nor on caffeine-induced reduction in [Mg2+]i, -0.16 +/- 0.01 mM in quiescent cardiomyocytes or electrically-stimulated cells; 0.74 +/- 0.03 mM and -0.11 +/- 0.03 mM, respectively. Ruthenium red, an inhibitor of mitochondrial Ca2+ uptake, also failed to alter basal [Mg2+]i, or caffeine-induced reduction in [Mg2+], in either quiescent or electrically-stimulated cells. The effects of caffeine on [Mg2+]i, may be important in considering the use of this drug to study contraction/function studies in heart cells.
http://www.ncbi.nlm....pubmed/16846100Some previous studies have reported the involvement of magnesium (Mg) deficiency in children with ADHD syndrome. In this work, 40 children with clinical symptoms of ADHD were followed clinically and biologically during a magnesium-vitamin B6 (Mg-B6) regimen (6 mg/kg/d Mg, 0.6 mg/kg/d vit-B6) which was set up for at least 8 weeks. Symptoms of ADHD (hyperactivity, hyperemotivity/ aggressiveness, lack of attention at school) were scored (0-4) at different times; in parallel, intraerythrocyte Mg2+ (Erc-Mg) and blood ionized Ca2+ (i-Ca) were measured. Children from the ADHD group showed significantly lower Erc-Mg values than control children (n = 36). In almost all cases of ADHD, Mg-B6 regimen for at least two months significantly modified the clinical symptoms of the disease: namely, hyperactivity and hyperemotivity/aggressiveness were reduced, school attention was improved. In parallel, the Mg-B6 regimen led to a significant increase in Erc-Mg values. When the Mg-B6 treatment was stopped, clinical symptoms of the disease reappeared in few weeks together with a decrease in Erc-Mg values. This study brings additional information about the therapeutic role of a Mg-B6 regimen in children with ADHD symptoms.
So basically, so sum that all up, it seems that Caffeine, specifically, aggrivates the same situation that the increased cAMP does, in reguards to the stuck-open HCN channels, and that increased Mg2+ may be a possible method of amelioriating that issue.
Anecdocally, I have been supplementing a product called "Krebs Cycle Chelates", from Enzymatic Therapy, along with fairly high doses of activated B-Complex. Fundimentally, what these contain are a very broad spectrum mineral supplement, the highest by weight being Magnesium and Calcium (both involved in nerve transmission potentials), all chelated to citrate, fumarate, maleate, succinate, and alpha ketoglutarate, along with complexed B-vitamins in their active forms. If those names don't ring a bell, they should. They are part of the Citric Acid Cycle in generating ATP, which is located in the mitochondria of cells, and could most definitely be considered as "intracellular". This could also be one of the reasons, in addition to already suffering from increased PFC cAMP levels, that I am not experiencing the noticeable working memory deficits that others seem to be. I thought this substance to be just a general mediator of ATP synthesis, but more and more I am finding that it has other effects that I had not anticipated.
Also, guess what mineral is present in Cocoa in high amounts?
Jeoshua
Very interesting finding...
The thing is that I don't have good result with this stack like other people dicribe.
Maybe some more energy and focus but slight.
But I have ADHD-PI (ADD)
Low Serotonin & Dopamine Levels I think?
That means too much inhibition of my one?? and maybe that only need to increase cAMP production?
Thus no architchoke...
But after reading:
"as mere exposure to high levels of cAMP locks open the HCN channels. This can lead to LTP, or it can lead to a dysfunction in the brain's ability to moderate itself and engage in necessary inhibitory actions from run-away neurotransmission."
I thing is better to wait
I must say that caffeine by itself is a pretty good nootripic (0,1gr)
Are there other people with ADD here? With no effect with ciltep.
And if you have good results...what your secret
Edited by row1, 11 January 2014 - 10:18 AM.