Cognitive Loss/Impaired Sensory Gating from HCN Channels - Recovered by PDE4 Inhibition or an α2A Receptor Agonist

Today we have a complex dysfunction, but we have a plausible understanding of the detailed biological underpinnings and several therapeutic options. It is relevant to people with autism who have impaired sensory gating (they find noises like a clock ticking annoying), and perhaps those who struggle with complex thought. It is very likely to be disturbed in some people with ADHD and many with schizophrenia.

Trouble in the Pre-Frontal Cortex

For a recap on sensory gating, here is an earlier post:-

Sensory Gating in Autism, Particularly Asperger's

Today’s dysfunction relates to HCN channels located on those tiny dendritic spines in a part of the brain called the pre-frontal cortex. These are a type of voltage gated potassium channel found in your brain and heart, there are 4 types, it looks to me that HCN2 is the key one today.

The pre-frontal cortex (PFC) is seen as the part of the brain most affected by mental illness (schizophrenia, bipolar, ADHD etc.), although medicine’s current understanding looks rather medieval to me.

These HCN 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 (created by numerous interacting neurons) is effectively disconnected.

By keeping these channels closed, it is thought that you can improve working memory and reducing distractibility. Now you might think distractibility is an odd word, and it is not a word I expected to encounter, what it really means is impaired sensory gating. This is a core feature of Asperger’s, ADHD and schizophrenia.

One of the key risk genes for schizophrenia, DISC1, also affects HCN channels and this may account for some of the cognitive deficit found in schizophrenia. High level thinking is particularly affected.  It is thought that loss of DISC1 function in the PFC would likely prevent proper PDE4 function, leading to a dysregulated build-up of cAMP in dendritic spines resulting in excessive opening of HCN channels

Role of disrupted in schizophrenia 1 (DISC1) in stress-induced prefrontal cognitive dysfunction

I did wonder how nicotine fits in, since in earlier post we saw that α7 nAChR agonists, like nicotine, improve sensory gating and indeed that people with schizophrenia tend to be smokers. It turns out that nicotine is also an HCN channel blocker. For a change, everything seems to fit nicely together. There are different ways to block HCN channels, some of which are indirect. One common ADHD drug, Guanfacine, keeps these channels closed, but in a surprising way.

Alpha-2A adrenergic receptors near the HCN channels, on those dendritic spines, inhibit the production of cAMP and the HCN channels stay closed, allowing the information to pass through into the cell, connecting the network. These Alpha-2A adrenergic  receptors are stimulated by a natural brain chemical norepinephrine, or by drugs like Guanfacine.

Stress appears to flood PFC neurons with cAMP, which opens HCN channels, temporarily disconnects networks, and impairs higher cognitive abilities.

This would explain why stress makes people’s sensory gating problems get worse. So someone with Asperger’s would get more distracted/disturbed at exam time at school for example, or when he goes for a job interview. Reducing stress is another method to improve sensory gating and indeed cognition. In Monty, aged 14 with ASD, the only time he exhibits significantly impaired sensory gating, is when he has stopped all his Polypill therapies for several days. I think stress/anxiety is what has changed and this opens those HCN channels. Then even the sound of someone eating food next to him makes him angry.

Excessive opening of HCN channels might underlie many lapses in higher cognitive function.

While the researchers at Yale patented the idea of HCN blockers to improve cognition, we can see how other existing ideas to improve cognition may indeed have the same mechanism, most notably PDE4 inhibitors.

The University of Maastricht holds patents on the use of Roflumilast, a PDE4 inhibitor, to improve cognition; most interestingly, this takes effect at one fifth of the COPD dosage, for which it is an approved drug. At high doses PDE4 inhibitors have annoying side effects, but at low doses they tend to be trouble-free.

One effect of a PDE4 inhibitor is that it reduces cAMP. So a PDE4 inhibitor acts indirectly like an HCN blocker.

Not surprisingly recent research showed that low doses of Roflumilast improves sensory gating in those affected by this issue.

So rather than waiting for a brain selective HCN blocker, the potential exists to use a one fifth dose of Roflumilast today. This is something that should indeed be investigated across different types of cognitive dysfunction.

There are numerous dysfunctions that can impair cognition and they can occur in different diagnosis. For example impaired autophagy is a key feature of Huntington’s, impaired remyelination defines multiple sclerosis, low levels of nerve growth factor are a key feature of Rett syndrome. Less severe dysfunctions of these processes occur in entirely different conditions.

It is thought that people with Alzheimer’s might benefit from PDE4 inhibition. If it was me, I would try it in all types of dementia or cognitive loss of any kind.

PDE4 Inhibitors

There have been many mentions of PDE4 inhibitors elsewhere in this blog. They are broadly anti-inflammatory and anti-oxidant, but currently only widely used to treat asthma in Japan and COPD in Western countries. COPD is a kind of very severe asthma.

Traditionally a PDE4 inhibitor is thought of as drug used to block the degradative action of phosphodiesterase 4 (PDE4) on cyclic adenosine monophosphate (cAMP). That all sound complicated, just think of it as increasing cAMP.

Now cAMP is a messenger in many biological processes, one of which relates to PKA (Protein Kinase A). In autism we know that PKA, PKB and PKC are often disturbed. These PKs are very important because they have the ability to literally change the function of thousands of proteins in your body. This is similar to how epigenetic tags can switch on or switch off a particular gene. PKs, via a different mechanism we will look at in another post, change the function of proteins, so it is very important that you have the correct level of PKA, PKB and PKC.

We saw in a recent post that the Pitt Hopkins gene TCF4 is regulated by PKA and that under-expression of TCF4 is also a feature of some ID and schizophrenia. So more PKA, please.

The Intellectual Disability and Schizophrenia Associated Transcription Factor TCF4 Is Regulated by Neuronal Activity and Protein Kinase A 

You can use a PDE4 inhibitor to increase cAMP, which then increases PKA.

Other effects of PDE4 inhibitors

Today’s post is about sensory gating and the effect here of PDE4 inhibitors is via the effect of cAMP on those HCN channels in your tiny dendritic spines.

There are numerous other effects of PDE4 that may also be therapeutic. One interesting effect is that inhibition of PDE4 can mimic calorie restriction by activating AMPK/SIRT1 pathway.

Calorie restriction has just been shown in a large trial to be able to reverse type 2 diabetes, if initiated with a few years of the disease developing.

Humans have evolved based to periods of feast and famine. Periods of fasting may be therapeutic for many modern conditions.

Not surprisingly one side effect of PDE4 inhibitors is weight loss. Many psychiatric drugs cause troubling weight gain.

Acute administration of Roflumilast enhances sensory gating in healthy young humans in a randomized trial. 

Abstract

 

INTRODUCTION:

Sensory gating is a process involved in early information processing which prevents overstimulation of higher cortical areas by filtering sensory information. Research has shown that the process of sensory gating is disrupted in patients suffering from clinical disorders including attention deficit hyper activity disorder, schizophrenia, and Alzheimer's disease. Phosphodiesterase (PDE) inhibitors have received an increased interest as a tool to improve cognitive performance in both animals and man, including sensory gating.

METHODS:

The current study investigated the effects of the PDE4 inhibitor Roflumilast in a sensory gating paradigm in 20 healthy young human volunteers (age range 18-30 years). We applied a placebo-controlled randomized cross-over design and tested three doses (100, 300, 1000 μg).

RESULTS:

Results show that Roflumilast improves sensory gating in healthy young human volunteers only at the 100-μg dose. The effective dose of 100 μg is five times lower than the clinically approved dose for the treatment of acute exacerbations in chronic obstructive pulmonary disease (COPD). No side-effects, such as nausea and emesis, were observed at this dose. This means Roflumilast shows a beneficial effect on gating at a dose that had no adverse effects reported following single-dose administration in the present study.

CONCLUSION:

The PDE4 inhibitor Roflumilast has a favourable side-effect profile at a cognitively effective dose and could be considered as a treatment in disorders affected by disrupted sensory gating.

Treating Cognitive Impairment with Roflumilast, Maastricht University

Background Information

Selective phosphodiesterase (PDE) inhibition has been considered as a very promising target for cognition enhancement.

Roflumilast is a PDE4 inhibitor that has been developed by Takeda for Chronic Obstructive Pulmonary Disease (COPD). In recent year, Maastricht University has been collaborating with Takeda to develop Roflumilast for cognitive impairments

In 2015 Takeda sold COPD indication of Roflumilast to AstraZeneca, and ownership of IP for treatment of cognitive impairment returned to Maastricht University.

Compelling clinical results

A single administration of Roflumilast improves episodic memory in mice, and in young and elderly healthy subjects at a non-emetic dose

As shown in the figure, healthy (A) and memory impaired (B) elderly subjects showed better performances in the delayed recall of the Verbal Learning Task after roflumilast

Key Features and Advantages

Opportunities to reposition a clinically-proven safe compound with a well-established pharmacology.

Compelling preclinical and clinical evidences showing that Roflumilast effectively deliver to the brain to produce robust cognitive enhancement.

Pro-cognitive effects at low dose (5 times lower than COPD indication), which allows to circumvent the emetic effects commonly observed with other PDE4 inhibitors

Maastricht University has a strong IP protection extending to at least 2033.

Effect of Roflumilast on cognitive function in schizophrenia

PDE inhibitors in psychiatry--future options for dementia, depression and schizophrenia?

Author information

Abstract

Phosphodiesterases are key enzymes in cellular signalling pathways. They degrade cyclic nucleotides and their inhibition via specific inhibitors offers unique 'receptor-independent' opportunities to modify cellular function. An increasing number of in vitro and animal model studies point to innovative treatment options in neurology and psychiatry. This review critiques a selection of recent studies and developments with a focus on dementia/neuroprotection, depression and schizophrenia. Despite increased interest among the clinical neurosciences, there are still no approved PDE inhibitors for clinical use in neurology or psychiatry. Adverse effects are a major impediment for clinical approval. It is therefore necessary to search for more specific inhibitors at the level of different PDE sub-families and isoforms.

Brain Networks Strengthened By Closing Ion Channels, Research Could Lead To ADHD Treatment

The 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. Arnsten said inhibiting cAMP closes the channels and allows the network to reconnect.

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."

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.

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.

 “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.”

Yale has submitted a patent application on the use of HCN blockers for the treatment of PFC cognitive deficits based on the data reported in the Cell paper.

The full Yale paper:

α2A-Adrenoceptors Strengthen Working Memory Networks by Inhibiting cAMP-HCN Channel Signaling in Prefrontal Cortex

Guanfacine for the Treatment of Cognitive Disorders: A Century of Discoveries at Yale

The prefrontal cortex (PFC) is among the most evolved brain regions, contributing to our highest order cognitive abilities. It regulates behavior, thought, and emotion using working memory. Many cognitive disorders involve impairments of the PFC. A century of discoveries at Yale Medical School has revealed the neurobiology of PFC cognitive functions, as well as the molecular needs of these circuits. This work has led to the identification of therapeutic targets to treat cognitive disorders. Recent research has found that the noradrenergic α2A agonist guanfacine can improve PFC function by strengthening PFC network connections via inhibition of cAMP-potassium channel signaling in postsynaptic spines. Guanfacine is now being used to treat a variety of PFC cognitive disorders, including Tourette’s Syndrome and Attention Deficit Hyperactivity Disorder (ADHD). This article reviews the history of Yale discoveries on the neurobiology of PFC working memory function and the identification of guanfacine for treating cognitive disorders.

Nicotine blocks the hyperpolarization-activated current Ih and severely impairs the oscillatory behavior of oriens-lacunosum moleculare interneurons.

Molecular modeling suggests that, similarly to ZD 7288, nicotine and epibatidine directly bind to the inner pore of the HCN channels. It is therefore likely that nicotine severely influences rhythmogenesis and high cognitive functions in smokers.

Modulation of HCN channels in lateral septum by nicotine

Conclusion

I think many people stand to benefit from the drugs mentioned in today’s post, but for different biological reasons. A person with Pitt Hopkins may benefit from Roflumilast because it will upregulate PKA and then increase expression of their remaining TCF4 gene.

In a person with schizophrenia there are multiple reasons these drugs might help them and it will depend on which genes they have that are misexpressed (TCF4, DISC1 etc.).

In a person with idiopathic Asperger’s and impaired sensory gating it looks like the effect on HCN channels is what is important.

I think low dose Roflumilast has great potential for many. The Japanese drug Ibudilast very likely will provide similar benefits, but at what dosage?

PDE4 inhibitors do have side effects at higher doses in part because there are several different types of PDE4 (PDE4A, PDE4B, PDE4C etc) and different drugs effect different subtypes differently.

Ibudilast is used as a daily drug therapy for asthma in Japan and is being studied as a therapy for Multiple Sclerosis (MS) in the US.

Roflumilast is sold by Astra Zeneca as Daxas/Daliresp but at a high dose of 500mcg to treat flare ups of COPD (Chronic Obstructive Pulmonary Disease) it does cause troubling side effects, but it reduces your chance of dying from COPD.

The cognitive dose used in research is 100mcg. Higher doses had no cognitive/sensory gating benefit.

Further investigation of the ADHD drug Guanfacine should be made, because some of the people who benefit from a PDE4 inhibitor might get a similar effect from Guanfacine. People with Pitt Hopkins would not be in this category. A person with Asperger’s and impaired sensory dating should respond to Guanfacine, a cheap drug.

At the end of the day, choice of therapy will come down to side effects and cost. In the US, Roflumilast is expensive ($330), seven times more expensive than in some other countries; in the UK the price of the same 30 tablets is $50. One pack would be enough for 5 months at the suggested dose.

Beetroot - Cold Hands, Leukoaraiosis, Psychosis and Anxiety in Schizophrenia

Karimnagar, India, where Schizophrenic Rats respond well to Beetroot Juice

If you are not old enough to be interested in dementia, skip through those parts of this post and read about schizophrenic mice and beetroot juice.

There have been earlier posts regarding using nitric oxide (NO) to improve circulation and derive a cognitive benefit.

Many sportsmen have followed up on the research studies that show exercise endurance is improved after taking beet root juice. Since it is not a banned substance they are free to benefit from it.

We know that beet root does not only reduces blood pressure but it actually can increases perfusion, or blood flow, to the brain. Reduced blood flow to the brain is a feature of some dementia. Studies have used MRI to show that circulation is increased. A follow up study has recently been published which shows that beet root juice combined with exercise produced MRI results that resemble those of much younger adults.

In a previous post we saw that cocoa flavanols improved memory in older people and in effect brought them back to where they used to be 20 years previously. With cocoa the mechanism is not fully understood by is believed to “activate the nitric oxide system” in the brain. Cocoa does not produce nitric oxide in the way beet root does. Foods like beetroot and spinach contain large amounts of nitrates and they cause a measurable increase in circulating nitrites in the blood. The nitrites can later on become nitric oxide.

There is a lot of research into cocoa flavanols, mainly in relation to its benefit for those heart disease and more recently dementia. It also has benefits for anyone with diabetes, because it increases insulin sensitivity, as some readers of this blog have confirmed.

Cocoa flavanols appear to indirectly increase eNOS which then leads to more Nitric Oxide (NO). In addition there are antioxidant effects. eNOS reacts with L-arginine to produce NO.

But there is another way to make Nitic Oxide (NO), via nitrite that is circulating in your blood.  To increase nitrite you just eat nitrates, green leafy vegetables and beetroot.

It appears that eNOS does affect nitrite levels, so perhaps more eNOS means more NO is produced and then nitrite stays as nitrite and so the level of nitrite increases. Everything is inter-related.

Source: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3575935/table/tbl1/

Interestingly, statin drugs increase circulating nitrite levels just like beetroot.

NO bioavailability is determined by the balance between NO biosynthesis and its degradation by reactions with hemoglobin and reactive oxygen species (ROS).

Simvastatin treatment increases nitrite levels in obese women: Modulation by T−786C polymorphism of eNOS

eNOSgene T-786C polymorphism modulates atorvastatin-induced increase in blood nitrite.

So in people with oxidative stress there will be less NO. 

The nitrate-nitrite-nitric oxide pathway: Its role in human exercise physiology 

Nitric oxide (NO) is a potent signaling molecule that influences an array of physiological responses. It was traditionally assumed that NO was derived exclusively via the nitric oxide synthase (NOS) family of enzymes. This complex reaction requires a five electron oxidation of L-arginine and is contingent on the presence of numerous essential substrates (including O₂) and co-factors. Recently an additional, O₂-independent, NO generating pathway has been identified, where nitrite (NO₂ ⁻) can undergo a simple one electron reduction to yield NO. NO₂ ⁻ is produced endogenously from the oxidation of NO and also from the reduction of dietary nitrate (NO₃ ⁻) by facultative bacteria residing on the tongue. Recent data show that dietary NO₃ ⁻ supplementation, which increases the circulating plasma [NO₂ ⁻], reduces the O₂ cost of submaximal exercise in healthy humans. This finding is striking given that efficiency during moderate-intensity exercise has been considered to be immutable. Therefore, dietary NO₃ ⁻ supplementation may represent a practical and cost-effective method to improve exercise efficiency and exercise tolerance in humans. Given that a NO₃ ⁻-rich diet may have numerous cardiovascular and other health benefits, dietary NO₃ ⁻ intake may have important implications for human lifelong health and performance.

   

Cold hands

People with poor circulation tend to have cold hands and feet. From the comments in this blog it appears that many people with autism have cold hands/feet.

Do the many Nitric Oxide producing therapies used by sportsmen “warm up” cold hands?

Well we do actually now have some data on this subject. 

Beetroot fails to warm up those sensitive to cold

At least in the case of beetroot the answer is no.

L-arginine, L-citrulline, eNOS and NO    

It does appear that more eNOS can be beneficial. More eNOS means more NO as long as there is enough L-arginine. If you want to make more L-arginine, the most effective way is to eat L-citrulline, which is abundant in water melon.

It looks like some people lack arginine while others lack eNOS.  The males in clinical trials of citrulline and water melon, as a Viagra alternative, must lack L-arginine.

I think in autism the problem is lack of eNOS.

I thought L-citrulline might increase the positive effect of Agmatine that is very evident in Monty, aged 14 with ASD, but it has no additional effect.

Maybe some people do lack eNOS and l-arginine.

You do not need eNOS to make nitric oxide from the nitrites produced by beetroot juice.

Agmatine

We previously saw that the OTC supplement Agmatine increases eNOS, but it also actually affects BDNF.

Effects of agmatine on cognitive functions during vascular dementia in biological aging through eNOS and BDNF expression

Taken together, the findings of this study show that long-term agmatine administration increases the BDNF levels in both the hippocampus and amygdala, and also peripherally the NO synthesis and/or bioavailability, and corrects the age-related endothelial dysfunction, and hence may help in recovering vascular aging and vascular dementia.

Leukoaraiosis

Leukoaraiosis is a new word to this blog, it is very relevant to dementia, but it would likely only be relevant to autism if there has been hypoxia (lack of oxygen). Two readers of this blog do report hypoxia.

There is a lot of information in this blog about treating dementia and so for the sake of completeness I will elaborate further.

It appears that most people with Mild Cognitive Impairment (MCI) or dementia have lsome eukoaraiosis.

Leukoaraiosis also referred as ischemic demyelination or age-related white matter disease, is a radiological term given to white spots that appear on your MRI scan.

It is commonly observed in elderly people, and it is often a finding related to vascular dementia.  Histology from these lesions show atrophy of axons and decreased myelin. It is thought that localized hypoxia is what caused the damage.

On both CT and MRI, leukoaraiosis is characterized by bilateral patchy or confluent white matter changes.

So if your “autism” resulted from hypoxia, you might expect to see white spots on your MRI scan.

What is interesting is that leukoaraiosis may contribute to ongoing mild hypoxia.

It always seemed odd that people might benefit from HBOT (hyperbaric oxygen) years after they suffered acute hypoxia; but if the acute hypoxia left leukoaraiosis, perhaps this then reduces ongoing blood flow and thus leaves mild localized hypoxia, which does respond to treatment.

When blood flow is interrupted to part of the brain your doctor would call that a stroke.  A mini-stroke occurs when that blood flow is only temporarily interrupted.  These so-called transient ischemic attacks (TIA) are a warning sign of what may come shortly afterwards.

It appears in many people mini-strokes occur but remain unreported.

As a result of mini-strokes and/or leukoaraiosis perfusion in older people is not as good as in younger people and so cognition and memory suffer.

This can be partially addressed by making your blood more “slippery” using low dose aspirin, but the risk is that over the years blood vessels have narrowed and become brittle.  You then risk micro bleeds where the blood vessel cracks and the “slippery” blood can leak out.  This does happen in the brain

Cerebral microbleeds are not rare and are seen as another cause of cognitive impairment.

Cerebral microbleeds: overview and implications in cognitive impairment

The conclusion for adults is that prevention is much better than cure. A diet rich in nitrates (spinach beetroot etc) and flavanols (cocoa etc) plenty of exercise and avoiding half a century of high cholesterol looks a wise choice. 

Silent Strokes ,Leukoaraiosis and Vascular diseases in cognitive impairment in the island of Guam

Emerging evidence suggests that silent strokes or lacunar infarctions, leukoaraiosis, and vascular diseases may be associated with cognitive impairment including dementia. We assessed the occurrence of these risk factors among various spectrum of cognitive dysfunction. A retrospective review of patients evaluated in Guam with the diagnosis of Memory Loss, Mild Cognitive Impairment (MCI) and Dementia from August 2006 to December 2014 was conducted. The history of stroke and co-morbid vascular diseases was identified. The neuro-imaging studies were reviewed to determine the presence of silent strokes and leukoaraiosis in patients without history of a clinical stroke. There were 585 patients included in the analysis. One hundred forty two patients having a diagnosis of memory loss, 95 have MCI and 348 have dementia. A history of stroke was present in 29% of patients with Memory Loss, 20% of patients with MCI and 30% of patients with dementia. Silent strokes without a history of clinical stroke were present in 10% of patients with memory loss and MCI, and 15% of patients with dementia. The presence of Leukoaraiosis was present in 50% of patients with memory loss, 56% of patients with MCI, and 60% of patients with dementia. Occurrences of vascular diseases were higher in patients with dementia than patients with Memory Loss and MCI. In conclusion, silent strokes, leukoaraiosis and vascular diseases are found to be more prevalent in patients with Dementia than those with Memory Loss and MCI.  

Tiny Brain Lesions Change Thinking Process of the Elderly

Oxygen deprived areas of the brain can change the way the brain functions in older adults. These areas of the brain were thought to be just a normal part of aging and could lead to other diseases such as Alzheimer's or stroke.

Leukoaraiosis is described as a condition where brain scans (CT or MRI) show bright white dots. These areas of the brain are deprived of oxygen and were considered to be a normal part of aging process.

"There has been a lot of controversy over these commonly identified abnormalities on MRI scans and their clinical impact. In the past leukoaraiosis has been considered a benign part of the aging process, like gray hair and wrinkles," said Kirk M. Welker, M.D., assistant professor of radiology in the College of Medicine at Mayo Clinic in Rochester, Minn., in a press release.

The condition is common in people who are above the age of 60. Recently, leukoaraiosis has been linked to diseases like Alzheimer's, hypertension and stroke.

"We know that aging is a risk factor for leukoaraiosis, and we suspect that high blood pressure may also play a role," Dr. Welker said.

Researchers from the Mayo Clinic obtained brain scans from 18 participants over the age of 60. The brain scans of these participants were matched against those obtained from a control group. Researchers found that these participants had lesions in the brain that were 25 millimeters long while some lesions in the brains of control group participants were about five millimeters long.

The participants were given tests based on words and visual patterns. All the participants were connected to brain scanners during the tests.

The participants of control group and study group completed the task with similar speed. However, researchers found that the brains of people who had moderate leukoaraiosis worked differently than people who had mild lesions.

They found that areas of brains that performed word-association tasks weren't activated during the test but areas that process visual patterns were highly activated.

"Different systems of the brain respond differently to disease. White matter damage affects connections within the brain's language network, which leads to an overall reduction in network activity," Dr. Welker said.

Welker said that diagnosing leukoaraiosis is important in people who are above 60, especially those who have to undergo brain surgery and those who are part of scientific research study.

Previous research shows that the probability of stroke increases with increase in leukoaraiosis spread.

"Our results add to a growing body of evidence that this is a disease we need to pay attention to Leukoaraiosis is not a benign manifestation of aging but an important pathologic condition that alters brain function," Welker said.  

Finally, now you know all about leukoaraiosis, back to beet root juice.

With beetroot juice before  exercise, aging brains look ‘younger’

Beet Root Juice: An Ergogenic Aid for Exercise and the Aging Brain

Background:

Exercise has positive neuroplastic effects on the aging brain. It has also been shown that ingestion of beet root juice (BRJ) increases blood flow to the brain and enhances exercise performance. Here, we examined whether there are synergistic effects of BRJ and exercise on neuroplasticity in the aging brain.

Methods:

Peak metabolic equivalent (MET) capacity and resting-state magnetic resonance imaging functional brain network organization are reported on 26 older (mean age = 65.4 years) participants randomly assigned to 6 weeks of exercise + BRJ or exercise + placebo.

Results:

Somatomotor community structure consistency was significantly enhanced in the exercise + BRJ group following the intervention (MBRJ = -2.27, SE = 0.145, MPlacebo = -2.89, SE = 0.156, p = .007). Differences in second-order connections between the somatomotor cortex and insular cortex were also significant; the exercise + BRJ group (M = 3.28, SE = 0.167) had a significantly lower number of connections than exercise + placebo (M = 3.91, SE = 0.18, p = .017) following the intervention. Evaluation of peak MET capacity revealed a trend for the exercise + BRJ group to have higher MET capacity following the intervention.

Conclusions:

Older adults who exercised and consumed BRJ demonstrated greater consistency within the motor community and fewer secondary connections with the insular cortex compared with those who exercised without BRJ. The exercise + BRJ group had brain networks that more closely resembled those of younger adults, showing the potential enhanced neuroplasticity conferred by combining exercise and BRJ consumption.  

BRJ is clearly an encouraging nutritional supplement that may improve functional health in older adults, and the proposed primary mechanism of benefit of BRJ is the rise in plasma nitrite caused by the high levels of dietary nitrate in BRJ (32). Consumed nitrate, once absorbed from the intestine, is taken up from the plasma by salivary glands and concentrated in saliva; nitrate is subsequently reduced to nitrite by oral bacteria and ultimately absorbed into the circulatory system (32,33). Nitrite appears to be reduced to NO during hypoxia. NO is an antioxidant and a potent vasodilator (34,35), is a critical relaxation factor synthesized in endothelial cells (36,37), and is key to vascular compliance. For this study, we hypothesized that reductions in brain blood flow associated with hypertension and aging associated leukoaraiosis result in low-grade hypoxia (38) and that these reductions might be offset by the NO-mediated vasodilation in hypoxic regions due to the increased amount of circulating nitrite from the BRJ ingestion. Indeed, results from our lab have shown that 24 hours of a high nitrate diet supplemented with a single dose of BRJ leads to increased regional CBF in older adults (39). Coupled with exercise (a hypoxia-inducing activity), we propose that the biological mechanism underlying the neural plasticity shown in Figure 1 resulted from increased NO bioavailability after drinking BRJ

With beetroot juice before exercise, aging brains look 'younger': study

Performance and Health Benefits of Dietary Nitrate Supplementation in Older Adults: A Systematic Review

Supplementation with nitrate (NO₃⁻)-rich beetroot juice has been shown to improve exercise performance and cardiovascular (CV) responses, due to an increased nitric oxide (NO) availability. However, it is unclear whether these benefits are greater in older adults who have an age-related decrease in NO and higher risk of disease. This systematic review examines 12 randomised, crossover, control trials, investigating food-based NO₃⁻ supplementation in older adults and its potential benefits on physiological and cognitive performances, and CV, cerebrovascular and metabolic health. Four studies found improvements in physiological performance (time to exhaustion) following dietary NO₃⁻ supplementation in older adults. Benefits on cognitive performance were unclear. Six studies reported improvements in CV health (blood pressure and blood flow), while six found no improvement. One study showed improvements in cerebrovascular health and two found no improvement in metabolic health. The current literature indicates positive effects of dietary NO₃⁻ supplementation in older adults on physiological performance, with some evidence indicating benefits on cardiovascular and cerebrovascular health. Effects on cognitive performance were mixed and studies on metabolic health indicated no benefit. However, there has been limited research conducted on the effects of dietary NO₃⁻ supplementation in older adults, thus, further study, utilising a randomised, double-blind, control trial design, is warranted.

  

Beet Root and Schizophrenia

Having read about cocoa and beet root a long time ago, I did try both on myself. I think beet root has effects that go well beyond lowering blood pressure.

There are of course no trials of beet root in autism, but there is one in the next closest thing, schizophrenia. Unfortunately it was in rats, but nonetheless the findings are interesting.

   

EVALUATION OF ANTIPSYCHOTIC AND ANXIOLYTIC ACTIVITY OF BEET ROOT JUICE IN RATS

In recent years, there has been much focus on the apparent heterogeneity of schizophrenic symptoms. By contrast, this article proposes a unifying account emphasizing basic abnormalities of consciousness that underlie and also antecede a disparate assortment of signs and symptoms. Schizophrenia, is fundamentally a self-disorder or ipseity disturbance is  characterized by complementary distortions of the act of awareness, hyper reflexivity and diminished self-affection. Anxiety impacts people in ways that they are unaware. In the presence of anxiety, attention is highly directed towards threatening information. Recently, anxiety was found to impact task switching performance when threatening stimuli were present. In the current study, we examined the Anxiolytic and antipsychotic activity of Beet Root Juice (BRJ) in rats. This study reveals that the BRJ has showed decreased effects of turning behaviour, weaving behaviour, head bobbing and falling behaviour. It also showed decreased effect of loco motor activity and increase in catalepsy scoring. Thus it shows anti psychotic and anti anxiety effects.

Ketamine-Induced Stereotypic Behaviour in Mice

Animals were divided into five groups and each group consisted of four animals. The control animals received normal diet and treated with Ketamine (50 mg/kg) for 15 consecutive days. The animals of standard groups received Olanzapine (5 mg/kg) after 30 min Ketamine was given, (50 mg/kg) for 15 consecutive days. The animals of test groups received different concentrations of BRJ (2 , 4, 8% w/w) through a specially prepared diet and after 30 min Ketamine was given (50 mg/kg) for 15 consecutive days. Each rat was individually placed into plastic cages (37 × 24 × 30 cm3) divided into quadrants by lines on the floor and allowed to acclimatize for at least 30 min before the testing began. Behavioural tests were performed between 10 a.m. and 4 p.m. The stereotypic behaviour was assessed by counting the number of turning, weaving, head-bobbing and ataxia. Turning was measured by counting turn around every 15 min over 60 min. Weaving and head-bobbing were measured by counting its neck wave right and left, and go up and down every 15 min over 60 min. Ataxia was assessed by counting the number of falls of each rat on the floor of the cage every 15 min over 60 min period

Beet root juice was as effective as Olanzapine, an antipsychotic medication used to treat schizophrenia and bipolar disorder. (Ketamine is what creates the stereotypy)

Beet root juice was more effective than Haloperidol, a typical antipsychotic medication used in the treatment of schizophrenia, tics in Tourette syndrome and  mania in bipolar disorder

Beet root was as effective as Diazepam (aka Valium), is a medication of the benzodiazepine family that typically produces a calming effect 

I found the above paper very surprising. It certainly supports my feeling about the effects of beet root juice being beyond just lowering blood pressure. It definitely has a calming effect on me, so it is not just in rats.

Beetroot Juice for Autism?

Why not try just try it?

It does taste better when it is 25% apple juice and 75% beetroot.

You can also use freeze dried beetroot powder, which can be put in capsules.

It is not clear the amount of powder you need.

>150 ml a day of juice gives the exercise endurance effect and the calming (Diazepam) effect.  I would guess 2 or 3 fresh beet root would be equivalent.

Freeze dried beet root powder appears to remove 90% of the weight. So 3g of powder equals about 30g of beetroot.

Some people use a teaspoon of beetroot powder to control blood pressure. 

I expect there are studies on beetroot powder and blood pressure.

I concluded in Monty, aged 14 with ASD, that while Agmatine has a significant effect from the first day citrulline has no noticeable effect whatsoever (so no lack of L-arginine).  Having just read about the rats from Karimnagar, India in the above study I started offering Monty some of my beetroot juice. I have filled some large gelatin capsules with freeze dried beetroot, but it is not clear how much you would need.  Better to stick with the juice and see if it does anything.

Beet root is rich in betaine, which is also good for you.

I think Agmatine increases eNOS and also NO, by increasing dietary nitrate we make more nitrite which is available to make more NO as it gets depleted by oxidative stress (Reactive Oxygen Species). It looks like some people with autism have no shortage of L-arginine and so there is no effect from arginine or citrulline supplementation.

I think there is a rationale to consider Agmatine and Beetroot juice. We do have the surprising results from the schizophrenic rats, which do suggest there can be a benefit. 

I have to say that after a year of drinking 150ml of beetroot juice a day, I am a convert. You do get used to the taste. 

Beetroot, cinnamon and cocoa flavanols are quite potent potential non-drug therapies for dementia and not forgetting where you left your car keys.