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Showing posts with label RAS. Show all posts
Showing posts with label RAS. Show all posts

Thursday 22 June 2023

Autism Research Merry-go-round Keeps Turning

 


Today’s post again shows that many issues raised in previous posts keep on coming back  is that good news? Only you can decide.

I start with the “old chestnut” (English idiom to imply “a tired old story”) of the Autism Tsunami. 

Then we see what has come up in the world of autism interventions in the research in the last 3 weeks, most of which regular readers will already be aware of.

·        Autism Tsunami – real or not?

·        Vitamin D

·        Bumetanide

·        Ibudilast

·        Niclosamide

·         Non-invasive brain stimulation

·         Simvastatin 

I noted the research about autism incidence coming from Northern Ireland because it was published in the Belfast News Letter.  These days it has a tiny subscription, but I am one of those who know it is the world's oldest English-language general daily newspaper still in publication, having first been printed in 1737. In 1972 a bomb warning was called in to the paper's office and, as people evacuated, an explosion went off nearby killing several people and injuring many more. Back in the early 1990s, when some people in Northern Ireland were still blowing up others with bombs, I made a visit to Northern Ireland to meet the management of this newspaper. 

Their recent article on autism incidence is very well researched considering how only about 8,000 copies are published. Keep up the good work!

Idea that 5% of all Northern Ireland's children are autistic is 'a fantasy' claims international expert

Professor Laurent Mottron was speaking to the News Letter following a claim that the rate of autism in Northern Ireland is double the rate in the rest of the UK.

Back in 2019 Prof Mottron had authored a report warning about a tsunami of over-diagnosis, saying that soon "the definition of autism may get too vague to be meaningful, trivializing the condition"

“If this trend holds, the objective difference between people with autism and the general population will disappear in less than 10 years," he had said then – and has now indicated that this “fuzziness” is what’s helping swell the numbers in Northern Ireland.

Meanwhile Jill Escher, the president of the National Council on Severe Autism, takes a different view.

She says that evidence indicates the "skyrocketing" rate of autism in Northern Ireland is real, adding: "It boggles my mind that it is not the subject of the highest possible alarm and inquiry."

"One in 20 children in Northern Ireland of school age has a diagnosis of autism," he told MPs.

"[It is] one in 57 in the rest of the UK. The need in Northern Ireland is significantly different."

To put that in perspective, that would mean 5% of Northern Irish children are diagnosed with autism, compared with 1.8% in the rest of the UK.

Prof Mottron, a psychiatrist based at Montreal University, told the News Letter "numbers such as 5% are pure fantasy... these numbers correspond to the part of the general population which has less overt socialisation, which has minimally to do with prototypical autism". 

There is a "current fuzziness of autism diagnosis and over-inclusivity," he said, leading to "a situation of perfect confusion between autistic traits and prototypical autism" (that is, mixing up people who exhibit some tendencies of autistic people with people who actually have the full-blown condition). 

"The scientific 'quasi consensus' would be around 1% everywhere on the planet,” he added.

 

So on one side we have Jill Escher and her NCSA and on the other we have a French/Canadian researcher.  This time Laurent Mottron but in my blog posts I quoted Éric Fombonne.

A paper that was mentioned both in my blog and critiqued by Jill about autism incidence and cost just got retracted.  In reality a better word is “cancelled.”  The 3 authors are very much in the politically incorrect camp of the autism debate.

I was surprised it ever got published.  

Controversial ‘cost of autism’ paper retracted 

Citing methodological issues and undeclared conflicts of interest, an autism journal has retracted a paper that forecast the prevalence and cost of autism.

The retraction note, posted last week, comes two years after Spectrum reported on backlash surrounding the paper, which was published in the Journal of Autism and Developmental Disorders in July 2021. A month after publication, the journal added an editor’s note that the study was under investigation because of criticisms of its conclusions. 

“I am glad to see that it was retracted, although at a pace that maybe is a bit frustrating in terms of how long it took. But it was the right choice,” says Brittany Hand, associate professor of health and rehabilitation sciences at Ohio State University in Columbus.

Outside experts who reviewed the paper on the journal’s behalf found that it misrepresented the rise in autism diagnoses and gave “insufficient attention” to some potential causes of the increase, such as improved surveillance and changes to the diagnostic criteria. The authors also used “higher estimates and assumptions that inflated costs,” according to the retraction note.

The authors — Mark Blaxill, Toby Rogers and Cynthia Nevison — all disagree with the journal’s decision, the note also says.

The cancelled paper is here:-

Autism Tsunami: the Impact of Rising Prevalence on the Societal Cost of Autism in the United States

 

I assume Blaxill was the driving force behind all the math, because he is the ex- management consultant, with a son with severe autism that his dad attributes to vaccines.

What I found bizarre in their paper was that they has a prevention scenario, based on what they think has already happened in rich parts of California, where they think autism incidence is falling.  It is not falling, all that is happening is that wealthy Californians are paying for treatment using insurance or their own money, and no longer burdening the State.

The “rainbow” researchers that wanted the paper retracted think that preventing autism is akin to eugenics and Dr Mengele. According to Peter, treating autism is good, while Dr Josef Mengele, byname Todesengel (German: “Angel of Death”) was as bad as you can get.    

Jill Escher and her NCSA think that you cannot prevent autism.  According to Peter, you can both minimize the incidence and severity of autism. 

A bugbear of our reader Tanya is that the NCSA have a pet hate of facilitated communication and in particular the rapid prompting method (RPM). This method worked for Tanya’s son and it opened the door to independent, un-facilitated communication. 

Always keep an open mind.

 

 

 

“our Prevention scenario is based on real rates observed among wealthy white and Asian children in the California DDS.  Severe ASD prevalence has flattened and even declined among these children since birth year 2000, suggesting that wealthy parents have been making changes that effectively lower their children’s risk of developing ASD. The Prevention scenario assumes that these parental strategies and opportunities already used by wealthy parents to lower their children’s risk of ASD can be identified and made available rapidly to lower income children and ethnic minorities, who are currently experiencing the most rapid growth in ASD prevalence”

 

New Paper Makes Case that Autism Tsunami May Threaten American Economy

A major weakness in the analysis was the “Prevention Scenario” in which future costs were projected based on “what might be possible if strategies for reducing ASD risk are identified and addressed in the near future.” As I think everyone knows, at this time there is no way to prevent autism. But the authors use the observation that autism in the DDS is declining among wealthier white families, and thus “suggesting that wealthy parents have been making changes that effectively lower their children’s risk of developing ASD.” No, it’s far more likely that wealthier families are not entering their children into the system because they access services through insurance and school districts instead.

 

Vitamin D as a cause of autism has been discussed for decades.  As the title below puts it – a never-ending story. Our reader Seth Bittker even wrote a paper about it. He later wrote a paper about the use Acetaminophen/Paracetamol in children under two as a risk factor in developing autism. Good work Seth!

 

Maternal Vitamin D deficiency and brain functions: a never-ending story 

A large number of observational studies highlighted the prevalence rates of vitamin D insufficiency and deficiency in many populations as pregnant women. Vitamin D is well known to have a crucial role in differentiation and proliferation, as well as neurotrophic and neuroprotective actions in brain. Then, this micronutrient can modulate the neurotransmission and synaptic plasticity. Recent results from animal and epidemiological studies indicated that maternal vitamin D deficiency is associated with a wide range of neurobiological disease including autism, schizophrenia, depression, multiple sclerosis or developmental defect. The aim of this review is to provide a state of the art on the effect of maternal vitamin D deficiency on brain functions and development.

4.2.2. Autism

Autism spectrum disorder (ASD) is a complex neurodevelopmental disease with repetitive behaviour and difficulties in social interaction, communication and learning. Several murine studies and cohorts have demonstrated that early exposure to low levels of VD during pregnancy could be a risk factor for ASD. In 2019, Ali et al. aimed to find out the impact of a maternal VDD on early postnatal, adolescent and adult offspring. By assessing righting reflex and negative geotaxis, they found out that the pups from deficient dams showed a delay in their motor development. P12 rats from deficient females also exhibited increased ultrasound vocalization indicating an alteration in their vocal communication. Adolescent and young adult rats displayed an altered stereotyped repetitive behaviour as they had a reduced digging behaviour. Adolescent rats had less social interaction with longer latency to interact, which was not found in adult rats; however, adults were more hyperactive but showed no anxiety like behaviour.  In another animal study, maternal VDD induced an increase in the vocalizations of the pups accompanied with a decrease in cortical FoxP2, decrease in social behaviour and impaired learning and memory were observed in adult males (Table 1). Using data from the Stockholm youth cohort, Magnusson et al. examined a population of 4-17-year-old children exposed to low levels of VD during gestation and was able to report a positive association between maternal VDD and ASD. Analysing the same cohort, Lee et al. suggested that high levels of VD during pregnancy were associated with a moderate decrease in risk of ASD in the offspring. A prospective study of a multi-ethnic cohort in the Netherlands (generation R study) has also shown an association between maternal mid-gestation VDD and a two-fold increase in the risk of autism in children (Table 2). Interestingly, VD supplementation seems to clinically improve ASD symptoms of affected children.

 

People do associate this blog with Bumetanide.  Yet another paper has been published showing the benefits of this therapy for autism.

 

EEG-based brain connectivity analysis in autism spectrum disorder: Unravelling the effects of bumetanide treatment 


Highlights

 

·        We investigated the nonlinear brain connectivity and topological changes in brain networks of people with autism spectrum disorders (ASD) after a three-month course of bumetanide treatment.

·        We found statistically significant differences between pre and post intervention in the connectivity patterns using repeated measures analysis of variance (ANOVA).

·        We found that the number of strong connections in response to sad image stimuli seem to be less compared with that of the other two stimuli, especially in the central area.

·        We found that the changes in brain connectivity between pre and post intervention is more significant in response to sad image stimuli.

 

Emerging evidence suggests that cognitive impairment associated with brain network disorders in people with autism could be improved with medications such as bumetanide. However, the extent to which bumetanide is effective in improving brain function in these individuals has not been adequately studied. The main purpose of this study is to investigate the nonlinear brain connectivity and topological changes in brain networks of people with autism spectrum disorders (ASD) after a three-month course of bumetanide treatment. We used electroencephalography (EEG) data of nine participants recorded during the face emotion recognition activity in two stages before and after bumetanide treatment. Brain connectivity matrix was calculated using a neural network-based estimator. Graph criteria and statistical tests have been used to determine the effects of bumetanide treatment on children and adolescents with autism. Bumetanide treatment significantly alters the brain connectivity networks based on stimuli type. Differences in brain connectivity related to the sad stimuli are more significant. The most of the significant changes of the strength graph metric was in the occipital electrodes and electrodes related to the right hemisphere. These results suggest that bumetanide may affect effective connectivity and be used a promising treatment for improving social interactions in patients with autism. It also suggests that brain connectivity patterns can be considered as a neural marker to be used in the development of new therapies. 

I have also covered in sometimes painful details the potential to treat autism and increase cognitive function using PDE (Phosphodiesterase) inhibitors. One of our psychiatrist readers is a huge fan of Pentoxifylline and takes it himself.

I was recently asked how to obtain Ibudilast.  It is approved in Japan as an asthma drug. Sometimes it is called Ketas and you can get it from an “International Pharmacy” in Germany/Switzerland if you have a prescription. 

I also wrote about repurposing Roflumilast, which as Daxas is approved all over the world as a therapy for severe asthma (COPD). This drug at a 1/5th dose has been patented as a cognitive enhancer.

 

Phosphodiesterase inhibitor, ibudilast alleviates core behavioral and biochemical deficits in the prenatal valproic acid exposure model of autism spectrum disorder

 

Autism spectrum disorder (ASD) is categorized as a neurodevelopmental disorder, presenting with a variety of aetiological and phenotypical features. Ibudilast is known to produce beneficial effects in several neurological disorders including neuropathic pain, multiple sclerosis, etc. by displaying its neuroprotective and anti-inflammatory properties. Here, in our study, the pharmacological outcome of ibudilast administration was investigated in the prenatal valproic acid (VPA)-model of ASD in Wistar rats.

Methods

Autistic-like symptoms were induced in Wistar male pups of dams administered with Valproic acid (VPA) on embryonic day 12.5. VPA-exposed male pups were administered with two doses of ibudilast (5 and10 mg/kg) and all the groups were evaluated for behavioral parameters like social interaction, spatial memory/learning, anxiety, locomotor activity, and nociceptive threshold. Further, the possible neuroprotective effect of ibudilast was evaluated by assessing oxidative stress, neuroinflammation (IL-1β, TNF-α, IL-6, IL-10) in the hippocampus, % area of Glial fibrillary acidic protein (GFAP)-positive cells and neuronal damage in the cerebellum.


Key findings: Treatment with ibudilast significantly attenuated prenatal VPA exposure associated social interaction and spatial learning/memory deficits, anxiety, hyperactivity, and increased nociceptive threshold, and it decreased oxidative stress markers, pro-inflammatory markers (IL-1β, TNF-α, IL-6), and % area of GFAP-positive cells and restored neuronal damage.

Conclusions

Ibudilast treatment has restored crucial ASD-related behavioural abnormalities, potentially through neuroprotection. Therefore, benefits of ibudilast administration in animal models of ASD suggest that ibudilast may have therapeutic potential in the treatment of ASD.

 

 

I have also written widely about repurposing certain anti-parasite medicines to treat autism. This is not because I think parasites cause autism, it is the secondary modes of action.

 

 

Repurposing Niclosamide as a plausible neurotherapeutic in autism spectrum disorders, targeting mitochondrial dysfunction: a strong hypothesis

 

 

Autism Spectrum Disorders (ASD) are a complex set of neurodevelopmental manifestations which present in the form of social and communication deficits. Affecting a growing proportion of children worldwide, the exact pathogenesis of this disorder is not very well understood, and multiple signaling pathways have been implicated. Among them, the ERK/MAPK pathway is critical in a number of cellular processes, and the normal functioning of neuronal cells also depends on this cascade. As such, recent studies have increasingly focused on the impact this pathway has on the development of autistic symptoms. Improper ERK signaling is suspected to be involved in neurotoxicity, and the same might be implicated in autism spectrum disorders (ASD), through a variety of effects including mitochondrial dysfunction and oxidative stress. Niclosamide, an antihelminthic and anti-inflammatory agent, has shown potential in inhibiting this pathway, and countering the effects shown by its overactivity in inflammation. While it has previously been evaluated in other neurological disorders like Alzheimer’s Disease and Parkinson’s Disease, as well as various cancers by targeting ERK/MAPK, it’s efficacy in autism has not yet been evaluated. In this article, we attempt to discuss the potential role of the ERK/MAPK pathway in the pathogenesis of ASD, specifically through mitochondrial damage, before moving to the therapeutic potential of niclosamide in the disorder, mediated by the inhibition of this pathway and its detrimental effects of neuronal development.

 

Note that in earlier posts I explored RASopathies as potentially treatable types of intellectual disability (ID). We also have RAS-dependent cancers as a discrete treatable sub-type of cancer.


The ERK/MAPK pathway is known to interact with multiple genes that have been implicated in autism, and genome-wide association analysis of the same have supported these findings. As such, a dysregulation of this pathway has been found to result in many CNS disorders, including ASD-related syndromes, in many studies. These syndromes are collectively known as Rasopathies, due to the fact that the affected genes include those encoding for elements which function together with Ras, a G-protein responsible for activating ERKs (Levitt and Campbell 2009; Tidyman and Rauen 2009). It has been found that ASD is linked to the occurrence of many Rasopathies, and there have been multiple reports suggesting the possible relation of ERK/MAPK pathway defects with the incidence of ASD (Vithayathil et al. 2018; Aluko et al. 2021)⁠⁠. Moreover, a detailed study has found that single nucleotide polymorphisms (SNPs) in the ERK/MAPK-related genes are more common in subjects presenting with idiopathic ASD.

 

Niclosamide is an FDA-approved antihelminthic drug which is routinely used to treat tapeworm infections by inhibiting their mitochondrial oxidative phosphorylation and ATP production. In addition, it has long been known to have significant immunomodulating activity, and has been shown to inhibit a number of signaling pathways, including the Wingless-related integration site (Wnt)/β-catenin, nuclear factor kappa B (Nf-κB), signal transducer and activator of transcription 3 (STAT3), and mammalian target of rapamycin (mTOR) (Chen et al. 2018). However, while these targets are known to be rather well-characterized in terms of the effect that niclosamide has on them, there are also other targets, including the phosphoinositode 3 kinase/Akt (PI3K/Akt) and ERK/MAPK pathways, that are seen to be downregulated by the agent. Hence, given the possible relation of the ERK pathway in autism, there has been interest in the potential role of niclosamide in the management of the prognosis of ASD. This article aims to discuss the possible therapeutic benefit of niclosamide in the treatment of autism spectrum disorders.

 

Now I know that parents like the idea of treating autism with various gadgets you can strap on to your head  things like Transcranial Magnetic Stimulation (TMS). I must say I liked my old post on Photobiomodulation/cold laser/low level laser therapy.


Epiphany: Low Level Laser Therapy (LLLT) for Autism – seems to work in Havana


From China we have a new round-up paper, but the full text does not yet seem to be ready.

 

Non-invasive brain stimulation for Patient with Autism A Systematic Review and Meta-Analysis

Objective: To comprehensively evaluate the efficacy of non-invasive brain stimulation (NIBS) in patients with autism spectrum disorder (ASD) in randomized controlled trials (RCT),providing reference for future research on the same topic.

Methods:Five databases were searched (Pubmed,Web of science,Medline,Embase and Cochrane library) and track relevant references,Meta-analysis was performed using RevMan 5.3 software.

Results: Twenty-two references(829 participants) were included. The results of meta analysis showed that, NIBS had positive effects on repetitive and stereotypical behaviors, cognitive function and executive function in autistic patients. Most of the included studies had a moderate to high risk of bias, Mainly because of the lack of blinding of subjects and assessors to treatment assignment, as well as the lack of continuous observation of treatment effects.

Conclusions: Available evidence supports an improvement in some aspects of NIBS in patients with ASD. However, due to the quality of the original studies and significant publication bias, these evidences must be treated with caution. Further large multicenter randomized double-blind controlled trials and appropriate follow-up observations are needed to further evaluate the specific efficacy of NIBS in patients with ASD.


Unfortunately, the Chinese have concluded that most of these studies are not reliable. So no laser for me to go out and buy just yet.

No need to dent your bank balance with the next therapy.  We are back to one of the world's most prescribed and therefore affordable drugs, its Simvastatin (Zocor). 

There is masses of information in this blog about the potential to treat sub-types of autism with Atorvastatin, Simvastatin or Lovastatin. They are each slightly different.

 

Effect of simvastatin on brain-derived neurotrophic factor (BDNF)/TrkB pathway in hippocampus of autism rat model 

Purpose: To study the effect of simvastatin on behavioral performance in a rat model of autism, and its effect on hippocampal brain-derived BDNF-TrkB pathway. 

Methods: Twelve rats with valproic acid (VPA)-induced autism were randomly divided into model group and simvastatin group, while six healthy rats served as normal control group. Rats in the simvastatin group received the drug (5 mg/kg) via i.p. route, while rats in model group and normal control group were injected with equivalent volume of normal saline in place of simvastatin. Capacity for interaction and repetitive stereotyped behavior, as well as results of Morris water maze test were determined for each group. The expressions of BDNF-TrkB proteins were assayed with immunoblotting. 

Results: The frequencies of sniffing normal saline, alcohol and rat urine were significantly higher in model and simvastatin rats than in normal rats, but they were significantly lower in simvastatin-treated rats than in model rats (p < 0.05). There was higher duration of turning, jumping and grooming in the model group and simvastatin group than in the normal rats, but the duration was significantly reduced in simvastatin rats, relative to model rats. Escape latency times was significantly longer in model and simvastatin rats than in controls, but number of target quadrant crossings was significantly reduced. However, escape latency time was lower in simvastatin rats than in model rats, but number of target quadrant crossings was significantly higher. The model and simvastatin rats had down-regulated levels of BDNF and TrkB protein, relative to control rats, but there were markedly higher levels of these proteins in simvastatin-treated rats than in model rats. 

Conclusion: Simvastatin improves the behavioral performance of autistic rats by regulating BDNF/TrkB signal axis. This finding may be useful in the development of new drugs for treating autism.

  

Conclusion

What is the conclusion? Well, I could say give up reading the new research and just read my old posts.  It seems you are not going to miss very much.

Of course, back in the real world, it is true that things do take time to change and after a few decades the leap might be taken from the research to the doctor’s office.

There already is plenty of research on the causes of autism and what steps can be taken by those who want to treat aspects of it.  It is far from a complete picture, but it is enough to get started.  There are no guarantees of success, but if you want 100% certainty you will wait forever.








Thursday 19 October 2017

Unstable Blood Flow in Autistic Brains?





Today’s post is complicated, but may be of interest to those people interested in Nitric Oxide therapies (Agmatine, Cocoa Flavanols, Beetroot, Taurine, Citrulline etc) and those who think they are treating earlier hypoxia/ischemia.
As usual, I am making simplifications, but the science behind the general ideas already exists. When it comes to the details regarding VEGF and autism, there are big gaps in the science. 
We have already seen that something as simple as improving blood flow appears to be therapeutic in some people with autism. Perhaps there should even be a post called “cold feet and autism”. 
One reader of this blog, Seth, has commented before that he sees autism as essentially vascular in nature.  Today’s research suggests it does indeed include microvascular abnormalities.
Rather than simply reduced blood flow, the problem, in at least some autism, appears to be unstable blood flow, which is much more complex.
I do take a leap in logic to suggest that this is likely linked to the known abnormalities in Vascular Endothelial Growth Factor (VEGF) and in VEGF receptor 1 (VEGFR-1).  It also appears that the VEGF anomalies that lead to angiogenesis may be part of the reason for the increased prevalence of chronic inflammatory diseases including asthma, atopic dermatitis, psoriasis, and rheumatoid arthritis.
Ideally you might want to normalize VEGF, even later in life. The use of anti-angiogenic drugs has been suggested.  Angiogenesis inhibitors were once seen as potential wonder drugs to treat cancer.
It does seem that just simply targeting vascular resistance is helpful for some people with autism.   
VEGF is regulated by many things, some are highly complex and are usually studied with regard to cancer, like Wnt signaling and Ras. Recall that both Wnt and Ras are relevant to autism. One simple thing that influences VEGF is nitric oxide (NO), but it is not a simple relationship. As highlighted by our reader Tyler, intermittent fasting (IF) can also be used to increase VEGF. Research suggests that intermittent fasting (IF) is actually a simple but potent tool to both prevent and treat metabolic disorders, including but not limited to type 2 diabetes.


In the case of autism, where both VEGF and NO are likely to be low, it does seem quite likely that by increasing the production of NO you will increase the expression of VEGF. So the amino acid L-citrulline is likely to increase VEGF.
In the rat study below, L-citrulline increased eNOS and VEGF; we presume NO also increased. 


Blood Flow in Autistic Brains
Now we get to the autism-specific research.


A team of scientists has found evidence that people with autism have unstable vessels in the brain which prevents the proper delivery of blood flow, according to research published in the Journal of Autism and Developmental Disorders
“In a typical brain, blood vessels are stable, thereby ensuring a stable distribution of blood,” said Patricia Whitaker-Azmitia, PhD, professor in the Department of Psychology and director of the Graduate Program in Integrative Neurosciences at Stony Brook University, N.Y.,  in a statement. “Whereas in the autism brain, the cellular structure of blood vessels continually fluctuates, which results in circulation that is fluctuating and, ultimately, neurologically limiting.”



Sustained angiogenesis may contribute to prolonged neuroplasticity in the ASD brain. We propose the sustained splitting angiogenesis is a necessary component to maintain the heightened neuronal activity reported in ASD patients. Many biological and functional indicators are increased in ASD including cerebral metabolic rate, regional synchronous electrical activity sensitivity to sound; cortical activity in deactivation centers at rest, low-level visuospatial processing, visual-tactile interactions; attention to low-level perceptual information and over-connected, redundant cortical networks. It can be suggested that sustained rearrangement of microvasculature permits excessive shorter and local connections to be maintained and prevents the growth of longer and more complex brain connections required for language and social interactions. Use of anti-angiogenic drugs may provide a novel treatment strategy for reducing neuronal activity in ASD patients by inhibiting vascular plasticity.








Brain tissue from children (left) and adults (right) with autism (top) but not controls (bottom) shows dividing cells lining blood vessels.


Angiogenesis and Lymphangiogenesis
It looks like, at least in today’s subgroup of autism, we want less angiogenesis but more lymphangiogenesis.  The ideal way to do this is via VEGF/VEGFRs.
Here it may be helpful to explain the meaning of some new terminology.

Angiogenesis is the physiological process through which new blood vessels form from pre-existing vessels
Angiogenesis is a normal and vital process in growth and development, as well as in wound healing and in the formation of granulation tissue. However, it is also a fundamental step in the transition of tumors from a benign state to a malignant one, leading to the use of angiogenesis inhibitors in the treatment of cancer.”
Lymphangiogenesis is the formation of lymphatic vessels from pre-existing lymphatic vessels in a method believed to be similar to angiogenesis (blood vessel development).

Lymphangiogenesis plays an important physiological role in homeostasis, metabolism and immunity. Impaired or excessive lymphatic vessel formation has been implicated in a number of pathological conditions including neoplasm metastasis, oedema, rheumatoid arthritis, psoriasis, lymphangiomatosis and impaired wound healing.”


Lymphatic system and the Brain 
As highlighted recently by our reader Tanya, a pretty basic gap in science’s understanding of how the brain works has just been addressed. It is all about where do the waste products produced in the brain go to.
Scientists have found evidence that the brain is connected to body’s central lymphatic system.
This then begs the question of what happens when this system does not work well. Is this a feature of some neurological disease? If that were the case, it would likely be associated with reduced lymphangiogenesis.

Running through your body is a network of channels and junctions called the lymphatic system, which siphons off waste and fluids like a biological sewer.
It was long thought the brain was excluded from this web of anatomical plumbing. After being spotted in mice brains two years ago, researchers have now confirmed the presence of lymphatic vessels in human brains, fueling speculation over the kinds of diseases they might be responsible for.




VEGF and VEGF receptors 
There are four types of VEGF and they act through three types of receptors. Confusingly, the receptors have been given multiple names.


In severe autism there is reduced VEGF, but we do not know which type(s) but there is increased expression of the receptor  VEGFR-1 also known as Flt-1. VEGFR-2 expression is normal, this is the best understood receptor.

This receptor VEGFR-1 is activated by VEGF-A and VEGF-B.  

Objective:

To study vascular endothelial growth factor (VEGF) and its soluble receptors sVEGFR-1 and -2 in autism.

Design and methods:

We measured serum levels of angiogenic molecules in 22 patients with severe autism and 28 controls.

Results:

Patients and controls had similar sVEGFR-2 levels, but VEGF levels were lower and sVEGFR-1 higher in patients with autism.

Conclusion:

The imbalance between VEGF and its receptor sVEGFR-1 may be involved in the pathophysiology of autism.


Hypoxia related autism 
It is well known that hypoxia-ischemia insults early in life can cause cognitive dysfunction and likely autism.  In the very recent paper below, it is suggested that altered VEGF signaling is the mechanism that causes the damage to the brain. 

Neurovascular dysfunction and the role of vascular endothelial growth factor (VEGF) have been explored in neurodevelopmental disorders including schizophrenia, bipolar disorder, major depressive and mood disorders, and autism. These disorders are correlated with hypoxia-ischemia insults during early life and are strongly associated with cognitive dysfunction. This review focuses on the hypoxia-regulated protein, VEGF, to discuss its crucial roles in brain development and function. These data implicate that alterations to VEGF signaling during early life can impair neural development, underlying the severe cognitive deficits observed in neurodevelopmental disorders.
Recent Findings
VEGF has been linked to neurological processes that influence learning and memory. VEGF is advancing towards being a novel biomarker and possible therapeutic for neurological disorders. Prenatal environmental enrichment positively impacted neurotrophic factors, brain structure, and memory in rodent models.
Summary
Understanding the molecular mechanisms of VEGF in neurodevelopment will create intervention strategies for at-risk children born to adverse early-life events. By proactively working with those in a pliable neurodevelopmental state, we hope to ameliorate cognitive deficits to increase their chance to develop into high-functioning adults with disabilities. 

Hypoxia-Induced Angiogenesis - Good and Evil


Hypoxia promotes vessel growth by upregulating multiple pro-angiogenic pathways that mediate key aspects of endothelial, stromal, and vascular support cell biology. Interestingly, recent studies show that hypoxia influences additional aspects of angiogenesis, including vessel patterning, maturation, and function.
VEGF, considered a master regulator of angiogenesis in its own right, causes endothelial cells to detach from the parent vessel and migrate into the neighboring stroma. Hypoxia is the principal regulator of VEGF expression, as it is a direct transcriptional target of both HIF-1α and HIF-2α.



Allergy and inflammation resulting from angiogenesis 
It appears that in some people another consequence of too much angiogenesis is allergy and other inflammatory disease; these are of course often comorbid with autism.  This suggests anti-angiogenic and pro-lymphangiogenic therapies.


Angiogenesis and lymphangiogenesis, the growth of new vessels from preexisting ones, have received increasing interest due to their role in tumor growth and metastatic spread. However, vascular remodeling, associated with vascular hyperpermeability, is also a key feature of many chronic inflammatory diseases including asthma, atopic dermatitis, psoriasis, and rheumatoid arthritis. The major drivers of angiogenesis and lymphangiogenesis are vascular endothelial growth factor- (VEGF-)A and VEGF-C, activating specific VEGF receptors on the lymphatic and blood vascular endothelium. Recent experimental studies found potent anti-inflammatory responses after targeted inhibition of activated blood vessels in models of chronic inflammatory diseases. Importantly, our recent results indicate that specific activation of lymphatic vessels reduces both acute and chronic skin inflammation. Thus, antiangiogenic and prolymphangiogenic therapies might represent a new approach to treat chronic inflammatory disorders, including those due to chronic allergic inflammation.



Figure 1: VEGF-binding properties and distinct VEGF receptor expression on lymphatic and blood vascular endothelium. VEGFs bind to the three VEGF receptor tyrosine kinases, leading to the formation of VEGFR dimers. Blood vascular endothelial cells express VEGFR-1 and VEGFR-2, whereas lymphatic endothelial cells express VEGFR-2 and VEGFR-3. VEGF-A—which binds both VEGFR-1 and VEGFR-2—can directly induce blood and lymphatic vascular remodeling. VEGF-C and -D bind VEGFR-3 and, after proteolytic processing, also VEGFR-2, thus inducing angiogenesis and lymphangiogenesis.


There is clear evidence that in humans, vascular remodeling occurs in many chronic inflammatory disorders. Even though different anti-inflammatory drugs are on the market, there is no specific therapy that interferes with the pathological vascular changes that occur during inflammation. Angiogenesis and lymphangiogenesis are tightly linked to chronic inflammation, and targeting the blood vessels and lymphatic vessels has been shown to be an effective strategy in different experimental mouse models of chronic inflammation. One has to keep in mind, however, that in most conditions the vascular activation likely represents a downstream event that maintains the inflammatory process, but not the pathogenetic cause of the respective disease, which often has remained unknown. Nonetheless, antiangiogenic and prolymphangiogenic therapies might represent new approaches to treat chronic inflammatory disorders, including those due to chronic allergic inflammation.


Conclusion
I did start this post by saying this subject is complicated.
From the previous post on nitric oxide, it looked like L-citrulline, L-norvaline, Agmatine and other NO increasing substances could be therapeutic. Cold hands and feet seem to be very common in autism.
It seems likely that the NO increasing therapies will likely also increase VEGF, which I think is a good thing.
From today’s post we see that rather than just a single VEGF we have five broad types (A,B,C, D and PIGF), but even just VEGF-A has various different forms. We do not have detailed research on autism and specific subtypes of VEGF. 
We have the four different VEGF receptors and we know VEGFR-1 is over expressed. We do not have a clever way to counter this. More VEGFR-3 expression would be helpful and that is again a case of changing the balance between inflammatory cytokines, which as we know is usually disturbed in autism.
The inflammatory cytokine IL-6 induces VEGF-C production which leads to both angiogenesis and lymphangiogenesis; this is why people with cancer and high IL-6 may have a poor prognosis.
Regarding VEGF and autism we clearly lack 95% of the science. Strange things are afoot and we are just guessing.
For the time being, I see increasing vascular permeability via eNOS as therapeutic, even though today’s post suggests that antiangiogenic therapies could be helpful, which may seem contradictory.
The kind of drugs that would reduce the activity of VEGFR-1/Flt-1 would be very expensive cancer drugs.  Hypoxia also downregulates VEGFR-1/Flt-1.
Inflammatory cytokines regulate VEGFR-3/Flt-4 and hence control of lymphangiogenesis.  Interferon gamma (IFNγ) upregulates VEGFR-3/Flt-4, while Interleukin 1 beta (IL1β) down regulates it. 
So more IFNγ and less IL1β might help.
Although expensive, interferon gamma (IFNγ) has been shown to be effective in treating severe atopic dermatitis. This would make sense since it induces lymphangiogenesis and the research suggests this should improve inflammatory disease.


CONCLUSIONS:


We conclude that rIFN-gamma appears to be a safe long-term therapy for patients with severe atopic dermatitis.



So perhaps interferon-gamma (IFNγ) for some autism? Quite possibly, just look for the ones with asthma, atopic dermatitis, psoriasis or juvenile arthritis.