Showing posts with label NNZ-2566. Show all posts
Showing posts with label NNZ-2566. Show all posts

Wednesday 21 September 2022

Pentoxifylline and cGP (an IGF-1 normalizer) from Blackcurrants, for Autism?



Readers may be wondering at what point Peter will run out of things to write about.  I do sometimes wonder the same thing. I was going to also write about Loperamide (Imodium), but the post would have been too long. Next time!


Pentoxifylline has been in use to treat autism for 50 years. The original studies did suggest its effect was greatest among small children.  I have been in some discussions with a US psychiatrist, Dr Powell, who is a big fan of the off-label use of this drug to affect the brain in adults.  He has even written a book on the subject.

My previous posts on Pentoxifylline can be found here:

Dr Powell’s patients with autism tend to be older children, not the toddlers who did well in clinical trials in Japan in the 1970s.  He sees significant improvement in many, but not all, of his patients with autism.  The parents report improved social interactions and having higher-level discussions with their child.

What is notable is that he uses frequent dosing, 4 times a day, always after food to avoid the GI side effects.

Pentoxifylline is inexpensive, but its effect does not last long, hence the frequent dosing.  Some people take taking this drug 5-6 times a day.

Pentoxifylline has multiple modes of action, it should increase blood flow to the brain and it is broadly anti-inflammatory.  It is a non-selective PDE inhibitor, normally used treat muscle pain in people with peripheral artery disease. It increases red blood cell flexibility and it reduces the viscosity of blood.

There are PDEs 1 to 11. It all gets quite complicated, for example PDE1 subtype A2 has a potential role in neurodegenerative diseases, including:

·        Parkinson's disease

·        Axonal neurofilament degradation

·        Motorneuronal degradation

·        Neuronal ischemia

·        Alzheimer's disease

·        Epilepsy

Recall that PDE4 inhibitors are used to treat asthma and COPD. We can potentially repurpose those to improve myelination in MS, or autism, and at specific low doses they can improve cognition.


cGP (from Black Currants)

I did write quite a lot in this blog about growth factors and autism.  The familiar ones are BDNF, NGF and IGF-1, but there are many more. 

My previous posts on IGF-1 can be found here:

We know that growth signaling in autism is disturbed, but it is not simple.  As the disease progresses (the fetus develops, the baby is born and grows into a toddler) the imbalance in growth signaling changes.  This means that what would be helpful in a 6 month old baby might well be inappropriate in a 6 year old.  This is a good example of what I call the what, when and where of treating autism. Here it is the “when” that matters.

Some people lack BDNF while others have too much. Very possibly, this changes over time in the same child.

One possible therapy for autism is injections of IGF-1 (Insulin-like Growth Factor 1).  IGF-1 plays an important role in childhood growth.

A synthetic analog of IGF-1 is used in children for the treatment of growth failure.  This drug called Mecasermin was used in autism trials and in Rett syndrome trials.

In Rett syndrome the search has been on for an oral therapy.

Trofinetide (NNZ-2566) is a potential therapy for Rett syndrome being developed by Neuren Pharmaceuticals in Australia.

Trofinetide is derived from IGF-1.

Trofinetide got to phase 2 trials as a therapy for Fragile-X in 2015.

The second product in development at Neuren is NNZ-2591.  It is aimed at normalizing the level of IGF-1.

This is in the pipeline to treat:

  • Phelan-McDermid syndrome (Shank3 gene and others not working)
  • Angelman syndrome (UBE3A gene not working)
  • Pitt Hopkins syndrome (TCF4 gene not working)
  • Prader-Willi syndrome (MAGEL2 gene and others not working)


What is NNZ-2591?

It is an analogue (modified version) of cyclic glycine proline (cGP)

Cyclic glycine-proline (cGP), a metabolite of IGF-1, is neuroprotective through improving IGF-1 function.

There is also research focused on Parkinson’s and Alzheimer’s where it seems that cGP is reduced.

In New Zealand they found that supplementation of Blackcurrant anthocyanins (pigments) increased cGP in the spinal fluid of patients with Parkinson’s.

This also led the way to the idea of increasing cGP as means of protecting the brain during aging. There is now a commercial OTC product in New Zealand to do just this.

Our reader Daniel, who has a daughter with Rett syndrome, is assessing the benefit of cGP, using the OTC product cGPMAX. The results so far are promising.

Rett is very specific because we know for sure that IGF-1 and NGF are disturbed.

Is cGP going to be beneficial in broader autism?  May be yes, but we come back to the what, when and where.  It may well depend on when a specific person takes it.  We have both hypoactive pro-growth signalling autism and hyperactive pro-growth signalling autism.



Unfortunately, what the clever researchers who came up with the above concept did not consider is that you may start out hyper in the womb and switch to hypo a few short years later.



Frequently dosed Pentoxifylline looks like a potentially interesting therapy for many with autism, including some with high IQ.  Take note our Aspie readers.

Daniel’s idea to look at the Neuren’s non-Rett therapy as a Rett therapy is interesting.  In effect you do not need to wait for the Australian drug, you can hop across the Tasman Sea to New Zealand and use their cGP supplement, developed for protection against dementia.

You would also think that parents of children with:

  • Phelan-McDermid syndrome (Shank3 gene and others not working)
  • Angelman syndrome (UBE3A) gene not working)
  • Pitt Hopkins syndrome (TCF4 gene not working)
  • Prader-Willi syndrome (MAGEL2 gene and others not working)

might want to follow Daniel’s lead.

As you can see, there is a lot of trial and error in science.  Back in 2009 NNZ-2566 was in clinical trials for the treatment of cognitive deficits following traumatic brain injury.  That must not have worked out.  Fragile-X did not work out and now it is phase 3 for Rett girls, which seems to be going well.


IGF-1 for old people

The same growth factor IGF-1 that is key during development also plays a key role in aging. Dr Jian Guan made a world first discovery. She discovered that cGP (cyclic Glycine-Proline) was responsible for controlling the IGF-1 hormone in our body. Thus by increasing the level of cGP in our body, the cGP will essentially command the IGF-1 to build more blood vessels.

Dr Jian Guan, was then recognised as the world-wide authority on cGP. In 2017 she discovered that New Zealand blackcurrants contained high volumes of natural cGP which could regulate optimum levels of IGF-1 in the body.

So now we have Antipodeans/Kiwis fending off dementia, and potentially metabolic syndrome, by taking their locally made cGPMax.

Will it help you case of autism? Who knows, but if it does not, just give the leftover pills to Grandma, Granddad or take them yourself!


All the supporting papers from New Zealand.


Thursday 28 April 2016

Intranasal Insulin for Some Autism vs IGF-1 and NNZ-2566


Very often the simplest solutions are the best and very often, when fault finding a problem, people overlook the obvious.  

I seem to be forever having to mend things and I find this all the time.

Back in 2013, when I knew much less about autism, I wrote about the experimental use of insulin like growth factor 1 (IGF-1) in autism.  

It’s a Small World – IGF-1 and NNZ-2566 in Autism

It turned out that in autism the many different growth factors can be disturbed (too much, or too little) and this variation does indeed define some specific types of autism.  For example in Rett Syndrome there are very low levels of Nerve Growth Factor (NGF); low levels of NGF in some older people is the cause of their dementia.  In more common types of autism NGF is actually elevated.

IGF-1 is very well studied.


IGF-1 is a primary mediator of the effects of growth hormone (GH). 

Growth hormone is made in the anterior pituitary gland, is released into the blood stream, and then stimulates the liver to produce IGF-1. IGF-1 then stimulates systemic body growth, and has growth-promoting effects on almost every cell in the body, especially skeletal muscle, cartilage, bone, liver,kidney, nerves, skin, hematopoietic cell, and lungs. This would explain why adults abusing GH may end up needing hip and knee replacements.

Before getting into the science, IGF-1 has long been available as a drug to treat children with growth delays.  In the US this drug is being used on children with a type of autism called Phelan-McDermid Syndrome.

Now, regular readers will recall from my last post on intranasal insulin that it was in this very syndrome that there was a successful intranasal insulin.

So most likely without delving into the science at all it looks like IGF-1 and intranasal insulin are both options to treat the same dysfunction.

Using IGF-1

Using Intranasal Insulin

Intranasal insulin to improve developmental delay in children with 22q13 deletion syndrome: an exploratory clinical trial.


This is an Australian drug that is a modified version of IGF-1 (a so called analog).  They modified it so that it can be taken orally rather than by injection.  The developer has a very thorough presentation showing why they think it should be effective in autism.  


The Science

The first thing to note is that insulin and IGF-1 act as messengers.  Disruption in growth factor signaling can have serious consequences.

Insulin and IGF-1 both activate the same insulin receptor (IR).

Most people think that insulin is a just a hormone produced in their pancreas that regulates the amount of glucose (sugar) in their blood.  It does of course do that, but it actually does much more.


Insulin receptors are expressed all over the body including the brain.

Here is a relatively simple presentation explaining the role of insulin signaling in the brain:-

Now for the diehard scientists among you that have been reading about all those signaling pathways that lie behind autism, cancer and many other hard to treat conditions, look at the graphic below.

We know the importance of RAS.  Impaired RAS signaling underlies the RASopathies, one feature of which is cognitive loss (MR/ID), another is autism.

We also know the importance of Akt (PKB/protein kinase B) in some types of autism.  PTEN appears again.

So irrespective of an undoubtedly important effect on glucose and insulin resistance, we should expect activation of insulin receptors in the brain, in some types of autism, to have a further positive effect.

It would seem to be a potential therapy for RASopathies.

As is often the case, there are extreme dysfunctions of RAS and I suggest there are more mild dysfunctions.

I suggest that some people with autism and some cognitive dysfunction have a partial RASopathy.

Since autism contains both extremes of many dysfunctions, there will undoubtedly be types of autism that respond negatively, or not at all, to activation of insulin receptors in the brain.


Nobody likes injections and that is necessary to give IGF-1.

NNZ-2566 is an experimental autism drug and on past performance that means it will take decades to reach the market, if ever.

That leaves insulin which was sitting all along in your local pharmacy.

Intranasal insulin was once investigated for use in diabetics, but it did not work.  It is not absorbed into the blood stream.

This is of course the huge advantage for people with autism, since we only want to activate the insulin receptors in the brain.  If you are not diabetic why would you want to have any effects in the rest of the body?

Indeed there are known major side effects of injecting IGF-1 or GH (growth hormone) into adults.  All kinds of things start growing and this can lead to terrible results.

The fact that all the studies show that intranasal insulin does not enter the blood stream and so lower blood glucose levels, makes it a much better drug for autism than IGF-1 or indeed NNZ-2566.


There are various types of insulin and the main difference is that some are modified to be longer acting.

The basic insulin is soluble or clear insulin, and nowadays is synthetic rather than derived from pigs.  Examples include Humulin Regular/R/S by Lilly.

The standard concentration is 100 IU/ml.

The trials in Alzheimer’s and other conditions varied in dosage but generally used about 20 to 40 IU per day.

This is not a trivial dose.  If injected, rather than inhaled, that dose would have a significant effect on lowering blood sugar and would be dangerous.

My antihistamine nasal spray gives a metered dose of 0.14 ml.

So without any dilution, if filled with off the shelf insulin it would dispense 14 IU per spray.

So no special high tech drugs, dilutants/diluents or dispensers appear to be necessary. Some trials do use fancy inhalers, like the one in the video at the end of this post.

To be prudent it might be wise to dilute the insulin so as to gradually increase the dose.  Maybe in some people the nasal membrane is more permeable than in others.  Some of the trials did this, but most did not.

A fridge is required, because insulin needs to be kept chilled.

I do wonder why nobody seems to be researching this in autism.  Silly point, as one insulin researcher commented on the earlier post; there is no big money to be made, hence no interest.

Insulin & Alzheimer’s

The reasons that intranasal insulin improves Alzheimer’s, and likely will Down Syndrome, may differ to those help in (some) autism.

Beta amyloid is key to Alzheimer’s (and early onset Alzheimer’s in Down Syndrome) but is not a known issue in autism.  Central insulin resistance is an issue in Alzheimer’s and might well be in autism.  

Perhaps people with mitochondrial dysfunction (an energy conversion dysfunction) might particularly benefit from increased glucose uptake in the brain.  It appears that mitochondrial dysfunction plays a role in insulin resistance. 

Role of Mitochondrial Dysfunction in Insulin Resistance

The activation of the RAS pathway might be highly beneficial to some people with autism.  

Here is a good film, which refers to the studies from previous posts and shows the effect on one man with Alzheimer's. 

 You also see their fancy inhaler device.

Friday 17 January 2014

Increasing Good Behaviors and Reducing Bad Behaviors in Autism

This blog is all about clever chemicals that can make life better for people with autism, but for several years I have also been learning all about behavioral therapy to achieve the same goal.  So I thought I should look for any lessons that I might apply from my earlier endeavours.  

Two of the best books in my ABA collection, based on feedback from all of our Assistants/Therapists/Friends are the oldest, and indeed the lightest.  They are more than 30 years old, as you might imagine from the front cover, which is a big turn off for many parents.

They are great books, that tell you what you actually want to know: how to get rid of horrible behaviours and how to encourage nice ones.
Dr Foxx is still going strong and won the 2013 Award for Distinguished Professional Contributions to Applied Research from the American Psychological Association. Foxx is a professor of psychology at Pennsylvania State Harrisburg and an adjunct professor of pediatrics at the Pennsylvania State University College of Medicine.

The thing I always found odd was why Dr. Foxx wrote two separate books, surely it is all the same subject matter.  He had his reasons.
Here is my parallel with my quest to develop a smart combination of safe drugs to help in autism. 

So far, most of what I have been doing is focused on decreasing the bad behaviors, so the blue part of the pill; the remaining work is find to ways to promote the good behaviors, the yellow part of the pill.

This might actually be more relevant that you realize.  While it is clear that bad behaviors in autism vary widely in both type and extent, desirable good behaviors should have much more in common.  We know that many individual drugs on the "blue side" are effective only in a minority of people, but perhaps there will be much more commonality on the "yellow side".  I expect this to be the case.
So my Polypill is taking colour, as well as shape.

Another good piece of news is that I found a precedent for orphan drug designation in classic autism.  It appears that in 1998 the FDA awarded orphan drug status to Naltrexone to treat childhood autism with SIB.  In the US, orphan drug status is only possible for rare diseases affecting less than 200,000 people.  There are other cases of orphan drugs in autism, but they are for rare genetic variants. Currently the FDA website for orphan drugs does not list Autism for Naltrexone.
Also, an interesting Australian drug NNZ-2566,  mentioned in a previous post, has recently been given orphan drug status in the US, this time based on Fragile X designation.  The drug is an analogue of IGF-1 and looks interesting to me.

If you want to see what orphan drug designation in the EU means, here is what Novartis received for its new Fragile X treatment, Mavoglurant.
Orphan drug status reduces the cost of approving a drug.  But how rare is classic autism, these days?


Thursday 5 December 2013

Autism Phenotypes

Hardly a week goes by without somebody mentioning to me a wonder treatment or even “cure” for autism; the latest one being the GAPS diet.

I think all such reports are worthy of investigation, but many lead to nowhere.

Why is this?

·       Medical science has failed to adequately define autism, so we are not all talking about the same autism

·        Many people putting forward theories have not read even the most basic (and not contested) autism research.  Some are even, apparently, qualified “doctors”.
Autism Phenotypes

What is not disputed is that autism has many sub-types (phenotypes). Researchers tell us 10-20% of cases referred to as autism have a known genetic defect (Fragile X, SLOS, Timothy syndrome etc.).  80% do not have a known genetic marker/cause.

Autism can be subdivided into regressive (when a child loses speech and other learnt skills) and non-regressive (early onset).  Even this can be a subjective judgment, since it effectively relies on parents to determine it, after the event.
Then you have cases of autism which clearly have nothing to do with Kanner’s classic version.  In this blog I showed how even cerebral malaria in a child can lead to the onset of autism.  This clearly is a case of brain damage caused by malaria; but to the observer, months later, it would probably be classed as regressive autism or childhood disintegrative disorder.
Testing for Autism
Researchers and doctors keep repeating that there is no test for autism.  This is not strictly true, but it does explain why so many different conditions are all lumped together as “autism”.

In fact, if you read the research closely, you will see that there are many tests for autism; although they may not be perfect.
The only way to know for sure that it is genuine autism is to examine the brain itself.  The only way to do this 100% accurately is via post-mortem analysis of the brain.  Recently, non-invasive methods have been developed to confirm the same findings of brain malformation that occurred prior to birth.

So the kind of autism that relates to tissue held in brain banks is best understood.  But what kind of autism would that be?  Well, it refers mainly to children and young adults who died prematurely.  They died from things like seizures or drowning.  What does that tell us?  This tells us that these people were most likely severely affected by autism.  The mild, social difficulties, type of autism is, fortunately, hardly likely to make it to the brain tissue bank.
If the person interpreting the MRI of a child’s brain knows what to look for, they may very well be able to identify this type of autism.  The expert here is Eric Courchesne.
A similar approach can followed using Electroencephalography (EEG) to identify autism; but it would be smart to cross check this with Eric.

Regressive vs. Early-Onset
Then you have the difference between regressive and non-regressive autism.  Here again, from my Dean’s List of researchers, we look at Paul Ashwood’s research to see that kids with regressive autism have HIGHER levels of inflammatory markers in their blood.  These include cytokines like interleukin 6, which can be inexpensively measured in most laboratories.  This tells us that perhaps regressive autism is an entirely different condition from non-regressive/early onset autism.  As I would expect, increasing cytokine levels were associated with more impaired communication and aberrant behaviors. 
Lab Testing
We have seen earlier in this blog that some very expensive lab tests exist for autism, but their usefulness and integrity is highly disputed.  There are, of course, many hundreds of other tests that are entirely validated by medical science.  Many of these tests are cheap and available all over the world.

Hormonal Screening
We know from the research that about 30% of people with autism have high blood serotonin. A standard lab test is required.
We know that many have high levels of insulin-like growth factor (IGF-1).  A standard lab test is required.
Thyroid hormone levels and in particular a blunted response of TSH to TRH (i.e. central hypothyroidism) can help define further phenotypes.

The TRH test is now not widely used, but TSH, FT3 and FT4 are cheap tests.
Growth Hormone (GH) is also implicated in autism, along with IGF-1; there is a lab test to measure pituitaryfunction to see how well GH is being produced.

By screening for hormonal dysfunction, it would be possible to identify phenotypes that would most likely benefit from therapies targeting those defects, like NNZ-25266.

Pancreatic Dysfunction
It is reported by Joan Fallon, of Curemark, that 50+% of kids diagnosed with “US autism” seem to have a pancreatic dysfunction.  This can be tested for by measuring fecal chymotrypsin level.  The test measures how well your pancreas is working, and is a standard test for people with cystic fibrosis.  Since the US diagnoses far more kids with autism than other countries, it seems highly plausible that “US autism” includes many more phenotypes than, say, “French autism”.

I was quoted about $8 for a chymotrypsin test.

Ion-Channel Diseases (Channelopathies)
Many diseases like Parkinson’s disease, Spinocerebellar Ataxia and Timothy Syndrome are caused by faulty calcium ion-channels.

The Bumetanide autism therapy, undergoing trials in Europe, is based on another channelopathy, this time a faulty chloride transporter NKCC1.
It is clear from reports I have received, that Bumetanide therapy is totally ineffective in some children with ASD, but in other children, like my son, it is effective.
So some types of autism have certain channelopathies and other types have different ones or, quite possibly, none at all.  

My conclusion today is pure conjecture.  I imagine that possibly as few as a quarter of cases of “US autism” are actually “real” autism, that is with all the brain damage/malformation that is identified in those post mortem brain studies and which forms the basis of 90% of autism research.

The other three quarters may be something entirely different, just like the case of the mosquito that bit the child, produced cerebral malaria and then later the full symptoms of autism.  Within the three quarters may be food allergies, digestive enzyme deficiencies, gut disorders, mastocytosis, blood brain barrier defects, undefined calcium ion-channel diseases etc.
This would account for those occasional amazing “recoveries” and the apparent success, in some cases, of diets like GAPS.  Sadly, diet is unlikely to 100% fix brain damage.  If you are lucky enough to totally “recover”, you cannot have had brain damage in the first place.  It is evident that in some phenotypes of autism, diet can reduce autistic behaviours.  This can only be proved in trials, if biomarkers are established for that specific phenotype.
Most likely the only biological thing all these “autisms” have in common is oxidative stress and neuroinflammation; but only a non-medical scientist, like me, can say such a thing.



Monday 11 November 2013

Creatine, the Sub-types of Autism is Affects, and the Missing $26 million

Poly Genetic Theory of Autism

Autism appears to be the result of the expression of multiple abnormal genes acting in concert, likely initiated by some external factor(s).  This would explain why there are so many variants of autism and why there can seem to be autistic-like traits in close relatives.


Gene-based Autism Research
Several candidate genes have been identified, such as those linked to fragile X syndrome, tuberous sclerosis etc.  Researchers then follow the science from the target gene to identify a possible therapy.  At this point the researchers then seem to lose their scientific logic; they then try and apply their new therapy to all kinds of autism, i.e. the ones without the “faulty gene”.

This really goes back to our current limited understanding of the brain, medicine is more art than science, and we should perhaps suspend logic and accept this trial and error approach as valid.  At least call it trial and error.

Creatine is an organic acid produced naturally in the body.  It helps to supply energy to all cells in the body. This is achieved by increasing the formation of adenosine triphosphate (ATP).

Creatine is not an essential nutrient, as it is manufactured in the human body from L-arginine, glycine and L-methionine.
Its main use as a supplement/drug is among people wanting to develop their muscles, like athletes and bodybuilders.  Taking the standard dose of 5-10 mg has the same effect as eating a very high protein diet.  In people with muscle wasting diseases, Creatine is also used.  What I found interesting was the research showing an effect in depression.  There are marked similarities between conditions like depression and ASD.
We will return later in the post to another reason that Creatine may be relevant to autism; it appears to be something the research community did not notice.  Now back to those professional researchers:-
Creatine Deficiency
Science has identified three types of Creatine deficiency and all three lead to mental retardation and/or autism.  Two types are very rare, but are treatable; the third type is far more common, affecting about a million people worldwide, and is currently untreatable in humans.  In mice, this third type has been “cured”, but the money is not yet available to develop and test a human version of the therapy.
1.      AGAT 
AGAT (L-Arginine:glycine amidinotransferase) is an enzyme.  This enzyme is needed for the body to produce Creatine.  AGAT deficiency will cause Creatine deficiency  and lead to mental retardation and autism.
For those regularly following my blog, please note the following: It has been suggested that AGAT activity in tissues is regulated in a number of ways including induction by growth hormone (GH) and thyroxine (T4).

The actual genetic mutation associated with AGAT involves a tryptophan codon being converted to a stop codon at residue 149.
You may recall in my post on serotonin, we learnt about its precursor tryptophan and how it appears to be degraded in the autistic brain.

2.     GAMT
GAMT (Guanidinoacetate N-methyltransferase) is another enzyme required to produce Creatine.  As with AGAT deficiency, if you are deficient in GAMT, autism and mental retardation will follow.

If diagnosed, defects of Creatine biosynthesis are treated with Creatine supplements and, in GAMT deficiency, with ornithine and dietary restriction of arginine through limitation of protein intake.
3.     X-linked Creatine deficiency
The final type of Creatine deficiency is much more common, but is much more difficult to treat.  The defect is the Creatine transporter that should allow the Creatine into brain cells, where it plays a critical role in the brain’s energy needs.  No matter how much Creatine you give to people with this disorder, they cannot use it, because their Creatine transporters (CRTs) are defective.

Fortunately, thanks to Dr Joseph Clark, Professor of Neurology at the University of Cincinnati, there is light at the end of the tunnel.  Dr Clark has been researching the Creatine metabolism for some years.  Very unusually, he has been sharing his experiences with us, via his blog.
To cut a long story short, the good doctor has figured out that by using an analog (a modified version) of Creatine called cyclocreatine he could normalize the function of mice with  X-linked Creatine deficiency.  All he now has to do, is to make it work in humans, fully test it and get it FDA approved.  The problem is there is no more money.  In his blog post he tells us that all he needs is:-
$26 million and three more years

Here is the official report from the University:- 
Peter’s thoughts on Creatine
I started looking at Creatine because it appears to stimulate IGF-1 (insulin-like growth factor 1).  This is not a fact well-known to endocrinologists, but it is very well known to athletes and body builders.  They take Creatine orally and it stimulates muscle growth.  Research has even measured the change in IGF-1 in muscle tissue resulting from Creatine supplementation.

In a recent post I pointed out that IGF-1 is itself being used in autism trials, as is a novel Australian analog of IGF-1 [1-3] called NNZ-2566.  The big advantage of NNZ-2566 is that it is taken orally.

The release of IGF-1 is stimulated by growth hormone GH.  Secretion of growth hormone (GH) in the pituitary is regulated by the hypothalamus, which release the peptides Growth hormone-releasing hormone (GHRH) and Growth hormone-inhibiting hormone (GHIH) into the blood surrounding the pituitary. GH release in the pituitary is primarily determined by the balance of these two peptides, which in turn is affected by many physiological stimulators (e.g., exercise, nutrition, sleep) and inhibitors (e.g., free fatty acids) of GH secretion.
Stimulators of growth hormone (GH) secretion include:
  • peptide hormones
    • GHRH  through binding to the growth hormone-releasing hormone receptor
    • ghrelin through binding to growth hormone secretagogue receptors
  • sex hormones
    • increased androgen secretion during puberty (in males from testis and in females from adrenal cortex)
    • estrogen
  • clonidine and L-DOPA by stimulating GHRH release

·         α4β2 nicotinic agonists, including nicotine, which also act synergistically with clonidine 
      (Interestingly clonidine is a drug used for ADHD, or autism-lite, as I call it)

Factors that are known to cause variation in the levels of (GH) and IGF-1 in the circulation include: genetic make-up, the time of day, age, sex, exercise status, stress levels, nutrition level and body mass index (BMI), disease state, race, estrogen status and xenobiotic intake. The later inclusion of xenobiotic intake as a factor influencing GH-IGF status highlights the fact that the GH-IGF axis is a potential target for certain endocrine disrupting chemicals. These are chemicals found in both household and industrial products that are known to interfere with the synthesis, secretion, transport, binding, action, or elimination of natural hormones in the body that are responsible for development, behavior, fertility, and maintenance of normal cell metabolism. 
Based on my earlier primary research, I am pretty sure that in the sub-type of autism I am dealing with, there is a deficiency of either GH or TRH, in the brain.  As I result, I am interested in mention of these hormones.

 SHANK3 deficiency
(also known as 22q13 Deletion Syndrome or Phelan-McDermid Syndrome)

IGF-1 is being trialled at Mount Sinai Hospital in New York in autistic children with SHANK3 deficiency.  In true “art” rather than “science” approach, the plan is then to trial IGF-1 on children without SHANK3 deficiency.

Here is a good explanation.
If you live in the Big Apple:-

Where Can I Get Testing?

The Icahn School of Medicine at Mount Sinai offers genetic testing for Phelan-McDermid Syndrome/22q13 Deletion Syndrome and for SHANK3 mutations. A blood sample is needed to conduct the test. For more information about testing, visit The Seaver Autism Center, call (212) 241-0961  

It appears that SHANK3 deficiency accounts for about 1% of autism cases.
If, as is hoped, IGF-1 turns out to be a useful therapy in SHANK3 deficient children, it will be tried on all ASD kids.  If it works, then what was the relevance of SHANK3 in the first place?   It seems pretty odd to me.  I think most likely our current understanding of genetics is so basic, as to be flawed.

I am working via observation, rather than genetics; I know what circumstances produce near neurotypical behaviour, I just need to understand what is going on biologically.  This is how I ended up with TRH and/or GH.

Well if the Mount Sinai study is successful, as it probably will be, we should find Dr Clark in Cincinnati and give him $26 million.  Then we put creatine and cyclocreatine in a pill and give it to ALL people with ASD, since 99% will never get their sub-type diagnosed. 

Either the creatine, the cyclocreatine or the extra IGF-1 will do some good, depending on the sub-type – something for everyone. And no needles.