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Is this the secret to fixing the hyperinsulinemia ?

Posted by Dr Sandy on in Obesity | 234 Views | Leave a response
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Fatty liver the cause not the consequence of hyperinsulinemia

GABA keeping beta cell awake all night

Fat filled liver cells leak GABA. The leaked GABA hooks up to GABAA receptors on the hepatic afferent nerve, to slow nerve firing and this increases insulin secretion

Insulin’s job is to PUT AWAY the groceries.

Now, with this kind of job description, one would expect insulin to ONLY be out and about, during the day, when eating happens.

And in healthy folks, this is pretty much the story.

Ready, set, go..

Insulin levels quickly  rise in response to the arrival of a meal, both the presence of sugars and amino acids, spark a flurry of activity in the pancreas.  The insulin that is released, quickly  gets to work moving nutrients out of the blood and into tissues.   Once all the sugar has been taken care of and the sugar levels are back IN RANGE, the cells responsible for insulin production, can take a break.

Until the next feeding occasion.

Go SLOWLY

Now when you’re insulin resistant, the pancreas seems to be a little slow off the mark, when you eat something yummy. Unfortunately, this tiny delay, can mean that sugar levels rise a little higher than ideal, but when all is said and done,  the sugar is handled.

We admonish the pancreas for being slow.

But what is not always appreciated, is one of the reasons  for the dilly dallying, is the beta cells, are taking SERIOUS strain.

They’re  being expected to produce insulin 24/7.

Instead of insulin levels,  ebbing and flowing, across the day and flat lining, overnight, in the metabolically challenged insulin levels are high : morning, noon and NIGHT.

circadian rhythm of insulin in healthy person

NOTE : People who are insulin resistant, wake up with high levels of insulin, despite not having eaten for hours.

Hyperinsulinemia stressful

The high insulin levels are not just stressful for beta cells, pretty much every body part SUFFERS. The lucky ones manage to…………. RESIST insulin !

Among the most vulnerable body parts, are blood vessels.

Since they are bearing the full brunt of the egomaniac whose mission it is, is to put away THE GROCERIES.

High insulin is not healthful for anyone.

Doctors call it metabolic syndrome – it’s the bad body chemistry behind, heart attacks, diabetes and many cancers.  Eish !   Ironically, the way they often treat it, is to demand beta cells work harder.  Eish !

Who is keeping beta cells awake all night ?

This is the big question……….

The first response might be, the elevated glucose levels are the problem.  But, truth be told, it takes years of beta cell abuse, to get to the point, where they fail to deliver enough insulin, to keep the sugar levels IN RANGE.

Something or someone else, is keeping beta cells awake all night.

A team of researchers based in Tuscon, Arizona had a hunch, the someone was the liver.

A vagus powerplay

What clued them into this  was the fact that  the easiest way to stop excess insulin production, is to disconnect the liver from the parasympathetic network.

hepatic vagotomy

The procedure is called a hepatic vagotomy.

When the hepatic afferent nerve (HVAN) is snipped,  it  stops the liver from being able to send reports to the brain, but despite the missing data, the brain’s ability to run the show, is more or less intact.

More or less….. less insulin is produced overnight and there are no sugar spikes to worry about.

OGTT after hepatic vagotomyd

Effects of hepatic vagotomy on oral glucose tolerance test  and insulin levels after 9 weeks of high fat feeding.  Numbers below bar denote number per group.  © 2021 Elsevier Inc

Now, before you book yourself in for a hepatic vagotomy, BE WARNED.  It’s not a perfect solution.   Mice fed a high fat diet become IMMUNE to the “bad’” diet  i.e. they don’t pack on the pounds or develop metabolic complications.

But on the flip side, skinny mice become INSULIN RESISTANT !

NOTE :  This happens because stimulating the nerve, prompts the liver to produce something that increases glucose uptake in the muscle. Click here to learn more.

HVAN fire power

Our team wanted to know why, severing the nerve, resulted in less insulin being secreted,  despite an obesogenic diet. They theorized that if they could put the pieces of the puzzle together,  they could SOLVE the hyperinsulinemia problem and reap some rewards.

But at first glance, this decrease in insulin secretion, didn’t  make sense…….

Studies have shown, nerve firing dampens down insulin secretion  !

how hepatic afferent nerve firing impacts insulin secretion

Conversely,  only when the nerve is NOT firing, is insulin secretion, amplified  !

Eish !  Biology is complicated.

No  fire power

There were two possible explanations for the increased insulin secretion,  associated with obesity….

The liver is either firing up the nerve, by sending excitatory chemicals it’s way

OR

It’s interfering with the signal, that should dampen down the response.

GABA is the signal

Using slices of liver from obese animals, the team pin pointed the signal….

Fatty liver leaking GABA

Release of GABA from hepatic slice. © 2021 Elsevier Inc

Fatty livers were deliberately dampening down the nerves response, by releasing GABA, the quintessential inhibitory neurotransmitter.

The releasing of the GABA is not entirely voluntary.

It’s leaking out.

A positivity problem

Using a combination of mutant mice and pharmacologically, our team pieced together  why and how fat livers,  drive beta cells……………. CRAZY !

They’re full of positive ions.

In biological speak, the liver cells’ membranes  are depolarized.

Energy deprived

Inside a hepatocyte full of fatThe reason for this unfortunate situation is despite being  full of fat aka. fuel, the hepatocytes are short of energy, because accessing the fuel in those  lipid droplets is not easy.  The energy shortages, force them to cut back  on some energy intensive processes, such as pumping sodium out, via the Na K ATPase pump.

This creates  the positivity problem.

And contributes to there being  a little more GABA than usual, thanks to GABA shunt.

Since GABA is ordinarily transported by ion dependent transporters,  the enhanced positivity, sees more GABA moving out of the cells.  Once it’s out of the cells, it is able to hook up with GABAA receptors on the hepatic afferent nerve, where it does what GABA does…it INHIBITS.

And nerve firing slows.

Insulin secretion increases, effectively cancelling  beta cell tea breaks….

GABA the bad guy  ?

Only on paper.

GABA is THE MAJOR inhibitory neurotransmitter – 60-75 % of all synapses in the brain are GABAergic and the pancreas,  has it’s own GABAergic system in place, which keeps beta cells happy and healthy.   So the option to exploit this biology, is more than likely a fantasy, but the research team are committed to give it a go.

The trouble is stopping, the production of this tiny amount of GABA,  which is being produced locally, deep inside the liver, will potentially have  a lot of negative consequences.

GABA is  ESSENTIAL !

But all is NOT LOST…….

 GABA levels track fat levels

GABA levels tracking fat accumulation

Relationship between GABA release and liver triglyceride levels. © 2021 Elsevier Inc

The team found, the more fat stashed away in the liver, the more GABA was being leaked out.

Fatty liver goes hand in hand with metabolic syndrome.

It’s typically seen as a consequence of insulin resistance,  but this research suggests, it might be a big contributor to the problem.  And what needs to BE FIXED, in the metabolically challenged.

The fix for fatty liver

Different steps in fat processing by the liver

There are multiple points in the fat processing cycle of the liver, that can be leveraged.

One that might not be on your radar is to facilitate the assembly of VLDL particles.  You can do this, by making sure  your liver cells have an adequate supply of BUBBLE WRAP i.e. choline. Click here to learn more.

Hepatocyte membrane potential regulates serum insulin and insulin sensitivity by altering hepatic  GABA release.  Cell Reports (2021) 35: 109298. Caroline E. Geisler, Susma Ghimire, Chelsea Hepler, Kendra E. Miller, Stephanie M. Bruggink, Kyle P. Kentch, Mark R. Higgins, Christopher T. Banek, Jun Yoshino, Samuel Klein, and Benjamin J. Renquist

A critical role of hepatic GABA in the metabolic dysfunction and hyperphagia of obesity.  Cell Reports (2021)  35: 109301. Caroline E. Geisler, Susma Ghimire, Stephanie M. Bruggink, Kendra E. Miller, Savanna N. Weninger, Jason M. Kronenfeld, Jun Yoshino, Samuel Klein, Frank A. Duca, and Benjamin J. Renquist

Further reading

insulin as a knight

It’s time diabetics stop seeing insulin as a knight in shining armour

SUGAR is the enemy and INSULIN is the saviour. The “success” of bariatric surgery, as a treatment for type 2 diabetes, is forcing a re-think of the story.

insulin topping up a fat cell

The diabetes timeline doesn’t start with TOO MUCH FAT

The story of diabetes is always written like this…. you put on weight, become insulin resistant, then eventually diabetic. But, this diabetes timeline is WRONG.

too much insulin not too little

You want LESS insulin, NOT MORE, if you have type 2 diabetes

Normal mice, fed a normal diet but given, EXCESS insulin, develop type 2 diabetes. More insulin is NOT the cure for type 2 diabetes.

 

Want to discover more ways to create BETTER BODY CHEMISTRY ?

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Posted in Obesity | Tagged beta cells, energy, fatty liver, GABA, hepatic, hyperinsulinemia, insulin, insulin resistance, insulin secretion, liver, metabolic syndrome, vagotomy

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Located in Johannesburg, South Africa

Disclaimer : The stories and articles are provided as a service. Dr Sandy's opinions are for information only, and are not intended to diagnose or prescribe. For your specific diagnosis and treatment, consult your doctor or health care provider.
 

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