migraine ion channels

Migraine Energy Metabolism: Connecting Some Dots

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I have been reading some of the fascinating posts by Angela Stanton PhD concerning her research in migraine headaches. I regard the substance of her discussions as somewhat like dots on a chart that need to be connected. I learned a great deal about the chemistry involved in migraine. One of her comments that involves ion homeostasis in brain metabolism is fascinating. She noted that “serotonin is created by a normally functioning brain. Why it decreases or increases in the brains of migraineurs has always puzzled me. Should we not try to find out why?” That simple three letter word is the heart and soul of research and I believe that I may be able to add some information that might provide an answer.

Ehlers Danlos and Migraine

In one of Angela’s posts she discusses a subject which has been of interest to me for many years, the overlap of symptoms in disease. She noted that 60% of migraineurs have one type of Ehlers Danlos syndrome (EDS) and 43% of EDS have minor changes in DNA (SNPs) found in migraineurs. She concludes that they must be related. Over 70% of migraineurs have Raynaud’s disease and there is an overlap with EDS and Raynaud’s. Therefore, she concludes that these three diseases are variants. In  fact, there is an association between EDS, Postural Othostatic Tachycardia Syndrome (POTS) and a group of conditions known as mast cell disorders. EDS-HT, (one of the manifestations of this disease), is considered to be a multisystemic disorder, involving cardiovascular, autonomic nervous system, gastrointestinal, hematologic, ocular, gynecologic, neurologic and psychiatric manifestations, including joint hypermobility. Many non-musculoskeletal complaints in EDS-HT appear to be related to dysautonomia, consisting of cardiovascular and sudomotor dysfunction. Many of the clinical features of patients with mitral valve prolapse can logically be attributed to abnormal autonomic function. Myxomatous degeneration of valve leaflets with varying degree of severity is reported in the common condition of mitral valve prolapse.

A woman, with what was described as a “new” type of EDS, died after rupture of a thoracic aortic aneurysm. Autopsy revealed myxomatous degeneration and elongation of the mitral and tricuspid valves. Patients with POTS, a relatively common  autonomic disorder, may have EDS, mitral valve prolapse, or chronic fatigue syndrome and are sensitive to various forms of stress, as depicted in the clinical treatment of a dental patient affected by the syndrome. Dysautonomia has been described in the pathogenesis of migraine, featured by nausea, vomiting, diarrhea, polyuria, eyelid edema, conjunctival injection, lacrimation, nasal congestion and ptosis. In general, there is an imbalance between sympathetic and parasympathetic tone.

Energy Metabolism and Migraine

Technological studies have confirmed the presence of deficient energy production together with an increment of energy consumption in migraine patients. An energy demand over a certain threshold creates metabolic and biochemical preconditions for the onset of the migraine attack. Common migraine triggers are capable of generating oxidative stress  and its association with thiamine homeostasis suggests that thiamine may act as a site-directed antioxidant. It strongly suggests that migraine is a reflection of an inefficient use of brain oxygen.  An intermediate consumption of oxygen between deficiency and excess appears to be a necessity at all times. In fact,” moderation in all things” is an important proverb

Backing up energy deficiency, two cases of chronic migraine responded clinically to intravenous administration of thiamine. However, the authors are in error when they state in the abstract that “nausea, vomiting and anorexia of migraine may lead to mild to moderate thiamine deficiency”. An otherwise healthy 30-year-old male acquired gastrointestinal beriberi after one session of heavy drinking. Nausea, vomiting and anorexia relentlessly progressed. He had undergone 11 emergency room visits, 3 hospital admissions and laparoscopy within 2 months but the gastrointestinal symptoms  continued to progress, unrecognized for what these symptoms represented. When he eventually developed external ophthalmoplegia (eye divergence), he received an intravenous injection of thiamine which reversed both the neurologic and gastrointestinal symptoms within hours.

In other words it is important to be aware that nausea, vomiting and anorexia are primary symptoms of beriberi due to pseudohypoxia in the brainstem where the vomiting center is located. Chronic migraine has a well documented association with insulin resistance and metabolic syndrome. The hypothalamus may play a role. One of Angela’s comments concerns ion homeostasis in migraines. Thiamine triphosphate (TTP) can be found in most tissues at very low levels. However, organs and muscles that generate electrical impulses are particularly rich in this compound. Furthermore, TTP increases chloride (ion) uptake in membrane vesicles prepared from rat brain, suggesting that it could play an important role in the regulation of chloride permeability. Although this research was published in 1991, the exact role of TTP is still unknown. It has been hypothesized that thiamine and magnesium deficiency are keys to disease.

Angela wondered why serotonin might be increased or decreased in migraineurs. I strongly suspect that it is due to brain thiamine deficiency as the ultimate underlying cause of the migraine. In a review of thiamine metabolism, it was pointed out that metabolites could be high or low according to the degree of the deficiency. Victims of beriberi were found to have either a low or a high potassium according to the stage of the disease. If they were found to have a low acid content in the stomach, treatment with thiamine resulted in a high acid content before it became normal. If the stomach acid was high it would become low before it became normal. Since low and/or high potassium levels may be found in the blood of critically ill patients, thiamine deficiency should be a serious consideration in the emergency room or ICU Thiamine deficiency may be the answer for the fluctuations of serotonin observed in migraine.

Redefining Disease Models

According to the present medical model, each disease is described as a constellation of symptoms, physical signs and laboratory studies, each with a separate etiology. The overlap discussed by Angela suggests that the various conditions nominated have a common cause and that they are indeed nothing more than variations. If energy metabolism is the culprit, it would make sense of the infinite variations according to the degree and distribution of cellular energy deficiency. EDS-HT, described above is reported as a multi-system disease, exhibiting cardiovascular, autonomic gastrointestinal, hematologic, ocular, gynecological and psychiatric symptoms as well as the joint mobility. It seems to be impossible to explain this multiplicity without invoking energy deficiency as the cause. People with prolapsed mitral valve and a patient with a “new” form of EDS, reportedly have myxomatous degeneration as part of their pathology and it is tempting to suggest that such an important loss of structure might well be because of energy deficit.

The controls of the autonomic nervous system are located in the lower part of the brain that is particularly sensitive to thiamine deficiency and beriberi is a prototype for thiamine deficiency in its early stages. Dysautonomia is frequently reported as part of many different diseases, offering energy deficiency as the etiology in common. Yes, it is true that thiamine is not the only substance that enables the production of ATP. Nevertheless, it seems to dominate the overall picture of energy metabolism. It has long been considered the essential focus in the cause of beriberi, even though all the B complex vitamins are found in the rice polishings. Milling and the consumption of white rice was the prime etiology of the disease when it was common in rice consuming cultures.

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This article was published originally on June 22, 2020.

The Anatomy of a Migraine

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What is the anatomy of a migraine? Do migraines have an anatomy, a location map, in the same way heart disease does? Sure, migraine happens in the brain and we feel the pain in our head if there is pain – not all migraines come with pain, but does the pain guide us to a causative anatomy of the migraine the same way a heart attack does to the heart? No, it does not; at least not in the same way a blocked artery points to the cause of heart attack. The symptoms of migraines correspond to no specific regions of the brain, except in the case of the aura migraine, which points at the visual cortex. Only about 15% of those with migraines have auras. For 85% of the cases, we do not have the anatomical location of the migraine understood. Most science seems to consider aura and non-aura migraine different in nature and cause. Are they? Maybe not.

Most migraines are not connected to the symptoms we feel (nausea, dizziness, IBS, RLS, anxiety, nausea, vomit, etc.) and because of the variety of symptoms, there is nothing to guide us, such as a scan of the arteries for heart or a stroke. Another contributing factor is that there are no pain sensing nerves in the brain. All pain is felt by the trigeminal neuron receptors that are located on the meninges of the brain. That is, the pain we feel as migraineurs is disconnected from the actual location that causes migraines. To find the anatomy of a migraine, we need to go beyond the symptoms and the pain of the disease, beyond the visible disturbance of the eye in the aura, to the underlying cause for these symptoms.

For much of recent history, migraine research has revolved around two discrete theories of migraines: vascular and non-vascular mental illness. The two schools of thought were merged into what is now called neurovascular disease. But the latest findings suggest that there is more to migraines than neurovascular disease.

Migraine as Vascular Disease

For much of the 20th century, migraine was considered to be a vascular disease. This meant that migraine pain was caused by cranial blood vessel dilation or constriction. Still today we can see many over-the-counter migraine drugs that constrict blood vessels with caffeine in order to constrict the vascular structure of the brain (and the heart and the rest of our body). Alternatively, many doctors still prescribe beta blockers that reduce blood pressure and loosen arteries for easier blood flow and reduced constriction. If migraine is a disease of vascular nature, what causes the cranial vasodilation changes, particularly if these changes do not affect the heart or other parts of the body? This is the first clue that migraines are something more than just vascular in nature.

Migraine as Non-Vascular Mental Illness

The second prominent theory in migraine research attributes migraine pain to alterations in neurotransmitters, specifically, serotonin. Research is confusing on whether migraineurs have less or more serotonin than non-migraineurs. The possible serotonin connection brought us the many prescription drugs containing, increasing, or decreasing serotonin in the brain (triptans, SSRIs and others). Today, most migraineurs receive at least one serotonin enhancing drug; some I know receive serotonin blocking drug but that represents the minority. I was one of the millions of migraine patients who received serotonin enhancers (triptan) and also one of the millions of migraineurs for whom these medications did not work.

Again, I must ask, if there is a serotonin deficiency or overflow in migraineurs, what causes it? And if it is a deficiency as is proposed to be the case for most migraineurs, isn’t this the same proposed deficiency as in depression? Why then don’t most who are depressed also suffer from migraines or why do those who suffer migraines as a result of lack of serotonin not suffer depression? It is not clear to me that there is any connection between serotonin and migraine since most migraineurs I know are not at all depressed and most depressed do not have migraines. This tells me that something is not right with the concept of identical treatments for such two completely different illnesses.

Serotonin is created by a normally functioning brain. Why it is deficient, or in some cases, elevated in the brain of migraineurs has always puzzled me. It still puzzles me that others didn’t ask why neurons cannot produce the right amount of serotonin on their own or why physicians so easily prescribed drugs to add or enhance what the brain was not making. Should we not find out why the neurons are not producing serotonin in the first place? Wouldn’t this help us better treat and maybe even cure migraines?

Migraine and New Research

The most recent theory about migraines involves the aberrant electrical discharges associated with migraine and a phenomenon called cortical spreading depression:

Cortical spreading depression (CSD) and depolarization waves are associated with dramatic failure of brain ion homeostasis, efflux of excitatory amino acids from nerve cells, increased energy metabolism and changes in cerebral blood flow (CBF). There is strong clinical and experimental evidence to suggest that CSD is involved in the mechanism of migraine, stroke, subarachnoid hemorrhage and traumatic brain injury. (Lauritzen et al., J Cereb Blood Flow Metab)

Researchers have linked CSD to the eminent onset of migraine pain. Such a rapid change in brain ion homeostasis can affect changes in neurotransmitter concentrations, causing cranial vascular dilation and ionic imbalance with depolarized regions. These changes can evoke what migraineurs sense as pain but one has to ask by what mechanisms are these ionic brain changes initiated and by what pathways do they elicit the pain. For the first question, let us return to the concept of neural dehydration and salt deficiencies as possible instigators.

A Unified Theory of Migraine Pain

A new report shows migraines, seizures and strokes are all about ion (sodium, potassium, chloride, magnesium, and oxygen) homeostasis. These particular models looked at how changing potassium ion concentration affects brain activity and how seizures and migraines have similar underlying mechanisms. Potassium’s job is to work both inside and outside of the neurons helping to balance homeostasis by ensuring that potassium ions are in the correct place all the time. Potassium is a diuretic substance and helps in the removal of excess or used water from the cell. If there are too many potassium ions inside or outside of a neuron, with all else remaining constant, the neuron will end up dehydrated because of the osmotic gradient.

The overabundance of potassium and a depletion of both extra-cellular sodium chloride reduces water, and changes the pH balance (acidic level) of the neuron (Costa et al., The Journal of Headache and Pain). Recall from my earlier post: Dehydration and Salt Deficiency Trigger Migraines, that channels on the membrane of the neuron allow for leaks using osmotic gradient to balance the internal and external ionic content. Because ionic homeostasis balance is required for a healthy brain, the ionic balance must be true for all electrolyte elements, including sodium as well. Not enough sodium can cause a potassium overabundance that can trigger migraines because the neuron is not able to generate electricity or retain water.

In  Dehydration and Salt Deficiency Trigger Migraines, I talked about the importance of hydration and explained how that works at the cellular level. I introduced the sodium-potassium pumps and their role in keeping the cell hydrated. Through the sodium-potassium pumps sodium ions and potassium ions head in and out of the neuron when proper electric currents are established. For the electric current, the ionic balance of sodium and chloride is essential so that the pumps can open and close. There are also osmotic channels through which leakage of ions may happen depending on higher or lower levels of ions inside versus outside the cell—the osmotic gradient.

The phenomenon of cortical spreading depression is a slow spreading electrical surge corresponding to depolarized regions of migraine initiating locations. It is initiated by ion imbalance where the normal homeostasis has been lost. Here the sodium-potassium pumps do not function properly; the channels leak too much potassium and water, magnesium and oxygen out from the neuron. If these ions cause imbalance, trouble ensues. Even a small, unnecessary increase in potassium outside the cell can lead to seizures and by association to migraines.

It’s All About the Ions

So, beneath the vascular and non-vascular definitions of migraine, the neurotransmitter imbalances and the hyper-excitability of neurons in the certain brain regions associated with migraine, are simple variations in ionic balance, responsible for the onset of migraine and the possibility of vasoconstriction or relaxation changes as a consequence. Too much or too little of one or more ions, evokes changes in brain’s electrical activity that can lead to migraines or seizures. Where in the brain those changes occur determines the type of symptoms a migraineur experiences. For example, with aura migraine the anatomical initiating migraine location is the visual cortex. The migraineur sees the aura with eyes also closed. So what the migraineurs sees is happening inside the brain and not outside. The visual cortex’s function is to translate the light signals it receives into meaningful images of objects. The CSD is an electric storm that the visual cortex interprets as aura. The aura usually starts with a blind spot. It is my belief that the blind spot represents the region of neurons that is the cause of the migraine; the depolarized region that the CSD is trying to activate.

Concluding Remarks

The overall neuron-behavior is very complex but today we can say with a high degree of conviction that:

  • Migraines are caused by malfunctioning neurons as a result of ion imbalances.
  • Ion imbalance can be visualized by regions of depolarization.
  • Depolarized regions demonstrate the anatomy of the disturbance.
  • Hydration and maintaining proper ionic balance (correcting salt deficiency, magnesium deficiency, potassium excess or deficiency) is important for migraineurs since the slightest ionic imbalance can cause a migraine.

From my perspective, I am glad to see the most recent attempts at understanding physiological problems in the brain behind the migraine. This is a very important shift in migraine research – looking beyond the symptoms for a cause. Nevertheless, I am still looking for answers. How does the ion balance become so disturbed that it initiates a migraine? Why does this happen for some folks and not others?  Those are the questions, researchers and clinicians need to address. My theory is that the depolarized regions of the brain result from disturbances in homeostasis and ion balance which are precipitated by dietary deficiencies. We need to determine the proper amounts of each mineral and micronutrient required for the well-functioning brain to reduce migraine.

Sources:

  1. Clinical relevance of cortical spreading depression in neurological disorders: migraine, malignant stroke, subarachnoid and intracranial hemorrhage, and traumatic brain injury. Martin Lauritzen, Jens Peter Dreier, Martin Fabricius, Jed A Hartings, Rudolf Graf, and Anthony John Strong; J Cereb Blood Flow Metab. Jan 2011; 31(1): 17–35. Published online Nov 3, 2010. doi:  10.1038/jcbfm.2010.191 PMCID: PMC3049472
  2. Cortical spreading depression as a target for anti-migraine agents. Cinzia Costa, Alessandro Tozzi, Innocenzo Rainero, Letizia Maria Cupini, Paolo Calabresi, Cenk Ayata and Paola Sarchielli1; Costa et al. The Journal of Headache and Pain 2013, 14:62
  3. Interpreting fMRI data: maps, modules and dimensions. Hans P. Op de Beeck, Johannes Haushofer & Nancy G. Kanwisher Nature Reviews Neuroscience 9, 123-135 (February 2008)
  4. Mechanisms of migraine aura revealed by functional MRI in human visual cortex. Hadjikhani N1, Sanchez Del Rio M, Wu O, Schwartz D, Bakker D, Fischl B, Kwong KK, Cutrer FM, Rosen BR, Tootell RB, Sorensen AG, Moskowitz MA. Proc Natl Acad Sci U S A. 2001 Apr 10;98(8):4687-92. Epub 2001 Apr 3.
  5. Unification of Neuronal Spikes, Seizures, and Spreading Depression. Yina Wei, Ghanim Ullah, and Steven J. Schiff ; The Journal of Neuroscience, 27 August 2014, 34(35): 11733-11743; doi: 10.1523/JNEUROSCI.0516-14.2014