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Laura Pace

Laura Pace brought a rigorous and bracing slant to gut disorders in post-viral illnesses

This has been an Institute of Neuroimmune Medicine and Bateman Horne Center month. We started off with a review of the Institute’s recent Conference, then used Dr. Yellman’s (Bateman Horne Center) overview of mast cell activation syndrome (MCAS), then dug into an exercise study from Nancy Klimas’s Institute of Neuroimmune Medicine, and now here we are with a YouTube talk produced by the Dr. Bateman’s Bateman Horne Center.

It featured Laura Pace MD, Ph.D. a neurogastroenterologist and co-founder of the new and very exciting Metrodora Institute which is focused on neuroimmune axis disorders; i.e. diseases like dysautonomia, chronic fatigue syndrome (ME/CFS), POTS, Ehlers-Danlos Syndrome (EDS) and long COVID. Pace is a Medical Board member for Dysautonomia International and Chair of the Gastrointestinal Working Group for the International Consortium on Ehlers-Danlos Syndrome and Hypermobility Spectrum Disorders.

Pace and Metrodora are focused on bringing cutting-edge diagnostics and treatments to people with neuroimmune axis disorders. Health Rising will have more on Metrodora later.

The Talk

Be prepared! Some may find Dr. Pace’s critical approach to the gut problems found in these diseases upsetting. She throws cold water on some of the gut therapies that people with these diseases try. She also illuminates new opportunities that can help patients finally get accurate gut diagnoses and points to future possibilities that should help to greatly improve treatments. Her ultimate goal is personalized treatments that work.

First, she gave us some background on the gut and the neuroimmune system.

Two key things to remember are that in the gut, the tissues, neurons, immune and endocrine cells are in close proximity to each other and are talking to each other; i.e. what affects one may affect the others. With regards to the neuroanatomy of the gut, we’re basically talking about the autonomic nervous system (ANS) – a key system in chronic fatigue syndrome (ME/CFS), fibromyalgia (FM), long COVID, and others. Ultimately, the ANS affects everything from gut motility (the timely passage of food through the gut), to the integrity of the intestinal barrier, to the makeup of the microbiome, and to how well we absorb nutrients.

Dr. Pace noted that studies suggest that 25% of long-COVID patients have gut symptoms (nausea, bloating, abdominal pain, constipation, early satiety, diarrhea, adverse reactions to foods, flushing, and rashes), but she thinks it’s probably higher than that and it’s going to get higher still. Indeed, a progression of gut problems over time is going to be a major theme in her talk. She warned doctors that early symptoms can be mild, but if their patients get worse, they should be re-evaluated.

Pace does not think much of microbiome studies for the simple fact that 99% of them are focused on the flora in the colon or large intestine. The colon’s main function is to help you pass stool from the body – not to break down food and provide nutrients. After it forms what’s been given to it by the small intestine into a stool that’s then passed out of the body, its work is basically done. Her data shows that the stool microbiome does not approximate what’s found in the colon and doesn’t even come close to approximating the microbiome present in the small intestine microbiota.

The small intestine – the longest part of the gastrointestinal system – is where the real action takes place. It breaks down proteins and fats and then passes the nutrients into the bloodstream. Much of the vaunted immune activity that takes place in the gut occurs in the small intestine; it’s in the small intestine where the gut-brain or gut-neuroimmune axis takes place. If a leaky gut occurs, it’s most likely to occur in the small intestine, where increased gut wall permeability is necessary to allow for the passage of nutrients into the bloodstream.

Gut Motility Problems in ME/CFS, Long COVID, and Other Post-Viral Illnesses

Surprisingly, gut motility – the timely passage of food through the gut – has not been assessed in chronic fatigue syndrome (ME/CFS), fibromyalgia, or long COVID. Our digestive system is designed to systematically break down foods in a timely manner, send the nutrients into the blood, and then get rid of the waste. Problems with gut motility appear to be particularly present in severely ill ME/CFS patients who end up sometimes having to be fed through a tube.

Slowed food transit times can create problems with the absorption of nutrients (malnutrition), constipation, diarrhea, vomiting, abdominal pain, problems with blood sugar, and dysbiosis (unhealthy gut flora). Undigested food in your stomach can harden into a solid mass called a bezoar, causing nausea and vomiting. People with very slow gut motility can’t get enough nutrients and may need to feed through a feeding tube. Interestingly, problems with the vagus nerve – which appear to be common in ME/CFS – can lead to slowed gut motility.

Pace showed several other ways that macrophages and gut neurons interact to maintain gut motility. Both support each other, and loss of either will impair gut motility. What starts this process off – whether neuron damage causes macrophage problems or immune cell infiltration damages the nerves – is a major question that needs to be answered.

Noting that mast cell disorders are common in post-viral illnesses, Pace described a kind of feed-forward process. Gut neurons release neurotransmitters and neuropeptides that cause the mast cells to degranulate (releasing histamine, serotonin, tryptase (actually possibly hundreds of factors), which feed back to the neurons, causing them to release more neurotransmitters, etc., causing more and more inflammation – both in the body and the brain.

Gut issues don’t just cause gut symptoms. Inflammatory substances secreted by the gut microbes, which enter the blood and travel to the central nervous system, can produce many of the symptoms associated with post-viral illnesses including fatigue, brain fog, and headaches.

“Moving Way Beyond Symptom Management”

Cutting-edge Diagnostic Tools Required

Diagnosing what’s going on in the gut in these diseases will require leading-edge diagnostic tools. That’s probably no surprise to the many ME/CFS, FM, and long-COVID patients who have frequently been given a clean bill of health by their doctors.

The good news is that these tools have been developed. The bad news is that it’s not clear how readily available some of them are. The goal, Pace said, is “moving way beyond symptomatic management.” and to identify injuries and damage at the earliest stages – when it is most amenable to treatment.

The Smart Pill – A Game Changer

Smart Pill

Dr. Pace calls the Smart Pill a “gamechanger’ for diagnostics.

The SmartPill™ Motility Test does appear to be widely available. Pace noted that traditional gastric emptying tests miss the small intestine and a lot of her patients test normal on them. The SmartPill™ Motility Test, however, captures the motility of the entire gastrointestinal system. The capsule is ingested and uses pH readings to show where in the gut it is. It’s inexpensive, easy to use, and better than the past gold standard – which could only be done in specialized centers. Pace called the SmartPill a “game changer” as a gut diagnostic tool.

She mentioned a young woman with POTS, EDS, and MCAS who was told that she needed to be on solid food because her gastric emptying test was normal. The smart pill indicated that she actually met the criteria for “intestinal failure”. While she had rapid emptying in one part of her gut, her small intestinal transit time was 6 hours and her colonic transit time was over 100 hours (average 59). She was not absorbing nutrients and needed to get her nutrition via an IV (TPN).

Confocal Laser Endoscopy

Confocal laser endoscopy (CLE) has actually been around for a while and may be available. It’s clearly much superior to the former gold standard – which analyzed biopsies using white light endoscopy (WLE). WLE is time- and cost-expensive, has low resolution, often misses things (apparently because it relies on biopsies), and requires anesthesia. Pace said the WLE technique will miss injuries found in the deeper layer of the endothelium protecting the gut.

Leaky gut

Eating an allergic food caused leaky gut almost immediately

Compare that to confocal laser endoscopy which uses a laser to optically scan tissues, and “provides a magnified, cellular level view of gastrointestinal epithelia”. CLE allows gastroenterologists to peer deeper into the tissues and can be used as a “real-time” tool; i.e. the gut can be perturbed, say, with foods, and the effect of those foods on the gut can almost immediately be seen.

A recent review reported that “advances in CLE imaging in IBD (inflammatory bowel disease) patients may be used not only to better understand the pathophysiology of the disease but also to guide optimized therapy, and thus allow a completely new, personalized approach to IBD management.” On the downside, confocal laser endoscopy has a “narrow field of view and high capital costs and (requires) specialized operator training”.

THE GIST

  • A recent Bateman Horne Center webinar featured Laura Pace MD, Ph.D. a neuro gastroenterologist and co-founder of the new and very exciting Metrodora Institute which is focused on neuroimmune axis disorders; i.e. diseases like dysautonomia, chronic fatigue syndrome (ME/CFS), and others.
  • Be prepared! Some may find Dr. Pace throws cold water on some of the gut therapies that people with these diseases try. She also illuminates new opportunities that can help patients finally get accurate gut diagnoses and points to future possibilities that should help to greatly improve treatments. Her ultimate goal is personalized treatments that work.
  • Dr. Pace noted that studies suggest that 25% of long-COVID patients have gut symptoms (nausea, bloating, abdominal pain, constipation, early satiety, diarrhea, adverse reactions to foods, flushing, and rashes), but she thinks it’s probably higher than that and it’s going to get higher still. Indeed, a progression of gut problems over time is going to be a major theme in her talk.
  • Gut issues don’t just cause gut symptoms, though. Inflammatory substances secreted by the gut microbes, which enter the blood and travel to the central nervous system, can produce many of the symptoms associated with post-viral illnesses including fatigue, brain fog, and headaches.
  • Pace does not think much of microbiome studies for the simple fact that 99% of them are focused on the flora in the colon or large intestine. The colon’s main function is to help you pass stool from the body – not to break down food and provide nutrients. Her data shows that the stool microbiome does not approximate what’s found in the colon and doesn’t even come close to approximating the microbiome present in the small intestine microbiota.
  • The small intestine – the longest part of the gastrointestinal system – is where the real action takes place. It breaks down proteins and fats and then passes the nutrients into the bloodstream. the immune activity in the gut, the gut-brain axis, leaky gut – they are all most likely to occur in the small intestine.
  • Problems with gut motility – the timely passage of food through gut is a major problem in these disorders.  Slowed food transit times can create problems with the absorption of nutrients (malnutrition), constipation, diarrhea, vomiting, abdominal pain, problems with blood sugar, and dysbiosis (unhealthy gut flora). People with very slow gut motility can’t get enough nutrients and may need to feed through a feeding tube. Interestingly, problems with the vagus nerve – which appear to be common in ME/CFS – can lead to slowed gut motility.
  • Diagnosing what’s going on in the gut in these diseases will require leading-edge diagnostic tools. The good news is that these tools have been developed. The bad news is that it’s not clear how readily available some of them are. The goal, Pace said, is “moving way beyond symptomatic management.” and to identify injuries and damage at the earliest stages – when it is most amenable to treatment.
  • The SmartPill™ Motility Test does appear to be widely available. Pace noted that traditional gastric emptying tests miss the small intestine and a lot of her patients test normal on them. The SmartPill™ Motility Test, however, captures the motility of the entire gastrointestinal system. The capsule is ingested and uses pH readings to show where in the gut it is. It’s inexpensive, easy to use, and better than the past gold standard – which could only be done in specialized centers. Pace called the SmartPill a “game changer” as a gut diagnostic tool.
  • Confocal laser endoscopy uses a laser to optically scan tissues, and “provides a magnified, cellular level view of gastrointestinal epithelia”. CLE allows gastroenterologists to peer deeper into the tissues and can be used as a “real-time” tool; i.e. the gut can be perturbed, say, with foods, and the effect of those foods on the gut can almost immediately be seen.
  • A 2019 CLE study, “Many Patients With Irritable Bowel Syndrome Have Atypical Food Allergies Not Associated With Immunoglobulin“, that 50-60% of people with IBS have “atypical food allergies”. Within 5 minutes of the provocation (!), the CLE test was able to identify a reaction – increased fluid pressure/leaky gut) in the upper part of the small intestine. Interestingly, it took 2-6 hours before the symptoms showed up.
  • The IBS patients who removed the offending foods from their diet “showed a highly significant, long-term response… up to the 12 months of follow-up.”
  • CLE, then, provides the opportunity to quickly assess the effects foods are having on the gut, and clear up many food allergy issues. With symptoms – many of which may not appear to be gut related – showing up hours later, the test – if available – could be a game changer for people with food allergies. (How available it is for that purpose, I do not know.), Interestingly, it appears that eosinophils, not mast cells, were responsible for the food allergies.
  • Wheat was the standout allergen with the majority of the allergic IBS patients reacting to it (60.5%). Next came yeast (20%), milk (9.2%), soy (6.6%), and egg white (4%). The authors suggested that non–gluten-related allergens and amylase tryptase inhibitors probably played a large role in the wheat allergy seen.
  • For my part over the past year, I recently added wheat to my diet in a large way. At first, I didn’t notice any changes, but slowly over time, I experienced a huge uptick in pain – particularly muscle-related pain – and fatigue. My muscles had become contracted, tight, and painful. Interestingly, I noticed no increase in gut symptoms. Removing wheat dropped my pain levels substantially.
  • Dr. Pace asserted that the diagnosis of irritable bowel syndrome (IBS) and small intestinal bowel overgrowth (SIBO) simply means we don’t understand the biology behind what’s happening.
  • Dr. Pace is not a fan of probiotics and prebiotics or fecal transplants. Why inoculate the small intestine with bacteria associated with the colon? Hundreds of millions of dollars have probably been wasted, in her opinion – by looking at the wrong compartment. She felt that altering the microbiota without ways to track it was “dangerous” and could lead to longer-term problems. Until we know what’s happening in the small intestine, we shouldn’t do anything to modify it.
  • The histamine ingested from food hits receptors on cells that are meant to receive histamine from the gut. At best, that only produces very local effects. Histamine coming from the mast cells in gut tissues that are in close approximation to nerve fibers, on the other hand, can start a systemic cascade of mast cell and immune effects.
  • Besides better diets, she suggested removing obvious food triggers – or obvious combinations of foods – that produce symptoms.
  • There’s no harm in starting a trial of mast cell-targeted medication. She employs an H2 blocker 2-3x a day, and oral Cromolyn 4x a day. Some people have problems with tolerating Cromolyn, but she can usually get it to work. Patients should remember to slowly titrate it up as it can cause significant mast degradation (and produce lots of symptoms). She uses quercetin if Cromolyn doesn’t work, as she knows what’s in Cromolyn; not so much with plant-derived quercetin. She also uses leukotriene receptor antagonists.
  • Her go-to motility drug is pyridostigmine, and then later she may add on Motegrity.
  • Coming up – The Metrodora Institute – the kind of Institute we’ve been waiting for?

A 2019 CLE study, “Many Patients With Irritable Bowel Syndrome Have Atypical Food Allergies Not Associated With Immunoglobulin“, proved the tool’s worth when it validated the experiences of many irritable bowel syndrome (IBS) patients – and undoubtedly left some doctors with egg on their face. Many doctors have long denied the presence of food allergies in their patients when skin prick tests that assessed IgE reactions to foods tested out normal.

It turns out, though, that IgE-mediated allergies aren’t the only type of food allergy present. The large (n=155) 2019 German study used CLE to determine that 50-60% of people with IBS have “atypical food allergies”. (One suspects these food allergies may turn out to be quite typical). None of the patients who tested positive for CLE tested positive using a classical food allergy testing regimen (skin prick, serum IgE).

Within 5 minutes of the provocation (!), the CLE test was able to identify a reaction – increased fluid pressure/leaky gut) in the upper part of the small intestine. Interestingly, it took 2-6 hours before the symptoms showed up.

The IBS patients who removed the offending foods from their diet “showed a highly significant, long-term response… up to the 12 months of follow-up.”

CLE, then, provides the opportunity to quickly assess the effects foods are having on the gut, and clear up many food allergy issues. With symptoms – many of which may not appear to be gut related – showing up hours later, the test – if available – could be a game changer for people with food allergies. (How available it is for that purpose, I do not know.)

Surprise! Mast Cells Not Implicated in IBS

Back to the study. Reduced levels of the occludin enzyme, which plays an important role in maintaining gut barrier integrity, indicated that the food allergy IBS patients were indeed susceptible to leaky gut. An examination of immune cells did not implicate mast cells. Instead, it showed that T-cells and eosinophils were infiltrating the area where the damage occurred. Plus, no increases in tryptase levels (from mast cells) were found in the area.

The authors noted that proteins emitted by eosinophils “have been shown to be toxic to the intestinal epithelium and to rapidly induce epithelial barrier dysfunction” and that other studies have found “that increased eosinophil density and, especially, eosinophil activation are the hallmark of atypical food allergies.”

Wheat Shows Up Big Time

Wheat was the standout allergen with the majority of the allergic IBS patients reacting to it (60.5%). Next came yeast (20%), milk (9.2%), soy (6.6%), and egg white (4%).

Why did wheat take the cake when it came to atypical food allergies? It didn’t all come down to gluten. The authors noted that, while, yes, wheat contains a broad variety of potential gluten allergens, it “especially” contains non–gluten-related allergens and amylase tryptase inhibitors that have been shown to promote intestinal and airway allergies in mice with humanized immune systems.

My recent experience left me a believer in the ability of wheat to massively increase one’s symptoms. During my 40 years with ME/CFS, I’ve mostly stayed away from standard allergens such as wheat, dairy, and soy. I was only sure that soy, though, would immediately cause extreme fatigue.

Over the past year – not noticing any uptick in symptoms after test trials – I added wheat to my diet in a large way. At first, I didn’t notice any changes, but slowly over time, I experienced a huge uptick in pain – particularly muscle-related pain – and fatigue. My muscles had become contracted, tight, and painful. Interestingly, I noticed no increase in gut symptoms.

Finally, a light bulb came on and I rather reluctantly gave up wheat – and my pain diminished dramatically. On the very short scale of interventions that have helped with ME/CFS, removing wheat is at the top.

An ME/CFS Connection

As the German group was doing their thing, Armin Alaedini of Columbia was showing that people who did not have coeliac disease but reported symptoms after eating wheat had damage to the gut lining, systemic immune activation, and leaky gut. Once off wheat, he reported their markers of immune activation began to normalize.

Alaedini next assessed whether the same markers of immune activation he found in the aforementioned wheat study were showing up in ME/CFS. Using data from a past study, his findings suggested that about 15% of the ME/CFS patients fit the profile of having non-coeliac wheat sensitivity.

Questions

Poor Descriptors

In what she said was a pet peeve of hers, Dr. Pace asserted that the diagnosis of irritable bowel syndrome simply means we don’t understand the biology behind what’s happening.

Ditto with small intestinal bowel overgrowth (SIBO). The SIBO test – which measures gas production – tells you something is wrong but doesn’t tell you what it is. Pace clearly believes that these are crude designations that only scratch the surface of a complex problem. Treating SIBO with course after course of antibiotics was a mistake, she felt.

A Really Sick Patient

Dr. Bateman asked her about a really severely ill long-COVID patient who meets the criteria for ME/CFS and experiences severe sensory sensitivity and is clear that a lot of her symptoms are GI-related. Even drinking water (I’ve experienced symptoms from drinking spring water) triggers symptoms and abdominal pain and discomfort. She’s lost a lot of weight and has failed most MCAS treatments.

Dr. Pace proposed that an immune-mediated activation of the autonomic nerves in the gut could be producing her symptoms. The ideal – not easy to do – would be to do deep gut tissue immune profiling and look for autoantibodies. She noted that new autoantibodies such as FGR3 are being identified for systemic pain syndromes.

Small Fiber Neuropathy in the Gut

Dr. Pace’s response regarding problems with the autonomic nerves of the gut brought up the issue, at least in my mind, of small nerve fiber neuropathy (SFN). Small nerve fiber neuropathy is found in the skin and eye – why not the gut or other places? Unfortunately, no one asked about the role small fiber neuropathy may be playing in the mysterious gut symptoms found in many people with IBS, ME/CFS, long COVID, etc.

The problem is that assessing small nerve fiber neuropathy in the gut is difficult “because the nerve plexus of interest lies deep within the muscular layer of the gut, where full-thickness biopsies carry a risk of life-threatening complications such as strictures, perforation, and infection.”

SFN in the gut may be present, though. In a recent case study of a woman with recurrent nausea, vomiting, and fainting episodes who had been diagnosed with postural orthostatic tachycardia syndrome (POTS), small fiber neuropathy (SFN), and impaired gastrointestinal (GI) motility, the authors wrote that “given the current literature and our patient’s history, our central hypothesis is that the small fiber neuropathy contributed to gut immune dysfunction and impaired barrier integrity, leading to increased susceptibility to GI-mediated bacterial infections.”

An SFN in the gut might not be a bad thing to have. The encouraging thing about SFN is that if the cause be identified and fixed, the small nerve fibers can regrow…

Probiotics and Prebiotics

It was not surprising to learn that Dr. Pace is not a fan of probiotics and prebiotics either. Why inoculate the small intestine with bacteria associated with the colon? Hundreds of millions of dollars have probably been wasted, in her opinion – by looking at the wrong compartment. She felt that altering the microbiota without ways to track it was “dangerous” and could lead to longer-term problems. Until we know what’s happening in the small intestine, we shouldn’t do anything to modify it.

Dr. Pace is not alone on this. About five years ago a couple of Israeli studies showed that the gut flora in the colon and small intestine differs dramatically and that a person’s response to probiotics depends on the makeup of their flora and the status of their immune system. While some people did respond well to probiotics people with an autoimmune trending immune system failed to.

The studies also demonstrated that wiping out the gut with antibiotics and then replenishing it with probiotics was the least effective way to produce better gut flora. It was actually more effective to leave the gut alone after using antibiotics than attempting to build a better gut flora with probiotics.

The Probiotic Paradox: Why Probiotics May Fail or Even Do Harm – an ME/CFS Perspective

Dr. Pace suggested focusing on a healthy diet that reduces processed foods, additives, and emulsifiers – all of which have been associated with gut problems.

Fecal Transplants

Ditto. You see the pattern emerging. Why populate the small intestine with bacteria from the stool? In infections like C. difficle, where you need to overwhelm the bad bacteria, fecal transplants are fine – otherwise no.

One study which consisted mostly of case reports suggested that fecal transplants may help some people with ME/CFS.

The First ME/CFS Fecal Transplant Study Suggests the Treatment Holds Promise

Several fecal transplant studies are currently underway in ME/CFS. Find out more about fecal transplants in IBS and ME/CFS below.

Fecal Transplants – Do They Work? An IBS / Chronic Fatigue Syndrome (ME/CFS) Perspective

Histamine from Foods vs Histamine From Mast Cells

A doctor noted that a lot of his patients are having pretty good responses to diamine oxidase, which is designed to reduce histamine production from foods. He asked if there was a difference between that and the histamine that is produced by a mast cell in the gut.

Pace said these are entirely separate processes. The histamine ingested from food hits receptors on cells that are meant to receive histamine from the gut. At best, that only produces very local effects. Histamine coming from the mast cells in gut tissues that are in close approximation to nerve fibers, on the other hand, can start a systemic cascade of mast cell and immune effects.

Empiric Therapies (Diet, Mast Cells, Gut Motility)

In the absence of specialized testing, what to do? Besides better diets, she suggested removing obvious food triggers – or obvious combinations of foods – that produce symptoms.

There’s also no harm in starting a trial of mast cell-targeted medication. She employs an H2 blocker 2-3x day, and oral Cromolyn 4x daily. Some people have problems tolerating Cromolyn, but she usually gets it to work. Patients should remember to slowly titrate it up as it can cause significant mast degradation (and produce lots of symptoms) if increased too quickly. She does not require that it be taken with or without meals but spaces it throughout the day.

She uses quercetin if Cromolyn doesn’t work, as she knows what’s in Cromolyn; not so much with plant-derived quercetin. She also uses leukotriene receptor antagonists. Her go-to motility drug is pyridostigmine, and then later she may add on Motegrity.

Check out the Metrodora Institute which Pace cofounded (and later left).

Metrodora – a High-Tech Clinical / Research Center for ME/CFS, FM, Long COVID, POTS – Opens

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This was a challenging blog as Dr. Pace put thumbs down on some of the gut treatments that people with these diseases try. Dr. Pace, though, is a well-published doctor and researcher who brings a new slant to these diseases and new slants are definitely needed. That’s why this blog featured her. If that’s the kind of focus you want, please support Health Rising in a way that’s appropriate for you.

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