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TOPIC: Before the Villi are Gone
Before the Villi are Gone 05 Sep 2008 11:46 #548
Early Diagnosis of Gluten Sensitivity: Before the Villi are Gone by By Kenneth Fine, M.D.
This article originally appeared in the Winter 2004 edition of Celiac.com's Scott-Free Newsletter . Transcript of a talk given by Kenneth Fine, M.D. to the Greater Louisville Celiac Sprue Support Groupâ€“â€“transcribed by Marge Johannemann; Edited by Kelly Vogt.
More proof that patients in these studies were gluten sensitive came from the fact that they all got better on a gluten-free diet, and developed recurrent symptoms when â€œchallengedâ€ with gluten. Although the gluten-sensitive patients in these studies did not have the villous atrophy that would yield a diagnosis of celiac disease, small bowel biopsies in many of them showed some, albeit minimal, inflammatory abnormalities. Yet, when a symptomatic patient in clinical practice is biopsied and found to have only minimal abnormalities on small bowel biopsy, clinicians do not put any stock in the possibility of their having gluten sensitivity. As much as I would like to take credit for the concept, you can see from these studies that I did not invent the idea that not all gluten sensitive patients have villous atrophy. It has been around for at least 23 years, and reported from different parts of the world.
Despite the common sense and research evidence that early diagnosis of gluten sensitivity offers many health advantages over a diagnostic scheme that can only detect the minority and end-stage patients, until now, the limitation was still in the tests being employed. As mentioned above, the main tests used for primary (before symptoms develop) and secondary (after symptoms develop) screening for celiac disease, blood tests for antigliadin and antiendomysial/anti-tissue transglutaminase antibodies, are only routinely positive after extensive damage to intestinal villi. As shown in a 1990 publication, this is because unless you have full blown, untreated celiac disease, the IgA antibodies to gliadin are only INSIDE the intestine not in the blood. Measuring antigliadin antibody in blood and intestinal fluid (obtained by the laborious technique of having research subjects swallow a long tube that migrates into the upper small intestine), researchers found that in untreated celiacs, antigliadin antibody was present in the blood and inside the intestine, whereas after villous atrophy healed following a year on a gluten-free diet, the antigliadin antibody was no longer in the blood but was still measurable inside the intestine in those with ongoing mild inflammation.
Why is this so important? Because some people with microscopic colitis never get better when theyâ€™re treated, and most autoimmune syndromes only progress with time, requiring harsh and sometimes dangerous immunosuppressive drugs just for disease control. If the immune reaction to gluten is in any way at the cause of these diseases as research suggests, and if we had at our disposal a sensitive test that can diagnose this gluten sensitivity without having to wait for the intestinal villi to be damaged, then treatment with a gluten free diet might allow the affected tissues to return to normal or at least prevent progression. We now have that test in fecal antigliadin antibody. Just a few weeks ago we completed the first follow-up phase of our study: What happens when a gluten sensitive person without villous atrophy goes on a gluten-free diet for one or two years. While I am still gathering and analyzing the data, most of the subjects reported a much improved clinical status (utilizing an objective measure of symptoms and well being). Not everybody gets well, because sadly not everyone stays on a gluten-free diet (as they sometimes admit on the surveys). Some people have the misconception that if they donâ€™t have celiac disease, but â€œI just have gluten sensitivityâ€ then maybe they do not have to be strict with their gluten elimination diet. I do not think that is the case. Although a gluten free diet is like anything: Less gluten is not as damaging as more gluten, but certainly no gluten is optimal if a gluten sensitive person desires optimal health.
Thus, my approach (and I believe the most sensitive and most complete approach) for screening for early diagnosis and preventive diagnosis for clinically important gluten sensitivity is a stool test for antigliadin and anti-tissue transglutaminase IgA antibodies (IgG is not detectable in the intestine) and a malabsorption test. The malabsorption test we developed is special, because you no longer have to collect your stool for three days; we can find the same information with just one stool specimen. Stool testing in combination with HLA gene testing, which we do with a cotton-tipped swab rubbed inside the mouth, is the best diagnostic approach available for gluten sensitivity.
Historically, with respect to diagnostic methods for celiac disease, from 100 A.D., when celiac disease was first described as an emaciating, incapacitating, intestinal symptom-causing syndrome, to 1950, we had just one diagnostic test: Clinical observation for development of the end stage of the disease. Then in 1940 to 1960, when the discovery of gluten as the cause of celiac disease occurred, the best diagnostic test was removing gluten from the diet and watching for clinical improvement. It was during this period that the 72-hour fecal fat and D-xylose absorption tests were developed as measures of gluten-induced intestinal dysfunction/damage. In the mid- to late1950â€™s, various intestinal biopsy methods were pioneered and utilized, showing total villous atrophy as the diagnostic hallmark of celiac disease. Youâ€™ve heard the intestinal biopsy called the â€œgold standardâ€; well as you can see, it is a 50 year-old test, and thus, the â€œoldâ€ standard. It was not until the 1970â€™s and 80â€™s (and improved upon in the 1990â€™s) that blood tests for antigliadin and antiendomysial/anti-tissue transglutaminase were developed, but again these tests like all methods before, can reliably reveal only the â€œheart attackâ€ equivalent of the intestinal celiac syndrome: Significant villous atrophy or bad celiac disease.
We are in a new century, a new millennium, and I have built upon what my research predecessors have started; mostly on the work of researchers who laboriously put down tubes and sucked out intestinal fluid for testing for antigliadin antibody when it was not present in blood. We now know that a stool test for antigliadin antibody is just as good and much simpler. The wide-reaching ramifications of knowing that so many more people and patients are gluten sensitive than have ever been previously known has led me to assume a professional life of medical public service. To do so, I started a 501(c)3 not-for-profit institute called the Intestinal Health Institute, have brought these new diagnostic tests to the public on the internet (at http://www.enterolab.com ), and volunteer my time helping people with health problems by email and by lecturing. With greater awareness and education of both the public and medical community that early diagnosis of gluten sensitivity can be achieved before the villi are gone, more of the gluten sensitive iceberg will be diagnosed and treated early, leading to far fewer gluten-related symptoms and diseases than has ever been experienced before.
Dr. Fine has been an intestinal researcher and an academic and clinical gastroenterologist for 15 years. He is the Director of The Intestinal Health Institute and The www.EnteroLab.com Clinical Laboratory in Dallas Texas.
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