This is my thoughts.....
Firstly I have to agree with Buzznerd. I think the ALS caused the antibodies, not the other way around as suggested. I also think people should be made aware that abstaining from gluten for long periods can have consequenes which you should consider before commiting to such a decision. Let me explain.
Firstly to do with the original article. I understand this article is talking about gluten intolerance not CD specifically. However just for interest there have been a few studies done on relationship between celiac disease and ALS, and no link has ever been statistically found. ( link below).
In the study linked by BFSburger I think the ALS came before the generation of the antibodies, and I see articles like this appearing more often, as everyone wants a slice of the ice bucket challenge research money. In my view it is basically a paper based on cheap blood tests, poor immunology ( I.e. presence of antibodies is far from proof of pathology), and overextrapolated data.
The fact that transglutaminase 6 antibodies were found in the serum of some ALS patients is not unexpected. I think they are probably there due to the breakdown of the gut oral tolerance mechanisms, a breakdown due to the ALS effect on the gut itself.
Most ALS suffers will not have an intact GI tract, peristalsis is slowed, saliva concentrations are wrong, which in turn upsets digestion and inhibits the adequate breakdown of certain foods. This means the presence of undigested food ( complex proteins) within gut ( proteins that should have been broken down ). It also means the antinflammatory cytokines, normally rich in the gut such as IL- 10, TGF b etc etc do not accumulate at the correct concentrations and the inherently suppressive environment of the gut is lost.
In addition and importantly the muscles used in physical swallowing are impaired, so the feedback activation of all those immunoregulatory processes which prevent us reacting to harmless food proteins, can not be achieved. It doesn't even say if the patients were PEG fed which would bypass even more of the guts normal physiological processes.
Take home message is that you need proper integrity of the gut for correct immunotoletance, lose that as in ALS, lose your tolerance for certain food proteins. If they had checked for certain milk proteins as a control they would probably have discovered them also etc etc. They have done the minimum for publication though.
At the risk of giving a lecture in gut immunology and oral tolerance I do want to point out a few other things. Especially if considering gluten abstaining.
It is important to remember that the immune system doesn't just act against pathogens ( prime ). It also has an equal role in being tolerant to self ( called central tolerance ), and to non harmful antigens present in the food we eat and the air we breath ( called peripheral tolerance). The latter is mainly achieved in the lymph nodes draining the gut ( MLN). In fact the gut is the main site of education for the immune system to foreign food proteins. When the gut physiological processes breakdown ( as in ALS patients), you get loss of tolerance to certain proteins, peptides in gluten being one of the best known.
So why do I suggest to think hard before going gluten free......surely there is no harm in trying.....Well a few facts about oral tolerance to ingested food protein
1) It has to be learned, tolerance to harmless food group antigens is a process which occurs in the first few years of life. Our ability to become immunotolerant ( educated ) decreases significantly with age.
2) There is a misconception that the immune system just simply ignores food proteins....crap it recognises, and responds in a very active ongoing manner, same as if it were a food pathogen, but instead it produces regulatory T cells secreting anti inflammatory molecules, B cells secreting protective rather than pathological antibodies . Much of the allergy and autoimmune theories were written before all these immunotolerance mechanisms were known about. So when a certain cytokine or antibodies turn up in serum those with poor immunology knowledge stick with the old idea and contribute it to a pathological response, when it could be part of the regulatory response. For example a match gives a flame, the flame can give you heat, or it can be used to light a bomb. It is wrong therefore to say we have a match so we will be blown up.
3). When you get booster immunisations you activate your immunological memory. Take the tetanus vaccination, after 10 years the immunological memory wanes....so you boost it, give the immune system a reminder of what it molecularly looks like. Just as priming responses need boosted, importantly so does the regulatory arm of the immune system. Oral tolerance needs boosted by giving it a reminder, I.e. you are tolerant to gluten, abstain for too long your immune system forgets it is tolerant to it, forgets it is harmless food protein.
Remember the gut immunological memory is not long, ( unlike the tetanus 10 year boost in the periphery). The gut memory is much shorter. Look at norovirus, you are only immune for a few months after infection, then the immune system forgets it. Couple this to my previous point about increasing age decreasing ability to induce tolerance. There is the argument you may be too old to induce any oral tolerance that is lost through prolonged abstainment.
Put together there is always a risk ( as yet unquantified ), that if you abstain from gluten for a year etc then you will start to lose the immunological memory of it. The gut immune system begins to lose tolerance. As I said before the ability to educate the immune system via the oral route deteriorates with age.
What would this mean. Well if you abstain from gluten for a significant length of time then you must realise you may not be able to eat it again, reintroduction after a lengthy abstainment could make you react adversary to it. You could make yourself gluten sensitive by complete elimination, by deteriating immunological tolerance memory. This is a factor which plays into some hands of the huge lucrative market of gluten free products. I.e. ramming home a gluten free diet, which in turn can create a physiological response which generates people who are gluten sensitive and now actually do need their products.
I am not saying this to undermine what has clearly worked for some people, and I am not arguing against some of the systemic effects to some of the peptides involved. Clearly certain genotypes are more susceptibile. BFBurgers commitment to his diet has been effective for him, as I am sure it will some others. I enjoy his posts very much. However all I am saying is think about it before undergoing any extreme dietary changes for long periods of time. Make the decision in an educated way, not on a whim.
Hx
http://www.ncbi.nlm.nih.gov/pubmed/24708265