New Research, New Hope Part 3 #FARECon

Dr. Carrie Nagler and the Microbiome

Some Background Information

Gut Check: Exploring your Microbiome from Coursera.org. 

I took this course earlier this year at the recommendation of someone from the CHA FB group . It is now available to take at your own pace and I highly recommend it if you are interested in health. It did not focus only on allergies. One personal caveat - I felt like, at times, it glorified a primitive lifestyle, a modern take on the "noble savage." I have my own reservations about balance between modern life and health, but I do love my indoor plumbing.

The Missing Microbe (affiliate link)

I myself have not read this book, but have had it recommended from multiple sources so it has risen on my rather long to read pile. Dr. Nagler recommended it in her lecture and The Gut Check Course I recommended above also recommended it.

Dr. Nagler's Talk

She is currently working with mouse models. When they give antibiotics, not only are microbiotics eliminated, but the peanut IgE rises. So, this leads them to the question: what microbes are protecting the mice or keeping the IgE low?

In the lab, the make germ free mice and chose two broad groups of microbiotics to test: Bacteroides, which are associated with digested food, and Clostridia, which is associated with the epithelial surface. They have found that Clostridia protects against the allergic response.

But how? And how can they be used?

What they have found is that Clostridia makes the cytokine IL-22, which plays a role in regulating the epithelium. The epithelium makes a protective barrier and IL-22 regulates production of mucous, the ability of the epithelium to proliferate, and the natural antibiotics made by the body help to protect the epithelium. Basically, it helps control intestinal permeability.

So, they gave an oral food challenge to three different groups of mice: one untreated, one treated with antibiotics, one treated with antibiotics and with IL-22, and one treated with antibiotics and Clostridia. The mice treated with antibiotics had higher than normal levels of peanuts allergen in their bloodstream after a food challenge. Those levels continued to rise. But, those who were treated with IL-22 or Clostridia had the allergen blocked from their bloodstream.

She has been collaborating with a university in Italy on a study on cow's milk allergic children, both identifying if they have a different microbiome from non-allergic children (they do) and developing a formula to help them gain tolerance. When the children who used the tolerance inducing formula had their microbiome compared to those who did not, those who gained tolerance had also gained Clostridia in their microbiome.

The next step is a pre-clinical model, taking fecal material from healthy children and cow's milk allergic children and put them into germ free mice, sensitize them with cow's milk, and then introduce different candidate drugs. They have three possible drugs they will try: a Clostridia based live biotherapeutics (which is already approved for IBD), identify and test pre-biotic fibers to expand butyrate producing Clostridia in vivo, and encapsulate butyrate in nano-formulations for targeted delivery to different sites within the gut.

Questions She Answered

1. There is no probiotic on the market that has been tested for food allergies now. They are mostly based on Lactobacillus (yogurt). The best thing you can do now for your microbiome is to eat a high fiber diet.

2. Try to limit your antibiotic use: get cultures before prescriptions, don't use antibiotic soap, try to eat antibiotic free food, etc.

3. Fecal transplants are not recommended for food allergies. They have not been proven safe for this condition for a variety of reasons.

My Thoughts

Having a child who has had (but has been better since starting with Dr. Li) lifelong digestive problems, I had a personal interest in Dr. Nagler's talk. James is not currently taking any probiotics (see the answer #1 under "Questions She Answered," which was also similar to the information I learned in the Gut Check class). If he needed to take antibiotics, I would have him take probiotics for the course and for some time after.

I plan to follow this study (as well as the work of Mimi Tang) and feel very fortunate I was able to hear her speak. I will reiterate, considering the audience, I'm disappointed that none of the speakers presented currently available treatment options.