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Allergic Disease on the Rise

Increase in rate of allergic asthma

Allergic diseases are on the rise. Specifically, allergic asthma in children, which has become the number one chronic illness in Canada. It is also a major cause of children being hospitalized. Dr. Irah King, of the Meakins-Christie Laboratories, is a co-author on a recent Nature Immunology publication on the topic. Understanding the increasing rate of allergic asthma is the first step towards preventing or finding a cure.

The leading theory is known as “The Hygiene Hypothesis” – that due to regular use of antibiotics and disinfectants, people are less exposed to microorganisms that would normally train our immune system to be more tolerant. To exacerbate the lowered immune response, our exposure to substances in our environment, such as surfactants in detergent, may induce cell death. These compounds are harmful to barrier surfaces such as the intestines and lungs and may additionally prime our immune system to generate allergic, type-2 responses. 

The study focuses on type-2 immunity, which is driven by Th2 cells and associated with responses to allergens, parasitic worms, and toxins. Researchers found that loss-of-function mutations in the DOCK8 gene, which causes immune cell migration defects, lead to cell death during tissue traversal. This cell death signals the immune system to mount a type-2 response, contributing to allergic diseases. Using a mouse model, they demonstrated that even introducing dying cells in healthy mice could skew the immune response toward type-2 immunity.

The findings highlight cell death as a key driver of type-2 responses, offering new insights into allergic disease mechanisms. Researchers aim to identify the specific signals from dying cells that trigger these responses and further investigate the role of DOCK8 in immune cell migration. This work may pave the way for more effective preventative and curative treatments for allergies.

Read about the study:

Schneider C, Shen C, Gopal AA, Douglas T, Forestell B, Kauffman KD, Rogers D, Artusa P, Zhang Q, Jing H, Freeman AF, Barber DL, King IL, Saleh M, Wiseman PW, Su HC, Mandl JN. Migration-induced cell shattering due to DOCK8 deficiency causes a type 2–biased helper T cell response. Nat Immunol. 2020 Oct 5. doi: 10.1038/s41590-020-0795-1.

Read more here:

A possible link between cell death and allergic disease. McGill Health e-News. Oct 6, 2020.