Emerging Functions of IL-33 in Homeostasis and Immunity

Our understanding of the functions of the IL-1 superfamily cytokine and damage-associated molecular pattern IL-33 continues to evolve with our understanding of homeostasis and immunity. The early findings that IL-33 is a potent driver of type 2 immune responses promoting parasite expulsion, but also inflammatory diseases like allergy and asthma, have been further supported. Yet, as the importance of a type 2 response in tissue repair and homeostasis has emerged, so has the fundamental importance of IL-33 to these processes. In this review, we outline an evolving understanding of IL-33 immunobiology, paying particular attention to how IL-33 directs a network of ST2+ regulatory T cells, reparative and regulatory macrophages, and type 2 innate lymphoid cells that are fundamental to tissue development, homeostasis, and repair. Expected final online publication date for the Annual Review of Immunology, Volume 40 is April 2022. Please see http://www.annualreviews.org/page/journal/pubdates for revised estimates.

Editorial of Special Issue “Molecular Mechanisms of Allergy and Asthma”

This Special Issue aggregates several high-quality original articles written by renowned researchers [...]

Post-Coronavirus Era: Should We Expect a Surge in Allergic Diseases and Asthma?

Some infectious agents by priming the immune system promote protection against allergy and asthma. During infections, Th1 immune responses are dominant, while in allergic conditions, Th2 responses are more pronounced. Th1 immune response protects the body against infections, and Th2 response leads to allergy and asthma. For maintaining health, the balance between Th1 and Th2 responses is necessary. The COVID-19 infection augments Th1 and also eosinophilic responses. On the other hand, the main protocols to control the COVID-19 pandemic require adherence to health standards, maintaining personal hygiene, frequent disinfecting of hands, using face masks, etc. In the post-COVID-19 era, this sterile condition may relinquish, and the Th1/Th2 immune imbalance may lead to an increase in the incidence of allergy and asthma. Therefore, focus on the COVID-19 infection should not deter us from foreseeing a surge in asthma and other post-coronavirus problems.