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COVID-19 is a recently emerged infectious disease caused by the novel coronavirus SARS-CoV-2. The immune system has a primary role in pathogen elimination and a rapid and effective response can limit disease severity. In this context, T cells play the major role in cell mediated adaptive immune response. The protective role of CD4+ and CD8+ T cells has been inferred from studies on patients who recovered from SARS and MERS and accumulating data are now showing their relevance in SARS-CoV-2 infection. Moreover, memory T cells induced by previous pathogens can shape the susceptibility to, and the clinical severity of other infections, but the complete picture has yet to be elucidated. If the virus is not rapidly eliminated, COVID-19 may progress towards a secondary inflammatory phase that is directly responsible for a worsening in clinical symptoms and immune system impairment. Besides marked lymphopenia, COVID-19 patients’ T cell compartment displays several alterations involving different subpopulations of T cells in terms of phenotype, metabolic profile and functionality.
This monograph, for the first time, presents a comprehensive overview of different mechanisms of immune dysfunction in cancer as well as therapeutic approaches to their correction. It discusses a number of new mechanisms that have never been discussed in a monograph before: T-cell inhibitory molecules, regulatory tolerogenic DCs, and signaling pathways in antigen-presenting cells involved in T-cell tolerance. There is now a pressing need to discuss the already described and newly emerging mechanisms to see how they can be put together in a more or less cohesive structure and how they can help to improve immune response to tumors.
This eBook is a collection of articles from a Frontiers Research Topic. Frontiers Research Topics are very popular trademarks of the Frontiers Journals Series: they are collections of at least ten articles, all centered on a particular subject. With their unique mix of varied contributions from Original Research to Review Articles, Frontiers Research Topics unify the most influential researchers, the latest key findings and historical advances in a hot research area! Find out more on how to host your own Frontiers Research Topic or contribute to one as an author by contacting the Frontiers Editorial Office: frontiersin.org/about/contact.
This volume presents a collection of reviews derived from work presented at the Aegean Conference: “5th Crossroads Between Innate and Adaptive Immunity”. This meeting was the fifth in a series, and assembled a team of scientists working on mechanisms by which the innate immune system of the host senses pathogens, the cellular and signaling networks that orchestrate the innate response and antigen presentation and adaptive immunity. The importance of the crosstalk between innate immunity and the adaptive immune response has only recently started to be appreciated. Although it is well recognized that dendritic cells, NK cells, NK-T cells and T cells are all critical for the host response t...