Abstract
The innate immune response provides a first line of defense against common microorganisms and, for more complex and/or recurring situations where pathogens must be eliminated, an adaptive immune response has emerged and evolved to provide better protection against subsequent infections. However, such dichotomy has to be reevaluated because innate B cells (e.g., B1 and marginal zone B cells) and the newly described innate lymphoid cells (iLC) have been found to exhibit innate-like properties, such as antigen internalization, regulatory B cell functions, and helper T cell activities. In addition, the production and function of natural antibodies (nAbs) by innate B cells and their capacity to activate the classical complement pathway constitute additional important mechanisms at the junction of innate and adaptive immunity as well as the recent integration of platelets into the innate immune spectrum. There is no doubt that these mechanisms present an advantage in immunity and homeostasis particularly during the first years of life, but arguments are arising to consider that these precursors may have detrimental effects in a variety of autoimmune/inflammatory diseases, allergies and cancers, as well as in response to immunotherapy. Accordingly, and as presented in this special issue of Clinical Reviews in Allergy and Immunology, a better comprehension of the key molecular and cellular actors implicated at the crossroads of the innate and adaptive immune response represents a new challenge in our understanding of the immunological and immunopathological responses.
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Acknowledgments
We are thankful to Genevieve Michel for secretarial help.
Funding
This study was supported by research funding from the “Russian Science Foundation” (No. 17-15-01099), the “Association Française de Gougerot Sjögren et des syndromes secs,” the “Ligue against cancer,” the Brittany region, and the Brest University Hospital INNOVEO donation fund.
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Hillion, S., Arleevskaya, M.I., Blanco, P. et al. The Innate Part of the Adaptive Immune System. Clinic Rev Allerg Immunol 58, 151–154 (2020). https://doi.org/10.1007/s12016-019-08740-1
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DOI: https://doi.org/10.1007/s12016-019-08740-1