Colorized image of human bronchial cells (blue) infected with SARS-CoV-2 virus (orange). © Institut Pasteur. Image by Rémy Robinot, Mathieu Hubert, Vincent Michel, Olivier Schwartz & Lisa Chakrabarti, colors by Jean Marc Panaud
Teams from the Pitié-Salpêtrière AP-HP hospital, Sorbonne University, Inserm and the Pasteur Institute have carried out work to study the role that IgA-type antibodies play in the protection of body against Covid-19 in the mucous membranes, in particular respiratory. This work in press in Science Translational Medicine , and which is the subject of a pre-publication on Monday, December 7, 2020 on the website of the journal Science Translational Medicine , shows that the IgA antibody response plays a key role in neutralizing the early and particularly effective SARS-CoV-2 virus.
IgA-type antibodies play an essential role in the protection of the organism at the level of the mucous membranes, in particular respiratory. It therefore made sense to study this particular antibody response in patients infected with the SARS-CoV-2 virus. Researchers and clinicians affiliated with the CIMI Research Center (Sorbonne University and Inserm) in collaboration with several clinical departments of APHP-Sorbonne University and teams from the Institut Pasteur, show that the IgA response plays a key role in neutralizing the early and particularly effective SARS-CoV-2 virus.
Somewhat surprisingly, IgA antibodies are often even the first detectable virus specific antibodies. An unusual profile since immunological dogma wants the IgM response to be dominant when encountered with an unknown pathogen. The stimulation induced by the virus induces a very large expansion of young cells secreting IgA antibodies (plasmablasts) which circulate between the blood and the mucous membranes in which they are able to reside. However, this IgA antibody response is slowly declining, including in the saliva.
In conclusion, this work highlights the powerful protective nature of IgA. It raises the question of the possible role of secretory IgA in limiting the transmission of the virus.
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IgA dominates the early neutralizing antibody response to SARS-CoV-2
D. Sterlin, A. Mathian, M. Miyara, A. Mohr, F. Anna, L. Claër, P. Quentric, J. Fadlallah, H. Devilliers, P. Ghillani, C. Gunn, R. Hockett, S. Mudumba, A. Guihot, C-E. Luyt, J. Mayaux, A. Beurton, S. Fourati, T. Bruel, O. Schwartz, J-M. Lacorte, H. Yssel, C. Parizot, K. Dorgham, P. Charneau, Z. Amoura, G. Gorochov.
Science Translational Medicine, in press.