Human B-cell memory is shaped by age- and tissue-specific T-independent and GC-dependent events

Alaitz Aranburu, Eva Piano Mortari, Anwar Baban, Ezio Giorda, Simona Cascioli, Valentina Marcellini, Marco Scarsella, Sara Ceccarelli, Sandro Corbelli, Nicoletta Cantarutti, Rita De Vito, Alessandro Inserra, Luciana Nicolosi, Arnalda Lanfranchi, Fulvio Porta, Caterina Cancrini, Andrea Finocchi, Rita Carsetti

Research output: Contribution to journalArticlepeer-review


Switched and IgM memory B cells execute different and noninterchangeable functions. We studied memory B cells in children of different ages, in peripheral blood and spleen and compared them with those of children born asplenic or unable to build germinal centers. We show that, whereas switched memory B cells are mostly generated in the germinal centers at all ages, IgM memory B cells can be distinct in three types with different developmental history. Innate IgM memory B cells, the largest pool in infants, are generated in the spleen by a germinal center-independent mechanism. With age, if the spleen is present and germinal centers are functional, innate IgM memory B cells are remodelled and accumulate somatic mutations. The third type of IgM memory B cell is a by-product of the germinal center reaction. Our data suggest that the B-cell memory developmental program is implemented during the first 5-6 years of life.

Original languageEnglish
JournalEuropean Journal of Immunology
Publication statusAccepted/In press - 2016


  • Antibodies
  • B cell development
  • B cells
  • Immunoglobulins
  • Innate immunity

ASJC Scopus subject areas

  • Immunology and Allergy
  • Immunology


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