TLR7 influences germinal center selection in murine SLE

Alexis Boneparth, Weiqing Huang, Ramalingam Bethunaickan, Megan Woods, Ranjit Sahu, Shitij Arora, Meredith Akerman, Martin Lesser, Anne Davidson

Research output: Contribution to journalArticle

13 Scopus citations

Abstract

TLR7 enhances germinal center maturation and migration of B cells to the dark zone where proliferation and somatic hypermutation occur. Our goal was to determine how Tlr7 dose influences selection of the autoreactive B cell repertoire in NZW/BXSB. Yaa mice bearing the site-directed heavy chain transgene 3H9 that encodes for the TLR7 regulated anti-CL response. To create a physiologic setting in which autoreactive B cells compete for survival with non-autoreactive B cells, we generated bone marrow chimeras in which disease onset occurred with similar kinetics and the transferred 3H9+ female non- Yaa, male Yaa or male TLR7 -/Yaa cells could be easily identified by positivity for GFP. Deletion of 3H9 B cells occurred in the bone marrow and the remaining 3H9 follicular B cells manifested a decrease in surface IgM. Although there were differences in the naïve repertoire between the chimeras it was not possible to distinguish a clear pattern of selection against lupus related autoreactivity in TLR7-/Yaa or female chimeras. By contrast, preferential expansion of 3H9+ B cells occurred in the germinal centers of male Yaa chimeras. In addition, although all chimeras preferentially selected 3H9/Vê5 encoded B cells into the germinal center and plasma cell compartments, 3H9 male Yaa chimeras had a more diverse repertoire and positively selected the 3H9/V ê5-48/Jê4 pair that confers high affinity anti-cardiolipin activity. We were unable to demonstrate a consistent effect of Tlr7 dose or Yaa on somatic mutations. Our data show that TLR7 excess influences the selection, expansion and diversification of B cells in the germinal center, independent of other genes in the Yaa locus.

Original languageEnglish (US)
Article numbere0119925
JournalPloS one
Volume10
Issue number3
DOIs
StatePublished - Mar 20 2015
Externally publishedYes

ASJC Scopus subject areas

  • Biochemistry, Genetics and Molecular Biology(all)
  • Agricultural and Biological Sciences(all)
  • General

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    Boneparth, A., Huang, W., Bethunaickan, R., Woods, M., Sahu, R., Arora, S., Akerman, M., Lesser, M., & Davidson, A. (2015). TLR7 influences germinal center selection in murine SLE. PloS one, 10(3), [e0119925]. https://doi.org/10.1371/journal.pone.0119925