LRRK1 is critical in the regulation of B-cell responses and CARMA1-dependent NF-κB activation.

Abstract:

:B-cell receptor (BCR) signaling plays a critical role in B-cell activation and humoral immunity. In this study, we discovered a critical function of leucine-rich repeat kinase 1 (LRRK1) in BCR-mediated immune responses. Lrrk1(-/-) mice exhibited altered B1a-cell development and basal immunoglobulin production. In addition, these mice failed to produce IgG3 antibody in response to T cell-independent type 2 antigen due to defects in IgG3 class-switch recombination. Concomitantly, B cells lacking LRRK1 exhibited a profound defect in proliferation and survival upon BCR stimulation, which correlated with impaired BCR-mediated NF-κB activation and reduced expression of NF-κB target genes including Bcl-xL, cyclin D2, and NFATc1/αA. Furthermore, LRRK1 physically interacted and potently synergized with CARMA1 to enhance NF-κB activation. Our results reveal a critical role of LRRK1 in NF-κB signaling in B cells and the humoral immune response.

journal_name

Sci Rep

journal_title

Scientific reports

authors

Morimoto K,Baba Y,Shinohara H,Kang S,Nojima S,Kimura T,Ito D,Yoshida Y,Maeda Y,Sarashina-Kida H,Nishide M,Hosokawa T,Kato Y,Hayama Y,Kinehara Y,Okuno T,Takamatsu H,Hirano T,Shima Y,Narazaki M,Kurosaki T,Toyofuku

doi

10.1038/srep25738

subject

Has Abstract

pub_date

2016-05-11 00:00:00

pages

25738

issn

2045-2322

pii

srep25738

journal_volume

6

pub_type

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