Macrophages Control the Retention and Trafficking of B Lymphocytes in the Splenic Marginal Zone

边缘地带 布鲁顿酪氨酸激酶 红浆 脾脏 生物 细胞生物学 B细胞 信号转导 免疫学 酪氨酸激酶 抗体
作者
Mikael C. I. Karlsson,Rodolphe Guinamard,Silvia Bolland,Marko Sankala,Ralph M. Steinman,Jeffrey V. Ravetch
出处
期刊:Journal of Experimental Medicine [The Rockefeller University Press]
卷期号:198 (2): 333-340 被引量:232
标识
DOI:10.1084/jem.20030684
摘要

The marginal zone of the spleen is a precisely ordered region that contains specialized subsets of B lymphocytes and macrophages. Disruption of the negative signaling inositol phosphatase, SH2-containing inositol-5-phosphatase 1 (SHIP), results in the loss of marginal zone B cells (MZBs) with reorganization of marginal zone macrophages (MZMOs) to the red pulp of the spleen. This primary macrophage defect, as revealed by selectively depleting SHIP in myeloid cells shows that MZMOs are specifically required for the retention of MZBs. The MZMO phenotype was reverted in SHIP/Bruton's tyrosine kinase (Btk) double knockout mice, thus identifying the Btk activating pathway as an essential component being regulated by SHIP. Furthermore, we identified a direct interaction between the MARCO scavenger receptor on MZMOs and MZBs. Activation or disruption of this interaction results in MZB migration to the follicle. The migration of the MZMOs was further studied after the response to Staphylococcus aureus, which induced MZMOs to move into the red pulp while MZBs migrated into the follicular zone. The marginal zone is therefore a dynamic structure in which retention and trafficking of B cells requires specific macrophage–B cell interactions.
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