生物
造血
下调和上调
细胞生物学
CD8型
受体
免疫学
干细胞
癌症研究
免疫系统
基因
遗传学
作者
Anne M. Verhagen,Carolyn A. de Graaf,Tracey M. Baldwin,Ankita Goradia,Janelle E. Collinge,Benjamin T. Kile,Donald Metcalf,Robyn Starr,Douglas J. Hilton
出处
期刊:Journal of Immunology
[American Association of Immunologists]
日期:2011-11-22
卷期号:188 (1): 122-134
被引量:13
标识
DOI:10.4049/jimmunol.1100942
摘要
The lamin B receptor (LBR) is a highly unusual inner nuclear membrane protein with multiple functions. Reduced levels are associated with decreased neutrophil lobularity, whereas complete absence of LBR results in severe skeletal dysplasia and in utero/perinatal lethality. We describe a mouse pedigree, Lym3, with normal bone marrow and thymic development but profound and progressive lymphopenia particularly within the T cell compartment. This defect arises from a point mutation within the Lbr gene with only trace mutant protein detectable in homozygotes, albeit sufficient for normal development. Reduced T cell homeostatic proliferative potential and life span in vivo were found to contribute to lymphopenia. To investigate the role of LBR in gene silencing in hematopoietic cells, we examined gene expression in wild-type and mutant lymph node CD8 T cells and bone marrow neutrophils. Although LBR deficiency had a very mild impact on gene expression overall, for common genes differentially expressed in both LBR-deficient CD8 T cells and neutrophils, gene upregulation prevailed, supporting a role for LBR in their suppression. In summary, this study demonstrates that LBR deficiency affects not only nuclear architecture but also proliferation, cell viability, and gene expression of hematopoietic cells.
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