Journal
JOURNAL OF IMMUNOLOGY
Volume 174, Issue 9, Pages 5612-5619Publisher
AMER ASSOC IMMUNOLOGISTS
DOI: 10.4049/jimmunol.174.9.5612
Keywords
-
Categories
Funding
- NIAID NIH HHS [AI048674, R01 AI048674, AI056156] Funding Source: Medline
Ask authors/readers for more resources
The membrane-associated adaptor protein LAX is a linker for activation of T cells (LAT)-like molecule that is expressed in lymphoid tissues. Upon stimulation of T or B cells, it is phosphorylated and interacts with Grb2 and the p85 subunit of PI3K. LAX, however, is not capable of replacing LAT in the TCR signaling pathway. In this study we report that upon T or B cell activation, the LAX protein was up-regulated dramatically. Although disruption of the LAX gene by homologous recombination had no major impact on lymphocyte development, it caused a significant reduction in CD23 expression on mature B cells. Interestingly, naive LAX(-/-) mice had spontaneous germinal center formation. Compared with normal T and B cells, LAX(-/-) T and B cells were hyperresponsive and had enhanced calcium flux, protein tyrosine phosphorylation, MAPK and Akt activation, and cell survival upon engagement of the T or B. AgRs. Our data demonstrate that LAX functions as a negative regulator in lymphocyte signaling.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available