1
|
Zhang J, Shehabeldin A, da Cruz LA, Butler J, Somani AK, McGavin M, Kozieradzki I, dos Santos AO, Nagy A, Grinstein S, Penninger JM, Siminovitch KA. Antigen receptor-induced activation and cytoskeletal rearrangement are impaired in Wiskott-Aldrich syndrome protein-deficient lymphocytes. J Exp Med 1999; 190:1329-42. [PMID: 10544204 PMCID: PMC2195687 DOI: 10.1084/jem.190.9.1329] [Citation(s) in RCA: 290] [Impact Index Per Article: 11.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022] Open
Abstract
The Wiskott-Aldrich syndrome protein (WASp) has been implicated in modulation of lymphocyte activation and cytoskeletal reorganization. To address the mechanisms whereby WASp subserves such functions, we have examined WASp roles in lymphocyte development and activation using mice carrying a WAS null allele (WAS(-)(/)(-)). Enumeration of hemopoietic cells in these animals revealed total numbers of thymocytes, peripheral B and T lymphocytes, and platelets to be significantly diminished relative to wild-type mice. In the thymus, this abnormality was associated with impaired progression from the CD44(-)CD25(+) to the CD44(-)CD25(-) stage of differentiation. WASp-deficient thymocytes and T cells also exhibited impaired proliferation and interleukin (IL)-2 production in response to T cell antigen receptor (TCR) stimulation, but proliferated normally in response to phorbol ester/ionomycin. This defect in TCR signaling was associated with a reduction in TCR-evoked upregulation of the early activation marker CD69 and in TCR-triggered apoptosis. While induction of TCR-zeta, ZAP70, and total protein tyrosine phosphorylation as well as mitogen-activated protein kinase (MAPK) and stress-activated protein/c-Jun NH(2)-terminal kinase (SAPK/JNK) activation appeared normal in TCR-stimulated WAS(-)(/)(-) cells, TCR-evoked increases in intracellular calcium concentration were decreased in WASp-deficient relative to wild-type cells. WAS(-)(/)(-) lymphocytes also manifested a marked reduction in actin polymerization and both antigen receptor capping and endocytosis after TCR stimulation, whereas WAS(-)(/)(-) neutrophils exhibited reduced phagocytic activity. Together, these results provide evidence of roles for WASp in driving lymphocyte development, as well as in the translation of antigen receptor stimulation to proliferative or apoptotic responses, cytokine production, and cytoskeletal rearrangement. The data also reveal a role for WASp in modulating endocytosis and phagocytosis and, accordingly, suggest that the immune deficit conferred by WASp deficiency reflects the disruption of a broad range of cellular behaviors.
Collapse
Affiliation(s)
- Jinyi Zhang
- Department of Medicine, University of Toronto, Ontario, Canada M5G 1X5
- Department of Immunology, University of Toronto, Ontario, Canada M5G 1X5
- Department of Medical Genetics and Microbiology, University of Toronto, Ontario, Canada M5G 1X5
- Samuel Lunenfeld Research Institute, Mount Sinai Hospital, Toronto, Ontario, Canada M5G 1X5
| | - Amro Shehabeldin
- Department of Medicine, University of Toronto, Ontario, Canada M5G 1X5
- Department of Immunology, University of Toronto, Ontario, Canada M5G 1X5
- Department of Medical Genetics and Microbiology, University of Toronto, Ontario, Canada M5G 1X5
- Samuel Lunenfeld Research Institute, Mount Sinai Hospital, Toronto, Ontario, Canada M5G 1X5
| | - Luis A.G. da Cruz
- Department of Medicine, University of Toronto, Ontario, Canada M5G 1X5
- Department of Immunology, University of Toronto, Ontario, Canada M5G 1X5
- Department of Medical Genetics and Microbiology, University of Toronto, Ontario, Canada M5G 1X5
- Samuel Lunenfeld Research Institute, Mount Sinai Hospital, Toronto, Ontario, Canada M5G 1X5
| | - Jeffrey Butler
- Department of Biochemistry, University of Toronto, Ontario, Canada M5G 1X5
- Division of Cell Biology, Research Institute, Hospital for Sick Children
| | - Ally-Khan Somani
- Department of Medicine, University of Toronto, Ontario, Canada M5G 1X5
- Department of Immunology, University of Toronto, Ontario, Canada M5G 1X5
- Department of Medical Genetics and Microbiology, University of Toronto, Ontario, Canada M5G 1X5
- Samuel Lunenfeld Research Institute, Mount Sinai Hospital, Toronto, Ontario, Canada M5G 1X5
| | - Mary McGavin
- Department of Medicine, University of Toronto, Ontario, Canada M5G 1X5
- Department of Immunology, University of Toronto, Ontario, Canada M5G 1X5
- Department of Medical Genetics and Microbiology, University of Toronto, Ontario, Canada M5G 1X5
- Samuel Lunenfeld Research Institute, Mount Sinai Hospital, Toronto, Ontario, Canada M5G 1X5
| | - Ivona Kozieradzki
- Department of Immunology, University of Toronto, Ontario, Canada M5G 1X5
- Department of Medical Biophysics, University of Toronto, Ontario, Canada M5G 1X5
- Amgen Institute, Ontario Cancer Institute, Toronto, Ontario, Canada M5G 2C1
| | - Antonio O. dos Santos
- Department of Immunology, University of Toronto, Ontario, Canada M5G 1X5
- Department of Medical Biophysics, University of Toronto, Ontario, Canada M5G 1X5
- Amgen Institute, Ontario Cancer Institute, Toronto, Ontario, Canada M5G 2C1
| | - Andras Nagy
- Department of Medical Genetics and Microbiology, University of Toronto, Ontario, Canada M5G 1X5
- Samuel Lunenfeld Research Institute, Mount Sinai Hospital, Toronto, Ontario, Canada M5G 1X5
| | - Sergio Grinstein
- Department of Biochemistry, University of Toronto, Ontario, Canada M5G 1X5
- Division of Cell Biology, Research Institute, Hospital for Sick Children
| | - Josef M. Penninger
- Department of Immunology, University of Toronto, Ontario, Canada M5G 1X5
- Department of Medical Biophysics, University of Toronto, Ontario, Canada M5G 1X5
- Amgen Institute, Ontario Cancer Institute, Toronto, Ontario, Canada M5G 2C1
| | - Katherine A. Siminovitch
- Department of Medicine, University of Toronto, Ontario, Canada M5G 1X5
- Department of Immunology, University of Toronto, Ontario, Canada M5G 1X5
- Department of Medical Genetics and Microbiology, University of Toronto, Ontario, Canada M5G 1X5
- Samuel Lunenfeld Research Institute, Mount Sinai Hospital, Toronto, Ontario, Canada M5G 1X5
| |
Collapse
|