The Journal of Experimental Medicine
Symposium on Dendritic Cells
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© The Rockefeller University Press, 0022-1007/1999/9/681/ $5.00
The Journal of Experimental Medicine, Volume 190, Number 5, September 6, 1999 681-690

Abnormal Chemokine-induced Responses of Immature and Mature Hematopoietic Cells from Motheaten Mice Implicate the Protein Tyrosine Phosphatase SHP-1 in Chemokine Responses

Chang H. Kima,b,d,e, Cheng-Kui Quc,d,e, Giao Hangoca,b,d,e, Scott Coopera,b,d,e, Naoyuki Anzaia,b,d,e, Gen-Sheng Fengc,d,e, and Hal E. Broxmeyera,b,d,e
a From the Department of Microbiology/Immunology, Indiana University School of Medicine, Indianapolis, Indiana 46202
b From the Department of Medicine, Indiana University School of Medicine, Indianapolis, Indiana 46202
c From the Department of Biochemistry/Molecular Biology, Indiana University School of Medicine, Indianapolis, Indiana 46202
d From the Walther Oncology Center, Indiana University School of Medicine, Indianapolis, Indiana 46202
e Walther Cancer Institute, Indianapolis, Indiana 46208

Correspondence to: Hal E. Broxmeyer, Department of Microbiology/Immunology and the Walther Oncology Center, Indiana University School of Medicine, Bldg. R4, Rm. 302, 1044 West Walnut St., Indianapolis, IN 46202. Tel:317-274-7510 Fax:317-274-7592 E-mail:hbroxmey{at}iupui.edu.

Chemokines regulate a number of biological processes, including trafficking of diverse leukocytes and proliferation of myeloid progenitor cells. SHP-1 (Src homology 2 domain tyrosine phosphatase 1), a phosphotyrosine phosphatase, is considered an important regulator of signaling for a number of cytokine receptors. Since specific tyrosine phosphorylation of proteins is important for biological activities induced by chemokines, we examined the role of SHP-1 in functions of chemokines using viable motheaten (mev/mev) mice that were deficient in SHP-1. Chemotactic responses to stromal call–derived factor 1 (SDF-1), a CXC chemokine, were enhanced with bone marrow myeloid progenitor cells as well as macrophages, T cells, and B cells from mev/mev versus wild-type (+/+) mice. SDF-1–dependent actin polymerization and activation of mitogen-activated protein kinases were also greater in mev/mev versus +/+ cells. In contrast, immature subsets of mev/mev bone marrow myeloid progenitors were resistant to effects of a number of chemokines that suppressed proliferation of +/+ progenitors. These altered chemokine responses did not appear to be due to enhanced expression of CXCR4 or lack of chemokine receptor expression. However, expression of some chemokine receptors (CCR1, CCR2, CCR3, and CXCR2) was significantly enhanced in mev/mev T cells. Our results implicate SHP-1 involvement in a number of different chemokine-induced biological activities.

Key Words: chemokine, Src homology 2 domain tyrosine phosphatase 1, viable motheaten mice, chemotaxis, myelosuppression, stromal cell–derived factor 1


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