Abstract
Abstract Shp-1 and Shp-2 are cytoplasmic phosphotyrosine phosphatases with similar structures. Mice deficient in Shp-2 die at midgestation with defects in mesodermal patterning, and a hypomorphic mutation at the Shp-1 locus results in the moth-eaten viable (mev) phenotype. Previously, a critical role of Shp-2 in mediating erythroid/myeloid cell development was demonstrated. By using the RAG-2–deficient blastocyst complementation, the role of Shp-2 in lymphopoiesis has been determined. Chimeric mice generated by injecting Shp-2−/− embryonic stem cells into Rag-2–deficient blastocysts had no detectable mature T and B cells, serum immunoglobulin M, or even Thy-1+ and B220+ precursor lymphocytes. Collectively, these results suggest a positive role of Shp-2 in the development of all blood cell lineages, in contrast to the negative effect of Shp-1 in this process. To determine whether Shp-1 and Shp-2 interact in hematopoiesis, Shp-2−/−:mev/mev double-mutant embryos were generated and the hematopoietic cell development in the yolk sacs was examined. More hematopoietic stem/progenitor cells were detected in Shp-2−/−:mev/mevembryos than in Shp-2−/− littermates. The partial rescue by Shp-1 deficiency of the defective hematopoiesis caused by the Shp-2 mutation suggests that Shp-1 and Shp-2 have antagonistic effects in hematopoiesis, possibly through a bidirectional modulation of the same signaling pathway(s).
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Dates
Type | When |
---|---|
Created | 23 years, 1 month ago (July 27, 2002, 4:46 a.m.) |
Deposited | 5 years, 6 months ago (Feb. 12, 2020, 12:46 p.m.) |
Indexed | 11 months, 2 weeks ago (Sept. 20, 2024, 11:11 a.m.) |
Issued | 24 years, 6 months ago (Feb. 15, 2001) |
Published | 24 years, 6 months ago (Feb. 15, 2001) |
Published Print | 24 years, 6 months ago (Feb. 15, 2001) |
@article{Qu_2001, title={Requirement of Shp-2 tyrosine phosphatase in lymphoid and hematopoietic cell development}, volume={97}, ISSN={0006-4971}, url={http://dx.doi.org/10.1182/blood.v97.4.911}, DOI={10.1182/blood.v97.4.911}, number={4}, journal={Blood}, publisher={American Society of Hematology}, author={Qu, Cheng-Kui and Nguyen, Suzanne and Chen, Jianzhu and Feng, Gen-Sheng}, year={2001}, month=feb, pages={911–914} }