PMID- 10602003 OWN - NLM STAT- MEDLINE DCOM- 20000104 LR - 20180420 IS - 0014-2980 (Print) IS - 0014-2980 (Linking) VI - 29 IP - 12 DP - 1999 Dec TI - CD45-associated protein is not essential for the regulation of antigen receptor-mediated signal transduction. PG - 3951-5 AB - CD45 is a transmembrane protein tyrosine phosphatase required for signaling through the T-and B-cell antigen receptors. In lymphocytes, CD45 interacts with CD45-associated protein (CD45AP), a 32 000 Mr phosphoprotein, through their respective transmembrane domains. To determine whether CD45AP affects the ability of CD45 to regulate antigen receptor signaling, CD45AP-deficient mice were generated. Thymocyte development was grossly normal. Moreover, the cellularity of the thymus and spleens were normal. CD45 expression on thymocytes and splenocytes, ascertained by flow cytometry, was comparable between CD45AP-deficient mice and littermate controls. In contrast to a previous report (Matsuda et al., J. Exp. Med. 1998 187: 1863 - 1870). CD45AP-deficient and normal thymocytes and splenocytes proliferated similarly in response to various mitogens or antigen receptor cross-linking. Furthermore, thymocyte CD45-associated p56(lck) kinase activity was similar between CD45AP-deficient and normal cells. We conclude that CD45AP is not essential for the regulation of Src-family kinase activity by CD45. FAU - Kung, C AU - Kung C AD - Howard Hughes Medical Institute, Department of Pathology and Molecular Microbiology, Washington University School of Medicine, St. Louis, MO 63110, USA. FAU - Okumura, M AU - Okumura M FAU - Seavitt, J R AU - Seavitt JR FAU - Noll, M E AU - Noll ME FAU - White, L S AU - White LS FAU - Pingel, J T AU - Pingel JT FAU - Thomas, M L AU - Thomas ML LA - eng GR - AI26363/AI/NIAID NIH HHS/United States PT - Journal Article PT - Research Support, Non-U.S. Gov't PT - Research Support, U.S. Gov't, P.H.S. PL - Germany TA - Eur J Immunol JT - European journal of immunology JID - 1273201 RN - 0 (Receptors, Antigen) RN - EC 2.7.10.2 (src-Family Kinases) RN - EC 3.1.3.48 (Leukocyte Common Antigens) SB - IM MH - Animals MH - B-Lymphocytes/*immunology MH - Gene Expression Regulation/immunology MH - Leukocyte Common Antigens/genetics/*immunology MH - Lymphocyte Activation/genetics/immunology MH - Mice MH - Mice, Knockout MH - Receptors, Antigen/genetics/*immunology MH - Signal Transduction/genetics/*immunology MH - T-Lymphocytes/*immunology MH - src-Family Kinases/immunology EDAT- 1999/12/22 00:00 MHDA- 1999/12/22 00:01 CRDT- 1999/12/22 00:00 PHST- 1999/12/22 00:00 [pubmed] PHST- 1999/12/22 00:01 [medline] PHST- 1999/12/22 00:00 [entrez] AID - 10.1002/(SICI)1521-4141(199912)29:12<3951::AID-IMMU3951>3.0.CO;2-9 [doi] PST - ppublish SO - Eur J Immunol. 1999 Dec;29(12):3951-5. doi: 10.1002/(SICI)1521-4141(199912)29:12<3951::AID-IMMU3951>3.0.CO;2-9.