PMID- 10602004 OWN - NLM STAT- MEDLINE DCOM- 20000104 LR - 20180420 IS - 0014-2980 (Print) IS - 0014-2980 (Linking) VI - 29 IP - 12 DP - 1999 Dec TI - Biochemical and functional analysis of mice deficient in expression of the CD45-associated phosphoprotein LPAP. PG - 3956-61 AB - The role of the CD45-associated phosphoprotein (LPAP / CD45-AP) during an immune response remains unclear. To understand better the function of LPAP we generated LPAP-deficient mice by disrupting exon 2 of the LPAP gene. LPAP-null mice were healthy and did not show gross abnormalities compared to their wild-type littermates. However, immunofluorescence analysis of T and B lymphocytes revealed a reduced expression of CD45, which did not affect a particular subpopulation. In contrast to a recent report (Matsuda et al., J. Exp. Med. 1998. 187: 1863 - 1870) we neither observed significant alterations of the assembly of the CD45 / lck-complex nor of polyclonal T-cell responses. However, lymphnodes from LPAP-null mice showed increased cellularity, which could indicate that expression of LPAP might be required to prevent expansion of lymphocytes in particular lymphatic organs rather than potentiating immune responses. FAU - Ding, I AU - Ding I AD - Immunomodulation Laboratory of the Institute for Immunology University of Heidelberg, Heidelberg, Germany. FAU - Bruyns, E AU - Bruyns E FAU - Li, P AU - Li P FAU - Magada, D AU - Magada D FAU - Paskind, M AU - Paskind M FAU - Rodman, L AU - Rodman L FAU - Seshadri, T AU - Seshadri T FAU - Alexander, D AU - Alexander D FAU - Giese, T AU - Giese T FAU - Schraven, B AU - Schraven B LA - eng PT - Journal Article PT - Research Support, Non-U.S. Gov't PL - Germany TA - Eur J Immunol JT - European journal of immunology JID - 1273201 RN - 0 (Intracellular Signaling Peptides and Proteins) RN - 0 (Membrane Proteins) RN - 0 (Phosphoproteins) RN - 0 (Ptprcap protein, mouse) RN - EC 3.1.3.48 (Leukocyte Common Antigens) SB - IM MH - Animals MH - Gene Expression Regulation/*immunology MH - Intracellular Signaling Peptides and Proteins MH - Leukocyte Common Antigens/genetics/*immunology MH - Lymphocyte Activation/genetics/immunology MH - Membrane Proteins MH - Mice MH - Mice, Knockout MH - Phosphoproteins/*genetics/*immunology MH - T-Lymphocytes/*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<3956::AID-IMMU3956>3.0.CO;2-G [doi] PST - ppublish SO - Eur J Immunol. 1999 Dec;29(12):3956-61. doi: 10.1002/(SICI)1521-4141(199912)29:12<3956::AID-IMMU3956>3.0.CO;2-G.