Murine DEP-1, a receptor protein tyrosine phosphatase, is expressed in macrophages and is regulated by CSF-1 and LPS.
The spectrum of protein tyrosine phosphatases (PTPs) expressed in bone marrow-derived murine macrophages (BMMs) was examined using reverse transcriptase-polymerase chain reaction. Ten different PTP cDNAs were isolated and in this study we focus on mDEP-1, a type III receptor PTP. Three mDEP-1 transcripts were expressed in primary macrophages and macrophage cell lines and were induced during macrophage differentiation of M1 myeloid leukemia cells. A variant mRNA was identified that encodes an alternate carboxyl-terminus and 3' UTR. The expression of mDEP-1 was down-regulated by CSF-1 (macrophage colony-stimulating factor) and up-regulated by bacterial lipopolysaccharide, an important physiological regulator of macrophage function that opposes CSF-1 action. Whole mount in situ hybridization, and immunolocalization of the protein, confirmed that mDEP-1 is expressed by a subset of embryonic macrophages in the liver and mesenchyme. mDEP-1 was also detected in the eye and peripheral nervous system of the developing embryo. Attempts to express mDEP-1 constitutively in the macrophage cell line RAW264 were unsuccessful, with results suggesting that the gene product inhibits cell proliferation.
Osborne
J M
JM
Department of Microbiology, Centre for Molecular and Cellular Biology, University of Queensland, Brisbane, Australia.
den Elzen
N
N
Lichanska
A M
AM
Costelloe
E O
EO
Yamada
T
T
Cassady
A I
AI
Hume
D A
DA
D000595:Amino Acid Sequence; D000818:Animals; D001483:Base Sequence; D015152:Blotting, Northern; D001854:Bone Marrow Cells / Q000378:metabolism*; D002454:Cell Differentiation; D002455:Cell Division; D019070:Cell Lineage; D003001:Cloning, Molecular; D018076:DNA, Complementary / Q000235:genetics; D005123:Eye / Q000196:embryology / Q000378:metabolism; D005136:Eye Proteins / Q000096:biosynthesis / Q000235:genetics; D019084:Fluorescent Antibody Technique, Indirect; D018507:Gene Expression Regulation, Developmental / Q000187:drug effects*; D017403:In Situ Hybridization; D008070:Lipopolysaccharides / Q000494:pharmacology*; D016173:Macrophage Colony-Stimulating Factor / Q000502:physiology*; D008264:Macrophages / Q000145:classification / Q000378:metabolism*; D008297:Male; D051379:Mice; D008807:Mice, Inbred BALB C; D008969:Molecular Sequence Data; D009419:Nerve Tissue Proteins / Q000096:biosynthesis / Q000235:genetics; D010525:Peripheral Nerves / Q000196:embryology / Q000378:metabolism; D016133:Polymerase Chain Reaction; D017027:Protein Tyrosine Phosphatases / Q000096:biosynthesis* / Q000235:genetics / Q000502:physiology; D012333:RNA, Messenger / Q000096:biosynthesis / Q000235:genetics; D054631:Receptor-Like Protein Tyrosine Phosphatases, Class 3
D018076:DNA, Complementary; D005136:Eye Proteins; D008070:Lipopolysaccharides; D009419:Nerve Tissue Proteins; D012333:RNA, Messenger; D016173:Macrophage Colony-Stimulating Factor; D017027:Protein Tyrosine Phosphatases; C098066:Ptprj protein, mouse; D054631:Receptor-Like Protein Tyrosine Phosphatases, Class 3