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Rabbit alveolar macrophages rapidly internalize and degrade mannosylated bovine serum albumin (125I-mannose-BSA). Trichloroacetic acid-soluble degradation products appear in the cells as early as 6 min after uptake at 37 degrees C, and in the extracellular medium after 10 min. Incubation of endocytic vesicles containing this ligand in isotonic buffers at pH(More)
Glutamic acid decarboxylase (GAD) has been defined as a major target antigen in insulin-dependent diabetes mellitus (IDDM). To identify the molecular ligands triggering a T cell response to GAD, a panel of human GAD65-specific T lymphocyte lines was generated from peripheral blood of three recent onset IDDM patients. All lines derived from a patient(More)
Receptor tyrosine kinases (RTKs) such as Tie-2, IGF1R, Her-2/Neu, EGFR, and VEGFR1-3 play crucial roles in the control of cell growth and differentiation. Inhibition of such RTKs has become a major focus of current anticancer drug development, and therefore the discovery of new classes of inhibitors for these signal-transducing proteins is of prime(More)
Essential fatty acid (EFA) deficiency has been shown to protect against the glomerulonephritis in a murine model of systemic lupus erythematosus. Since macrophages are an important cellular constituent of the inflammatory lesion, the effects of EFA deficiency on the eicosanoid metabolism and function of these cells were determined. EFA-deficient macrophages(More)
Macrophages express a mannose-specific pinocytosis receptor that binds and internalizes lysosomal hydrolases. Treatment of rat bone marrow-derived macrophages with dexamethasone resulted in a concentration- and time-dependent increase in mannose-receptor activity. The dexamethasone effect was maximal at 24 h. Half-maximal effects were observed at a(More)
The Her-2/Neu receptor tyrosine kinase is vastly overexpressed in about 30% of primary breast, ovary, and gastric carcinomas. The nakijiquinones are the only naturally occurring inhibitors of this important oncogene, and structural analogues of the nakijiquinones may display inhibitory properties toward other receptor tyrosine kinases involved in cell(More)
A rat liver mannan-binding protein was isolated by affinity chromatography on invertase--Sepharose by a modification of the method of Kawasaki, Etoh & Yamashina [(1978) Biochem. Biophys. Res. Commun. 81, 1018-1024] and by a new method involving chromatography on mannose-Sepharose. The binding protein appears as a single band on sodium dodecyl(More)