Gene/Protein Disease Symptom Drug Enzyme Compound
Pivot Concepts:   Target Concepts:
Query: UMLS:C0393754 (HSA)
 2,996 document(s) hit in 31,850,051 MEDLINE articles (0.00 seconds)

The omega-conotoxin GVIA (CTX) receptor has been purified 1900-fold to apparent homogeneity by monitoring both reversible binding of 125I-labeled CTX (125I-CTX) and photoincorporation of N-hydroxysuccinimidyl-4-azidobenzoate-125I-CTX (HSA-125I-CTX). Photoincorporation of HSA-125I-CTX into a 230-kDa protein exhibits a pharmacologic and chromatographic profile indicating that the 230-kDa protein is the CTX-binding subunit of the receptor. The pharmacologic specificity of 125I-CTX binding to the purified CTX receptor closely resembles that of the native membrane-bound form with respect to sensitivity towards CTX (Kd = 32 pM) and other peptide toxin antagonists. The purified CTX receptor comprises the 230-kDa protein (alpha 1) and four additional proteins with apparent molecular masses of 140 (alpha 2), 110, 70 (beta 2), and 60 (beta 1) kDa. This subunit structure closely resembles that of the 1,4-dihydropyridine-sensitive L-type calcium channel.
 ...
PMID:Purified omega-conotoxin GVIA receptor of rat brain resembles a dihydropyridine-sensitive L-type calcium channel. 166 83

Penicillin G (PNG) has been demonstrated to elicit T-cell responsiveness in vitro in allergic patients by means of a lymphocyte transformation test (LTT). As it was not clear how, or in what form, the stimulatory PNG determinants were inducing cellular proliferation, we compared the immune response elicited by different PNG preparations. Peripheral blood lymphocytes (PBL) of patients with proven PNG allergy were isolated, and proliferative responsiveness to soluble PNG alone, soluble PNG-protein conjugates (BPO-HSA, BPO-PL, BPO-HEX), and non-reactive penicilloate salts, was evaluated. An autologous mixed lymphocyte culture (MLC) using penicilloylated stimulator cells, was used to test responsiveness to membrane-bound PNG. We found that the addition of either 1000 micrograms/ml of potentially-reactive PNG to cell cultures, or of penicilloylated autologous cells was stimulatory, whereas non-reactive PNG salt, and soluble PNG conjugates were not stimulatory. Considering current and earlier findings, it appears that T cell immunity in these patients is directed towards PNG-modified "self", as PNG-modified autologous cells are potent stimulators in PNG-allergic individuals.
 ...
PMID:Penicillin-allergic patients react to penicillin-modified "self". 252 72

Cloned, immature mast cells derived from normal mice were passively sensitized with mouse monoclonal IgE antibodies with specificity for DNP, and then stimulated to degranulate with DNP35-HSA. Cells were fixed for transmission electron microscopy or recovered for quantitation of histamine release at various intervals up to 30 minutes after antigen challenge. The cloned mast cells rapidly extruded the contents of their immature granules (dense progranular material and membrane-bound vesicles) to the exterior via multiple openings in the plasma membrane. Degranulation was associated with striking activation of the cell surface, characterized initially by elongation of surface processes, as well as by close approximation of strands of rough endoplasmic reticulum to the cell surface and by the development of coated pits. At later times after stimulation, degranulated mast cells had released nearly all of their granules and exhibited angular surfaces lacking elongated processes. These findings demonstrate for the first time that cloned, immature mast cells, like their mature counterparts, can undergo classic morphologic release reactions involving exocytosis of granules.
 ...
PMID:Antigen-induced, IgE-mediated degranulation of cloned immature mast cells derived from normal mice. 382 2

Human basophils can be desensitized to IgE-mediated stimuli either specifically (to the desensitizing antigen only) or nonspecifically (to all antigens). It has been suggested that the specificity of desensitization depends on the number of membrane-bound, antigen-specific IgE antibody molecules per basophil. We have varied the number of IgE antibody molecules/basophil by passive sensitization of mixed leukocyte preparations with increasing concentrations of purified IgE anti-penicillin (BPO) antibody. The cells were then desensitized with penicillin-human serum albumin (BPO-HSA). Desensitization was specific (lack of response to BPO-HSA only) with 1000 specific antibody molecules/basophil, and increasingly nonspecific (greater than 70% desensitization to rechallenge with anti-IgE and ragweed antigen E as well as lack of response to BPO-HSA) as the number of antibody molecules was increased to 14,000. This formally established that the number of specific IgE antibody molecules/basophil determines the mode of desensitization.
 ...
PMID:The transition from specific to nonspecific desensitization in human basophils. 617 Jul 2

Action of N(epsilon)-(carboxymethyl)lysine-human serum albumin (CML-HSA) on neovascularization was investigated in cultured rat choroidal explant. Choroidal explants of normal male Wistar rats were cultured in fibrin gel with Dulbecco's modified Eagle medium containing fetal bovine serum in the presence or absence of CML-HSA. Migrated cells were budded from 2nd day in culture and developed from cultured choroidal explants in a time-dependent manner. Budded and developed cells from the choroidal explant had a feature of fibroblasts, which had attenuated long cytoplasmic processes, long ellipsoid nuclei and numerous membrane-bound polymorphic vesicles. Immunostaining of the attenuated cells in fibrin bed with CD34 (a marker protein of vascular endothelial cells and endothelial progenitor cells) failed to disclose positive result. However the cells which were isolated from fibrin bed by collagenase were specifically stained with anti-CD34 antibody. The isolated cells did not form tube-like structures on collagen gel by 3 weeks in culture. CML-HSA significantly increased the number of total isolated cells and CD34(+) cells as well as the number of vessel-like structures. These results indicate that CML-HSA overproduced immature blood vessels from cultured choroidal explants in fibrin gel, which consisted of CD34(+) cells. The CML-HSA-induced formation of immature blood vessel may be implicated in various choroidal diseases such as age-related macular degeneration.
 ...
PMID:N(epsilon)-(carboxymethyl)lysine proliferated CD34(+) cells from rat choroidal explant in culture. 1534 Feb 23

OBJECTIVE To evaluate expression of procoagulant tissue factor (TF) by canine hemangiosarcoma cells in vitro. SAMPLES 4 canine hemangiosarcoma cell lines (SB-HSA [mouse-passaged cutaneous tumor], Emma [primary metastatic brain tumor], and Frog and Dal-1 [primary splenic tumors]) and 1 nonneoplastic canine endothelial cell line (CnAoEC). PROCEDURES TF mRNA and TF antigen expression were evaluated by quantitative real-time PCR assay and flow cytometry, respectively. Thrombin generation was measured in canine plasma and in coagulation factor-replete or specific coagulation factor-deficient human plasma by calibrated automated thrombography. Corn trypsin inhibitor and annexin V were used to examine contributions of contact activation and membrane-bound phosphatidylserine, respectively, to thrombin generation. RESULTS All cell lines expressed TF mRNA and antigen, with significantly greater expression of both products in SB-HSA and Emma cells than in CnAoEC. A greater percentage of SB-HSA cells expressed TF antigen, compared with other hemangiosarcoma cell lines. All hemangiosarcoma cell lines generated significantly more thrombin than did CnAoEC in canine or factor-replete human plasma. Thrombin generation induced by SB-HSA cells was significantly lower in factor VII-deficient plasma than in factor-replete plasma and was abolished in factor X-deficient plasma; residual thrombin generation in factor VII-deficient plasma was abolished by incubation of cells with annexin V. Thrombin generation by SB-HSA cells was unaffected by the addition of corn trypsin inhibitor. CONCLUSIONS AND CLINICAL RELEVANCE Hemangiosarcoma cell lines expressed procoagulant TF in vitro. Further research is needed to determine whether TF can be used as a biomarker for hemostatic dysfunction in dogs with hemangiosarcoma.
 ...
PMID:Evaluation of procoagulant tissue factor expression in canine hemangiosarcoma cell lines. 2802 83