Gene/Protein Disease Symptom Drug Enzyme Compound
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Query: UMLS:C0220723 (PCA)
 4,687 document(s) hit in 31,850,051 MEDLINE articles (0.00 seconds)

Clinical and serologic effects of TDI exposure were studied in 112 occupationally exposed plant workers. Sera were obtained before and after commencement of TDI production. All subjects were skin-tested with common inhalant allergens and a TDI-HSA conjugate. Total eosinophil counts, immunoglobulin quantitations, and specific antibody assays by PCA, P-K, and radioimmunoassay were performed. Clinically "sensitive" individuals were tested by provocative inhalation challenge with from 0.005 ppm to the threshold limit value of 0.02 ppm TDI. No TDI-induced immunologic changes were noted with the exception of 3 individuals who demonstrated small positive wheal-and-erythema reactions to TDI-HSA but not to HSA alone. Inhalation challenge with TDI vapor produced airways obstruction, as measured by FEF (25-75). These responses were of the immediate, delayed, and dual type, and were provoked in some cases with levels as low as 0.005 ppm TDI.
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PMID:Toluene diisocyanate (TDI) pulmonary disease: immunologic and inhalation challenge studies. 18 12

Two platinum (Pt) refinery workers with work related asthma was reported. The serum specific IgE and skin test for Pt antigen were positive. Ten guinea pigs were immunized with Pt-BSA conjugates employing CFA or AHG adjuvant via intraperitoneal. After 5-8 weeks, 33.3% of the sensitized animals experienced asthma attacks after a Pt-HSA challenge. The dynamic ventilation pulmonary imaging with 99mTc-DTPA showed a central accumulation of radioactivity. A specific IgE and IgG type antibodies were developed in 66.7% of sensitized animals by PCA test. Results of these suggested that platinum complex salt have antigenic specify. Allergic response play an important role in the mechanism of Pt induced asthma.
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PMID:[A study on the immunology and etiology of platinum induced asthma]. 181 74

Immunogenicity of netilmicin (NTL) was studied and following results were obtained. The antisera obtained from rabbits immunized with both NTL alone and NTL . HSA mixture did not show positive response in the heterologous 3-hour PCA reaction and the passive hemagglutination test against the challenge of either NTL alone of NTL . OVA mixture. Guinea pigs immunized with NTL alone did not exhibit systemic anaphylaxis when elicited with NTL alone. The antisera obtained from BALB/c mice immunized with NTL-OVA conjugate adsorbed to A1(OH)3 gel gave positive response in the 24-hour PCA reaction by the method described by MOTA, whereas did not respond to intact NTL in the same system. Similar responses were also obtained in the animals immunized with either gentamicin or gentamicin.protein mixture used as control.
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PMID:[Immunogenicity study of netilmicin (author's transl)]. 709 88

In this study, we measured the antiallergic activities of ginsenosides isolated from the root of Panax ginseng ( Araliaceae), and of their metabolites, as produced by human intestinal bacteria. Compound K, which was identified as a main metabolite, had the most potent inhibitory activity on beta-hexosaminidase release from RBL-2H3 cells and on the PCA reaction. The inhibitory activity of compound K was more potent than that of disodium cromoglycate, one of the commercial anti-allergic drugs. This compound demonstrated a membrane stabilizing action on differential scanning calorimetry. However, compound K did not inhibit the activation of hyaluronidase and did not scavenge active oxygen. These results suggest that the antiallergic action of compound K originates from its cell membrane stabilizing activity and that the ginsenosides of ginseng are prodrugs with extensive antiallergic properties. Abbreviations. compound K:20- O-beta- D-glucopyranosyl-20( S)-protopanaxadiol DNP:dinitrophenol DSCG:disodium cromoglycate DPPC:dipalmitoylphosphatidylcholine DPPH:1,1-diphenyl-2-picrylhydrazyl HSA:human serum albumin IC 50 :50% inhibitory concentration EC 50 :50% effective concentration XOD:xanthine oxidase ICR:Institute of Cancer Research PBS:phosphate buffered saline PCA:passive cutaneous anaphylaxis RAW264.7:mouse monocyte leukemiaRBL-2H3: rat basophil leukemia SD:Sprague-Dawley
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PMID:Antiallergic activity of ginseng and its ginsenosides. 1286 69

Human serum albumin is a remarkable protein found in high concentrations in the body. It contains at least seven distinct fatty acid binding sites and two principle sites for drugs. Its primary function is to act as a fatty acid transport system, but it also shows the capacity to bind a diverse range of acidic, neutral and zwitterionic drug molecules. In this paper we investigate the ligand binding selectivity of HSA using cheminformatics analyses and molecular dynamics simulations. We compare and contrast the known ligand binding specificities as obtained from X-ray structural data using PCA, with additional direct analyses of the seven key binding pockets using analyses derived from molecular simulations. We assess both the fatted and defatted states of HSA using 100 ns simulations of the APO and HOLO forms, as well as structures containing one, three and seven myristic acid molecules. We find that differences in fatty acid binding can have a dramatic effect on the flexibility of the protein and also the pocket characteristics. We discuss how the remarkable selectivity of the HSA pockets towards both endogenous fatty acids and exogenous drug molecules is not simply controlled by bulk property effects such as ionization state and lipophilicity.
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PMID:Probing the binding site characteristics of HSA: a combined molecular dynamics and cheminformatics investigation. 2545 68