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| Content Provider | World Health Organization (WHO)-Global Index Medicus |
|---|---|
| Author | Lawrence, D. M. El-hamouly, W. Leary, J. F. Archer, S. Bidlack, J. M. |
| Description | Author Affiliation: Lawrence DM ( Department of Pharmacology, University of Rochester, School of Medicine and Dentistry, NY 14642.); |
| Abstract | A method to visualize the kappa opioid receptor is described that uses a high-affinity fluorescein-conjugated opioid ligand and indirect immunofluorescence with the phycoerythrin fluorophore to amplify the signal. The mouse thymoma cell line R1E/TL8x.1.G1.OUAr.1 (R1EGO), which expresses the kappa 1 but not mu or delta opioid receptors, was used as a positive control for fluorescence labeling. A fluorescein isothiocyanate-conjugated arylacetamide (FITC-AA) compound displaying high affinity for the kappa opioid receptor was synthesized. R1EGO cells were incubated with FITC-AA, in the absence or presence of the kappa-selective opioid antagonist nor-binaltorphimine (nor-BNI) as a competitor. By using fluorescence microscopy and flow cytometry, incubation of R1EGO cells with FITC-AA alone was not sufficient for the detection of specific staining of the kappa opioid receptor. To amplify the FITC-AA fluorescence, the fluorescein served as a hapten for subsequent antibody detection. R1EGO cells were incubated with FITC-AA, followed by biotinylated rabbit anti-fluorescein IgG and extravidin-conjugated R-phycoerythrin. By using this approach, R1EGO cells were stained with phycoerythrin-amplified FITC-AA, and the staining was displaced with nor-BNI. Flow cytometry showed that titrations of both FITC-AA and nor-BNI produced saturable concentration-dependent changes in the median phycoerythrin fluorescence intensity, with optimal staining at 30 microM FITC-AA. Up to 80% of the fluorescence above background was inhibited by nor-BNI. Freshly isolated thymocytes from C57BL/6ByJ mice also showed nor-BNI-sensitive staining with the FITC-AA amplification. This sensitive method of indirect phycoerythrin immunofluorescence can be used to amplify any fluorescein-conjugated opioid ligand for the detection of opioid receptors. |
| ISSN | 00278424 |
| e-ISSN | 10916490 |
| Journal | Proceedings of the National Academy of Sciences of the United States of America |
| Issue Number | 4 |
| Volume Number | 92 |
| Language | English |
| Publisher | National Academy of Sciences |
| Publisher Date | 1995-03-01 |
| Publisher Place | United States |
| Access Restriction | Open |
| Subject Keyword | Immune System Chemistry Receptors, Opioid, Kappa Acetamides Amino Acid Sequence Animals Fluorescein-5-isothiocyanate Fluorescent Antibody Technique Mice Mice, Inbred C57BL Molecular Sequence Data Naltrexone Analogs & Derivatives Tumor Cells, Cultured Research Support, U.S. Gov't, P.H.S. Multidisciplinary |
| Content Type | Text |
| Resource Type | Article |
| Subject | Multidisciplinary |
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