Immunoelectron microscopy of cell surface antigens: a quantitative analysis of antibody binding after different fixation protocols
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1573-6865
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| Source: |
Springer Online Journal Archives 1860-2000
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| Topics: |
Biology
Medicine
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| Notes: |
Summary The effect of different fixation solutions on the denaturation of membrane-associated antigens in murine lymphoid cells was determined quantitatively using microfluorometric analysis and a radioimmunoassay. Paraformaldehyde and periodate-lysine-paraformaldehyde solutions preserved the antigenicity of cell surface-associated immunoglobulin (S−Ig) antigens when used in concentrations ranging from 0.01 to 4%. However, glutaraldehyde destroyed the antigenicity of S−Ig and Thy 1.2 molecules at concentrations higher than 0.1%. Electron microscopic analysis of the different fixed cell suspensions, after labelling of the cells with a rabbit anti-mouse immunoglobulin-horseradish peroxidase conjugate (RaM-Ig-HRP) showed that prefixation of the sample with 0.1% glutaraldehyde was optimal for immunoelectron microscopical studies, since this concentration preserved both the antigenicity of membrane-associated antigens as well as the ultrastructure of the cells under study. Prolonged fixation periods affected antibody binding. However, S−Ig molecules denatured at a slower rate than Thy 1.2 molecules. A preparation method for the immunoelectron microscopical localization of lymphoid and non-lymphoid cell types in lymphoid organs is reported.
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| Type of Medium: |
Electronic Resource
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