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Immunology and the confocal microscope
D M Ojcius1, F Niedergang, A Subtil
1Unité de Biologie des Interactions Cellulaires, CNRS URA 1960, Paris.
Insights
Confocal microscopy offers higher resolution than traditional epifluorescence microscopy for immunological studies. This technique enhances the analysis of antigen distribution, intracellular events, and cell interactions, advancing antigen presentation research.
Area of Science:
- Immunology
- Cell Biology
- Microscopy
Background:
- Epifluorescence microscopy is widely used in immunology for antigen detection.
- Inhibitor studies have elucidated antigen presentation mechanisms.
- Confocal microscopy provides higher resolution and quantitative analysis of cellular cross-sections.
Purpose of the Study:
- To review the technique of confocal microscopy for immunological applications.
- To provide protocols for sample preparation (fixing, permeabilizing, mounting).
- To highlight confocal microscopy's utility in studying intracellular processes and molecular distributions.
Main Methods:
- Description of confocal microscopy principles.
- Detailed protocols for cell fixation and permeabilization.
- Methods for mounting biological samples on microscope slides.
Main Results:
- Confocal microscopy enables quantitative analysis of single cellular cross-sections.
- It is well-suited for studying intracellular membrane traffic and cell-cell interactions.
- Applications include tracking antigen distribution, co-localization with markers, and receptor endocytosis.
Conclusions:
- Confocal microscopy significantly advances immunological research by offering superior resolution and quantitative capabilities.
- The review provides practical protocols for implementing this technique in diverse immunological studies.
- It facilitates deeper understanding of molecular interactions, antigen presentation, and cellular processes.
Abstract:
The techniques of classical epifluorescence microscopy are already widely used by the immunological community to detect antigens at the cellular level. Coupled with the use of specific inhibitors that affect diverse intracellular events, these techniques have provided valuable information on the mechanisms involved in antigen presentation. The same biological samples can now be examined by confocal microscopy, which has a higher resolution than conventional microscopy and allows one to analyse quantitatively single cross-sections of the sample. The confocal microscope is therefore especially well-suited for studies on intracellular membrane traffic, cell-to-cell interactions, and the distribution of particular antigens and their co-localization with other intracellular markers. This review describes the technique of confocal microscopy and the goals of sample preparation, along with several detailed protocols for fixing and permeabilizing cells and mounting them on microscope slides. Representative examples are cited from studies on the endocytosis of surface receptors, the distribution of adhesion and major histocompatibility complex (MHC) molecules, and the interaction of an intracellular parasite with MHC molecules of the host cell.