Verification of Protein Changes Determined by 2D-DIGE Based Proteomics Using Immunofluorescence Microscopy

Area of Science:

• Biochemistry
• Proteomics
• Cell Biology

Background:

• Fluorescence two-dimensional difference gel electrophoresis (2D-DIGE) is a crucial method for analyzing complex protein mixtures.
• Top-down proteomics utilizes 2D-DIGE for identifying and characterizing individual protein species.
• Verifying protein expression changes and subcellular localization is essential for comprehensive proteomic studies.

Purpose of the Study:

• To detail the methodology for combining 2D-DIGE with immunofluorescence microscopy.
• To provide a protocol for assessing protein expression changes and subcellular localization.
• To illustrate the application of these techniques with specific examples.

Main Methods:

• Detailed protocols for tissue specimen preparation and cryo-sectioning.
• Immunofluorescence staining procedures using primary and fluorescently labeled secondary antibodies.
• Image analysis techniques for evaluating protein localization and co-detection.

Main Results:

• Demonstration of co-detection of immuno-labeled dystrophin and Y-chromosome in skeletal muscle.
• Presentation of calbindin localization in the cerebellum.
• Successful application of combined techniques for proteomic analysis.

Conclusions:

• Immunofluorescence microscopy effectively complements 2D-DIGE for validating protein expression and determining subcellular localization.
• The described methods provide a robust framework for detailed proteomic characterization.
• This integrated approach enhances the understanding of protein function and distribution in biological tissues.