Immunochemical or fluorescent labeling of vesicular subcellular fractions for microscopy imaging

Area of Science:

• Cell Biology
• Microscopy Techniques
• Neuroscience

Background:

• Purified subcellular fractions, such as organelles, require specialized methods for imaging as they cannot be directly mounted on slides.
• Existing techniques may involve freezing or embedding, potentially altering cellular structures.

Purpose of the Study:

• To develop and validate a new procedure for labeling purified membranous vesicular subcellular fractions for imaging.
• To demonstrate the applicability of this technique to various biologically relevant fractions.

Main Methods:

• A batch labeling procedure involving resuspension, centrifugation, and washing steps was employed.
• Fractions were immunolabeled with specific antibodies.
• Confocal laser scanning microscopy was used for imaging.

Main Results:

• The method successfully labeled mammalian retinal rod outer segment disks, brain stem myelin vesicles, and brain synaptosomes.
• MitoTracker Deep Red 633 staining confirmed the respiring capacity of myelin vesicles and rod disks.
• The technique proved effective for visualizing these subcellular structures.

Conclusions:

• The described labeling procedure is a valuable tool for studying the structure and function of purified subcellular fractions.
• This technique offers an alternative to traditional methods, avoiding freezing or embedding.
• It has potential applications in neuroscience and cell biology research.