Fluorescent antibody localization of myosin in the cytoplasm, cleavage furrow, and mitotic spindle of human cells.
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Implication
Immunofluorescence study reveals myosin localization within stress fibers, contractile rings, and mitotic spindles in human cells, highlighting its mechanical role during division.
Key Points
- Determine the precise subcellular distribution and localization of myosin molecules in non-dividing and dividing human cells using fluorochrome-labeled antibodies.
- Immunized rabbits with human platelet myosin or myosin rod to generate monospecific antisera, followed by IgG purification and fluorochrome conjugation.
- Purified dye-conjugated IgG fractions using ion exchange chromatography and validated specificity through preimmune, adsorption, and affinity-purification controls.
- Stained acetone-treated human blood smears, Enson cells, and HeLa cells to visualize myosin distribution across distinct cellular compartments and mitotic stages.
- Stress fibers in spread Enson and HeLa cells exhibited prominent myosin staining arranged in discrete 0.5 µm punctate foci, whereas motile cells displayed uniform cytoplasmic staining.
- Dividing HeLa cells demonstrated dense myosin accumulation within the contractile ring at the cleavage furrow and throughout the mitotic spindle between the poles and chromosomes.
- Cytoplasmic myosin staining was restricted to platelets and leukocytes, with complete absence of signal in erythrocytes, cell nuclei, and external cell membranes.
Cite This Study
Fujiwara et al. (1976) studied this question.