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An improved cobalt labeling technique with complex compounds

T Górcs, M Antal, E Oláh

    Acta Biologica Academiae Scientiarum Hungaricae
    |January 1, 1979
    PubMed
    Summary
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    Cobaltic lysine with dimethyl sulphoxide offers superior axonal transport for nerve tracing in frogs, surpassing cobalt chloride and cobaltous lysine. This method enhances cobalt uptake and extends transport distance for detailed neural pathway visualization.

    Area of Science:

    • Neuroscience
    • Cell Biology
    • Biochemistry

    Background:

    • Axonal transport is crucial for neuronal function and studying neural circuits.
    • Cobalt-based tracers are used for visualizing nerve fibers and terminals.
    • Optimizing axonal transport distance and staining quality is essential for effective neural tracing.

    Purpose of the Study:

    • To compare the efficacy of different cobalt complexes for axonal labeling in the frog nervous system.
    • To determine the optimal cobalt compound and conditions for long-distance axonal transport.
    • To investigate the role of dimethyl sulphoxide in enhancing cobalt axonal uptake.

    Main Methods:

    • Axonal labeling experiments were conducted on dorsal roots and nerves of the spinal cord and brain stem in living frogs.

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  • Three cobalt compounds were tested: cobalt chloride (CoCl2), cobaltous lysine, and cobaltic lysine.
  • The effect of combining cobaltic lysine with dimethyl sulphoxide (DMSO) on axonal transport was evaluated.

    • Main Results:

    • Cobalt chloride (CoCl2) provided the most satisfactory staining but had limited axonal transport (6-10 mm).
    • Cobaltous lysine showed improved transport over CoCl2 but poor spinal cord fiber staining.
    • Cobaltic lysine demonstrated the best axonal transport (40-50 mm).
    • Combining cobaltic lysine with 2-5% dimethyl sulphoxide significantly enhanced cobalt uptake and extended transport to 70-80 mm.

    Conclusions:

    • Cobaltic lysine, particularly when combined with dimethyl sulphoxide, is a highly effective tracer for long-distance axonal transport in the frog nervous system.
    • The enhanced transport is potentially due to reduced toxicity of cobalt complexes to nerve cells.
    • This optimized method allows for more comprehensive visualization of neural pathways.