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Visualization of the neuronal tract tracer horseradish peroxidase (HRP) is commonly achieved through the histochemical detection of its enzymatic activity using 3,3',5,5'-tetramethylbenzidine (TMB) as a chromogen. However, the TMB product is unstable and is incompatible with tissue processing methods that render the enzyme inactive, or when a combination of HRP tract tracing with neuronal phenotype identification is required. In this study we evaluated the applicability of the immunocytochemical detection method for horseradish peroxidase (HRP) visualization using an enhanced detection meth-od based on the Elite ABC peroxidase amplification protocol. The results provide evidence for the immunocytochemical visualization of both anterograde and transganglionic HRP transport in the rat spinal cord. This immunocytochemical method not only showed similar sensitivity to the TMB protocol in detecting HRP-labeled motor neuron perikarya but provided enhanced resolution in the identification of individual neuronal fibers compared to the TMB method. Immunodetection of the HRP tracer also allowed its co-localization with specific neuronal markers using double immunofluorescence techniques. These results offer the first demonstration that sensitive identification of axonally transported HRP can be achieved by immunocytochemistry and provides further support for its use in HRP tract tracing studies.

journal of histochemistry and cytochemistry/the journal of histochemistry and cytochemistry

Visualization of Axonally Transported Horseradish Peroxidase Using Enhanced Immunocytochemical Detection: A Direct Comparison with the Tetramethylbenzidine Method