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Horseradish peroxidase (HRP), a commonly used enzymatic marker for tracing pathways in the central nervous system, can be visualized histochemically with the aid of the chromogen tetramethyl benzidine (TMB). In a recent report, Olucha and collaborators (J Neurosci Meth 13:131, 1985) introduced the use of ammonium heptamolybdate (AHM) as a substitute for sodium nitroferricyanide (SNF) which serves to stabilize the HRP reaction product. This TMB-AHM method of Olucha et al. proves superior to the TMB-SNF method of Mesulam (J Histochem Cytochem 26:106, 1978) in that the reaction does not produce crystalline artifact. For visualization of retrogradely transported HRP, the two methods are reportedly equivalent in sensitivity. In the work reported here, we have compared the sensitivity of the two methods in detecting HRP that was transported anterogradely after intraocular injections of the enzyme in normal adult and neonatal hamsters, as well as in animals with lesions of the superior colliculus or retina. We demonstrate that the TMB-SNF method is decidedly more sensitive than the TMB-AHM technique for visualization of anterogradely transported HRP. This difference in sensitivity is especially evident in regions of sparse projections.

Visualizing anterogradely transported HRP by use of TMB histochemistry: comparison of the TMB-SNF and TMB-AHM methods.