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The sensitivity of cochlear albino melanocytes to horseradish peroxidase
Abstract:
The effects of low concentrations (0.5%--0.0005%) of HRP and varying postperfusion survival times (5.5 hours--15 seconds) on cochlear albino melanocytes were studied by light and electron microscopy. Approximately 50 microliter of differing concentrations of HRP dissolved in artificial perilymph were perfused through the perilymphatic space in 32 albino guinea pigs. Tissues were subsequently treated histochemically to demonstrate HRP reaction product. The results indicate that concentrations of HRP > 0.0005% in combination with postperfusion survival times > 1 hour bring about acute and selective injury to the albino melanocytes; cytoplasmic vacuolization and rupture of cell membranes occurred. The structural integrity of the albino melanocytes appeared unaltered when exposed to 0.0005% concentrations of HRP for less than or equal to 1 hour. An apparently non-toxic 0.0005% concentration of HRP may provide a means of labeling cochlear melanocytes when the effects of other substances on the cells are investigated.
Insights
Horseradish peroxidase (HRP) concentrations above 0.0005% with survival times over 1 hour caused injury to cochlear albino melanocytes. Lower HRP concentrations may label these cells without toxicity.
Area of Science:
- Oto-neurology
- Cell Biology
- Histochemistry
Background:
- Cochlear albino melanocytes play a role in inner ear function.
- Understanding the effects of experimental substances on these cells is crucial.
Purpose of the Study:
- To investigate the toxic effects of horseradish peroxidase (HRP) on cochlear albino melanocytes.
- To determine safe concentrations of HRP for potential cell labeling.
Main Methods:
- Albino guinea pigs were perfused with varying concentrations of HRP (0.5% to 0.0005%) in artificial perilymph.
- Postperfusion survival times ranged from 15 seconds to 5.5 hours.
- Light and electron microscopy were used to examine melanocyte injury, with histochemical staining for HRP reaction product.
Main Results:
- HRP concentrations greater than 0.0005% combined with survival times exceeding 1 hour induced significant injury, including cytoplasmic vacuolization and cell membrane rupture.
- Cochlear albino melanocytes remained structurally intact when exposed to 0.0005% HRP for 1 hour or less.
Conclusions:
- HRP concentrations above 0.0005% are cytotoxic to cochlear albino melanocytes.
- A 0.0005% HRP concentration appears non-toxic and suitable for labeling cochlear melanocytes in future studies.