Synopsis
The effect of fixation and processing upon the morphological appearance of glycogen within the outer hair cells of the guinea-pig was investigated using two methods. In each method, tissue was fixed for 12 h in cold phosphate-buffered 4% paraformaldehyde and eventually dehydrated in ethanol, embedded in Epon 812, and cut into 4 μm sections. In procedure A, after complete processing, the sections were tained using the periodic acid-Schiff reaction (PAS) or the periodic acid-thiocarbo-hydrazide-osmium tetroxide (PATCO) reaction which resulted in the appearance of listinct, coarse granules in the cytoplasm of the outer hair cells. Diastase digestion on one of the two matched sections after Epon removal and prior to staining, confirmed the granules to be glycogen. In procedure B, after primary fixation, the tissue was post-fixed in 1% osmium tetroxide and then processed exactly as in procedure A. Here, unless the Epon and osmium was ‘remoyed’, there was no staining of the outer hair cell cytoplasm. However, after Epon removal there was diffuse, grainy appearance of the outer hair cell cytoplasm which we considered to be due to glycogen although diastase confirmation was not possible. We have concluded that osmium tetroxide (1) inhibits PAS or PATCO staining, (2) prevents diastase digestion, and (3) prevents the appearance by light microscopy of distinct granules of glycogen.
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Postma, D.S., Logue, S., Pecorak, J.B. et al. Histochemistry of glycogen in the inner ear. Histochem J 10, 53–61 (1978). https://doi.org/10.1007/BF01003414
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DOI: https://doi.org/10.1007/BF01003414