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Human carbonic anhydrase isoenzyme C

Effects of some fixatives on the antigenicity and improvements in the method of localization

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Summary

The effects of some alcohol and aldehyde containing fixatives on the antigenicity of human carbonic anhydrase isoenzyme C (HCA C) were tested in order to reveal the most suitable method for the immunohistochemical localization of this enzyme. The use of 2% and 4% paraformaldehyde or 2% glutaraldehyde solutions before immunoperoxidase (PAP) staining resulted in the loss of HCA C-specific reactivity in the surface epithelial cells of human appendicular and gastric mucosae, whereas the antigenic reactivity of HCA C was well retained in the parietal cells of gastric glands. In corresponding tissue sections fixed with one of the alcohol containing solutions (abs. methanol, methanol+chloroform 2∶1 or Carnoy fluid) both the surface epithelial and parietal cells showed HCA C-specific immunostaining after the PAP procedure. In addition, the antigenicity of HCA C was found to be well preserved in some tubular cells of human kidney fixed in Carnoy fluid. The paraffin infiltration at relatively low temperature did not markedly affect the enzyme antigenicity. Fixation in Carnoy fluid coupled with paraffin embedding at 55–60° C in vacuo was found to give the best preservation of the antigenicity of HCA C with good morphological integrity for light microscopical localization.

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Authors and Affiliations

  1. Department of Anatomy, University of Oulu, Kajaanintie 52A, SF-90220, Oulu 22, Finland

    T. Kumpulainen

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  1. T. Kumpulainen
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Grant support from the Finnish Culture Foundation

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Kumpulainen, T. Human carbonic anhydrase isoenzyme C. Histochemistry 72, 425–431 (1981). https://doi.org/10.1007/BF00501784

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  • DOI: https://doi.org/10.1007/BF00501784

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