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The Histochemical Journal

, Volume 20, Issue 9, pp 510–518 | Cite as

A new method for the histochemical demonstration ofO-acyl sugars in human colonic epithelial glycoproteins

  • P. E. Reid
  • D. Volz
  • K. Y. Cho
  • D. A. Owen
Papers

Summary

A new general method has been developed for the specific histochemical identification ofO-acyl sugars in any epithelial glycoprotein. These sugars include hexose, 6-deoxyhexose andN-acetylhexosamine with an ester substituenent(s) located on a potentialvicinal diol(s). In the procedure reported [the periodic acid-borohydride reduction-saponification-selective periodate oxidation-borohydride reduction-periodic acid-Schiff (PA-Bh-KOH-PA-Bh*-Bh-PAS) method] the initial PA-Bh treatment rendersvicinal diols located on either sialic acid or neutral sugars PAS unreactive. In the subsequent steps ester substituents are removed from bothO-acyl sugars andO-acyl sialic acids by saponification (KOH), sialic acidvicinal diols are selectively removed by the PA*-Bh sequence andO-acyl sugars are stained with the PAS technique. This method has the advantage that the results are obtained with a single section and the results are either positive or negative. Consequently, it is superior to the three indirect methods investigated because it does not require an observer to compare the intensity or the shade of the staining obtained with serial sections.

Using the PA-Bh-KOH-PA*-Bh-PAS method we have demonstrated, for the first time, thatO-acyl sugars occur in the epithelial goblet cell glycoproteins of adult human colon. The effect of the presence ofO-acyl sugars on the interpretation of a number of other methods for the histochemical investigation of glycoproteins is discussed. It is recommended that the results obtained with the PA-Bh-KOH-PA*-Bh-PAS method be evaluated before histochemical procedures for the investigation of neutral sugars andO-acyl sialic acids are selected.

Keywords

Diol Sialic Acid Hexose Goblet Cell Periodate 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Chapman and Hall Ltd 1988

Authors and Affiliations

  • P. E. Reid
    • 1
  • D. Volz
    • 1
  • K. Y. Cho
    • 1
  • D. A. Owen
    • 1
  1. 1.Department of Pathology, Faculty of MedicineUniversity of British ColumbiaVancouverCanada

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