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Identification and Characterization of Protein Glycosylation using Specific Endo- and Exoglycosidases
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A Chemoenzymatic Histology Method for O-GlcNAc Detection.

Aime Lopez Aguilar1, Xiaomeng Hou1, Liuqing Wen2

  • 1Department of Molecular Medicine, The Scripps Research Institute, La Jolla, CA, 92037, USA.

Chembiochem : a European Journal of Chemical Biology
|October 19, 2017
PubMed
Summary

A new chemoenzymatic histology method detects O-GlcNAc protein modification in tissues. This method revealed distinct O-GlcNAc patterns in healthy and diseased human tissues, including Alzheimer's and cancer.

Keywords:
GalT1O-GlcNAcchemoenzymatic detectionglycan labelinghistology

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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Histology

Background:

  • Protein O-GlcNAcylation (O-GlcNAc) is a dynamic post-translational modification regulating numerous cellular processes.
  • Understanding O-GlcNAc localization and levels is crucial for deciphering its role in health and disease.

Purpose of the Study:

  • To develop and validate a novel chemoenzymatic histology method for detecting O-GlcNAc in tissue specimens.
  • To investigate O-GlcNAc distribution patterns in various murine and human tissues.
  • To compare O-GlcNAc levels in healthy versus diseased human tissues, including Alzheimer's disease and cancer.

Main Methods:

  • Development of a chemoenzymatic histology technique for targeted O-GlcNAc detection.
  • Application of the method to screen murine organs for O-GlcNAc distribution.
  • Analysis of human brain and cancer tissue arrays using the developed histology method.

Main Results:

  • The chemoenzymatic method successfully detected O-GlcNAc in tissue specimens.
  • Specific O-GlcNAc distribution patterns were identified in different murine tissue structures.
  • Human brain tissues from healthy donors showed higher O-GlcNAc levels compared to Alzheimer's disease specimens.
  • Differential O-GlcNAc levels and cellular distributions were observed between healthy and cancerous tissues.

Conclusions:

  • The developed chemoenzymatic histology method is effective for visualizing O-GlcNAc in diverse tissue types.
  • This method provides valuable insights into O-GlcNAc dysregulation in pathological conditions like Alzheimer's disease and cancer.
  • The technique holds significant potential for advancing research into the biological roles of O-GlcNAc in physiology and disease.