Lectin Histochemistry to Detect Altered Glycosylation in Cells and Tissues

  • Susan A. Brooks
  • Debbie M.S. Hall
Part of the Methods in Molecular Medicine book series (MIMM, volume 57)

Abstract

A lectin is “a protein or glycoprotein of non-immune origin, not an enzyme, that binds to carbohydrates and agglutinates cells” (1). Lectins are naturally occurring substances, most commonly derived from plant or sometimes invertebrate sources, that can be exploited in the laboratory to detect and reveal carbohydrate structures in or on the surface of cells in very much the same way that antibodies can be used to reveal specific antigens. Lectins can detect very subtle alterations in cellular glycosylation. This is of interest in metastasis research as there is increasing evidence that marked glycosylation changes can attend both transformation to malignancy and tumor progression. Lectins are named after the source from which they are derived-sometimes the Latin binomial (e.g., Bandeirea simplicifolia lectin or Dolichos biflorus lectin), sometimes the common name (e.g., peanut lectin or wheatgerm lectin), or some-times by a slightly obscure historical term (e.g., Concanavalin A [Con A] for the lectin from Canavalia ensiformis, the jack bean). The term lectin is used fairly interchangeably with the older term “agglutinin,” as in peanut agglutinin or Helix pomatia agglutinin. Lectins are often referred to by an abbreviation for their names, for example, PNA (peanut agglutinin) or DBA (Dolichos biflorus agglutinin); obscurely, PHA, which actually stands for phytohaemagglutinin is, for historical reasons, the abbreviation usually employed for the lectin derived from Phaseolus vulgaris. Many sources yield more than one lectin, termed isolectins, which may have quite different carbohydrate binding specificities (e.g., the gorse Ulex europaeus yields two major isolectins, Ulex europaeus agglutinin I [UEA-I], which has a strong binding preference for fucose, and Ulex europaeus agglutinin II [UEA-II], which has a strong binding preference for N-acetylglucosamine).

Keywords

Microwave Acetone Carbohydrate Adenocarcinoma Agarose 

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Copyright information

© Humana Press Inc. 2001

Authors and Affiliations

  • Susan A. Brooks
    • 1
  • Debbie M.S. Hall
    • 1
  1. 1.Research School of Biological and Molecular SciencesOxford Brookes UniversityOxfordUK

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