Summary
Pre- and post-embedding techniques were used to investigate the ultrastructural binding of a range of lectins to the haemocytes of the mussel Mytilus edulis. Direct and indirect labelling procedures were employed using colloidal gold and ferritin-labelled lectins, or biotinylated lectins followed by gold-labelled streptavidin. Cell surface receptors were present for lectins from Helix pomatia (HPA), Helix aspersa (HAA), Triticum vulgaris (WGA) and Tetragonolobus purpureas (TPA). Double labelling of haemocytes with HPA and WGA demonstrated binding sites for both lectins on the plasma membrane of the majority of haemocytes. Endocytosis of colloidal gold-labelled HPA was observed for unfixed haemocytes. Three classes of haemocyte were identified by use of morphological criteria: hyalinocytes; granulocytes containing small granules; and granulocytes containing large granules. Lectin binding showed the small granules of the granulocytes to be HPA-positive and the large granules of the granulocytes to be WGA-positive. The WGA-positive granules demonstrated a differential pattern of binding according to granule size. Binding sites for the lectin from Arachis hypogaea (PNA) were not demonstrated on the cell surface, but did show an affinity for the heterochromatin region of the nucleus in post-embedding protocols.
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Pipe, R.K. Differential binding of lectins to haemocytes of the mussel Mytilus edulis . Cell Tissue Res 261, 261–268 (1990). https://doi.org/10.1007/BF00318667
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DOI: https://doi.org/10.1007/BF00318667