Summary
Isolated granulocytes from normal individuals and patients suffering from chronic myeloid leukemia (CML) displayed different fluorescent patterns on treatment with fluorescein isothiocyanate concanavalin A (Fl-Con A). The ligand was internalized by 86% of the normal granulocytes, while 80% of the leukemic granulocytes exhibited Fl-Con A localized on the cell periphery. In further experiments, pretreatment of the normal granulocytes with cytochalasin B, iodoacetamide, 2-deoxyglucose and sodium fluoride (but not with sodium azide or dinitrophenol) was found to drastically inhibit internalization of the ligand. However, pretreatment of granulocytes from CML patients with cytochalasin B and 2-deoxyglucose, caused only a little alteration in the pattern of Fl-Con A labelling relative to untreated cells. These results indicate that CML granulocytes are defective in their ability to endocytose Fl-Con A. We suggest that this differential interaction between Fl-Con A and normal and leukemic granulocytes is a convenient system to study the initial steps in receptor mediated endocytosis of Concanavalin A.
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Zingde, S.M., Anklesaria, P.N., Advani, S.H. et al. Differential endocytosis of fluorescein iso-thiocyanate-concanavalin A by normal and chronic myeloid leukemic granulocytes. Blut 55, 81–88 (1987). https://doi.org/10.1007/BF00631777
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DOI: https://doi.org/10.1007/BF00631777