Abstract
The Kurloff cell (KC), a natural killer lymphocyte, contains a large (10-microns diameter) periodic acid-Schiff (PAS)-positive lysosome-like inclusion body called the Kurloff body (KB), which exhibits strong acid phosphatase activity. The presence of Sambucus nigra agglutinin (SNA)-reactive Neu5Ac(alpha 2,6)-D-Gal/Gal-NAc(beta 1,4)GlcNAc oligosaccharide sequences and the absence of the corresponding Neu5Ac(alpha 2,3) Maackia amurensis agglutinin (MAA)-reactive sequence in the major 35-kDa N-glycosylproteins of the complex or hybrid type extracted from purified KC were established by Western-lectin-blotting of cytosolic extracts from purified KC. Moreover, these SNA-reactive sequences, or at least part of them, were shown to be borne by sialidase-sensitive KC acid isophosphatases. Thymic sections rich in KC, from estrogenized guinea pigs were examined by affino-histochemistry with these sialic acid-reactive lectins. The SNA-reactivity of thymic sections was quasi-exclusively confined to KC clusters, whereas the whole thymic section was negative for MAA. KC were not SNA-reactive following preincubation and incubation with 200 mM lactose. When submitted to enzymatic or mild chemical desialylation processes, the SNA-reactivity of t...Continue Reading
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