Characterization of asialo GM1 positive splenic lymphocytes in Mongolian gerbils

Correlation between canine NK cell mediated cytotoxicity and radical production

We investigated the relationship between natural killer (NK) mediated cytotoxicity and radical production in canine peripheral blood lymphocytes (PBLs). Canine NK cell mediated cytotoxicity, measured by 51Cr release assay, was found to be the highest in the T-cell (Thymus cell) subpopulation which partitioned into the 35-40% percoll fraction by centrifugation through a discontinuous gradient. Radical production showed a similar tendency in luminol-dependent chemiluminescence (CL) assay. Furthermore, enrichment of large granular lymphocytes (LGL) was observed in the cell fraction from the same percoll density. These results suggest that NK cell mediated cytotoxicity is related to radical production in canines.

Magnificent expression of asialo GM1 on thymus cells and spleen T cells of the musk shrew, Suncus murinus

The expression of asialo GM1 (GA1) was observed on almost all thymocytes from young musk shrew, at the age of 4 weeks by flow cytometric analysis. In adult shrew aged 10 months, the ratio of GA1-negative thymocytes was increased. Among several anti-glycolipid antibodies used, anti-GM1 and anti-Forssman also reacted with the thymocytes. Protein fraction of the thymocytes was analyzed by SDS-PAGE followed by immunoblotting. Anti-GA1 and anti-GM1 showed two bands and one band, respectively, however, their mobilities were different from each other. Anti-Forssman did not stain any protein. The GA1-positive population in spleen T cell fraction was not detected in young shrew but most of the T cells were changed to GA1-positive cells in adult shrew. When mixed lymphocyte culture was performed, the GA1-negative spleen T cells in young shrew were changed to express GA1 marker on their cell surface by differentiation. Abbreviations used were as follows: GA1, Gal beta 1-3GalNAc beta 1-4Gal beta 1-4Glc-Cer; GM1, Gal beta 1-3GalNAc beta 1-4(NeuAc alpha 2-3)Gal beta 1-4Glc-Cer; Forssman, GalNAc alpha 1-3GalNAc beta 1-3Gal alpha 1-4Gal beta 1-4Glc-Cer.