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Abstract
The regulation of the negative surface charge density of human monocytes was investigated with the help of the synthetic glycolipid analogue BAY R 1005. This compound is incorporated into the outer membrane of isolated monocytes during 24 hours of incubation. After this time the electrophoretic mobility (EM) of monocytes is unchanged at 0.95 × 10−4 (cm2 V−1 s−1) and remains unchanged even under conditions where non-treated monocytes increase their EM up to 1.1 × 10−4 (cm2 V−1 s−1). In addition BAY R 1005 stops differentiation of monocytes to macrophages, it triggers monokine production and abolishes monocyte suppressor activity and spreading capability. The results show that BAY R 1005 affects intracellular features. In connection with earlier investigations of the regulation of the negative surface charge density of human monocytes (1,2) the study suggests that monokine production and maintenance of the EM of monocytes are linked.