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Elimination of phagocytic cells in the spleen after intravenous injection of liposome-encapsulated dichloromethylene diphosphonate. Ultrastructural aspects of elimination of marginal zone macrophages.


It is shown ultrastructurally that intravenously injected and liposome-entrapped dichloromethylene diphosphonate (DMDP) causes marked damage to marginal zone macrophages in the mouse spleen which finally results in the elimination of these cells. Marginal zone lymphocytes are also affected by this treatment, probably as a result of action of the enzymes released by dying macrophages. Marginal zone macrophages largely disappear, 24 h after i.v. injection, leaving an open-meshed reticulum in which a few viable and necrotic lymphocytes are present. The proposed method to eliminate macrophages for some time may be used to study functional aspects of these cells in vivo.

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