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American Journal of Pathology, Vol 103, 116-128, Copyright © 1981 by American Society for Investigative Pathology

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Platelet satellitism: an ultrastructural study

CM Payne

The ultrastructural morphology of platelet-polymorph (platelet- polymorphonuclear leukocyte) rosettes was investigated in EDTA- anticoagulated blood obtained from two patients who exhibited the phenomenon of platelet satellitism. Most of the platelet profiles were attached to the polymorph surface by broad areas of contact. Examination of these broad areas of contact at high magnification revealed an intercellular material of low electron density. This material appeared to form strands, which bridged the intercellular space and spanned the entire area formed by the apposing plasma membranes. Phagocytosis of entire platelets was only observed in 1 case. The platelet profiles that participated in rosette formation revealed a large number of glycogen particles, compared with unattached platelets. Ultrastructural examination of "stress" platelets obtained from five normal subjects treated with steroids similarly showed a large number of glycogen particles, although no rosette formation or phagocytosis of platelets was observed. The etiology of platelet satellitism is discussed.




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Copyright © 1981 by the American Society for Investigative Pathology.