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Freeze-fracture investigation of the red pulp of human spleen

Summary

This study concerns the morphology of the human spleen in freeze-fracture replicas and compares this with the findings in ultrathin sections. The material investigated consisted of two spleens resected at gastrectomy and one resected because of splenomegaly in a case of hairy cell leukaemia. The current concepts concerning the ultrastructure of the spleen were generally confirmed with the freeze-fracture technique. The sinus walls were found, as expected, to consist of closely fitting endothelial cells, which were identifiable in freezefracture replicas by numerous caveolae of the cell membrane. Contrary to the opinion upheld in the literature, the sinus endothelial cells were occasionally found to be connected by desmosomes or maculae adhaerentes. Corresponding to the finding of desmosomes in ultrathin sections, focal collections of intramembranous particles were observed in freeze-fracture replicas and a positive immunohistochemical reaction for desmoplakin in the sinuses was found at the light microscopic level. The view generally held in the literature that sinus endothelial cells can exhibit tight junctions was not confirmed. However, such junctions were found between vascular endothelial cells. The ring fibres of the sinuses, which are closely connected to the sinus endothelial cells through contractile fibres, apparently have various functions. Firstly, they contribute towards maintaining mechanical stability. Secondly, they represent basement membranes through which exchange occurs between the sinus endothelial cells and their surroundings. This is indicated by the caveolae and vesicles that are often found here in large numbers and in focal collections. Hairy cells exhibit no features in freeze-fracture replicas to suggest a cytogenetic relationship to interdigitating reticulum cells.

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Kaiserling, E., Wolburg, H. & Banks, P. Freeze-fracture investigation of the red pulp of human spleen. Virchows Archiv B Cell Pathol 58, 15–25 (1989). https://doi.org/10.1007/BF02890056

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  • DOI: https://doi.org/10.1007/BF02890056

Key words

  • Spleen
  • Hairy cell leukaemia
  • Sinus wall cells
  • Electron microscopy
  • Freeze-fracturing