Trabecular meshworks in the sinusoidal endothelial cells of the golden hamster liver: a freeze-fracture study.
Trabecular meshworks (TMs) in the sinusoidal endothelial cells of fasted-refed golden hamster liver were studied in thin sections and in freeze-fracture replicas. TM was a plasmalemma-attached reticulum of anastomosing trabeculae composed of the plasmalemma and cytosol. The surface of TM appeared as a sieve on the plasmalemma. The floor of TM appeared as a depression with snapped trabeculae on the P-face plasmalemma and as a mound, or inverted depression, with pits containing snapped trabeculae on the E-face plasmalemma. Faint ridges were seen connecting some trabeculae on the P-face plasmalemma, whereas furrows lined with intramembranous particles (IMPs) were seen spanning some trabeculae on the E-face plasmalemma. Circles of lined IMPs (IMP-circles) were seen on the E-face plasmalemma, either alone or in association with TMs. Plasmalemmal invaginations were often centered in IMP-circles and were sometimes seen in a cluster. TMs were often blended with the sieve plates.
Department of Anatomy, Gunma University School of Medicine, Maebashi, Japan.
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Taira
D000818:Animals; D002462:Cell Membrane / Q000648:ultrastructure; D006224:Cricetinae; D003600:Cytosol / Q000648:ultrastructure; D004727:Endothelium / Q000166:cytology* / Q000648:ultrastructure; D005260:Female; D005614:Freeze Fracturing; D007425:Intracellular Membranes / Q000648:ultrastructure; D008099:Liver / Q000166:cytology* / Q000648:ultrastructure; D008297:Male; D008647:Mesocricetus / Q000033:anatomy & histology*; D008854:Microscopy, Electron