Endothelial cells of the meningeal capillaries in the rainbow trout: a freeze-fracture study.
Meningeal capillaries are unfenestrated. They are made up of endothelial cells that have a pinocytotic caveolae density of 41+/- 11/micron (2) and 89 +/- 21/ micron(2) the abluminal and luminal sides respectively. The total density of intramembrane particles is not significantly different between the luminal and the abluminal membranes;however, the coefficients of partition are significantly different (P < 0.001).One or two strands of tight junctions occur between adjacent cells but no gap junctions nor desmosomes exist. The density of nuclear pores is less than 3.2/micron(2). An abundance of intermediate filaments and free vesicles, some of which are seriated, characterize the cytoplasm. The functional significance of these findings is discussed.
Caruncho
H J
HJ
Department of Fundamental Biology, University of Santiago De Compostela, E-15706 Santiago de Compostela, Spain.
Anadon
R
R