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2014 ; 12
(3
): 136-43
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Alteration of cell-cell junctions in cultured human lymphatic endothelial cells
with inflammatory cytokine stimulation
#MMPMID25166264
Kakei Y
; Akashi M
; Shigeta T
; Hasegawa T
; Komori T
Lymphat Res Biol
2014[Sep]; 12
(3
): 136-43
PMID25166264
show ga
BACKGROUND: To maintain normal function, the lymphatic endothelium is regulated
by cell-cell junctions. There have been few studies of lymphatic endothelial cell
junctions using standard cell biological methods. This study had two purposes: to
characterize cell junctions in cultured lymphatic endothelial cells and to
investigate the effects of the inflammatory cytokine TNF-? on altered cell-cell
junctions. METHODS AND RESULTS: Cultured human dermal lymphatic endothelial cells
(HDLEC) were immunostained with the tight junction marker, ZO-1, and adherens
junction markers, VE-cadherin and PECAM-1. In TNF-?-treated HDLEC, we evaluated
changes in endothelial cell junctions by immunostaining and through the use of
transendothelial electrical resistance (TER). Immunofluorescence staining of
HDLEC revealed heterogeneity among the endothelial cell junctions, which could be
classified into continuous and discontinuous junctions. In these cell junctions,
ZO-1 and VE-cadherin were co-localized. Double immunofluorescence staining
revealed the broad distribution of VE-cadherin at the cell periphery, where
VE-cadherin and PECAM-1 were co-localized. TNF-? treatment decreased TER, caused
a predominance in the appearance of discontinuous junctions with a reduction in
the broad distribution of VE-cadherin at the cell periphery in HDLEC.
CONCLUSIONS: The results indicate a heterogeneous distribution of cell junctions
in HDLEC involving continuous and discontinuous junctions. Our data also suggest
that TNF-? alters the normal distribution of cell junctions and affects the
endothelial barrier of cultured lymphatic endothelial cells. The broad
distribution of VE-cadherin at the cell periphery may reflect the lymphatic
permeability.