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Department of Internal Medicine, University of Iowa College of Medicine, Iowa City, Iowa 52242
Histamine
increases microvascular permeability by creating small transitory
(100-400 nm) gaps between adjacent endothelial cells at sites of
vascular endothelial (VE)-cadherin-based adhesion. We examined the
effects of histamine on the proteins within the VE-cadherin-based
adherens junction in primary human umbilical vein endothelial cells.
VE-cadherin is linked not only by
- and
-catenin to cortical
actin but also by
-catenin to the intermediate filament vimentin. In
mature human umbilical vein cultures, the VE-cadherin immunoprecipitate
contained equivalent amounts of
- and
-catenin, 130% as much
- as
-catenin, and 50% as much actin as vimentin. Within 60 s, histamine decreased the fraction of VE-cadherin in the insoluble
portion of the cell lysate by 35 ± 1.5%. At the same time,
histamine decreased the amount of vimentin that immunoprecipitated with
VE-cadherin by 50 ± 6%. Histamine did not affect the amount of
actin or the amount of
-,
-, or
-catenin that
immunoprecipitated with VE-cadherin. Within 60 s, histamine
simulated a doubling in the phosphorylation of VE-cadherin and
- and
-catenin. The VE-cadherin immunoprecipitate contained kinase
activity that phosphorylated VE-cadherin and
-catenin in vitro.
vascular endothelial cadherin; adhesion
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