Abstract
Objective
To study the effects of estrogen on transendothelial paracellular permeability in women.
Methods
Human umbilical vein endothelial cells (HUVEC) obtained from women were grown on filters. The paracellular permeability characteristics were determined in terms of changes in the prmeability to the polar acid pyranine (Ppyr) and as changes in the transendothelial electrical resistance (RTE). Tight junctional resistance characteristics were assayed by lowering luminal NaCl and measuring the dilution potential, and were expressed as the ratio of monion mobility uCl/uNa (cation selectivity).
Results
Low extracellular calcium and hyperosmolarity increased Ppyr and decreased RTE. The former but not the latter condition abolished the endothelium-specific cation selectivity. Treatment with 10 nM of estradiol-17β had no effect on RTE, but it increased the cation selectivity. The effect of estradiol required 1-6 hours’ incubation with the hormone; it was dose dependent and saturable, with a median effective concentration of estradiol of 1 nM. Diethylstilbestrol, but not estriol, could mimic the effect of estradiol, and the estrogen rectpro antagonist ICI-182,780 blocked it.
Conclusion
Cultured HUVEC cells from patent tight junctions. Estrogens increase the cation selectivity across HUVEC cultures. The effect of estrogen may be mediated by an estrogen receptor. These effects may be important for vasculoprotection in cases of sudden changes in ions levels across the capillary wall, such as ischemia or reperfusion.
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Supported in part by grants from Bristol Myers Squibb Company (US Phannaceuticals) to G. 1. G., and from the National Institutes of Health, Heart. Lung, and Blood Institute. Grant HL-48771, to N. P. Z. Dr. Alan Wakeling (Zeneca Pharmaceuticals) is acknowl edged for providing the ICI–182,780.
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Cho, M.M., Ziats, N.P., Abdul-Karim, F.W. et al. Effects of Estrogen on Tight Junctional Resistance in Cultured Human Umbilical Vein Endothelial Cells. Reprod. Sci. 5, 260–270 (1998). https://doi.org/10.1177/107155769800500507
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DOI: https://doi.org/10.1177/107155769800500507