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. 1992 Dec;107(4):932–938. doi: 10.1111/j.1476-5381.1992.tb13388.x

Modulation of barrier function of bovine aortic and pulmonary artery endothelial cells: dissociation from cytosolic calcium content.

K W Buchan 1, W Martin 1
PMCID: PMC1907918  PMID: 1334754

Abstract

1. Barrier function and cytosolic free calcium content [Ca2+]i was measured in monolayers of bovine pulmonary artery endothelial cells (BPAEC) and bovine aortic endothelial cells (BAEC). 2. Thrombin (1 u ml-1) increased albumin transfer across monolayers of BPAEC but not BAEC, yet induced biphasic increases in [Ca2+]i in both endothelial cell types, consisting of a rapid, initial phasic component which decayed to a lower, more sustained plateau phase. 3. 4 beta-Phorbol 12-myristate 13-acetate (PMA; 0.3-3000 nM) increased albumin transfer across monolayers of BPAEC and BAEC, but had no effect on basal levels of [Ca2+]i in either endothelial cell type. 4. Treatment of BPAEC and BAEC with forskolin (30 microM), an activator of adenylate cyclase, had no effect on resting transfer of albumin, but inhibited that stimulated by PMA (600 nM). It also inhibited the thrombin (1 u ml-1)-induced increase in albumin transfer across monolayers of BPAEC, but enhanced the plateau phase of the associated increase in [Ca2+]i. 5. Treatment of BPAEC and BAEC with either atriopeptin II (100 nM), an activator of particulate guanylate cyclase, or 8 bromo cyclic GMP (30 microM) had no effect on resting or PMA (600 nM)-stimulated transfer of albumin. Both agents did, however, inhibit the thrombin (1 u ml-1)-induced increase in albumin transfer across monolayers of BPAEC, but had no effect on the associated increase in [Ca2+]i. 6. These data suggest a dissociation between the ability of agents that increase or decrease albumin transfer and their effects on [Ca2+]i.(ABSTRACT TRUNCATED AT 250 WORDS)

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Selected References

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