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Purinergic receptor-induced changes in paracellular resistance across cultures of human cervical cells are mediated by two distinct cytosolic calcium-related mechanisms

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Abstract

In human cervical (CaSki) cells, extracellular adenosine triphosphate (ATP) induces an acute decrease in the resistance of the lateral intercellular space (R LIS), phase I response, followed by an increase in tight junctional resistance (R TJ), phase II response. ATP also stimulates release of calcium from intracellular stores, followed by augmented calcium influx, and both effects have similar sensitivities to ATP (EC50 of 6 μM). The objective of the study was to determine the degree to which the changes in [Ca2+]i mediate the responses to ATP. 1,2-bis (2-aminophenoxy) ethane-N,N,N1,N1-tetraacetic acid (BAPTA) abrogated calcium mobilization and phase I response; in contrast, nifedipine and verapamil inhibited calcium influx and attenuated phase II response. Barium, La3+, and Mn2+ attenuated phase I response and attenuated and shortened the ionomycin-induced phase I-like decrease inR LIS, suggesting that store depletion-activated calcium entry was inhibited. Barium and La3+ also inhibited the ATP-induced phase II response, but Mn2+ had no effect on phase II response, and in the presence of low extracellular calcium it partly restored the increase inR TJ. KCl-induced membrane depolarization stimulated an acute decrease inR LIS and a late increase inR TJ similar to ATP, but only the latter was inhibited by nifedipine. KCl also induced a nifedipine-sensitive calcium influx, suggesting that acute increases in [Ca2+]i, regardless of mobilization or influx, mediate phase I response. Phase II-like increases inR TJ could be induced by treatment with diC8, and were not affected by nifedipine. Biphasic ATP-like changes inR TE could be induced by treating the cells with ionomycin plus diC8. We conclude that calcium mobilization mediates the early decrease inR LIS, and calcium influx via calcium channels activates protein kinase C and mediates the late increase inR TJ.

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Authors and Affiliations

  1. Departments of Reproductive Biology, Case Western Reserve University School of Medicine, Cleveland, OH

    George I. Gorodeski

  2. Department of Physiology and Biophysics, Case Western Reserve University School of Medicine, Cleveland, OH

    George I. Gorodeski, George I. Gorodeski, Ulrich Hopfer & Wenwu Jin

Authors
  1. George I. Gorodeski
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  2. Ulrich Hopfer
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  3. Wenwu Jin
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Correspondence to George I. Gorodeski.

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Gorodeski, G.I., Hopfer, U. & Jin, W. Purinergic receptor-induced changes in paracellular resistance across cultures of human cervical cells are mediated by two distinct cytosolic calcium-related mechanisms. Cell Biochem Biophys 29, 281–306 (1998). https://doi.org/10.1007/BF02737899

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