Polyamines preserve connexin 43-mediated gap junctional communication during intracellular hypercalcemia and acidosis
Changes in the regulation, formation, and gating of connexin-based gap junction channels occur in various disorders. It has been shown that H and Ca are involved in the regulation of gap junctional communication. Ischemia-induced intracellular acidification and Ca overload lead to closure of gap jun...
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| Published in: | Neuroreport Vol. 28; no. 4; pp. 208 - 213 |
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| Abstract | Changes in the regulation, formation, and gating of connexin-based gap junction channels occur in various disorders. It has been shown that H and Ca are involved in the regulation of gap junctional communication. Ischemia-induced intracellular acidification and Ca overload lead to closure of gap junctions and inhibit an exchange by ions and small molecules throughout the network of cells in the heart, brain, and other tissues. In this study, we examined the role of the polyamines in the regulation of connexin 43 (Cx43)-based gap junction channels under elevated intracellular concentrations of hydrogen ([H]i) and calcium ([Ca]i) ions. Experiments, conducted in Novikoff and A172 human glioblastoma cells, which endogenously express Cx43, showed that polyamines prevent downregulation of Cx43-mediated gap junctional communication caused by elevated [Ca]i and [H]i, accompanying ischemic and other pathological conditions. siRNA knockdown of Cx43 significantly reduces gap junctional communication, indicating that Cx43 gap junctions are the targets for spermine regulation. |
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| AbstractList | Changes in the regulation, formation, and gating of connexin-based gap junction channels occur in various disorders. It has been shown that H and Ca are involved in the regulation of gap junctional communication. Ischemia-induced intracellular acidification and Ca overload lead to closure of gap junctions and inhibit an exchange by ions and small molecules throughout the network of cells in the heart, brain, and other tissues. In this study, we examined the role of the polyamines in the regulation of connexin 43 (Cx43)-based gap junction channels under elevated intracellular concentrations of hydrogen ([H]i) and calcium ([Ca]i) ions. Experiments, conducted in Novikoff and A172 human glioblastoma cells, which endogenously express Cx43, showed that polyamines prevent downregulation of Cx43-mediated gap junctional communication caused by elevated [Ca]i and [H]i, accompanying ischemic and other pathological conditions. siRNA knockdown of Cx43 significantly reduces gap junctional communication, indicating that Cx43 gap junctions are the targets for spermine regulation. |
| Author | Benedikt, Jan Kucheryavykh, Lilia Y Cubano, Luis A Kucheryavykh, Yuriy V Skatchkov, Serguei N Bukauskas, Feliksas F |
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| SubjectTerms | Acidosis Animals Calcium Cell Line, Tumor Connexin 43 - metabolism Gap Junctions - drug effects Gap Junctions - physiology Humans Hydrogen-Ion Concentration Hypercalcemia Neurons - metabolism Neurons - physiology Polyamines - administration & dosage Rats Spermine - administration & dosage |
| Title | Polyamines preserve connexin 43-mediated gap junctional communication during intracellular hypercalcemia and acidosis |
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