The Biphasic Effect of Lipopolysaccharide on Membrane Potential
Lipopolysaccharide (LPS) from certain strains of Gram-negative bacteria can induce a rapid (<1 s) hyperpolarization of membrane potential, followed by a gradual depolarization exceeding the initial resting membrane potential. Through overexpression of a <i>Drosophila</i> ORK1 two-pore...
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MDPI AG
2025-03-01
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| Series: | Membranes |
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| Online Access: | https://www.mdpi.com/2077-0375/15/3/74 |
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| author | Maria E. Hadjisavva Robin L. Cooper |
| author_facet | Maria E. Hadjisavva Robin L. Cooper |
| author_sort | Maria E. Hadjisavva |
| collection | DOAJ |
| description | Lipopolysaccharide (LPS) from certain strains of Gram-negative bacteria can induce a rapid (<1 s) hyperpolarization of membrane potential, followed by a gradual depolarization exceeding the initial resting membrane potential. Through overexpression of a <i>Drosophila</i> ORK1 two-pore-domain K<sup>+</sup> channel (K2P) in larval muscles and altering the external concentrations of K<sup>+</sup> and Na<sup>+</sup> ions, it is clear that the hyperpolarization is due to activating K2P channels and the depolarization is due to promoting an inward Na<sup>+</sup> leak. When the external Na<sup>+</sup> concentration is negligible, the LPS-delayed depolarization is dampened. The hyperpolarization induced by LPS can exceed −100 mV when external K<sup>+</sup> and Na<sup>+</sup> concentrations are lowered. These results indicate direct action by LPS on ion channels independently of immune responses. Such direct actions may need to be considered when developing clinical treatments for certain forms of bacterial septicemia. |
| format | Article |
| id | doaj-art-e495f283daee4370b1073384b7a702c2 |
| institution | OA Journals |
| issn | 2077-0375 |
| language | English |
| publishDate | 2025-03-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Membranes |
| spelling | doaj-art-e495f283daee4370b1073384b7a702c22025-08-20T01:48:41ZengMDPI AGMembranes2077-03752025-03-011537410.3390/membranes15030074The Biphasic Effect of Lipopolysaccharide on Membrane PotentialMaria E. Hadjisavva0Robin L. Cooper1Department of Biology, University of Kentucky, Lexington, KY 40506-0225, USADepartment of Biology, University of Kentucky, Lexington, KY 40506-0225, USALipopolysaccharide (LPS) from certain strains of Gram-negative bacteria can induce a rapid (<1 s) hyperpolarization of membrane potential, followed by a gradual depolarization exceeding the initial resting membrane potential. Through overexpression of a <i>Drosophila</i> ORK1 two-pore-domain K<sup>+</sup> channel (K2P) in larval muscles and altering the external concentrations of K<sup>+</sup> and Na<sup>+</sup> ions, it is clear that the hyperpolarization is due to activating K2P channels and the depolarization is due to promoting an inward Na<sup>+</sup> leak. When the external Na<sup>+</sup> concentration is negligible, the LPS-delayed depolarization is dampened. The hyperpolarization induced by LPS can exceed −100 mV when external K<sup>+</sup> and Na<sup>+</sup> concentrations are lowered. These results indicate direct action by LPS on ion channels independently of immune responses. Such direct actions may need to be considered when developing clinical treatments for certain forms of bacterial septicemia.https://www.mdpi.com/2077-0375/15/3/74bacteriaendotoxinK2Plipopolysaccharidemembrane potentialNALCN |
| spellingShingle | Maria E. Hadjisavva Robin L. Cooper The Biphasic Effect of Lipopolysaccharide on Membrane Potential Membranes bacteria endotoxin K2P lipopolysaccharide membrane potential NALCN |
| title | The Biphasic Effect of Lipopolysaccharide on Membrane Potential |
| title_full | The Biphasic Effect of Lipopolysaccharide on Membrane Potential |
| title_fullStr | The Biphasic Effect of Lipopolysaccharide on Membrane Potential |
| title_full_unstemmed | The Biphasic Effect of Lipopolysaccharide on Membrane Potential |
| title_short | The Biphasic Effect of Lipopolysaccharide on Membrane Potential |
| title_sort | biphasic effect of lipopolysaccharide on membrane potential |
| topic | bacteria endotoxin K2P lipopolysaccharide membrane potential NALCN |
| url | https://www.mdpi.com/2077-0375/15/3/74 |
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