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• W1572174795 endingPage "758" @default.
• W1572174795 startingPage "742" @default.
• W1572174795 abstract "Headache, muscle aches and chest pain of mild to medium intensity are among the most common clinical symptoms in moderate Staphylococcus aureus infections, with severe infections usually associated with worsening pain symptoms. These nociceptive responses of the body raise the question of how bacterial infection impinges on the nervous system. Does S. aureus, or its released virulence factors, act directly on neurones? To address this issue, we evaluated the potential effects on neurones of certain bi-component leukotoxins, which are virulent factors released by the bacterium. The activity of four different leukotoxins was verified by measuring the release of glutamate from rat cerebellar granular neurones. The bi-component γ-haemolysin HlgC/HlgB was the most potent leukotoxin, initiating transient rises in intracellular Ca2+ concentration in cerebellar neurones and in primary sensory neurones from dorsal root ganglia, as probed with the Fura-2 Ca2+ indicator dye. Using pharmacological antagonists of receptors and Ca2+ channels, the variations in intracellular Ca2+ concentration were found independent of the activation of voltage-operatedCa2+ channels or glutamate receptors. Drugs targeting Sarco-Endoplasmic Reticulum Ca2+-ATPase (SERCA) or H+-ATPase and antagonists of the store-operated Ca2+ entry complex blunted, or significantly reduced, the leukotoxin-induced elevation in intracellular Ca2+. Moreover, activation of the ADP-ribosyl cyclase CD38 was also required to initiate the release of Ca2+ from acidic stores. These findings suggest that, prior to forming a pore at the plasma membrane, leukotoxin HlgC/HlgB triggers a multistep process which initiates the release of Ca2+ from lysosomes, modifies the steady-state level of reticular Ca2+ stores and finally activates the Store-Operated Calcium Entry complex." @default.
• W1572174795 created "2016-06-24" @default.
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• W1572174795 creator A5083803189 @default.
• W1572174795 date "2012-12-06" @default.
• W1572174795 modified "2023-10-14" @default.
• W1572174795 title "Staphylococcal leukotoxins trigger free intracellular<scp><scp>Ca</scp></scp>²⁺rise in neurones, signalling through acidic stores and activation of store‐operated channels" @default.
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• W1572174795 doi "https://doi.org/10.1111/cmi.12069" @default.
• W1572174795 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/3654557" @default.
• W1572174795 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/23152983" @default.
• W1572174795 hasPublicationYear "2012" @default.
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