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• W2000629910 abstract "Cerebral ischemia/reperfusion (I/R) results in cellular energy failure and dysfunction of the neurovascular unit that contribute to subsequent neuronal cell death in the neonate. PX-18 is a putative neuroprotective inhibitor of secretory phospholipase A(2) (sPLA(2)) but its in vivo testing has been limited by its poor solubility. Our purpose was to assess whether PX-18 preserved neuronal-vascular reactivity to I/R-sensitive endothelium-dependent (hypercapnia, bradykinin) and/or neuron-dependent (N-methyl-D-aspartate; NMDA) stimuli. To make the drug available for in vivo studies, PX-18 was formulated as a 3% nanosuspension applying high pressure homogenization. Newborn piglets (1-day old, n=40) were anesthetized and ventilated, and cerebrovascular reactivity to the above stimuli was determined by measuring changes in pial arteriolar diameters using the closed cranial window/intravital videomicroscopy technique. Intravenous infusion of PX-18 nanosuspension (6 mg/kg, 20 min) did not affect baseline arteriolar diameters, or hypercapnia-, bradykinin-, or NMDA-induced pial arteriolar vasodilation under normoxic conditions. Global cerebral ischemia (10 min) followed by 1 h of reperfusion significantly attenuated hypercapnia-, bradykinin-, and NMDA-induced vasodilation in untreated or vehicle-treated controls. However, PX-18 resulted in nearly full preservation of cerebrovascular reactivity to all these stimuli. In conclusion, inhibition of sPLA(2) by PX-18 improves neurovascular function both at the neuronal and the microvascular level following I/R. This effect of PX-18 likely contributes to its neuroprotective effect." @default.
• W2000629910 created "2016-06-24" @default.
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• W2000629910 date "2009-09-01" @default.
• W2000629910 modified "2023-10-14" @default.
• W2000629910 title "Secretory phospholipase A2 inhibitor PX-18 preserves microvascular reactivity after cerebral ischemia in piglets" @default.
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• W2000629910 doi "https://doi.org/10.1016/j.mvr.2009.06.004" @default.
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