homeostasis/metabolism
• platelet-activating factor (PAF) is almost undetectable in several tissues, including the brain, thymus, liver, spleen, kidney, colon, and spinal cord under steady-state conditions
• however, other phosphatidylcholine (PC) compositions are largely unaltered in these tissues
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• no PAF biosynthetic activity (lyso-PAF acetyltransferase activity) is observed in peritoneal macrophages after stimulation with LPS for 30 min or 18 h, unlike in similarly stimulated wild-type macrophages
• lyso-PAF acyltransferase activity (PC with arachidonic acid, alkyl-PC biosynthesis) is slightly reduced but not absent in LPS-stimulated peritoneal macrophages, possibly due to the activity of other lysophospholipid acyltransferases
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• no platelet-activating factor (PAF) production is detected in peritoneal macrophages after stimulation with the calcium ionophore A23187 or in several tissues, including the spinal cord, under steady-state conditions
• however, no changes in the abundance of other phosphatidylcholines (PCs) are noted in A23187-stimulated macrophages or in spinal cord, brain, thymus, liver, spleen, kidney, and colon tissues
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behavior/neurological
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• at 2 weeks after partial sciatic ligation (PSL), the resultant pain level (allodynia score) in male mice is significantly lower than in wild-type controls, as assessed by stroking the injured leg with a paintbrush
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• after partial sciatic ligation (PSL), mechanical allodynia is largely attenuated in the von Frey filament assay, with male mice showing a significantly higher paw withdrawal threshold than wild-type controls
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