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• W2491620993 abstract "Background Application of inflammatory mediators to the cranial dura has been used as a method to activate and sensitize neurons in the meningeal sensory pathway in preclinical behavioral studies of headache mechanisms. However, the relatively high concentrations and volumes used in these studies raise the question of whether the applied agents might pass through the dura to act directly on central neurons, thus bypassing the dural afferent pathway. Methods We used a radiolabeling approach to quantify the meningeal permeability of two of the inflammatory mediators, 5-HT and PGE 2 , when applied to the cranial dura as part of an inflammatory mixture used in preclinical headache models. Results Both agents could be detected in samples taken four hours after dural application in the cerebrospinal fluid (CSF) and, in measurements made only for PGE 2 , in the central nervous system (CNS) as well. Based on our measurements, we made estimates of the CSF and CNS levels that would be attained with the higher concentrations and volumes of 5HT and PGE 2 that were exogenously applied in previous pre-clinical headache studies. These estimated levels were comparable to or larger than normal endogenous levels, potentially large enough to have physiological effects. Conclusions The finding that the cranial meninges are permeable to the two tested inflammatory mediators PGE 2 and 5-HT raises some uncertainty about whether the behavioral changes observed in prior pre-clinical headache studies with these as well as other agents can be attributed entirely to the activation of dural nociceptors, particularly when the agents are applied at concentrations several orders of magnitude above physiological levels." @default.
• W2491620993 created "2016-08-23" @default.
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• W2491620993 date "2016-08-19" @default.
• W2491620993 modified "2023-10-14" @default.
• W2491620993 title "Cranial dural permeability of inflammatory nociceptive mediators: Potential implications for animal models of migraine" @default.
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• W2491620993 doi "https://doi.org/10.1177/0333102416663466" @default.
• W2491620993 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/5774025" @default.
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