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- W2753506986 abstract "Osteoarthritis (OA) is a disabling and highly prevalent condition affecting millions worldwide. Pain is the major complaint of OA patients and is presently inadequately managed. It manifests as mechanical allodynia, a painful response to innocuous stimuli such as joint movement. Allodynia is due in part to the sensitization of articular nociceptors to mechanical stimuli. These nociceptors respond to noxious mechanical stimuli applied to their terminals via the expression of depolarizing high-threshold mechanosensitive ion channels (MSICs) that convert painful mechanical forces into electrical signals. In this study, we examined the contribution of MSICs to mechanical allodynia in a mouse model of OA.Sodium mono-iodoacetate (MIA) was injected in the left knee of adult male Trpv1:Cre; GFP mice. Primary mechanical allodynia was monitored using the knee-bend test. Single-channel patch clamp electrophysiology was performed on visually-identified knee-innervating nociceptors. Dorsal horn neuronal activation was assessed by Fos immunoreactivity.In examining the gating properties of MSICs of naïve and OA mice, we discovered that their activation threshold is greatly reduced, causing their opening at significantly lower stimuli intensities. Consequently, nociceptors are activated by mild mechanical stimuli. These channels are reversibly inhibited by the selective MSIC inhibitor GsMTx4, and the intra-articular injection of this peptide significantly reduced the activation of dorsal horn nociceptive circuits and primary mechanical allodynia in OA mice.These results suggest that MSICs are sensitized during OA and directly contribute to mechanical allodynia. They therefore represent potential therapeutic targets in the treatment of OA pain." @default.
- W2753506986 created "2017-09-15" @default.
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- W2753506986 date "2017-12-01" @default.
- W2753506986 modified "2023-10-10" @default.
- W2753506986 title "Mechanosensitive ion channels in articular nociceptors drive mechanical allodynia in osteoarthritis" @default.
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- W2753506986 doi "https://doi.org/10.1016/j.joca.2017.08.012" @default.
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