RT Journal Article SR Electronic T1 Optogenetic Activation of Non-Nociceptive Aβ Fibers Induces Neuropathic Pain-Like Sensory and Emotional Behaviors after Nerve Injury in Rats JF eneuro JO eNeuro FD Society for Neuroscience SP ENEURO.0450-17.2018 DO 10.1523/ENEURO.0450-17.2018 VO 5 IS 1 A1 Ryoichi Tashima A1 Keisuke Koga A1 Misuzu Sekine A1 Kensho Kanehisa A1 Yuta Kohro A1 Keiko Tominaga A1 Katsuyuki Matsushita A1 Hidetoshi Tozaki-Saitoh A1 Yugo Fukazawa A1 Kazuhide Inoue A1 Hiromu Yawo A1 Hidemasa Furue A1 Makoto Tsuda YR 2018 UL http://www.eneuro.org/content/5/1/ENEURO.0450-17.2018.abstract AB Neuropathic pain is caused by peripheral nerve injury (PNI). One hallmark symptom is allodynia (pain caused by normally innocuous stimuli), but its mechanistic underpinning remains elusive. Notably, whether selective stimulation of non-nociceptive primary afferent Aβ fibers indeed evokes neuropathic pain-like sensory and emotional behaviors after PNI is unknown, because of the lack of tools to manipulate Aβ fiber function in awake, freely moving animals. In this study, we used a transgenic rat line that enables stimulation of non-nociceptive Aβ fibers by a light-activated channel (channelrhodopsin-2; ChR2). We found that illuminating light to the plantar skin of these rats with PNI elicited pain-like withdrawal behaviors that were resistant to morphine. Light illumination to the skin of PNI rats increased the number of spinal dorsal horn (SDH) Lamina I neurons positive to activity markers (c-Fos and phosphorylated extracellular signal-regulated protein kinase; pERK). Whole-cell recording revealed that optogenetic Aβ fiber stimulation after PNI caused excitation of Lamina I neurons, which were normally silent by this stimulation. Moreover, illuminating the hindpaw of PNI rats resulted in activation of central amygdaloid neurons and produced an aversion to illumination. Thus, these findings provide the first evidence that optogenetic activation of primary afferent Aβ fibers in PNI rats produces excitation of Lamina I neurons and neuropathic pain-like behaviors that were resistant to morphine treatment. This approach may provide a new path for investigating circuits and behaviors of Aβ fiber-mediated neuropathic allodynia with sensory and emotional aspects after PNI and for discovering novel drugs to treat neuropathic pain.