title: Plantar injection of formalin in rats reduces the expression of a potassium chroride cotransporter KCC2 in the spinal cord and a kinase inhibitor suppresses this reduction.
abstract: Brain-derived neurotrophic factor (BDNF) is released from activated microglia during neuropathic pain and is hypothesized to downregulate the expression of the potassium chloride cotransporter 2 (KCC2) via the TrkB receptor. Previous studies reported that KCC2 is downregulated 5 min after the plantar injection of formalin in rats; however, the mechanism behind this decrease in KCC2 expression during acute inflammatory pain remains unknown. In this study, we determined whether the TrkB receptor contributes to the expression of KCC2 during the acute pain. Five minutes after the plantar injection of formalin in rats, the ratio of KCC2-immunoreactive area in layer II of the spinal cord significantly decreased on the stimulated side compared to the unaffected side. On the other hand, this response was inhibited by the injection of a kinase inhibitor, K252a, in the subarachnoid space 15 min before the formalin injection. These findings suggest that in acute pain, the TrkB receptor may contribute to the decrease in the expression of KCC2.
authors.forename: Kenkichi
authors.initials: K
authors.lastname: Tsuruga
authors.forename: Toshikazu
authors.initials: T
authors.lastname: Hashimoto
authors.forename: Ryoko
authors.initials: R
authors.lastname: Kato
authors.forename: Rui
authors.initials: R
authors.lastname: Kato
authors.forename: Yousuke
authors.initials: Y
authors.lastname: Uchida
authors.forename: Tetsutaro
authors.initials: T
authors.lastname: Hase
authors.forename: Yuji
authors.initials: Y
authors.lastname: Morimoto
mesh_terms: D000818:Animals; D002227:Carbazoles / Q000494:pharmacology*; D004791:Enzyme Inhibitors / Q000494:pharmacology*; D005557:Formaldehyde / Q000008:administration & dosage*; D005786:Gene Expression Regulation / Q000187:drug effects; D007150:Immunohistochemistry; D026121:Indole Alkaloids / Q000494:pharmacology*; D007278:Injections, Spinal; D008297:Male; D051381:Rats; D013116:Spinal Cord / Q000187:drug effects* / Q000378:metabolism*; D027981:Symporters / Q000235:genetics / Q000378:metabolism*; D000096922:K Cl- Cotransporters
chemical_list: D002227:Carbazoles; D004791:Enzyme Inhibitors; D005557:Formaldehyde; D026121:Indole Alkaloids; D027981:Symporters; D000096922:K Cl- Cotransporters; C049985:staurosporine aglycone