title: Kidney regeneration through nephron neogenesis in medaka.
abstract: Although renal regeneration is limited to repair of the proximal tubule in mammals, some bony fish are capable of renal regeneration through nephron neogenesis in the event of renal injury. We previously reported that nephron development in the medaka mesonephros is characterized by four histologically distinct stages, generally referred to as condensed mesenchyme, nephrogenic body, relatively small nephron, and the mature nephron. Developing nephrons are positive for wt1 expression during the first three of these stages. In the present study, we examined the regenerative response to renal injury, artificially induced by the administration of sublethal amounts of gentamicin in adult medaka. Similar to previous reports in other animals, the renal tubular epithelium and the glomerulus of the medaka kidney exhibited severe damage after exposure to this agent. However, kidneys showed substantial recovery after gentamicin administration, and a significant number of developing nephrons appeared 14 days after gentamicin administration (P < 0.01). Similarly, the expression of wt1 in developing nephrons also indicated the early stages of nephrogenesis. These findings show that medaka has the ability to regenerate kidney through nephron neogenesis during adulthood and that wt1 is a suitable marker for detecting nephrogenesis.
authors.affiliation: Bioscience and Biotechnology Center, Nagoya University, Chikusa-ku, Nagoya, Japan.
authors.forename: Naoki
authors.initials: N
authors.lastname: Watanabe
authors.forename: Mitsuhiro
authors.initials: M
authors.lastname: Kato
authors.forename: Norihiko
authors.initials: N
authors.lastname: Suzuki
authors.forename: Chikako
authors.initials: C
authors.lastname: Inoue
authors.forename: Svetlana
authors.initials: S
authors.lastname: Fedorova
authors.forename: Hisashi
authors.initials: H
authors.lastname: Hashimoto
authors.forename: Shoichi
authors.initials: S
authors.lastname: Maruyama
authors.forename: Seiichi
authors.initials: S
authors.lastname: Matsuo
authors.forename: Yuko
authors.initials: Y
authors.lastname: Wakamatsu
mesh_terms: D053687:Adult Stem Cells / Q000502:physiology; D000818:Animals; D015415:Biomarkers; D002455:Cell Division; D005839:Gentamicins / Q000633:toxicity; D008297:Male; D008650:Mesonephros / Q000737:chemistry / Q000187:drug effects / Q000502:physiology*; D009399:Nephrons / Q000737:chemistry / Q000502:physiology*; D009990:Oryzias; D012038:Regeneration / Q000502:physiology*; D013045:Species Specificity; D025721:WT1 Proteins / Q000032:analysis
chemical_list: D015415:Biomarkers; D005839:Gentamicins; D025721:WT1 Proteins