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• W3088416503 endingPage "32" @default.
• W3088416503 startingPage "17" @default.
• W3088416503 abstract "Abstract The elasmoid scales of anadromous sea trout Salmo trutta L. represent a significant internal reservoir of Ca 2+ . Although more is known about long‐term remodelling of scales in response to calciotropic challenges encountered during smoltification and migration, very little is known about the contribution made by scales to the short‐term, minute‐to‐minute regulation of Ca 2+ homeostasis in the extracellular fluid (ECF) during these phases of the life cycle. This gap in the knowledge is partly due to the technical challenges involved in measuring small Ca 2+ fluxes around the scales of live fish in real time. Here, this study describes exfoliating, mounting and culturing scales and their resident cells from parr, smolt and adult sea trout from a freshwater environment, as well as from adult sea trout caught in sea or brackish water. All the scales were then examined using an extracellular, non‐invasive, surface‐scanning Ca 2+ ‐sensitive microelectrode. The authors quantified the Ca 2+ fluxes, in the absence of any systemic or local regulators, into and out of scales on both the episquamal and hyposquamal sides under different extracellular calcemic challenges set to mimic a variety of ECF‐Ca 2+ concentrations. Scales from the life‐cycle stages as well as from adult fish taken from sea, brackish or fresh water all showed a consistent efflux or influx of Ca 2+ under hypo‐ or hypercalcemic conditions, respectively. What were considered to be isocalcemic conditions resulted in minimal flux of Ca 2+ in either direction, or in the case of adult scales, a consistent but small influx. Indeed, adult scales appeared to display the largest flux densities in either direction. These new data extend the current understanding of the role played by fish scales in the short‐term, minute‐to‐minute homeostatic regulation of ECF‐Ca 2+ concentration, and are similar to those recently reported from zebrafish Danio rerio scales. This suggests that this short‐term regulatory response might be a common feature of teleost scales." @default.
• W3088416503 created "2020-10-01" @default.
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• W3088416503 date "2020-10-22" @default.
• W3088416503 modified "2023-10-01" @default.
• W3088416503 title "Short‐term homeostatic regulation of blood/interstitial fluid <scp>Ca²⁺</scp> concentration by the scales of anadromous sea trout <scp><i>Salmo trutta</i> L.</scp> during smoltification and migration" @default.
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