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Euryhaline crustaceans tolerate exposure to a wide range of dilute media. However, the physiological mechanisms by which these organisms adjust to salinity changes remain largely unexplored at the molecular level. OBJECTIVES: To examine the effect of low salinity on gill Na,K-ATPase activity and epithelial ultrastructure. MATERIAL AND METHODS: Gill epithelial ultrastructure (Antunes et al., J. Exp. Zool. 327: 280, 2017), and Na,K-ATPase activity (Leone et al., J. Membrane Biol. 248: 257, 2015) and immunolocalization (Pinto et al., Aquat. Toxicol. 170: 13, 2017) were examined in C. vittatus either fresh caught from seawater (31 ‰S) or acclimated to 15 ‰S. RESULTS AND DISCUSSION: Only a single ATP binding site (VM=130.8 ± 10.5 nmol min-1 mg protein-1; K0.5=55.3 ± 1.7 μmol.L -1) was disclosed. Na/K-ATPase activity was modulated by Mg2+, Na+, and NH4 +, exhibiting site-site interactions; K+ modulation showed Michaelis-Menten kinetics. K+ plus NH4 +

livro de resumos do x congresso brasileiro sobre crustáceos

KINETIC CHARACTERISTICS, EPITHELIAL ARCHITECTURE AND IMMUNOLOCALIZATION OF GILL (NA+, K+)-ATPASE INDUCED BY LOW SALINITY ACCLIMATION IN THE STRIPED HERMIT CRAB CLIBANARIUS VITTATUS (ANOMURA, DIOGENIDAE)