Oxidative Chemical Stressors Alter the Physiological State of the Nasal Olfactory Mucosa of Atlantic Salmon

Antioxidants
Carlo C LazadoAleksei Krasnov

Abstract

The olfactory organs of fish have vital functions for chemosensory and defence. Though there have been some ground-breaking discoveries of their involvement in immunity against pathogens in recent years, little is known about how they respond to non-infectious agents, such as exogenous oxidants, which fish encounter regularly. To this end, we employed Atlantic salmon (Salmo salar) as a model to study the molecular responses at the nasal olfactory mucosa of a teleost fish when challenged with oxidants. Microarray analysis was employed to unravel the transcriptional changes at the nasal olfactory mucosa following two types of in vivo exposure to peracetic acid (PAA), a highly potent oxidative agent commonly used in aquaculture: Trial 1: periodic and low dose (1 ppm, every 3 days over 45 days) to simulate a routine disinfection; and Trial 2: less frequent and high dose (10 ppm for 30 min, every 15 days, 3 times) to mimic a bath treatment. Furthermore, leukocytes from the olfactory organ were isolated and exposed to PAA, as well as to hydrogen peroxide (H2O2) and acetic acid (AA)-the two other components of PAA trade products-to perform targeted cellular and molecular response profiling. In the first trial, microarrays identified 3...Continue Reading

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Citations

Apr 4, 2021·Antioxidants·Silvia Dossena, Angela Marino

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Methods Mentioned

BETA
mechanical dissociation
mechanical dissociations
Assay
PCR

Software Mentioned

STARS
Nofima
SigmaPlot

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