Anti-Vibrio potential of essential oil components and the role of cinnamaldehyde in Pacific oyster (Magallana gigas) juveniles
In: Aquaculture. Elsevier: Amsterdam; London; New York; Oxford; Tokyo. ISSN 0044-8486; e-ISSN 1873-5622, more
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| Author keywords |
Magallana gigas;Cinnamaldehyde;Vibrio infection;Immune response;Antioxidant;TRP channels;messenger-rna expression;crassostrea-gigas;gene-expression;immune-response;larvae;coralliilyticus;infection;pathogens |
| Authors | | Top |
- Loor, A., more
- Perelli, J.
- Zheng, X.
- Bossier, P., more
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| Abstract |
The increasing resistance of aquatic pathogens to antibiotics demands alternative therapeutic strategies. Plant essential oils (EOs) and their active components offer promising antibacterial and antifungal properties. This study evaluated the growth-inhibitory effects of cinnamaldehyde (CN), citral, limonene, and pinene at four concentrations (0.1 %, 0.01 %, 0.001 %, and 0.0001 %) against Vibrio coralliilyticus, Vibrio splendidus, and Vibrio tubiashii. The tolerance of Magallana gigas juveniles to CN was assessed over a 7-day exposure, and the protective effects of 0.001 % CN against V. coralliilyticus infection were evaluated, including its impact on immune-related gene expression. CN demonstrated strong growth inhibition against all Vibrio species at 0.1 % and 0.01 %, while citral demonstrated efficacy at 0.1 %. Limonene and pinene partially inhibited V. splendidus and V. tubiashii growth at 0.1 %. At 0.001 %, CN partially inhibited V. coralliilyticus growth and was non-toxic to oysters, maintaining 100 % survival. In the challenge assay, oysters treated with 0.001 % CN exhibited significantly higher survival (44 %) compared to the untreated control (3 %). Gene expression analysis revealed that CN upregulated genes associated with immune signaling (MyD88), antioxidant defense (catalase), and ion channel regulation (the transient receptor potentials TRPV4.2, TRPM1.4, and TRPM2.4), supporting its role in enhancing immune and stress responses, while downregulating NF-kappa B, suggesting anti-inflammatory effects. These findings indicate that CN, at non-toxic concentrations, can enhance M. gigas survival against bacterial infection by modulating immune responses. This highlights CN's potential as a natural therapeutic alternative to antibiotics in oyster aquaculture. Further studies should explore synergistic effects with other EOs and assess long-term impacts in production systems. |
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