An attenuated live strain of HY9901 mutant Δgr provides protection against Vibrio alginolyticus in pearl gentian grouper (♀Epinephelus fuscoguttatus × ♂Epinephelus lanceolatu)

IF 1.4 3区农林科学 Q4 IMMUNOLOGY Veterinary immunology and immunopathology Pub Date : 2025-02-01 DOI:10.1016/j.vetimm.2025.110887

Mei Tang, Jianru Feng, Xudong Wang, Yu Ding

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Abstract

Vibrio alginolyticus is a serious aquaculture bacterial pathogen, which is widely distributed in the ocean and rivers, and cause vibriosis in aquaculture. Therefore, it is imperative to develop effective vaccine to prevent vibriosis. In this study, the efficacy of gr deletion strain (Δgr) of V. alginolyticus as an attenuated live vaccine was evaluated in peal gentian grouper by intraperitoneal injection immunization, followed by a wild strain injection challenge. Real-time fluorescence quantitative PCR was used for analyzing the expression dynamics of immune-related genes. ELISA was used to assess the serum antibody titer and non-specific enzyme activities were determined by kit. The results showed that the safe dose of Δgr was 1.0 × 10⁶ CFU/mL for pearl gentian grouper, and the immune protection rate of Δgr was 73.08 %, providing significant protection against V. alginolyticus. The expression levels of all the immune-related genes MHC-Iα, TNF-α, IL-1β, IL-16 and MyD88 were upregulated in liver, spleen, head kidney and thymus within 42 days post-vaccination. In addition, specific antibody IgM, activities of catalase, superoxide dismutase and lysozyme were also significantly increased compared with the control group. It is not only safe for groupers, but also can effectively stimulate both specific and non-specific immunity of fish. These results indicated that Δgr could be used as an effective attenuated live vaccine candidate to prevent pearl gentian grouper against V. alginolyticus in aquaculture.

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来源期刊

Veterinary immunology and immunopathology 农林科学-免疫学

CiteScore

3.40

自引率

5.60%

发文量

审稿时长

70 days

期刊介绍： The journal reports basic, comparative and clinical immunology as they pertain to the animal species designated here: livestock, poultry, and fish species that are major food animals and companion animals such as cats, dogs, horses and camels, and wildlife species that act as reservoirs for food, companion or human infectious diseases, or as models for human disease. Rodent models of infectious diseases that are of importance in the animal species indicated above,when the disease requires a level of containment that is not readily available for larger animal experimentation (ABSL3), will be considered. Papers on rabbits, lizards, guinea pigs, badgers, armadillos, elephants, antelope, and buffalo will be reviewed if the research advances our fundamental understanding of immunology, or if they act as a reservoir of infectious disease for the primary animal species designated above, or for humans. Manuscripts employing other species will be reviewed if justified as fitting into the categories above. The following topics are appropriate: biology of cells and mechanisms of the immune system, immunochemistry, immunodeficiencies, immunodiagnosis, immunogenetics, immunopathology, immunology of infectious disease and tumors, immunoprophylaxis including vaccine development and delivery, immunological aspects of pregnancy including passive immunity, autoimmuity, neuroimmunology, and transplanatation immunology. Manuscripts that describe new genes and development of tools such as monoclonal antibodies are also of interest when part of a larger biological study. Studies employing extracts or constituents (plant extracts, feed additives or microbiome) must be sufficiently defined to be reproduced in other laboratories and also provide evidence for possible mechanisms and not simply show an effect on the immune system.