Topical Collection "Fish Immunity: From Genomes to Functional Understanding"
A topical collection in Biology (ISSN 2079-7737).
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Topical Collection Information
Fish immunology is an area of study which is critical for the modern world. Due to the fact that capture fisheries peaked in production 20 years ago, today, more than 50% of the fish consumed worldwide are now produced by aquaculture. In addition, climate change and pollution threaten wild fish populations around the globe. Finally, fish are a diverse group of organisms that have invaded a multitude of niches in both fresh and salt water and thus have developed many unique mechanisms and adaptations that, although based on the same cells and molecules as sharks and tetrapods, produce immune systems that work in unique ways that inform us about the basic principles and evolution of immunity in general.
Fish immunology is at a very intriguing point as a science. Thanks to genomic studies, we now have a framework of knowledge that can inform our experiments into how fish immune systems work, and many labs around the world are developing the cellular and molecular tools that will provide clear answers to the question of how fish immune proteins and cells work. This collection will be home for studies that fit all along that spectrum.
Prof. Dr. Brian Dixon
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- innate immunity
- adaptive immunity
Published Papers (3 papers)
Induction of foxp3 during the Crosstalk between Antigen Presenting Like-Cells MHCII+CD83+ and Splenocytes CD4+IgM− in Rainbow Trout
Cited by 3
| Viewed by 2157
In fish, the spleen is one of the major immune organs in the animal, and the splenocytes could play a key role in the activation and modulation of the immune response, both innate and adaptive. However, the crosstalk between different types of immune
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In fish, the spleen is one of the major immune organs in the animal, and the splenocytes could play a key role in the activation and modulation of the immune response, both innate and adaptive. However, the crosstalk between different types of immune cells in the spleen has been poorly understood. In this work, an in vitro strategy is carried out to obtain and characterize mononuclear splenocytes from rainbow trout, using biomarkers associated with lymphocytes (CD4 and IgM) and antigen-presenting cells (CD83 and MHC II). Using these splenocytes, co-cultures of 24 and 48 h are used to determine the gene expression of master transcriptional factors that coordinate the polarization of T cells (t-bet
, and foxp3
). The results show a proportional upregulation of foxp3
(compared to t-bet
) in co-cultures (at 24 h) of IFNγ-induced splenocytes with and without stimulation of Piscirickettsia salmonis
proteins. In addition, foxp3
upregulation was established in co-cultures with IFNγ-induced cells and in cells only stimulated previously with P. salmonis
proteins at 48 h of co-culture. These results show a potential communication between antigen-presenting-like cells and lymphocyte in the spleen, which could be induced towards a Treg phenotype.
Revisiting the Teleost Thymus: Current Knowledge and Future Perspectives
Cited by 11
| Viewed by 3847
The thymus in vertebrates plays a critical role in producing functionally competent T-lymphocytes. Phylogenetically, the thymus emerges early during evolution in jawed cartilaginous fish, and it is usually a bilateral organ placed subcutaneously at the dorsal commissure of the operculum. In this review,
[...] Read more.
The thymus in vertebrates plays a critical role in producing functionally competent T-lymphocytes. Phylogenetically, the thymus emerges early during evolution in jawed cartilaginous fish, and it is usually a bilateral organ placed subcutaneously at the dorsal commissure of the operculum. In this review, we summarize the current understanding of the thymus localization, histology studies, cell composition, and function in teleost fishes. Furthermore, we consider environmental factors that affect thymus development, such as seasonal changes, photoperiod, water temperature fluctuations and hormones. Further analysis of the thymus cell distribution and function will help us understand how key stages for developing functional T cells occur in fish, and how thymus dynamics can be modulated by external factors like photoperiod. Overall, the information presented here helps identify the knowledge gaps and future steps needed for a better understanding of the immunobiology of fish thymus.
Antimicrobial Peptides of Salmonid Fish: From Form to Function
Cited by 17
| Viewed by 3779
Antimicrobial peptides (AMPs) are small, usually cationic, and amphiphilic molecules that play a crucial role in molecular and cellular host defense against pathogens, tissue damage, and infection. AMPs are present in all metazoans and several have been discovered in teleosts. Some teleosts, such
[...] Read more.
Antimicrobial peptides (AMPs) are small, usually cationic, and amphiphilic molecules that play a crucial role in molecular and cellular host defense against pathogens, tissue damage, and infection. AMPs are present in all metazoans and several have been discovered in teleosts. Some teleosts, such as salmonids, have undergone whole genome duplication events and retained a diverse AMP repertoire. Salmonid AMPs have also been shown to possess diverse and potent antibacterial, antiviral, and antiparasitic activity and are induced by a variety of factors, including dietary components and specific molecules also known as pathogen-associated molecular patterns (PAMPs), which may activate downstream signals to initiate transcription of AMP genes. Moreover, a multitude of cell lines have been established from various salmonid species, making it possible to study host-pathogen interactions in vitro, and several of these cell lines have been shown to express various AMPs. In this review, the structure, function, transcriptional regulation, and immunomodulatory role of salmonid AMPs are highlighted in health and disease. It is important to characterize and understand how salmonid AMPs function as this may lead to a better understanding of host-pathogen interactions with implications for aquaculture and medicine.