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Aryl Hydrocarbon Receptor Signaling Is Functional in Immune Cells of Rainbow Trout ( Oncorhynchus mykiss ).
- Source :
-
International journal of molecular sciences [Int J Mol Sci] 2020 Aug 31; Vol. 21 (17). Date of Electronic Publication: 2020 Aug 31. - Publication Year :
- 2020
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Abstract
- The arylhydrocarbon receptor (AhR) is an important signaling pathway in the immune system of mammals. In addition to its physiological functions, the receptor mediates the immunotoxic actions of a diverse range of environmental contaminants that bind to and activate the AhR, including planar halogenated aromatic hydrocarbons (PHAHs or dioxin-like compounds) and polynuclear aromatic hydrocarbons (PAHs). AhR-binding xenobiotics are immunotoxic not only to mammals but to teleost fish as well. To date, however, it is unknown if the AhR pathway is active in the immune system of fish and thus may act as molecular initiating event in the immunotoxicity of AhR-binding xenobiotics to fish. The present study aims to examine the presence of functional AhR signaling in immune cells of rainbow trout ( Oncorhynchus mykiss ). Focus is given to the toxicologically relevant AhR2 clade. By means of RT-qPCR and in situ hybdridization, we show that immune cells of rainbow trout express ahr 2α and ahr 2β mRNA; this applies for immune cells isolated from the head kidney and from the peripheral blood. Furthermore, we show that in vivo as well as in vitro exposure to the AhR ligand, benzo(a)pyrene (BaP), causes upregulation of the AhR-regulated gene, cytochrome p4501a , in rainbow trout immune cells, and that this induction is inhibited by co-treatment with an AhR antagonist. Taken together, these findings provide evidence that functional AhR signaling exists in the immune cells of the teleost species, rainbow trout.
- Subjects :
- Animals
Cytochrome P-450 CYP1A1 genetics
Fish Proteins genetics
Head Kidney cytology
Head Kidney immunology
Lymphocytes cytology
Lymphocytes immunology
Neutrophils cytology
Neutrophils immunology
Oncorhynchus mykiss growth & development
Oncorhynchus mykiss immunology
Receptors, Aryl Hydrocarbon genetics
Cytochrome P-450 CYP1A1 metabolism
Fish Proteins metabolism
Head Kidney metabolism
Lymphocytes metabolism
Neutrophils metabolism
Oncorhynchus mykiss metabolism
Receptors, Aryl Hydrocarbon metabolism
Subjects
Details
- Language :
- English
- ISSN :
- 1422-0067
- Volume :
- 21
- Issue :
- 17
- Database :
- MEDLINE
- Journal :
- International journal of molecular sciences
- Publication Type :
- Academic Journal
- Accession number :
- 32878328
- Full Text :
- https://doi.org/10.3390/ijms21176323