No abstract

Inflammation is one of the main causes of loss of homeostasis at both the systemic and molecular levels. The aim of this study was to investigate in silico the conservation of inflammation-related proteins in the gilthead seabream (Sparus aurata L.). Open reading frames of the selected genes were used as input in the STRING database for protein–protein interaction network analysis, comparing them with other teleost protein sequences. Proteins of the large yellow croaker (Larimichthys crocea L.) presented the highest percentages of identity with the gilthead seabream protein sequence. The gene expression profile of these proteins was then studied in gilthead seabream specimens subcutaneously injected with carrageenin (1%) or phosphate-buffered saline (control) by analyzing skin samples from the injected zone 12 and 24 h after injection. Gene expression analysis indicated that the mechanisms necessary to terminate the inflammatory response to carrageenin and recover skin homeostasis were activated between 12 and 24 h after injection (at the tested dose). The gene analysis performed in this study could contribute to the identification of the main mechanisms of acute inflammatory response and validate the use of carrageenin as an inflammation model to elucidate these mechanisms in fish.

Mitochondria are a crucial cellular organelle that organizes a wide range of biological processes, from energy production and calcium homeostasis to cell proliferation, differentiation, and death as well as inflammation. Mitochondria also support immune cell phenotypes and function. The aim of this communication is to evaluate the mitochondrial status and plasticity of four fish cell lines: SAF-1 (derived from gilthead sea bream skin), DLB-1 (derived from European sea bass brain), FuB-1 (established from mummichog brain), and PLHC-1 (a topminnow hepatocellular carcinoma). A mitochondrial stress assay was performed to compare the bioenergetic capabilities of these four fish cell lines as well as the importance of choosing the correct cell line when performing different in vitro studies.