The phagocytes of fish play an important role in innate host defense against bacterial infection, and participate in various immunoregulatory processes. Here, we investigated the effects of various opsonins in the ingestion and adhesion processes by examining respiratory burst (RB) activity in blood and head kidney (HK) fish phagocytes. RB activity was induced in rainbow trout phagocytes with the bacterium Aeromonas salmonicida (strain MT004) in the presence of various opsonins [purified antibodies (Ab), immune serum (IS), normal serum (NS) and heat-inactivated immune serum (HI-IS)], and measured in terms of luminol-amplified chemiluminescence (CL) emission at 20 degrees C for 210 min. The RB activity of blood phagocytes was measured directly from highly diluted whole blood and compared to that observed in isolated head kidney (HK) phagocytes measured under similar conditions. In addition, the extracellular RB activity of adhesion (extracellular degranulation) and the intracellular RB activity of ingestion were distinguished through their inhibition by gelatin and cytochalasin D. Our results showed that the first CL peak appeared within 50 min, and decreased or vanished when gelatin was added to the reaction or when the active complement was destroyed by heating. The second CL peak appeared after 50 min, depending on the utilized opsonin, and vanished when cytochalasin D was added to the reaction. Our results indicate that adhesion and ingestion compete for consumption of reactive oxygen intermediates. Specific IgM without an active complement was a relatively inefficient opsonin, whereas specific IgM with an active complement increased the magnitude of ingestion-mediated RB activity and accelerated the ingestion of target bacteria. Taken together, these results indicate that adhesion and ingestion responses competed for limited phagocyte resources and that the bacterial uptake by blood phagocytes can be measured directly from highly diluted blood.
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http://dx.doi.org/10.1016/j.dci.2004.10.006 | DOI Listing |
Environ Res
January 2025
College of Chemistry, Liaoning University, Shenyang, 110036, PR China; Liaoning Key Laboratory of Chemical Additive Synthesis and Separation, Yingkou Institute of Technology, Yingkou, 115014, PR China. Electronic address:
Basic dyes are highly toxic and have adverse effects on humans such as accelerated heart rate, shock, cyanosis, and tissue necrosis upon ingestion or skin contact. Efficient removal of basic dye pollutants from wastewater is therefore essential for the protection of the environment and human health. Biomolecules exhibit excellent dye removal performance in terms of removal capacity, selectivity, and rate.
View Article and Find Full Text PDFPoult Sci
January 2025
Prestage Department of Poultry Science, College of Agriculture and Life Sciences, North Carolina State University, Raleigh, NC 27695-7608. Electronic address:
Campylobacter infections are a prevalent cause of diarrheal disease in humans and are the most significant zoonotic pathogens worldwide. Human campylobacteriosis is generally via ingestion of contaminated poultry products. However, based on recent studies chicken egg yolk antibody (IgY) powder has great potential to reduce the cecum load of Campylobacter jejuni (C.
View Article and Find Full Text PDFFront Med (Lausanne)
December 2024
Department of General Surgery, The Second People's Hospital of Hefei, Hefei Hospital Affiliated to Anhui Medical University, Hefei, China.
Background: Special attention should be given to intra-abdominal adhesions in patients with a history of open cholecystectomy for gallstones or abdominal surgery. Choosing the appropriate surgical approach to remove the stones is crucial.
Patient Summary: A 68-year-old male was admitted due to sudden onset of upper abdominal pain lasting more than 6 h.
Int J Womens Health
December 2024
Department of Obstetrics and Gynecology, Changning Maternity and Infant Health Hospital, East China Normal University, Shanghai, 200050, People's Republic of China.
Background: Female pelvic peritoneal adhesions (FPPA) represent a significant global health burden. Dietary habits play a crucial role in health outcomes, yet their influence on FPPA remains unclear. This study aims to explore the bidirectional causal relationships between 72 eating habits and FPPA using sex-stratified Mendelian randomization (MR).
View Article and Find Full Text PDFHeliyon
December 2024
Department of Earth and Environmental Sciences, DISAT, University of Milano-Bicocca, Piazza Della Scienza 1, 20126, Milan, Italy.
The aim of this study was to evaluate the effects of chronic exposure (21 days) to an environmentally relevant concentration (10 μg/L) of two different nanoplastic (NP) polymers on the aquatic model organism . This study examined the impact of exposure to 200 nm polystyrene nanoplastics (PS-NPs) and polyvinyl chloride nanoplastics (PVC-NPs), which had an average size similar to that of PS-NPs (ranging from 50 nm to 350 nm). The effects of polymer exposure on morphometric parameters, number of molts, swimming behaviour, and reproductive outcomes were evaluated.
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