Pentachlorophenol reduces B lymphocyte function through proinflammatory cytokines in Carassius auratus

Area of Science:

• Immunology
• Environmental Toxicology
• Aquatic Biology

Background:

• Cytokines and Immunoglobulin M (IgM) are critical for fish acquired immunity.
• Pentachlorophenol (PCP) is an environmental pollutant with potential immunotoxic effects.
• Understanding PCP's impact on fish immune parameters is crucial for aquatic ecosystem health.

Purpose of the Study:

• To investigate the effects of pentachlorophenol (PCP) on proinflammatory cytokine mRNA expression (TNF-alpha and IL-1beta) in crucian carp.
• To assess PCP's immunotoxicity on B cell function, specifically IgM secretion, using fish macrophages.
• To elucidate the mechanisms by which PCP may affect the fish immune microenvironment.

Main Methods:

• Semi-quantitative reverse transcriptase-polymerase chain reaction (RT-PCR) was used to measure cytokine mRNA levels.
• Enzyme-linked immunosorbent assay (ELISA) determined IgM secretion by B cells exposed to PCP-treated macrophages.
• Enzyme-linked immunospot (ELISPOT) assessed the ability of B cells to secrete IgM.

Main Results:

• PCP administration significantly suppressed the mRNA expression of tumor necrosis factor-alpha (TNF-alpha) and interleukin-1beta (IL-1beta).
• Supernatants from PCP-exposed fish macrophages exhibited reduced stimulation of B cells.
• PCP exposure led to lower B cell maturation and decreased IgM secretion.

Conclusions:

• Pentachlorophenol (PCP) negatively impacts crucial immune mediators in fish, specifically proinflammatory cytokines.
• PCP exposure impairs B cell maturation and function, leading to reduced IgM production.
• These findings suggest PCP can disrupt the immune microenvironment, potentially compromising fish acquired immunity.