Understanding the cephalopod immune system based on functional and molecular evidence

Area of Science:

• Marine Biology
• Immunology
• Animal Welfare Science

Background:

• Cephalopods, mollusks with advanced systems, are now under European directives for welfare in research.
• Limited knowledge exists on cephalopod pathogens, pathologies, and immune responses, creating welfare gaps.
• Ecological and economic importance necessitates a deeper understanding of cephalopod health.

Purpose of the Study:

• To review and update current knowledge on the cephalopod immune system.
• To highlight advances in understanding cellular and humoral defense mechanisms.
• To identify knowledge gaps concerning immune-related genes, pathologies, and contaminant impacts.

Main Methods:

• Literature review of published research on cephalopod immunity.
• Analysis of molecular approaches identifying immune-related genes and proteins.
• Examination of studies assessing immune parameters in relation to environmental factors.

Main Results:

• Significant progress in characterizing cephalopod haemocytes and defense factors (cellular and humoral).
• Discovery of numerous immune genes/proteins (e.g., antimicrobial peptides, Toll-like receptors) in haemocytes, gills, and digestive glands.
• Emerging data suggests pollutants negatively impact cephalopod immune responses, particularly in Octopus vulgaris.

Conclusions:

• Cephalopod immunity is complex, involving sophisticated innate defense mechanisms.
• Further research is crucial to elucidate the precise roles of identified immune components and contaminant effects.
• Understanding cephalopod immunity is vital for improving welfare standards and addressing ecological/economic concerns.