Cadmium-Related Effects on Cellular Immunity Comprises Altered Metabolism in Earthworm Coelomocytes

Area of Science:

• Environmental toxicology
• Immunology
• Cellular metabolism

Background:

• Heavy metal cadmium (Cd) pollution poses risks to soil organisms.
• Earthworms rely on innate immunity, specifically coelomocytes, for defense and detoxification.
• Cd exposure is known to modulate immune system function.

Purpose of the Study:

• To investigate the effects of cadmium on earthworm coelomocytes, key components of innate immunity.
• To understand how Cd exposure impacts coelomocyte metabolism and function.
• To identify potential mechanisms linking Cd exposure to immune system impairment.

Main Methods:

• Proteomics analysis to identify changes in protein expression in response to Cd.
• Extracellular flux measurements to assess coelomocyte oxygen consumption and acidification.
• Intracellular calcium level measurements to evaluate coelomocyte activation.

Main Results:

• Cadmium exposure altered immunity-related proteins and energy metabolism gene products in earthworms.
• Significant changes in oxygen consumption rate, extracellular acidification, and metabolic potential of coelomocytes were observed.
• Acute changes in intracellular calcium levels indicated impaired coelomocyte activation, despite unchanged lysosomes and mitochondria.

Conclusions:

• Cadmium exposure significantly impacts earthworm coelomocyte metabolism.
• Altered coelomocyte metabolism and calcium signaling are linked to impaired innate immune function in earthworms exposed to cadmium.
• This research provides insights into the cellular mechanisms underlying heavy metal toxicity in invertebrates.