Copper pyrithione exposure-induced copper accumulation compromises mouse oocyte maturation

Area of Science:

• Environmental toxicology
• Reproductive biology
• Cellular biology

Background:

• Copper pyrithione (CPT) is a widely used biocide, raising concerns about copper accumulation and toxicity.
• Copper exposure is known to negatively impact reproductive systems, but effects on oocyte maturation at environmental concentrations are unclear.

Purpose of the Study:

• To investigate the adverse effects of environmentally relevant copper pyrithione (CPT) concentrations on oocyte maturation and quality.
• To explore the underlying mechanisms of CPT-induced oocyte damage.
• To evaluate the potential protective effects of Ammonium Tetramolybdate (TTM).

Main Methods:

• Exposure of oocytes to environmental concentrations of CPT.
• Measurement of intracellular copper levels.
• Assessment of organelle function, reactive oxygen species (ROS) levels, and apoptosis.
• Analysis of cytoskeletal dynamics (α-tubulin acetylation, actin filaments, spindle apparatus).
• Evaluation of epigenetic modifications.
• Treatment with TTM to assess amelioration.

Main Results:

• CPT exposure significantly increased copper levels within oocytes.
• CPT disrupted oocyte maturation by impairing organelle function, increasing ROS, and inducing apoptosis.
• CPT altered cytoskeletal dynamics, leading to aberrant spindle formation and maturation failure.
• Epigenetic modifications in oocytes were affected by CPT exposure.
• TTM supplementation effectively improved oocyte quality and maturation in CPT-exposed oocytes by chelating copper.

Conclusions:

• Environmental concentrations of CPT adversely affect oocyte maturation and quality through copper accumulation.
• CPT-induced damage involves organelle dysfunction, oxidative stress, apoptosis, cytoskeletal disruption, and epigenetic alterations.
• TTM shows potential as a therapeutic agent to counteract CPT's detrimental effects on oocytes.