From Exposure to Inheritance: Persistent Microplastic-Induced Neural and Mitochondrial Dysfunction in Subsequent...

Area of Science:

• Environmental Toxicology
• Developmental Biology
• Neuroscience

Background:

• Microplastic contamination is a growing environmental concern with potential health impacts.
• Polystyrene microplastics are prevalent pollutants, raising questions about their biological effects.
• Intergenerational effects of microplastic exposure require further investigation.

Purpose of the Study:

• To investigate the developmental and intergenerational consequences of polystyrene microplastic exposure in Drosophila melanogaster.
• To assess the impact of microplastics on lifespan, neurobehavior, and molecular pathways.
• To determine if parental exposure affects unexposed offspring.

Main Methods:

• Exposure of Drosophila melanogaster (F0) to varying concentrations of polystyrene microplastics (1.0 μm).
• Evaluation of lifespan, locomotion, exploratory behavior, and stress tolerance in F0 and F1 generations.
• Molecular analysis of F0 and F1 heads for acetylcholine metabolism and mitochondrial dynamics.

Main Results:

• Developmental exposure reduced F0 lifespan and neurobehavior, with microplastic accumulation in heads.
• F0 flies showed disrupted acetylcholine metabolism and altered mitochondrial dynamics, including apoptosis activation.
• Unexposed F1 offspring exhibited reduced lifespan and persistent neurobehavioral deficits, with altered mitochondrial function and elevated AChE activity, despite no detected microplastics.

Conclusions:

• Developmental microplastic exposure induces mitochondrial and cellular stress, leading to neurobehavioral impairments and lifespan reduction.
• Parental exposure to microplastics can cause transgenerational effects, impacting unexposed offspring.
• These findings underscore the critical intergenerational threat posed by microplastic contamination.