In recent decades, microplastics and nanoplastics (MNP) have emerged as a global issue with significant impacts on human health.
A recent meta-analysis highlighted the relationship between the concentrations of these particles in body tissues and the onset of various diseases, including some forms of cancer.
This phenomenon is closely linked to the exponential growth of plastic production, which has increased from 1.5 million tons in the 1950s to 390.7 million tons in 2021.
This increase has caused extensive contamination of soil, water, and air, with devastating effects on the environment and living beings.
The invasiveness of microplastics in the human body
Microplastics, derived from the degradation of plastic materials, accumulate in human biological systems.
They have been identified in the respiratory system, digestive system, reproductive organs such as the placenta and testicles, and even in tissues like bone marrow, liver, and gallstones.
The presence of these particles has been associated with severe pathological conditions, including chronic inflammatory diseases and neurodegenerative disorders. Their ability to infiltrate human tissues represents a concrete and growing threat.
Methods of detecting microplastics
Current technologies for detecting MNP use advanced tools such as spectroscopy and pyrolysis-gas chromatography coupled with mass spectrometry.
These methods have documented the presence of microplastics in arteries, veins, lungs, saliva, tonsils, sputum, and other areas of the body.
Their widespread distribution demonstrates the urgency of developing more precise tools to monitor and understand the effects of these particles on the human body.
Exposure pathways and at-risk groups
Inhalation has been identified as the main pathway through which microplastics enter the human body, but the ingestion of contaminated food and water also plays an important role. Children, particularly infants and preschoolers, are more vulnerable due to their still-developing immune systems. Age also emerges as a critical factor in susceptibility, while gender differences in vulnerability are not yet fully understood.
Toxicological effects of microplastics
Microplastics cause severe toxicological effects.
Recent studies show that they can induce oxidative stress, mitochondrial dysfunction, chronic inflammatory responses, and even apoptosis, or programmed cell death.
These phenomena can compromise the functioning of organs and promote the onset of degenerative diseases.
Additionally, some research suggests that MNP can cross the blood-brain barrier, increasing the risk of neurodegenerative diseases.
Correlations between MNP and human diseases
The accumulation of microplastics in body tissues has been associated with various diseases, including arteriosclerosis, thrombosis, inflammatory bowel diseases, and cancerous lesions. The presence of these particles seems to amplify inflammatory and degenerative processes, worsening existing conditions or promoting their development.
The impact of microplastics on health thus constitutes an emergency that requires targeted and timely interventions.
The need for further research
Despite scientific progress, many gaps remain in understanding the link between microplastics and human health.
It is essential to conduct more in-depth studies to analyze the causal relationship between exposure to MNP and the development of diseases, using realistic exposure conditions.
Future research should focus on more precise methodologies and the definition of strategies to mitigate risks. The work, published in TrAC Trends in Analytical Chemistry, represents an important step forward in the fight against microplastic pollution, contributing to the protection of global health.
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