For years, we have understood that microplastics are ubiquitous, infiltrating our oceans, the air we breathe, and even our own blood and organs. However, a persistent challenge has hampered our full understanding of the health risks: we couldn't see exactly how these particles move and accumulate inside a living body in real-time.Â
A groundbreaking study, led by researchers at University College London (UCL) and published in Advanced Science, has changed that narrative by successfully mapping microplastics deep within the living tissue of mice for the first time.
The innovation: photoacoustic imaging
Previously, detecting microplastics inside organisms required invasive procedures like dissection or chemical labeling, which could alter how the particles behave. This new approach leverages a non-invasive technique called photoacoustic imaging.
The process works by:
- Laser pulses: Directing pulses of lasers into the tissue.
- Unique fingerprinting: Microplastics absorb this light according to their unique absorption fingerprint.
- Sound waves: This absorption generates tiny, high-frequency sound waves.
- Detailed mapping: Ultrasound detectors pick up these waves to create a high-resolution map of the particles' exact locations.
This method is sensitive enough to detect individual microplastics as small as a human hair and can track them over months, providing a much more realistic view of long-term exposure than previous methods.
Understanding real-life impacts
This advancement is a critical step toward linking everyday microplastic exposure with chronic health effects. While we know humans may inhale or ingest an amount of plastic equivalent to a credit card each week, the long-term biological consequences - such as inflammation, oxidative stress, or cellular damage - remain a subject of intense study.
Key findings from related research highlight the urgency:
- Researchers have found microplastics lodged deep in the lower regions of living human lungs, areas previously thought too small for such particles to reach.
- Particles have been identified in human colon tissue, conspicuously frequent in areas with inflammatory changes.
- Common plastics like polypropylene and PET are among the most frequently detected.
The ability to finally "see" the invisible path of microplastics is a powerful call to action to choose materials that leave no trace.
Sources
- UCL News. Microplastics mapped in living tissue for the first time.
- The Guardian. Microplastics found deep in lungs of living people for first time.
- ScienceDaily. Scientists make microplastics glow to see what they do inside your body.
- Digital Journal. Microplastics found deep in the lungs of living humans for the first time.
- The Microbiologist. Plastic particles can increase intestinal inflammation.
- Advanced Science. Microplastics mapped in living tissue for the first time.
