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Tissue Clearing To Localize Microplastics via Three-Dimensional Imaging of Whole Organisms
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Researchers developed a tissue-clearing technique that renders whole organisms transparent after microplastic ingestion, allowing 3D fluorescence imaging to precisely locate unlabeled environmental microplastics inside an organism without destroying tissue. Unlike conventional digestion methods that lose spatial information, this approach preserves the organism's structure while a fluorescent dye selectively stains the plastics. This tool could substantially improve our understanding of where microplastics accumulate within living organisms and what tissues they affect.
Understanding the biological impacts of plastic pollution requires an effective methodology to detect unlabeled microplastics in environmental samples. Detecting unlabeled microplastics in an organism generally requires a digestion protocol, which results in the loss of spatial information on the distribution of microplastic within the organism and could lead to the disappearance of the smaller plastics. Fluorescence microscopy allows visualization of ingested microplastics but many labeling strategies are nonspecific and label biomass, thus limiting our ability to distinguish internalized plastics. While prelabeled plastics can be used to avoid nonspecific labeling, this approach precludes the detection of environmental microplastics in organisms. Also, using prelabeled microplastics can affect the viability of the organism and impact plastic uptake. Thus, a method was developed that employs nonspecific labeling with a tissue-clearing technique. Briefly, unlabeled microplastics are stained with a fluorescent dye after ingestion by the organism. The tissue-clearing technique then removes tissue-bound dye while rendering the structurally intact organism transparent. The internalized plastics remain stained and can be visualized in the cleared tissue with fluorescence microscopy. The technique is demonstrated using polystyrene beads in living aquatic organismsTigriopus californicusandDaphnia magnaand by spiking a model vertebrate (Cephalochordata) with different microplastics.
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Using Tissue clearing for the analysis of ingested microplastic particles
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Researchers adapted the CUBIC tissue clearing protocol to render normally opaque aquatic and terrestrial organisms transparent, enabling three-dimensional visualization of fluorescently labeled microplastic particles within intact digestive systems. The method successfully achieved transparency across organisms from different functional feeding groups, offering improved spatial resolution for studying MP accumulation sites without destructive dissection.
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Researchers adapted the CUBIC tissue-clearing protocol to enable non-invasive visualization of labeled microplastic particles ingested by aquatic and terrestrial organisms of different functional feeding guilds, rendering organisms transparent to allow internal detection without chemical digestion. The proof-of-principle study demonstrated that fluorescently labeled microplastics could be localized within digestive tracts while preserving sample integrity.
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Researchers tested a new approach using X-ray micro-computed tomography (microCT) to detect and map microplastics inside zebrafish in three dimensions. The non-destructive imaging technique successfully identified polyethylene particles throughout the gut and revealed how their distribution changed over time. This method offers a promising alternative to traditional destructive techniques for studying how microplastics move through living organisms.
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Scientists used a special 3D scanning technique (like a CT scan for fish) to watch, in real time, how tiny plastic particles move through a zebrafish's gut after being eaten—without having to cut the fish open. They found the microplastics travel toward the back of the intestine before being eliminated, and this new tracking method could help researchers better understand where plastics linger in the body and what harm they might cause. While this study was done in fish, it offers a promising tool for future research into how ingested microplastics behave inside living creatures, including potentially humans.
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