The cellular clumps that hold the secrets to neurodegeneration and biotechnology
In short: Often dismissed as mere cellular waste, inclusion bodies are dense, protein-rich aggregates found in everything from bacteria to human neurons. While they are hallmarks of devastating diseases like Parkinson's, these microscopic structures are also being reimagined as innovative biomaterials for controlling disease in livestock and aquaculture.
In many neurodegenerative conditions, inclusion bodies serve as visible markers of cellular distress. In the brain, these aggregates can accumulate within the nucleus or cytoplasm of neurons. Specific examples include Lewy bodies in Lewy body dementias, Bunina bodies in motor neurons associated with amyotrophic lateral sclerosis, and Pick bodies found in frontotemporal dementia. Other notable forms include Collins bodies in familial encephalopathy and Papp–Lantos bodies in multiple system atrophy.
Beyond the nervous system, these structures appear in various biological contexts. In red blood cells, specific inclusions like Howell-Jolly bodies (nuclear fragments) or Heinz bodies (refractile inclusions) can indicate blood disorders. In bacteria like Escherichia coli, inclusion bodies often form when recombinant proteins are overexpressed. This frequently happens when genes from one organism are expressed in another, such as placing eukaryotic cDNA into a prokaryote, where differences in pH, osmability, or a lack of specific processing machinery cause proteins to precipitate.
While traditionally viewed as collections of misfolded, inactive proteins, the nature of these bodies is more nuanced. Researchers have found that some proteins, such as green fluorescent protein, can retain their native, functional structure even within an aggregate. In biotechnology, the challenge lies in managing them; between 70% and 80% of recombinant proteins in E. coli end up in these aggregates. While difficult to process, scientists can use denaturants like urea to solubilize them, followed by complex refolding protocols to recover active, functional proteins for therapeutic use.
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Sources
- Summary by Intellect · source: Inclusion bodies
- Also: Potential of inclusion bodies for disease control in aquaculture and livestock.
- Also: International journal of molecular sciences — Refolding Protocol of the Cysteine-Rich Domain of Frizzled8 from Inclusion Bodies. · CC BY
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