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Human Brain Organoids Integrated Into Mouse Brains, Enabling Disease Research
Scientists grew tiny pieces of human brain tissue in a laboratory.
They placed these tissues, called organoids, into specially prepared mouse brains.
The organoids survived and grew inside the mice.
They developed many kinds of human brain cells and connected into circuits.
The mice with the organoids performed differently on some movement and memory tests.
This may help scientists learn more about how the human brain develops.
It could also help researchers study conditions such as ADHD and autism.
However, the organoids are not the same as a fully developed human brain.
Their effects may come from the way human and mouse brain parts worked together.
Researchers transplanted human stem-cell-derived cortical organoids into mice with depleted cortex regions.
The organoids survived, grew, developed diverse human brain cells, and formed neural circuits resembling cortical tissue.
Mice receiving organoids differed from cortex-depleted mice without grafts on motor and memory tasks.
Researchers said the model could help study human brain development and disorders including ADHD and autism.
An expert cautioned that integration does not mean the grafted tissue functions like mature human brain tissue.
- Who
- Researchers from Stanford University conducted the study; Adeel Razi of Monash University commented independently.
- What
- Human stem-cell-derived cortical brain organoids were transplanted into mice and integrated with remaining mouse brain circuitry.
- Where
- The experiments were conducted by researchers from Stanford University in the United States.
- When
- The study was published in the journal Nature; the articles do not specify a publication date.
- Why
- To create a model for studying human brain development, neurological disorders, and potential treatments.
Research Potential
Scientific Limitations
Studying human brain development
Research Potential
The researchers said the transplantation platform provides a way to examine how human neurons function and may offer more detailed insight into human brain development.
Scientific Limitations
Adeel Razi said the grafted tissue lacks features of mature human brain tissue, so its behavior cannot be treated as equivalent to that of a mature human brain.
Explaining mouse behavior
Research Potential
The researchers reported that mice with organoids differed from mice without them on motor and memory tasks, suggesting the integrated tissue may influence behavior.
Scientific Limitations
Razi said the recorded behavior results from interactions between the human cortex and remaining mouse subcortical circuitry, making it difficult to determine whether the human cells caused or were necessary for a particular behavior.
Disease research
Research Potential
Razi described the system as particularly useful for studying developmental injury and neurodevelopmental diseases such as ADHD and autism.
Scientific Limitations
Razi cautioned that functional integration alone does not demonstrate functional equivalence, limiting how directly findings can be applied to human disease.
Key facts
- Research institution
- Stanford University
- Publication
- Nature
- Transplanted tissue
- Human stem-cell-derived cortical organoids
- Host animals
- Mice with depleted cortex regions
- Observed development
- Diverse human brain cells, neural circuits, and cortical-like structures
- Behavioral effects
- Differences in motor and memory tasks
- Potential applications
- Research on brain development, ADHD, autism, developmental injury, and treatments
Quotes
Adeel Razi
Professor of computational neuroscience at Monash University who was not involved in the study
“The proposed system creates an unusual experimental platform for studying biological intelligence. It will help disentangle what properties of human cortical organisation are intrinsic to the human brain from what is imposed by the developmental phase and surrounding mouse host brain circuitry.”
rediff.com
“The functional integration of human-derived brain cells is not a proxy for its functional equivalence. The grafted human brain tissue lacks features of mature human brain tissue.”
rediff.com
Sources
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