Understanding the human brain without ever opening it has long been a scientific fantasy. Lacking direct access, researchers have had to rely on often imperfect models to try to observe what is happening inside. But a new path is opening up today: in the laboratory, synthetic brain tissue capable of reproducing several essential functions of the brain now offers a new field of study, more reliable and closer to reality.
A new foundation for neurological research
Reproducing the functioning of a human brain in the laboratory remains one of the most ambitious challenges in biomedical research. Classic platforms, whether two-dimensional cultures or self-organizing organoids, struggle to recreate the complexity of the brain microenvironment. They lack stability, vascularization, or rely on poorly defined materials from living organisms. To overcome these limitations, researchers at the University of California, Riverside, have developed a synthetic scaffold designed entirely to accommodate human neuronal stem cells and promote their development.
Called BIPORES, this support integrates interconnected microscopic pores formed from modified polyethylene glycol. This chemically neutral polymer is sculpted into a network of microchannels with complex curvature, stabilized using silica nanoparticles. The structure thus obtained promotes adhesion, proliferation and differentiation of cells. As highlighted in the study published in Advanced Functional Materials, the neurons obtained develop long and branched extensions, signs of functional maturation rarely achieved on traditional supports.
Better understand diseases thanks to tailor-made fabric
The issue is not limited to cellular performance. One of the most strategic contributions of this synthetic brain tissue is its ability to host cells derived from specific patients. By reprogramming skin or blood cells into stem cells, scientists can create personalized neuronal models, carrying their own mutations or sensitivities. This approach opens up new perspectives for the study of complex neurological disorders such as Alzheimer's disease, strokes or certain degenerative disorders.
Indeed, observations made on tissue cultured on BIPORES reveal better cell viability. In addition, researchers note increased electrical activity, measured using variations in intracellular calcium. This spontaneous activity reflects an ability to form functional circuits, which is confirmed by the team of Iman Noshadi, who led the work. Being able to study these networks in three dimensions makes it possible to explore the progression of pathologies or the response to treatments in a living environment.
Testing without animals, an ethical and scientific breakthrough
The use of animal brains remains the standard in most neurological studies. However, structural and genetic differences with humans limit the validity of the results. The arrival of functional synthetic brain tissue is a game-changer. This model reduces dependence on living organisms while guaranteeing data that is more transposable to human biology. The article published by Science Alert emphasizes that BIPORES supports do not contain any products of animal origin. They also don't use any bio-coating. This composition improves stability and guarantees better reproducibility of results.
Beyond ethical issues, the structure offers good durability. It allows prolonged cultures, essential for studying the long-term effects of certain molecules. Ultimately, researchers want to create interconnected systems. They could combine several types of tissues, such as the liver or kidney. The objective is to observe the systemic effects of a drug. These platforms could lay the foundations for integrated biology. We would no longer look at a single organ, but at a set of interactions, in conditions close to the human body.
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