Don't Call it a Brain in a Dish!

Key takeaways

Brain organoids represent a groundbreaking approach to studying human brain development and disorders, overcoming the limitations of traditional research models.
Current psychiatric disorder understanding is limited compared to other medical fields due to the lack of reliable biomarkers and access to living human brain tissues.
The development of brain organoids involves advanced biological techniques that allow researchers to create living brain-like tissues for analysis.
Understanding the balance between excitatory and inhibitory neurons is crucial for understanding various neurological and psychiatric disorders.
While the potential applications of brain organoids are vast, ethical considerations about their use, especially in live animal models, remain a significant concern.

Summary

Introduction to Brain Organoids

In this episode, hosts Hannah and Vijay Pandey engage with Sergio Pashka, a Professor of Behavioral Science at Stanford, to demystify the concept of brain organoids. Brain organoids represent a technological revolution allowing researchers to study human brain development and disorders using living brain cells cultivated in a laboratory setting. The conversation underscores the limitations of traditional methods such as genetic studies, primate models, and post-mortem analysis, which have hindered our understanding of psychiatric disorders.

Challenges in Current Understanding of Brain Disorders

Pashka elaborates on the stagnation in the understanding of psychiatric disorders compared to advancements in oncology. The discussion emphasizes the lack of reliable biomarkers for psychiatric conditions and critiques the existing models for understanding behavioral aspects without a solid molecular foundation. The need for direct access to living brain tissues is highlighted, which brain organoids aim to address.

Mechanics of Brain Organoid Development

The hosts and Pashka delve into the technical details of developing brain organoids, including the use of pluripotent stem cells derived from patients. An exciting part of this segment is the discussion about the potential to push these cells backward in development, effectively allowing a 'time travel' to create brain-like tissues in a controlled environment. The process involves maintaining these cells in a three-dimensional culture that mimics natural brain development.

The Science Behind Behavior and Brain Function

A significant part of the conversation focuses on the importance of understanding the balance between excitatory and inhibitory neural circuits in the brain. Pashka explains how disruptions in this equilibrium can lead to disorders such as epilepsy and autism. Such insights deriving from brain organoid research could lead to better-targeted therapies as our knowledge about these conditions evolves.

The Future of Brain Organoid Research

As the discussion shifts towards the future applications of brain organoids, the potential for developing complex neural circuitry models is considered. Pashka mentions the possibility of transplanting these organoids into animals for experimental purposes, which raises ethical questions. The overall optimism surrounding probing deeper into human brain functions and potentially understanding consciousness is palpable.

Ethical Concerns in Brain Organoid Research

The episode concludes with reflections on the ethical considerations tied to the emerging technologies in neural research. The hosts discuss the importance of a clear distinction between organoids and actual brain functions, noting crucial elements like sensory experience that organoids do not replicate. The conversations urge caution with regard to the capabilities of these brain models and how they could impact ethical standards in neuroscience.

Show notes

Our understanding of the human brain and its disorders has always been limited by our lack of access to living, human, developing brain tissue. For the first time, that's changing. In this episode, Sergiu Pasca, Professor of Behavioral Science at Stanford, talks with a16'z General Partner Vijay Pande and Hanne Tidnam about the wild new tech that's pioneering a whole new approach to understanding the brain: brain organoids.

So what are brain organoids, what are the scientific breakthroughs that lead to their creation, and how can we use them best? The conversation starts with the existing models we have used to learn about the living brain, from genetic studies to autopsies to primates—and what this new model now brings us: the ability to study the human brain, both how it develops and what goes wrong in certain disorders, with human brain tissue "alive" in a dish. We talk about what these organoids can and can’t do; what they’re good for understanding and where that understanding becomes limited; why calling these “brains in a dish” or “mini-brains” isn’t the right terminology at all; and finally, how far can this new tool and model be taken now and in the future, leading us closer towards understanding psychology itself on a molecular level.

Image: Brain organoids derived in the Pasca Lab at Stanford University.

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