Using Stem Cells to Cure Autism, Epilepsy & Schizophrenia | Dr. Sergiu Pașca
Huberman Lab Podcast Recap
Published:
Duration: 2 hr 23 min
Guests: Dr. Sergiu Pașca
Summary
Dr. Sergiu Pașca discusses the potential of stem cells in treating neurodevelopmental disorders like autism, epilepsy, and schizophrenia. He highlights the challenges and ethical considerations involved in stem cell research, along with advancements in technology like organoids and assembloids.
What Happened
Dr. Sergiu Pașca, a professor of psychiatry and behavioral sciences at Stanford, opens the discussion by addressing the rising prevalence of autism, now affecting close to 3% of the population. He debunks outdated theories like the 'refrigerator mother' hypothesis and confirms the strong genetic component in autism, particularly its higher prevalence in males.
Pașca elaborates on the complexity of autism, describing it as a spectrum disorder with no specific biomarker and a variety of causes. He notes that while about 20% of autism cases have a known genetic cause, the rest are idiopathic. Despite anecdotal claims, there is no solid evidence linking vaccines or microbiome deficits to autism.
The conversation shifts to the challenges of treating brain disorders due to the organ's inaccessibility. Pașca highlights CRISPR technology's potential for correcting genetic defects, though delivery, especially to the brain, remains a significant hurdle. He explains that adenoviruses can be engineered to deliver genes without causing illness, yet challenges like gene size and immune reactions persist.
Stem cells are presented as a promising avenue for research, with Pașca explaining their ability to become other cells and maintain indefinitely. He discusses the ethical concerns associated with embryonic stem cells, noting Shinya Yamanaka's groundbreaking work in reprogramming adult cells into pluripotent stem cells, bypassing the need for embryonic sources.
Organoids and assembloids are introduced as innovative tools for studying brain development and disorders. Pașca explains how organoids can mimic aspects of human brain development and how assembloids allow for the study of cell migration and circuit formation. These models offer insights into diseases like Timothy syndrome and 22q11.2 deletion syndrome, which are linked to autism and schizophrenia.
Ethical considerations in stem cell research are thoroughly examined, particularly the risks of injecting stem cells into the brain and the potential for tumor growth. Pașca warns against unregulated stem cell injections, which often lack understanding of what cells are being used. He emphasizes the need for systematic clinical trials to ensure safety and efficacy.
The episode concludes with Pașca's insights into the future of regenerative therapies, including the potential for banking one's own cells and using off-the-shelf cells. While the field holds promise, concerns about aging cells and mutations remain, along with ethical considerations in transplanting human neurons into animals or other humans.
Key Insights
- Autism affects close to 3% of the population and is more prevalent in males, with a 4:1 male-to-female ratio. It is a spectrum disorder with no specific biomarker and varying causes, including genetic factors.
- CRISPR technology offers the potential to correct genetic defects at the DNA level, though challenges like delivery to the brain and immune reactions remain significant hurdles.
- Organoids and assembloids provide valuable models for studying brain development and disorders. They can mimic aspects of human brain development and allow for the study of diseases like epilepsy and schizophrenia.
- Ethical concerns in stem cell research include the risk of tumor growth from brain injections and the use of embryonic stem cells. The discovery of Yamanaka factors allows for the reprogramming of adult cells, bypassing these ethical issues.