Video Spotlight: Harvard's Alice Stanton On Engineering Integrated Human-Derived miBrain Organoid Models

By Ray Dogum, Chief Editor, Drug Discovery Online

Brain organoid models have been getting a lot of attention lately. Their increased sophistication is providing researchers with new tools to better investigate the brain and advance therapies for neurological conditions. Organoids, these self-organizing 3D mini organs, enable powerful high-throughput screening methods for early-stage drug target hit and lead seeking efforts. They can also be used to develop personalized treatments using patients’ own stem cells.

To get up to speed with these powerful models, I visited the Center for Genomic Medicine in Boston where I met with Harvard Medical School Assistant Professor, Alice Stanton, who first engineered the 3D immuno-glial-neurovascular human multicellular integrated brain (miBrain) model.

miBrains (pronounced “my-braynz”) are probably the closest physical in vitro representation of the brain that scientists have been able to invent and, in this interview, we uncover Stanton's journey into science and the tremendous opportunity miBrains hold for translational research and studying neurological disease.

Following Her Curiosity Into Science

Stanton's journey into science stems from an early interest in understanding nature. Stanton described how she, “Loved art, loved nature, and loved figure skating growing up. And little by little I discovered a love for how things work. That interest in nature really took me into wanting to know more. I really enjoyed my science classes in school, and little by little came to see science as a vehicle for making the world better.”

Interest In Studying the Brain

In our video, we covered consciousness, the computational ability of organoids, and other futuristic concepts, but one story Stanton shared moved me most. She told me, “When I was young, my grandmother had a stroke and I saw the impact that had on her. She couldn't express herself the way she wanted to. It was frustrating. It took something from her that was more core to her identity than a missing thumb or other superficial kind of injury. And I just thought, ‘wow, the brain has such a power. It’s so important to us, more than many other organs.’”

Mimicking All Six Brain Cell Types

A miBrain is a new patient-specific, human-based model that integrates all six major CNS cell types—brain microvascular endothelial cells, pericytes, oligodendrocyte precursor cells, neurons, astrocytes, and microglia-like cells—each independently differentiated from iPSCs and assembled into a unified 3D neuro‑immune‑glial‑vascular system.

Co-cultured within a custom-engineered dextran-based Neuromatrix Hydrogel enriched with brain extracellular matrix (ECM) components and the basement membrane peptide mimic material Arginylglycylaspartic acid (RGD), the platform recreates key in vivo hallmarks: neuronal firing and connectivity, blood–brain barrier properties, myelination, multicellular crosstalk, and transcriptomic fidelity.

“Lesser-known cell types like astrocytes and microglia are key players in trophic support for neurons, as well as inflammatory mechanisms. Oligodendroglia, which you could split into oligodendrocytes and their precursor cells, are also very much involved in these regulatory mechanisms,” says Stanton.

And then we include endothelial cells and pericytes, which are two types of vascular cell types that are at the level of the capillaries. This is important because this is where the drug transport actually happens in the brain.

“You have this kind of vascular tree where you have these larger vessels that then narrow into thinner vessels. We have 400 miles of vessels in our brain. And most of these are these little, tiny vessels that are actively providing nutrients, providing support to the tissue, to the whole organ.”

In short: miBrain is a fully integrated, iPSC-derived human brain model—with BBB, neurovascular units, myelinated neuronal networks, and immune components—purpose-built to accelerate mechanistic discovery and patient-specific insights in neurological disease.

Dissecting Alzheimer's Disease Pathology

Unlike traditional organoid systems that rely on co‑emergent cell fate specification, miBrains allow controlled integration of mature, lineage‑defined cell types, enabling mechanistic dissection of cell‑type–specific drivers of disease.

In an Alzheimer’s proof-of-concept, APOE4 miBrains show enhanced amyloid accumulation, tau phosphorylation, and astrocyte reactivity. Crucially, isolating astrocyte-specific APOE4 effects revealed that APOE4 astrocytes alone can trigger oxidative stress and tau pathology via microglial signaling, highlighting a previously obscured axis of glia–neuron dysfunction.

Encouraging Our Future Scientists

Stanton concluded with some positive words for our young scientists out there, “I want to encourage those interested in a path in science, women in STEM, and young people. When you think about how you want to spend your life, making the world better is the way to go. It's certainly not the fast track, but I think we need to help each other to really do what's going to be most meaningful and worth it in the end.”

Stanton also recommended dining at the nearby Harvard Gardens when you’re visiting Boston.