Photo Credit: Navya Mishra.
Scientific Frontline: Extended "At a Glance" Summary: CAMEO Sensor Technology for Cerebral Organoids
The Core Concept: CAMEO (Conformal Array for Monitoring Electrophysiology of Organoids) is a low-cost, scalable sensor platform designed to monitor electrical activity within human cerebral organoids.
Key Distinction/Mechanism: Unlike traditional, expensive microelectrode arrays that rely on costly materials, CAMEO utilizes 12 flexible carbon nanotube strands arranged in a basket-like structure. This design suspends the organoid and detects low-amplitude electrophysiological signals without the need for specialized workflows or expensive gold electrodes.
Major Frameworks/Components:
- Human Cerebral Organoids: Millimeter-sized tissues cultured from stem cells that replicate the complexity and specific cell types of human brain regions.
- Carbon Nanotube Microelectrode Arrays (MEAs): Highly sensitive, flexible 3D electrodes capable of recording extracellular electrophysiological activity.
- High-Throughput Processing: A scalable diagnostic approach that allows for simultaneous, multi-sample data collection in standard cell culture plates.
Branch of Science: Neurodevelopmental Biology, Electrical Engineering, Chemical and Biomolecular Engineering, and Biosensing.
Future Application: The platform is designed to facilitate large-scale studies of neurodevelopment and genetic conditions, specifically targeting disorders like Angelman syndrome. It also establishes a standardized, "plug-and-play" data-collection format to streamline drug screening and data sharing across global research laboratories.
Why It Matters: Previous sensor technologies were prohibitively expensive, forcing researchers to use fewer than 10 organoids per study and limiting the reliability of results. By drastically lowering manufacturing costs and proving effective across 74 organoids in proof-of-concept testing, CAMEO increases the statistical power, scalability, and biological relevance of neurological research.
Researchers have demonstrated a new class of low-cost, scalable sensors that can be used to monitor electrical activity in human cerebral organoids. Because electrical signals are key to understanding brain function, this advance facilitates research into both neurodevelopment and genetic disorders such as Angelman syndrome.
Human cerebral organoids are millimeter-sized tissues comprised of cell types typically found in the different regions of the brain. They are made by culturing stem cells. These organoids are important to many fields of research because they allow researchers to study the behavior of nervous system cells and tissues in ways that are not possible with animal models.
For example, Angelman syndrome is a genetic disorder associated with delayed development, intellectual disability, speech impairment and problems with movement. Because researchers cannot conduct research on a human’s developing brain, human cerebral organoids are a valuable platform for understanding the genetic activity that causes the disorder and developing therapeutic treatments.
“Animal models don’t really capture the complexity of the human brain, which is one reason why human cerebral organoids are attractive for brain research,” says Amay Bandodkar, co-corresponding author of a paper on the work and an assistant professor of electrical and computer engineering at North Carolina State University.
“One challenge with human cerebral organoid research is that there can be significant variation across organoid samples,” says Navya Mishra, first author of the paper and a Ph.D. student at NC State. “As a result, it’s important to have a lot of samples in order to produce biologically meaningful results.
“However, the sensors currently used in organoid research are expensive, due to both the materials they are made from and the manufacturing process itself,” says Mishra. “This creates financial constraints that result in researchers often using fewer than 10 organoids for a given study.”
“Our goal with this work was to develop a sensor that performs well, can be scaled up in an affordable way, and that is easy to use,” says Albert Keung, co-corresponding author of the paper on the work and an associate professor of chemical and biomolecular engineering at North Carolina State University.
To address these challenges, the researchers developed a device they call CAMEO – Conformal Array for Monitoring Electrophysiology of Organoids. The device consists of 12 carbon nanotube strands suspended in the shape of a basket. The carbon nanotubes are processed in a way that preserves the material’s flexibility and sensitivity to electrical signals. In practice, the organoid is suspended in the CAMEO, like an egg in a basket. The end of each strand is exposed, creating an electrode that can detect electrical signals from the organoid. The signals are then transmitted through the carbon nanotube strand to a device that can record electrical activity.
In proof-of-concept testing, the researchers demonstrated that CAMEO was capable of monitoring electrical activity in organoids, that it could detect the low-amplitude signals that are critical to biological research, and that it was able to detect signal changes that are triggered by chemicals that stimulate electrical activity in neurological systems.
“This work was very interdisciplinary and really benefited from Navya’s adventurousness to integrate principles from electrical engineering and neurodevelopmental biology,” says Keung.
“We have shown that CAMEO’s performance is comparable to previous technologies used to monitor electrical activity in organoids,” says Mishra. “The big difference is that our microelectrode array uses relatively inexpensive materials and is much less difficult to manufacture, making it substantially less costly. This should make it much easier to scale up, allowing researchers to conduct more large-scale studies.
“Hopefully, many labs will adopt CAMEO, because having a standardized data-collection format will make it much easier for the research community to share data effectively – because they’ll be using the same plug-and-play system,” says Mishra.
Reference material: What Is: Organoid
Funding: This work was done with support from the Foundation for Angelman Syndrome Therapeutics under grant FT2022-02, and from the National Science Foundation under grant 2025064.
Disclosure: Mishra, Keung and Bandodkar have filed a disclosure to protect the intellectual property pertaining to the CAMEO technology.
Published in journal: npj Biosensing
Authors: Navya Mishra, Rajaram Kaveti, Pei Liu, Baha Erim Uzunoglu, Aram Mirabedini, Anna Tran, Z. Begum Yagci, Tyler Johnson, Parvez Ahmmed, Qiuli Wang, Jeong Yong Kim, Paris Brown, Surjendu Maity, Shyni Varghese, Michael D. Dickey, Yong Zhu, Alper Bozkurt, Raudel Avila, Albert J. Keung, and Amay J. Bandodkar
Source/Credit: North Carolina State University | Matt Shipman
Reference Number: bio040226_01
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