A new biotech startup, R3 Bio, is pitching a radical idea to replace animal testing: nonsentient 'organ sacks' that contain all the typical organs except a brain, rendering them unable to think or feel pain. This concept is gaining traction as the Trump administration phases out the use of animal experimentation across the federal government.
According to R3 Bio cofounder Alice Gilman, the company's long-term goal is to make human versions of these organ sacks that could be used as a source of tissues and organs for people who need them. For now, R3 is aiming to make monkey organ sacks, which could be used for drug toxicity testing and potentially replace the need for live monkeys in research.
Inside the Platform
R3 Bio's idea is backed by Immortal Dragons, a Singapore-based longevity fund, which sees replacement as a core strategy for human longevity. CEO Boyang Wang believes that creating a nonsentient, headless bodyoid for a human being could be a great source of organs. The company is exploring a combination of stem-cell technology and gene editing to create these organ sacks.
Stem cell biologist Paul Knoepfler from the University of California, Davis, suggests that it's plausible to grow organ sacks from induced pluripotent stem cells, which can be reprogrammed to form any cell or tissue in the body. By editing these stem cells, scientists could disable genes needed for brain development, resulting in an embryo that grows into organized organ structures without a brain.
The Infrastructure Question
The US Animal Welfare Act requires minimizing pain and distress for research animals, but it's not always possible. With over 60,000 nonhuman primates used in testing and experimentation in fiscal year 2024, the need for alternative methods is pressing. R3 Bio's ambitions go beyond replacing animal testing, as the company aims to create nonsentient human organ sacks that could provide blood, tissue, and organs to people when their own bodies fail them.
Bioethicist Hank Greely from Stanford University notes that creating living entities without a brain raises ethical questions about their potential to feel pain or have awareness. However, he believes that if done correctly, these organ sacks could revolutionize medicine. The concept is still highly theoretical, but with backing from billionaire Tim Draper and LongGame Ventures, R3 Bio is pushing forward with its research.
Power and Control
The idea of growing human organs from scratch has been a longtime goal of regenerative medicine. While genetically engineered pig organs are being explored as one solution to the organ shortage, R3 Bio's approach raises questions about the potential for human 'bodyoids' that lack sentience. As Greely notes, getting buy-in from the public will be crucial, given the unsettling nature of this concept.
As R3 Bio continues to work on its technology, the company is seeking a veterinarian in Puerto Rico to implant embryos, monitor pregnancies, and help deliver healthy births in nonhuman primates. With the potential to revolutionize the field of organ replacement, R3 Bio's 'organ sacks' are an idea worth watching, even if they challenge our conventional understanding of what it means to be human.
