Sea Cucumber Tissue Survives Years After Being Cut from the Body, Study Finds
Scientists have discovered that tissue fragments removed from scarlet sea cucumbers can continue to live, heal, and function independently for at least three years. The study, published in the peer-reviewed journal Science Advances, found that detached pieces of tube feet and tentacles absorbed nutrients, maintained immune and metabolic activity, and even responded to touch. Researchers say the findings challenge existing definitions of tissue life and could have significant implications for regenerative medicine and tissue engineering.
A team of Canadian scientists studying the scarlet sea cucumber has found that tissue fragments cut from the animal's body do not simply die but continue to function autonomously for years. In experiments, removed pieces of tube feet and tentacles healed wounds, absorbed nutrients directly from seawater, and maintained immune, metabolic, and cellular activity over a period of at least three years. Some isolated tentacles retained sensitivity to touch, indicating that a neural network remained intact within the detached tissue. Notably, the tissue survived not in sterile laboratory conditions but in natural running seawater — one of the most microbially diverse environments possible — which the researchers suggest may have actually supported the tissue's survival by providing organic matter and nutrients. The study's authors argue the results 'challenge conventional perceptions of tissue immortality' and call for 'a redefinition of what it means for tissue to be alive.' While immortal cell lines have been created in labs before, sustaining structurally intact animal tissue for years outside a controlled setting is considered far more difficult. The team believes the findings open a new class of ethical experimental model with broad applications in regenerative biology and biomedical research.
Limitations & open questions
The study does not clarify whether the detached tissue has any capacity to regenerate a whole organism, or what the upper limit of its survival duration might be. It is also unclear how broadly these findings apply to other sea cucumber species or to animals more generally.
What different sources said
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'A redefinition of what it means ... to be alive': Sea cucumber tissue cut from the body still refuses to die
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