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A groundbreaking study published in Science Advances introduces the concept of natural tissue immortality through the observation of sea cucumber explants. Researchers isolated tissues from the species Psolus fabricii and observed their survival for over three years in non-sterile seawater. These explants, which the team named \"Lie\" (living immortal explants), continued to grow and function without any supplemental nutrients or artificial laboratory support. This phenomenon represents a significant shift in our understanding of biological senescence and tissue survival outside a host organism.
Furthermore, the study highlights that these explants do not simply persist in a dormant state. Instead, they exhibit active biological processes such as healing, internal tissue reorganization, and even nutrient absorption from their environment. Consequently, this discovery challenges the traditional terminal fate assigned to discarded or lost tissues in complex organisms. While many echinoderms possess high regenerative capacity, the indefinite survival of isolated P. fabricii tissue appears unique and currently has no parallel in biological literature.
The biological mechanisms driving natural tissue immortality in these explants are remarkably robust. Specifically, the researchers noted active cell cycling and immune responses within the tissue fragments. These \"Lie\" specimens successfully absorbed dissolved amino acids directly from the surrounding seawater to sustain their metabolic needs. Additionally, comparative experiments on related sea cucumber species showed no similar survival, suggesting that Psolus fabricii possesses specialized cellular pathways for long-term viability.
Moreover, the ethical implications of this discovery are profound for modern medicine. These immortal explants provide a new class of experimental models that do not involve vertebrate subjects. Therefore, scientists can utilize these tissues to study wound healing, drug toxicity, and cellular aging without the typical ethical constraints associated with animal testing. Ultimately, this model could accelerate breakthroughs in tissue engineering and regenerative medicine by providing a stable, long-lived biological platform.
From a clinical perspective, understanding the resilience of these tissues may unlock new strategies for human regenerative therapies. Researchers are particularly interested in how these explants maintain immune activity and prevent decay in non-axenic (non-sterile) conditions. If scientists can identify the molecular signals that allow these tissues to reorganize and survive indefinitely, they might apply similar principles to stabilize human grafts or improve the longevity of engineered organs. This research serves as a vital reminder of the untapped biological secrets within marine ecosystems that could revolutionize biomedical engineering.
'Lie' refers to tissue explants from the sea cucumber Psolus fabricii that demonstrate the ability to heal, grow, and survive indefinitely outside the host body in natural seawater.
It provides a unique, ethically sound model for studying long-term tissue survival and regeneration, potentially leading to new methods for stabilizing human tissue grafts and understanding cellular aging.
No, the study showed that these explants could sustain themselves by absorbing dissolved amino acids directly from natural seawater for more than three years.
Disclaimer: This content is for informational and educational purposes only. It does not constitute medical advice or a professional opinion. Readers should consult with qualified healthcare professionals for diagnosis and treatment. Refer to the latest local and national guidelines for clinical practice.
References
1. Jobson S et al. Natural tissue immortality: Indefinite survival of sea cucumber explants. Sci Adv. 2026 May 29. doi: undefined. PMID: 42202023.
2. Edwards S. The Ocean's “Real-Life Zombie” Is a Sea Cucumber Whose Amputated Tissue Survived for Three Years. Discover Magazine. 2026 May 28.
3. Science Media Centre Spain. Tissues taken from sea cucumbers remain intact for three years in natural seawater. 2026 May 27.
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The discovery of 'living immortal explants' in sea cucumbers challenges senescence paradigms and offers new potential for regenerative medicine....
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