The team also found that the immortality of severed tissues is, to the best of our knowledge, unique to P. fabricii. The researchers conducted comparative experiments on explanted tissues from related sea cucumber species, and none showed equivalent tissue survival.<\/p>\n
Zombie cucumbers<\/p>\n
Back in 1951, doctors at Johns Hopkins Hospital in Baltimore took a sample of a malignant cervical tumor from Henrietta Lacks, a 31-year-old mother of five. When they cultured these cells later, they noticed that they doubled every 24 hours in a seemingly never-ending cycle. The HeLa cells, named after the patient, were the first instance of cell immortality ever discovered in humans. \u201cThis revolutionized cell biology and a lot of medical research,\u201d Jobson says.<\/p>\n
HeLa, though, was just a single cell type. LiPfe offers a new experimental model that enables scientists to work with a structured piece of animal tissue that maintains its own immune activity, cell cycling, and nutrient intake, without ethical concerns that come with experimenting on live animals. \u201cOn the evolutionary tree, sea cucumbers are relatively close to mammals, and they have been previously noted as having potential for interdisciplinary research,\u201d Jobson said.<\/p>\n
The authors of the study also point out that finding naturally immortal complex tissues challenges our conventional perceptions of what being alive really means. \u201cThe question we get a lot is \u2018are these tissues actually alive?\u2019 and this is where it becomes kind of philosophical\u2014we lovingly call them zombies,\u201d Jobson said.<\/p>\n
LiPfe explants are not dead because their tissue is not decaying or degrading, and it does absorb nutrients. On the other hand, LiPfe orbs don\u2019t reproduce, and reproduction is one of the fundamental characteristics of life. \u201cThey\u2019re not growing into a new sea cucumber but restructuring into a form that best suits them in their current state,\u201d Jobson said. \u201cSo, they seem to be functioning as a whole new entity.\u201d<\/p>\n
Before resolving philosophical dilemmas about LiPfe, the team wants to understand the basics first. The first question is how tissue immortality in P. fabricii actually works. \u201cIs there anything unique, rare, weird that we haven\u2019t seen in other sea cucumbers that makes them able to do this?\u201d Jobson wondered. The second question is why it\u2019s there in the first place\u2014whether there is an evolutionary role of this ability or if it\u2019s just a byproduct of really high regenerative capacity.<\/p>\n
Finally, we still don\u2019t know how long P. fabricii with their immortal tissues actually live. \u201cThat\u2019s a great question,\u201d Jobson said. \u201cUnfortunately, there are very few tools that work for aging sea cucumbers.\u201d<\/p>\n