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Can a Jellyfish Unlock the Secret of Immortality and Reversal of Aging?

Can a Jellyfish Unlock the Secret of Immortality and Reversal of Aging? | Browsing around | Scoop.it

Christian Sommer, a German marine-biology student in his early 20s, was conducting research on hydrozoans, small invertebrates that, depending on their stage in the life cycle, resemble either a jellyfish or a soft coral. Every morning, Sommer went snorkeling in the turquoise water off the cliffs of Portofino, Italy. He scanned the ocean floor for hydrozoans, gathering them with plankton nets. Among the hundreds of organisms he collected was a tiny, relatively obscure species known to biologists as Turritopsis dohrnii. Today it is more commonly known as the immortal jellyfish. Sommer kept his hydrozoans in petri dishes and observed their reproduction habits. After several days he noticed that his Turritopsis dohrnii was behaving in a very peculiar manner, for which he could hypothesize no earthly explanation. Plainly speaking, it refused to die. It appeared to age in reverse, growing younger and younger until it reached its earliest stage of development, at which point it began its life cycle anew.

 

Sommer was baffled by this development but didn’t immediately grasp its significance. (It was nearly a decade before the word “immortal” was first used to describe the species.) But several biologists in Genoa, fascinated by Sommer’s finding, continued to study the species, and in 1996 they published a paper called “Reversing the Life Cycle.” The scientists described how the species — at any stage of its development — could transform itself back to a polyp, the organism’s earliest stage of life, “thus escaping death and achieving potential immortality.” This finding appeared to debunk the most fundamental law of the natural world — you are born, and then you die. One of the paper’s authors, Ferdinando Boero, likened the Turritopsis to a butterfly that, instead of dying, turns back into a caterpillar. Another metaphor is a chicken that transforms into an egg, which gives birth to another chicken. The anthropomorphic analogy is that of an old man who grows younger and younger until he is again a fetus. For this reason Turritopsis dohrnii is often referred to as the Benjamin Button jellyfish.

 

Some progress has been made, however, in the quarter-century since Christian Sommer’s discovery. We now know, for instance, that the rejuvenation of Turritopsis dohrnii and some other members of the genus is caused by environmental stress or physical assault. We know that, during rejuvenation, it undergoes cellular transdifferentiation, an unusual process by which one type of cell is converted into another — a skin cell into a nerve cell, for instance. (The same process occurs in human stem cells.) But we still don’t understand how it ages in reverse.

 

Immortality is, to a certain degree, a question of semantics. “That word ‘immortal’ is distracting,” says James Carlton, the professor of marine sciences at Williams. “If by ‘immortal’ you mean passing on your genes, then yes, it’s immortal. But those are not the same cells anymore. The cells are immortal, but not necessarily the organism itself.” To complete the Benjamin Button analogy, imagine the man, after returning to a fetus, being born again. The cells would be recycled, but the old Benjamin would be gone; in his place would be a different man with a new brain, a new heart, a new body. He would be a clone.


Via Dr. Stefan Gruenwald
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Corea Nord: taglia 'telefono rosso' militare con Sud - Mondo - ANSA.it

Corea Nord: taglia 'telefono rosso' militare con Sud - Mondo - ANSA.it | Browsing around | Scoop.it
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▶ Fudoshin Ryu Aikijujutsu Demonstratie - YouTube

Wspomnienia ze stażu z mistrzem Giampietro Savegnago. Na stażu w Szczecinie mistrz po raz pierwszy zaprezentował V kata (ku czci swojego zmarłego nauczyciela...
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Allarme Unicef, nel mondo muoiono 18 mila bambini al giorno - Speciali - ANSA.it

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Lo 'strano asilo' di baby Ronzulli: Parlamento europeo - Photostory Primopiano - ANSA.it

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Rallenta caduta prestiti, ma ancora -3,8% - Economia

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Iran a Ginevra per nucleare, stavolta accordo possibile - Mondo

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Industria, a settembre ripartono gli ordinativi - Economia

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Women in Aikido | Aikido Lessons

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Randori Aiki class 2013

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Scuola Aikido Massafra

Molti sono scettici sulla capacità di una donna di fare un buon Aikido.... Ilaria Barulli ci dimostra il contrario !!!
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How to Do Sumi Otoshi | Aikido Lessons

Learn how to do sumi otoshi from the instructors at The New York Aikikai in this Howcast aikido video.
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Sardegna: verso lutto nazionale - Speciali - ANSA.it

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'It's more awkward as a Muslim woman at home' - The Local

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Tlc: Garante, stop a stalking 'telefonate mute' - Politica

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Salta trattativa su indesit. Presto nuovo tavolo - Economia

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Lite per lavoro non pagato: ucciso un uomo, ferito figlio - Campania - ANSA.it

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JPMorgan patteggia, accordo da 13 miliardi con gli Usa su mutui subprime - Economia

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Aikido Shudokan - Women's Self Defence

Vivienne Richards, 1st Dan, demonstrates women's self-defence, including self-defence with a scarf, at the Aikido Shudokan 20th Annual Demonstration in Septe...
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Aikido test - Elena House (14 yrs)

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Part of Yondan Demo - Carolina van Haperen, 4th dan (June 2011)

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Randori Aiki class 2013

Aiki class Randori with students, using a bit resistance - february 2013 Budo Club de l'Europe - Genève
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Scuola Aikido Massafra

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Carrello spesa -1,8% giù pasta, frutta, uova - Economia

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