Strange Machines

Unfortunately for us humans (and cats too, sorry) we’re unable to regenerate any of our parts with our stem cells like our invertebrate relative, the sea squirt. Not yet at least but scientists are working on it.

… regeneration (for the sea squirt) began from dozens of tiny compartments loaded with stem cells, which the researchers dubbed regeneration niches. “In mammals, many adult organs and tissues contain specific stem cells that are involved in repair and some restricted regeneration abilities,” biologist Ram Reshef at Technion Israel Institute of Technology in Haifa said.

Regenerating our bits would mean a longer life as we turn in our old parts for new ones. It’s one of the touted killer apps for longevity and anti-aging advocates. Right now, all we have is calorie restriction and it’s often a tough one to follow (think: pineapple tarts).

While the stem cells the researchers looked at are much like stem cells in adult mammals that give rise to our tissues and organs, “the huge difference is that they culminate in an entire organism,” Reshef said. The most important implication of their finding is the possibility that vertebrate adult tissue stem cells may exhibit the same capabilities to generate any cell in the body, he added.

Reshef and his colleagues are currently teasing apart the molecular mechanisms by which the sea squirt accomplishes its whole body regeneration and to compare that process with similar mechanisms in other invertebrates and vertebrates. “We speculate that vertebrates altered or suppressed parts or all of this ability,” Reshef said.

Hope for us, no?

(Source: LiveScience – Sea Squirt Regrows Entire Body from One Blood Vessel)