Amazing stuff!
"The discovery, published in Nature Communications, challenges the prevailing view that the loss of stem cells in a tissue is an irreversible process that inevitably leads to tissue collapse and disease. According to this notion, significant regeneration of damaged tissue requires transplantation of external cells. The ... researchers show that this is not entirely accurate and that the body itself can activate an internal “reprogramming” mechanism for repair. ...
“We were surprised to discover that the cornea can regenerate itself even after the destruction of all its stem cells,” ... “What is even more surprising is the repair process itself. Following injury, even mature, aged cells undergo reprogramming and become stem cells that function throughout life and prevent disease development ... In other words, the body has a remarkable ability to replenish its own stem cell reservoir, a capacity usually attributed only to simple organisms that can, for example, regrow amputated limbs. While the ability to regenerate entire organs was indeed lost in complex organisms such as humans, our study shows that part of this capacity remains. This means that instead of relying solely on transplants or external interventions, we may one day be able to activate natural mechanisms that already exist within the body and harness them for healing.” ..."
From the abstract:
"Recent studies report that epithelial differentiated cells can undergo a reverse process called dedifferentiation in response to stem cell loss. However, the extent of this reversion and the plasticity of young versus aged-differentiated cells remain unclear.
Here we show that dedifferentiated corneal epithelial cells acquire a transcriptomic state closely resembling native stem cells, sustain tissue homeostasis across lifespan and efficiently repair repeated tissue injury. Transplantation of stage-specific genetically traceable aged differentiated epithelial cells onto a denuded niche reveals reversion into a stemness-like state, restoring both quiescent and active stem cell compartments.
This plasticity operates within the epithelial lineage, allowing transitions along the differentiation axis, but remains restricted across lineages, as transplanted conjunctival cells fail to regenerate the corneal stem cell pool.
Mechanistically, we identify niche-derived cytokines that trigger reprogramming in vivo and enhance stemness in primary human corneal epithelial cells, revealing a conserved and therapeutically exploitable pathway for epithelial regeneration."
Fig. 1: Dedifferentiated LSC-like cells capture the transcriptome like native LSCs.
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