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Similarities and differences between induced organ regeneration in adults and early foetal regeneration Yannas IVJ R Soc Interface 2005[Dec]; 2 (5): 403-17At least three organs (skin, peripheral nerves and the conjunctiva) have been induced to regenerate partially in adults following application of porous, degradable scaffolds with highly specific structure (templates). Templates blocked contraction and scar formation by inducing a reduction in the density of contractile fibroblasts (probably myofibroblasts) and by preventing these cells to organize themselves appropriately in the wound. In contrast, during early foetal healing, myofibroblasts were absent and wounds did not close by contraction but rather by spontaneous regeneration. The adult regenerative process has so far led to imperfect recovery of the physiological anatomy of skin (skin appendages were missing), while early foetal healing has led to apparently complete restoration. Furthermore, the mechanism of the adult regenerative process involves thwarting of myofibroblast function while, during early foetal healing, differentiation of myofibroblasts has not yet occurred. The data suggest that induced organ regeneration in the adult is the result of partial reversion to early foetal healing. If so, the adult may conceal a foetal response that may be subject to activation following application of highly active scaffolds or of other substances or cells.|*Models, Biological[MESH]|Adult[MESH]|Animals[MESH]|Bioartificial Organs[MESH]|Body Patterning/*physiology[MESH]|Fetus/*physiology[MESH]|Guided Tissue Regeneration/*methods[MESH]|Humans[MESH]|Organogenesis/*physiology[MESH]|Regeneration/*physiology[MESH]|Wound Healing/*physiology[MESH] |
