A New Perspective on Human Healing
For centuries, scientists believed that humans permanently lost the ability to regenerate complex body parts during evolution. Unlike salamanders and axolotls, which can regrow entire limbs, humans typically respond to serious injuries by forming scar tissue. However, a new study from Texas A&M University suggests that our bodies may still possess hidden regenerative abilities.
Researchers published the study in Nature Communications, where they showed that mammals may not have lost their regenerative capacity entirely. Instead, scientists believe the body simply switches off this remarkable ability during the normal healing process.
Reprogramming the Healing Process
The Texas A&M research team developed a two-step treatment that enabled mice to regenerate bone, joints, ligaments, and tendons after digit amputation. Rather than relying on stem cell transplants or genetic engineering, the scientists used two naturally occurring growth factors already found in the body.
First, the researchers applied Fibroblast Growth Factor 2 (FGF2) after the wound closed naturally. The protein redirected healing cells away from producing scar tissue and toward forming a blastema-like structure—a cluster of cells that serves as the foundation for regeneration in animals like salamanders.
Several days later, the researchers introduced Bone Morphogenetic Protein 2 (BMP2), prompting the cells to build new tissues. As a result, the treated mice regenerated bone, connective tissue, ligaments, and joints that they would not normally regrow.
Why This Discovery Matters
Although the regenerated tissues did not perfectly replicate the originals, they contained the essential components found at the injury site. This finding challenges the long-held belief that mammals completely lack regenerative abilities.
Importantly, the study suggests that the body already contains the cells needed for regeneration. Instead of adding stem cells from outside the body, future treatments may guide existing cells to repair damaged tissues more effectively.
Researchers believe this approach could reduce scar formation, improve recovery after traumatic injuries, and advance regenerative medicine. Since BMP2 is already approved for certain medical uses and FGF2 is undergoing clinical evaluation, this strategy could offer a more practical path toward future human therapies than many experimental techniques.
