Researchers have discovered two important pathways that control stem cell function. One pathway signals cell repair, while the other inhibits cell repair.

When cells get worn out or damaged, certain biochemical signals trigger adult stem cells to start working to repair tissue.

As we grow older, the stem cells in the older tissue are inhibited by certain chemical signals from reacting as they normally would.

In the study, the researchers discovered that when placed in the proper environment and exposed to the appropriate signals, older tissue can repair itself once again.

This discovery is exciting news because it demonstrates that adult stem cells can be used to revive degenerating tissue and eliminates the controversy and problems associated with embryonic stem cell experimentation.

For additional information, see:

• Stem Cell Researchers Give Old Muscle New Pep (Science Daily)