Why are myofibroblasts important?

• A. Helps with wound closure
• B. Regulates blood flow
• C. Promotes bone remodeling
• D. Transmits nerve signals

Answer: (A)

Myofibroblasts play a key role in wound healing by driving wound closure through contraction of the wound edges. They arise from resident fibroblasts under signals in the healing environment, such as transforming growth factor-beta and mechanical tension, and they acquire contractile properties by expressing alpha-smooth muscle actin. This contractile activity pulls the margins of the wound together, reducing the gap and enabling reepithelialization and tissue repair. They also contribute to the build-up of extracellular matrix to form a scar.

This function is distinct from regulating blood flow (that’s a job for vascular smooth muscle and endothelial cells), promoting bone remodeling (that involves osteoblasts and osteoclasts), or transmitting nerve signals (that requires neurons). So, the best answer is that myofibroblasts help with wound closure.