Scientists Discover HDAC5 Enzyme Key to Healing Chronic Wounds

Chronic wounds affect millions worldwide, particularly diabetics and elderly patients, often leading to serious complications. This groundbreaking study reveals a previously unknown mechanism controlling how skin repairs itself after injury.

Researchers discovered that HDAC5, an enzyme typically known for modifying histones in the nucleus, plays a critical role in wound healing when it relocates to the cell's cytoplasm. Using human tissue samples and mouse models, they found that cytoplasmic HDAC5 removes acetyl groups from a protein called ACTN4, allowing ACTN4 to enter the nucleus and activate healing genes.

The team traced this pathway further, showing that activated ACTN4 works with transcription factor YBX1 to increase production of cystatin A, a protein that accelerates the formation of new skin tissue over wounds. Single-cell analysis of healing wounds confirmed this molecular cascade drives reepithelialization—the critical process where new skin cells migrate to close wounds.

Most importantly, researchers identified a compound called G194-0712 that selectively activates HDAC5. When tested in three different mouse models of impaired healing—diabetic wounds, oxygen-starved tissue, and radiation damage—this HDAC5 activator significantly improved wound closure rates.

These findings could transform treatment for the estimated 6.5 million Americans suffering from chronic wounds. Current therapies often fail because they don't address the underlying cellular dysfunction. By targeting HDAC5, clinicians might finally have a way to restart stalled healing processes, potentially preventing amputations and reducing healthcare costs.