Carnosine, histidine, and wound healing

Area of Science:

• Biochemistry
• Physiology
• Wound Healing Research

Background:

• Histidine is an essential amino acid crucial for growth and physiological processes.
• Carnosine, a dipeptide containing histidine, plays roles in cellular protection and metabolism.
• Nutritional status, particularly amino acid availability, can significantly impact tissue repair and regeneration.

Purpose of the Study:

• To investigate the impact of histidine intake on wound healing in rats.
• To determine the effects of histidine and carnosine supplementation on healing parameters in histidine-deficient rats.
• To explore the potential role of carnosine as a histidine reserve during wound healing and stress.

Main Methods:

• Rats were fed diets with adequate (100%) or deficient (50%) histidine levels.
• Standardized skin wounds were created, and polyvinyl chloride sponges were implanted.
• Measurements included skin-breaking strength, collagen deposition, and tissue concentrations of histidine and carnosine.
• Supplementation with histidine or carnosine was administered to deficient rats post-wounding.

Main Results:

• Histidine-sufficient rats exhibited superior wound healing, evidenced by increased skin-breaking strength and collagen deposition.
• Histidine and carnosine treatments normalized healing in histidine-deficient rats.
• Carnosine treatment showed slightly superior results compared to histidine treatment in improving wound healing.
• Adequate histidine intake led to higher tissue concentrations of free histidine and carnosine.

Conclusions:

• Adequate histidine intake is vital for optimal wound healing.
• Carnosine and histidine supplementation can effectively enhance wound repair in states of histidine deficiency.
• Carnosine may function as a histidine reserve, particularly relevant during physiological stress and trauma, influencing histamine synthesis.