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Changes in protein distribution in the rat during prolonged "systemic injury"
M Wusteman1, A Hayes, D Stirling
1MRC Dunn Nutrition Unit, Cambridge, United Kingdom.
The Journal of Surgical Research
|April 1, 1994
Summary
Systemic injury in rats caused significant protein loss from skin and muscle, impacting wound healing. This model highlights how prolonged injury affects tissue protein distribution and reduces skin tensile strength.
Area of Science:
- Physiology
- Biochemistry
- Wound Healing Research
Background:
- Understanding tissue protein dynamics during systemic injury is crucial for wound healing.
- Previous models did not adequately replicate prolonged systemic injury and its effects.
Purpose of the Study:
- To develop a rat model of prolonged systemic injury.
- To investigate changes in tissue protein distribution post-injury.
- To assess the impact of these changes on skin wound healing and tensile strength.
Main Methods:
- Induced prolonged systemic injury in rats using sequential turpentine injections.
- Measured plasma glutamine concentration and nitrogen distribution in liver, muscle, intestine, and skin.
- Assessed skin collagen content (hydroxyproline) and wound bursting strength.
Main Results:
- The model induced a sustained acute phase response and reduced plasma glutamine.
- Nitrogen content increased in the liver but decreased in muscle and skin.
- Skin thinning and reduced collagen were observed, leading to decreased wound bursting strength.
Conclusions:
- Prolonged systemic injury, independent of diet, causes preferential protein loss from peripheral tissues.
- Loss of skin protein and collagen significantly impairs the tensile strength of healing wounds.
- This model effectively demonstrates the link between systemic injury, protein catabolism, and compromised wound repair.