Expression levels of 3 cytokines in judging the injury time in the healing process of mouse skin wounds
- VernacularTitle:小鼠皮肤创伤修复中3种细胞因子表达水平对损伤时间的评估
- Author:
Huijun WANG
;
Xuefeng LI
;
Ming LIU
- Publication Type:Journal Article
- From:
Chinese Journal of Tissue Engineering Research
2005;9(14):-
- CountryChina
- Language:Chinese
-
Abstract:
BACKGROUND: Wound healing is a complex biological process regulated temporally and spatially by many repair factors. Studies have showed the predominant expression of cytokines in wound healing process, which is a kind of molecular vital reaction, and may be a new reference index in wound age estimation. But the precise relation of the expressions of cytokines and distribution to wound age is not clear.OBJECTIVE: To probe into the relation of the expressions of cytokines and distribution to wound age in the healing process of the mouse skin wounds.DESIGN: A randomized controlled confirmation study based on the experimental animalsSETTING: Department of Pathology of the First Military University of Chinese PLA, which is a key laboratory of molecule oncology of Chinese PLA.MATERIALS: The study was completed in the Key Laboratory of Molecule Oncdogy of Chinese PLA from July to September in 2003. Sixty-five Kunming mice of either gender, weighing 25 - 28 g, were involved.INTERVENTIONS: The mice were randomly divided into the experimental and the control group. The mice in the experimental group were divided into 12 subgroups according to the different times of trauma. The mice were killed at the following time intervals: 15 minutes, 30 minutes, 1 hour, 3 hours, 6hours, 12 hours, 24 hours, 48 hours, 72 hours, 96 hours, 1 week or 2 weeks after wound and the wounded skin was excised( n = 5 each). As a control, 5mice without wounding were examined.MAIN OUTCOME MEASURES: The amount and distribution of staining positive inflammation and repair cells in skin wound tissues.RESULTS: Persistent positive expression of vascular endothelial growth factor(VEGF) was seen in the epidermal cells and sebaceous gland cells. The expressions of transforming growth factor β1(TGF-β1) and basic fibroblast growth factor (bFGF) in the epidermal cells were increased at 3 hours after incision and lasted till 12 hours and 48 hours respectively. There was a similar distribution in the positive amount of inflammation and repair cells among VEGF, TGF-β1 and bFGF. Six hours after injury, some of neutrophils showed positive reactions. After 12 hours, macrophages and fibroblasts were mainly positive cells. The number of the positive cells was increased with wound age,and the peak occurred at 96 hours. There were still some positive macrophages and fibroblasts at week 1 and week 2 after the incision.CONCLUSION: There was a time-related expression of TGF-β1 and bFGF in the epidermal cells in mouse skin wounds. The amount and distribution of inflammation and repair cells that express VEGF, TGF-β1 and bFGF were changed in a time-related manner in the healing process of mouse skin wounds.
