Received:29 June 2020,
Published:15 January 2021
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Xing CHEN, Fen LUO, Zhizhong HUANG, et al. Effects of caffeine consumption on cutaneous wound healing and scar formation in mice[J]. Journal of Third Military Medical University, 2021, 43(1): 75-82.
Xing CHEN, Fen LUO, Zhizhong HUANG, et al. Effects of caffeine consumption on cutaneous wound healing and scar formation in mice[J]. Journal of Third Military Medical University, 2021, 43(1): 75-82. DOI: 10.16016/j.1000-5404.202006248.
Objective
2
To investigate the effect of caffeine consumption on skin wound healing and scar formation in mice.
Methods
2
The mouse model was established according to our previous method of chronic intervention with caffeine combined with the model of full-thickness skin wound on the back. Wound closure was traced every 2 days in each group using transparent film until the wound closed
and the scar areas were calculated at 30 d after healing. The sections were stained with hematoxylin-eosin (HE) to observe the changes in epithelial cells crawling and thickness of granulation tissue at 3
6 and 9 d after wounding
and scar width and the thinness-to-thickness ratio of the epithelium in the scar tissue at 30 d after healing with the aid of Labwork 4.0 software. Masson staining was used to analyze the collagen changes of the wound at 6 d after wounding and of the scar tissue at 30 d after healing. Immunohistochemical assay was used to observe the changes of CD31 and CD11b protein levels in wound tissue at 6 d after wounding.
Results
2
Results The healing time of caffeine group was delayed by 28.3%
and the scar area was reduced by 56.8% when compared with that of the control group. In the process of wound healing
the crawling length of epithelium and the thickness of granulation tissue were significantly decreased in the caffeine group than the control group (
P
<
0.01)
the collagen content and the expression level of CD31 in the wound were also decreased (
P
<
0.01)
and the expression level of CD11b was obviously enhanced (
P
<
0.01). Meanwhile
compared with the control group
the caffeine group had significantly decreased scar width (
P
<
0.01)
higher thickness of scar tissue epithelium (
P
<
0.01)
but similar collagen content in the scar and the surrounding undamaged subcutaneous collagen.
Conclusion
2
Caffeine consumption can delay the wound healing in mice
but attenuate scar formation.
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