Cannabinoid CB2 receptors are involved in the regulation of fibrogenesis during skin wound repair in mice

Li,Shan‑Shan; Wang,Lin‑Lin; Liu,Min; Jiang,Shu‑Kun; Zhang,Miao; Tian,Zhi‑Ling; Wang,Meng; Li,Jiao‑Yong; Zhao,Rui; Guan,Da‑Wei

doi:10.3892/mmr.2016.4961

Cannabinoid CB2 receptors are involved in the regulation of fibrogenesis during skin wound repair in mice

Authors:
- Shan‑Shan Li
- Lin‑Lin Wang
- Min Liu
- Shu‑Kun Jiang
- Miao Zhang
- Zhi‑Ling Tian
- Meng Wang
- Jiao‑Yong Li
- Rui Zhao
- Da‑Wei Guan
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Affiliations: Department of Forensic Pathology, School of Forensic Medicine, China Medical University, Shenyang, Liaoning 110122, P.R. China
Published online on: March 2, 2016 https://doi.org/10.3892/mmr.2016.4961
Pages: 3441-3450
Copyright: © Li et al. This is an open access article distributed under the terms of Creative Commons Attribution License.

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Abstract

Studies have shown that cannabinoid CB2 receptors are involved in wound repair, however, its physiological roles in fibrogenesis remain to be elucidated. In the present study, the capacity of cannabinoid CB2 receptors in the regulation of skin fibrogenesis during skin wound healing was investigated. To assess the function of cannabinoid CB2 receptors, skin excisional BALB/c mice were treated with either the cannabinoid CB2 receptor selective agonist, GP1a, or antagonist, AM630. Skin fibrosis was assessed by histological analysis and profibrotic cytokines were determined by immunohistochemistry, immunofluorescence staining, reverse transcription‑quantitative polymerase chain reaction and immunoblotting in these animals. GP1a decreased collagen deposition, reduced the levels of transforming growth factor (TGF)‑β1, TGF‑β receptor I (TβRI) and phosphorylated small mothers against decapentaplegic homolog 3 (P‑Smad3), but elevated the expression of its inhibitor, Smad7. By contrast, AM630 increased collagen deposition and the expression levels of TGF‑β1, TβRI and P‑Smad3. These results indicated that cannabinoid CB2 receptors modulate fibrogenesis and the TGF‑β/Smad profibrotic signaling pathway during skin wound repair in the mouse.

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