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Huang Y, Zhang L, Tan L, Zhang C, Li X, Wang P, Gao L, Zhao C. Interleukin-22 Inhibits Apoptosis of Gingival Epithelial Cells Through TGF-β Signaling Pathway During Periodontitis. Inflammation 2023; 46:1871-1886. [PMID: 37310646 DOI: 10.1007/s10753-023-01847-w] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/11/2023] [Revised: 05/18/2023] [Accepted: 05/29/2023] [Indexed: 06/14/2023]
Abstract
Periodontitis is a chronic inflammatory disease characterized by the destruction of tooth-supporting tissues. The gingival epithelium is the first barrier of periodontal tissue against oral pathogens and harmful substances. The structure and function of epithelial lining are essential for maintaining the integrity of the epithelial barrier. Abnormal apoptosis can lead to the decrease of functional keratinocytes and break homeostasis in gingival epithelium. Interleukin-22 is a cytokine that plays an important role in epithelial homeostasis in intestinal epithelium, inducing proliferation and inhibiting apoptosis, but its role in gingival epithelium is poorly understood. In this study, we investigated the effect of interleukin-22 on apoptosis of gingival epithelial cells during periodontitis. Interleukin-22 topical injection and Il22 gene knockout were performed in experimental periodontitis mice. Human gingival epithelial cells were co-cultured with Porphyromonas gingivalis with interleukin-22 treatment. We found that interleukin-22 inhibited apoptosis of gingival epithelial cells during periodontitis in vivo and in vitro, decreasing Bax expression and increasing Bcl-xL expression. As for the underlying mechanisms, we found that interleukin-22 reduced the expression of TGF-β receptor type II and inhibited the phosphorylation of Smad2 in gingival epithelial cells during periodontitis. Blockage of TGF-β receptors attenuated apoptosis induced by Porphyromonas gingivalis and increased Bcl-xL expression stimulated by interleukin-22. These results confirmed the inhibitory effect of interleukin-22 on apoptosis of gingival epithelial cells and revealed the involvement of TGF-β signaling pathway in gingival epithelial cell apoptosis during periodontitis.
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Affiliation(s)
- Yina Huang
- Department of Periodontology, Hospital of Stomatology, Sun Yat-sen University, No.56, Lingyuanxi Road, Yuexiu District, Guangzhou, 510055, China
- Guangdong Provincial Key Laboratory of Stomatology, Guangzhou, China
- Guanghua School of Stomatology, Sun Yat-Sen University, Guangzhou, China
| | - Lu Zhang
- Department of Periodontology, Hospital of Stomatology, Sun Yat-sen University, No.56, Lingyuanxi Road, Yuexiu District, Guangzhou, 510055, China
- Guangdong Provincial Key Laboratory of Stomatology, Guangzhou, China
- Guanghua School of Stomatology, Sun Yat-Sen University, Guangzhou, China
| | - Lingping Tan
- Department of Periodontology, Hospital of Stomatology, Sun Yat-sen University, No.56, Lingyuanxi Road, Yuexiu District, Guangzhou, 510055, China
- Guangdong Provincial Key Laboratory of Stomatology, Guangzhou, China
- Guanghua School of Stomatology, Sun Yat-Sen University, Guangzhou, China
| | - Chi Zhang
- Department of Periodontology, Hospital of Stomatology, Sun Yat-sen University, No.56, Lingyuanxi Road, Yuexiu District, Guangzhou, 510055, China
- Guangdong Provincial Key Laboratory of Stomatology, Guangzhou, China
- Guanghua School of Stomatology, Sun Yat-Sen University, Guangzhou, China
| | - Xiting Li
- Department of Periodontology, Hospital of Stomatology, Sun Yat-sen University, No.56, Lingyuanxi Road, Yuexiu District, Guangzhou, 510055, China
- Guangdong Provincial Key Laboratory of Stomatology, Guangzhou, China
- Guanghua School of Stomatology, Sun Yat-Sen University, Guangzhou, China
| | - Panpan Wang
- Department of Periodontology, Hospital of Stomatology, Sun Yat-sen University, No.56, Lingyuanxi Road, Yuexiu District, Guangzhou, 510055, China
- Guangdong Provincial Key Laboratory of Stomatology, Guangzhou, China
- Guanghua School of Stomatology, Sun Yat-Sen University, Guangzhou, China
| | - Li Gao
- Department of Periodontology, Hospital of Stomatology, Sun Yat-sen University, No.56, Lingyuanxi Road, Yuexiu District, Guangzhou, 510055, China.
- Guangdong Provincial Key Laboratory of Stomatology, Guangzhou, China.
- Guanghua School of Stomatology, Sun Yat-Sen University, Guangzhou, China.
| | - Chuanjiang Zhao
- Department of Periodontology, Hospital of Stomatology, Sun Yat-sen University, No.56, Lingyuanxi Road, Yuexiu District, Guangzhou, 510055, China.
- Guangdong Provincial Key Laboratory of Stomatology, Guangzhou, China.
- Guanghua School of Stomatology, Sun Yat-Sen University, Guangzhou, China.
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Fu MM, Chin YT, Fu E, Chiu HC, Wang LY, Chiang CY, Tu HP. Role of transforming growth factor-beta1 in cyclosporine-induced epithelial-to-mesenchymal transition in gingival epithelium. J Periodontol 2016; 86:120-8. [PMID: 25272978 DOI: 10.1902/jop.2014.130285] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
Abstract
BACKGROUND It has been proposed that cyclosporin A (CsA) may induce epithelial-to-mesenchymal transition (EMT) in gingiva. The aims of the present study are to confirm the notion that EMT occurs in human gingival epithelial (hGE) cells after CsA treatment and to investigate the role of transforming growth factor beta1 (TGF-β1) on this CsA-induced EMT. METHODS The effects of CsA, with and without TGF-β1 inhibitor, on the morphologic changes of primary culture of hGE cells were examined in vitro. The changes of protein and messenger RNA (mRNA) expressions of two EMT markers (E-cadherin and alpha-smooth muscle actin) in the hGE cells after CsA treatment with and without TGF-β1 inhibitor were evaluated with immunocytochemistry and real-time polymerase chain reaction. RESULTS The epithelial cells became spindle-like, elongated, and disassociated from neighboring cells and lost their original cobblestone monolayer pattern when CsA was added. However, the epithelial cells stayed in their original cobblestone morphology with treatment of TGF-β1 inhibitor on top of the CsA treatment. When CsA was given, the protein and mRNA expressions of E-cadherin and α-SMA were significantly altered, and these alterations were significantly reversed with pretreatment of TGF-β1 inhibitor. CONCLUSIONS CsA could induce Type 2 EMT in gingiva by changing the morphology of epithelial cells and altering the EMT markers/effectors. The CsA-induced gingival EMT is dependent or at least partially dependent on TGF-β1.
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Affiliation(s)
- Martin M Fu
- Department of Periodontology, School of Dentistry, National Defense Medical Center and Tri-Service General Hospital, Taipei, Taiwan, ROC
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