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Wang X, Xu G, Zhang F, Wei Y, Deng J, Mu L, He J, He D, Yin M, Dal Pra I, Liu X, Cai W, Yang L, Han C, Huang G, Wu J. eIF6 modulates skin wound healing by upregulating keratin 6B. Stem Cells Transl Med 2024; 13:1101-1112. [PMID: 39406496 PMCID: PMC11555475 DOI: 10.1093/stcltm/szae064] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/05/2024] [Accepted: 06/08/2024] [Indexed: 11/13/2024] Open
Abstract
Eukaryotic translation initiation factor 6 (eIF6) plays a crucial role in 60S ribosome biogenesis and protein translation, as well as in hypertrophic scar formation, but its potential role in epithelialization is still poorly understood. Herein, we found that eIF6 negatively correlated with the wound healing process. Mice with genetically knockdown eIF6 (eIF6+/-) showed faster re-epithelization as shown by the longer tongue of the newly formed epidermis. Furthermore, eIF6 ablation accelerated the wound healing process by targeting basal keratinocytes in the eIF6 keratinocyte-conditional knockout (eIF6f/+; Krt5-Cre+) mice. Mechanistically, keratin 6B, an important wound-activated protein, was significantly upregulated in eIF6f/+; Krt5-Cre+ mice skin as proved by RNA-seq, western immunoblots, and immunofluorescence staining. Moreover, an elevated level of KRT6B and accelerated proliferative capacity were also observed in stable knockdown eIF6 HaCaT cells. Taken together, eIF6 downregulation could accelerate epithelialization by upregulating KRT6B expression and promoting keratinocyte proliferation. Our results for the first time indicate that eIF6 might be a novel target to regulate re-epithelialization.
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Affiliation(s)
- Xiaoyan Wang
- Department of Burn and Plastic Surgery, The First Affiliated Hospital of Shenzhen University, Shenzhen 518035, People’s Republic of China
- Department of Burn and Wound Repair Surgery, Guangdong Provincial People’s Hospital, Guangzhou 510080, People’s Republic of China
| | - Guangchao Xu
- Department of Burn and Plastic Surgery, The First Affiliated Hospital of Shenzhen University, Shenzhen 518035, People’s Republic of China
- Department of Burns and Plastic Surgery, Affiliated Hospital of Zunyi Medical University, Zunyi 563000, People’s Republic of China
- The Collaborative Innovation Center of Tissue Damage Repair and Regeneration Medicine of Zunyi Medical University, Zunyi 563000, People’s Republic of China
| | - Fangyingnan Zhang
- Department of Burn and Plastic Surgery, The First Affiliated Hospital of Shenzhen University, Shenzhen 518035, People’s Republic of China
| | - Yating Wei
- Department of Burn and Plastic Surgery, The First Affiliated Hospital of Shenzhen University, Shenzhen 518035, People’s Republic of China
| | - Jiawen Deng
- Department of Burn and Plastic Surgery, The First Affiliated Hospital of Shenzhen University, Shenzhen 518035, People’s Republic of China
| | - Lan Mu
- Department of Burn and Plastic Surgery, The First Affiliated Hospital of Shenzhen University, Shenzhen 518035, People’s Republic of China
| | - Jinqing He
- Department of Burn and Plastic Surgery, The First Affiliated Hospital of Shenzhen University, Shenzhen 518035, People’s Republic of China
| | - Dehua He
- Department of Burn and Plastic Surgery, The First Affiliated Hospital of Shenzhen University, Shenzhen 518035, People’s Republic of China
| | - Meifang Yin
- Department of Burn and Plastic Surgery, The First Affiliated Hospital of Shenzhen University, Shenzhen 518035, People’s Republic of China
| | - Ilaria Dal Pra
- Section of Human Histology & Embryology, Department of Surgery, Dentistry, Paediatrics & Obstetrics, University of Verona, Verona, Venetia, Italy
| | - Xiaofang Liu
- Department of Burn and Plastic Surgery, The First Affiliated Hospital of Shenzhen University, Shenzhen 518035, People’s Republic of China
| | - Weichao Cai
- Department of Plastic Surgery, Taizhou Hospital of Zhejiang Province Affiliated to Wenzhou Medical University, Taizhou 317000, People’s Republic of China
| | - Linjing Yang
- Department of Plastic Surgery, Taizhou Hospital of Zhejiang Province Affiliated to Wenzhou Medical University, Taizhou 317000, People’s Republic of China
| | - Chunmao Han
- Department of Burns and Wound Care Center, The Second Affiliated Hospital of Zhejiang University School of Medicine, Hangzhou 310009, People’s Republic of China
| | - Guangtao Huang
- Department of Burn and Plastic Surgery, The First Affiliated Hospital of Shenzhen University, Shenzhen 518035, People’s Republic of China
| | - Jun Wu
- Department of Burn and Plastic Surgery, The First Affiliated Hospital of Shenzhen University, Shenzhen 518035, People’s Republic of China
- Section of Human Histology & Embryology, Department of Surgery, Dentistry, Paediatrics & Obstetrics, University of Verona, Verona, Venetia, Italy
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Peng X, Yuan S, Tan J, Ma B, Bian X, Xu C, He W, Cao H, Huang Z, Cui Y, Gan C, Wang X, Zhou J, Hu J, Yang S, Luo G, Wu J. Identification of ITGB4BP as a new interaction protein of P311. Life Sci 2012; 90:585-90. [DOI: 10.1016/j.lfs.2012.02.008] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/06/2011] [Revised: 12/21/2011] [Accepted: 02/02/2012] [Indexed: 11/30/2022]
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Galarneau L, Loranger A, Gilbert S, Marceau N. Keratins modulate hepatic cell adhesion, size and G1/S transition. Exp Cell Res 2006; 313:179-94. [PMID: 17112511 DOI: 10.1016/j.yexcr.2006.10.007] [Citation(s) in RCA: 70] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/22/2006] [Revised: 09/26/2006] [Accepted: 10/02/2006] [Indexed: 12/31/2022]
Abstract
Keratins (Ks) are the intermediate filament (IF) proteins of epithelial cells. Hepatocyte IFs are made solely of keratins 8 and 18 (K8/K18), the hallmark of all simple epithelia. While K8/K18 are essential for maintaining structural integrity, there is accumulating evidence indicating that they also exert non-mechanical functions. We have reported recently that K8/K18-free hepatocytes from K8-null mice are more sensitive to Fas-mediated apoptosis, in line with an increased Fas density at the cell surface and an altered c-Flip regulation of the anti-apoptotic ERK1/2 signaling pathway. In the present study, we show that K8-null hepatocytes attach more rapidly but spread more slowly on a fibronectin substratum and undergo a more efficient G1/S transition than wild-type hepatocytes. Moreover, plectin, an IF associated protein, receptor for activated C kinase 1 (RACK1), a plectin partner, and vinculin, a key component of focal adhesions, distribute differently in spreading K8-null hepatocytes. Cell seeding leads to no differential activation of ERK1/2 in WT versus K8-null hepatocytes, whereas a stronger Akt activation is detected in K8-null hepatocytes. Insulin stimulation also leads to a differential Akt activation, implying altered Akt signaling capacity as a result of the K8/K18 loss. In addition, a delayed autophosphorylation of FAK, a target for integrin beta1 signaling, was obtained in seeding K8-null hepatocytes. These alterations in cell cycle-related events in hepatocytes in primary culture are also found in a K8-knockdown H4-II-E-C3 rat hepatoma cell line. Besides, K8/K18-free cells are smaller and exhibit a reduced rate of protein synthesis. In addition, a distinctive cyclin interplay is observed in these K8/K18-free hepatic cells, namely a more efficient cyclin A-dependent G1/S phase transition. Furthermore, K8 re-expression in these cells, following transfer of a human K8 cDNA, restores proper cell size, spreading and growth. Together, these results suggest new interrelated signaling roles of K8/18 with plectin/RACK1 in the modulation of cell attachment/spreading, size/protein synthesis and G1/S transition.
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Affiliation(s)
- Luc Galarneau
- Centre de Recherche en Cancérologie, Quebec City, QC, Canada G1R 2J6
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