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Gan L, Zheng L, Zou J, Luo P, Chen T, Zou J, Li W, Chen Q, Cheng L, Zhang F, Qian B. Critical roles of lncRNA-mediated autophagy in urologic malignancies. Front Pharmacol 2024; 15:1405199. [PMID: 38939836 PMCID: PMC11208713 DOI: 10.3389/fphar.2024.1405199] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/22/2024] [Accepted: 05/23/2024] [Indexed: 06/29/2024] Open
Abstract
Urologic oncology is a significant public health concern on a global scale. Recent research indicates that long chain non-coding RNAs (lncRNAs) and autophagy play crucial roles in various cancers, including urologic malignancies. This article provides a summary of the latest research findings, suggesting that lncRNA-mediated autophagy could either suppress or promote tumors in prostate, kidney, and bladder cancers. The intricate network involving different lncRNAs, target genes, and mediated signaling pathways plays a crucial role in urological malignancies by modulating the autophagic process. Dysregulated expression of lncRNAs can disrupt autophagy, leading to tumorigenesis, progression, and enhanced resistance to therapy. Consequently, targeting particular lncRNAs that control autophagy could serve as a dependable diagnostic tool and a promising prognostic biomarker in urologic oncology, while also holding potential as an effective therapeutic approach.
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Affiliation(s)
- Lifeng Gan
- The First Clinical College, Gannan Medical University, Ganzhou, Jiangxi, China
- Department of Urology, The First Affiliated Hospital of Gannan Medical University, Ganzhou, Jiangxi, China
- Key Laboratory of Urology and Andrology of Ganzhou, Ganzhou, Jiangxi, China
| | - Liying Zheng
- Department of Graduate, The First Affiliated Hospital of Gannan Medical University, Ganzhou, Jiangxi, China
| | - Junrong Zou
- Department of Urology, The First Affiliated Hospital of Gannan Medical University, Ganzhou, Jiangxi, China
- Key Laboratory of Urology and Andrology of Ganzhou, Ganzhou, Jiangxi, China
| | - Peiyue Luo
- The First Clinical College, Gannan Medical University, Ganzhou, Jiangxi, China
- Department of Urology, The First Affiliated Hospital of Gannan Medical University, Ganzhou, Jiangxi, China
- Key Laboratory of Urology and Andrology of Ganzhou, Ganzhou, Jiangxi, China
| | - Tao Chen
- The First Clinical College, Gannan Medical University, Ganzhou, Jiangxi, China
- Department of Urology, The First Affiliated Hospital of Gannan Medical University, Ganzhou, Jiangxi, China
- Key Laboratory of Urology and Andrology of Ganzhou, Ganzhou, Jiangxi, China
| | - Jun Zou
- The First Clinical College, Gannan Medical University, Ganzhou, Jiangxi, China
- Department of Urology, The First Affiliated Hospital of Gannan Medical University, Ganzhou, Jiangxi, China
- Key Laboratory of Urology and Andrology of Ganzhou, Ganzhou, Jiangxi, China
| | - Wei Li
- The First Clinical College, Gannan Medical University, Ganzhou, Jiangxi, China
- Department of Urology, The First Affiliated Hospital of Gannan Medical University, Ganzhou, Jiangxi, China
- Key Laboratory of Urology and Andrology of Ganzhou, Ganzhou, Jiangxi, China
| | - Qi Chen
- The First Clinical College, Gannan Medical University, Ganzhou, Jiangxi, China
- Department of Urology, The First Affiliated Hospital of Gannan Medical University, Ganzhou, Jiangxi, China
- Key Laboratory of Urology and Andrology of Ganzhou, Ganzhou, Jiangxi, China
| | - Le Cheng
- The First Clinical College, Gannan Medical University, Ganzhou, Jiangxi, China
- Department of Urology, The First Affiliated Hospital of Gannan Medical University, Ganzhou, Jiangxi, China
- Key Laboratory of Urology and Andrology of Ganzhou, Ganzhou, Jiangxi, China
| | - Fangtao Zhang
- The First Clinical College, Gannan Medical University, Ganzhou, Jiangxi, China
- Department of Urology, The First Affiliated Hospital of Gannan Medical University, Ganzhou, Jiangxi, China
- Key Laboratory of Urology and Andrology of Ganzhou, Ganzhou, Jiangxi, China
| | - Biao Qian
- Department of Urology, The First Affiliated Hospital of Gannan Medical University, Ganzhou, Jiangxi, China
- Key Laboratory of Urology and Andrology of Ganzhou, Ganzhou, Jiangxi, China
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Zhu Z, He M, Zhang T, Zhao T, Qin S, Gao M, Wang W, Zheng W, Chen Z, Liu L, Hao M, Zhou B, Zhang H, Wang J, Wang F, Xia G, Wang C. LSD1 promotes the FSH responsive follicle formation by regulating autophagy and repressing Wt1 in the granulosa cells. Sci Bull (Beijing) 2024; 69:1122-1136. [PMID: 38302330 DOI: 10.1016/j.scib.2024.01.015] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/08/2023] [Revised: 12/08/2023] [Accepted: 01/05/2024] [Indexed: 02/03/2024]
Abstract
In a growing follicle, the survival and maturation of the oocyte largely depend on support from somatic cells to facilitate FSH-induced mutual signaling and chemical communication. Although apoptosis and autophagy in somatic cells are involved in the process of FSH-induced follicular development, the underlying mechanisms require substantial study. According to our study, along with FSH-induced antral follicles (AFs) formation, both lysine-specific demethylase 1 (LSD1) protein levels and autophagy increased simultaneously in granulosa cells (GCs) in a time-dependent manner, we therefore evaluated the importance of LSD1 upon facilitating the formation of AFs correlated to autophagy in GCs. Conditional knockout of Lsd1 in GCs resulted in significantly decreased AF number and subfertility in females, accompanied by marked suppression of the autophagy in GCs. On the one hand, depletion of Lsd1 resulted in accumulation of Wilms tumor 1 homolog (WT1), at both the protein and mRNA levels. WT1 prevented the expression of FSH receptor (Fshr) in GCs and thus reduced the responsiveness of the secondary follicles to FSH induction. On the other hand, depletion of LSD1 resulted in suppressed level of autophagy by upregulation of ATG16L2 in GCs. We finally approved that LSD1 contributed to these sequential activities in GCs through its H3K4me2 demethylase activity. Therefore, the importance of LSD1 in GCs is attributable to its roles in both accelerating autophagy and suppressing WT1 expression to ensure the responsiveness of GCs to FSH during AFs formation.
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Affiliation(s)
- Zijian Zhu
- State Key Laboratory of Farm Animal Biotech Breeding, College of Biological Sciences, China Agricultural University, Beijing 100193, China
| | - Meina He
- College of Basic Medicine, Guizhou Medical University, Guiyang 550025, China
| | - Tuo Zhang
- Guizhou Provincial Key Laboratory of Pathogenesis and Drug Research on Common Chronic Diseases, Department of Physiology, College of Basic Medicine, Guizhou Medical University, Guiyang 550025, China
| | - Ting Zhao
- State Key Laboratory of Farm Animal Biotech Breeding, College of Biological Sciences, China Agricultural University, Beijing 100193, China
| | - Shaogang Qin
- State Key Laboratory of Farm Animal Biotech Breeding, College of Biological Sciences, China Agricultural University, Beijing 100193, China
| | - Meng Gao
- State Key Laboratory of Farm Animal Biotech Breeding, College of Biological Sciences, China Agricultural University, Beijing 100193, China
| | - Wenji Wang
- School of Life Sciences, Taizhou University, Taizhou 318000, China
| | - Wenying Zheng
- State Key Laboratory of Farm Animal Biotech Breeding, College of Biological Sciences, China Agricultural University, Beijing 100193, China
| | - Ziqi Chen
- State Key Laboratory of Farm Animal Biotech Breeding, College of Biological Sciences, China Agricultural University, Beijing 100193, China
| | - Longping Liu
- School of Life Sciences, Tsinghua University, Beijing 100084, China
| | - Ming Hao
- School of Life Sciences, Tsinghua University, Beijing 100084, China
| | - Bo Zhou
- State Key Laboratory of Farm Animal Biotech Breeding, College of Biological Sciences, China Agricultural University, Beijing 100193, China
| | - Hua Zhang
- State Key Laboratory of Farm Animal Biotech Breeding, College of Biological Sciences, China Agricultural University, Beijing 100193, China
| | - Jianbin Wang
- School of Life Sciences, Tsinghua University, Beijing 100084, China
| | - Fengchao Wang
- Transgenic Animal Center, National Institute of Biological Sciences, Beijing 102206, China.
| | - Guoliang Xia
- State Key Laboratory of Farm Animal Biotech Breeding, College of Biological Sciences, China Agricultural University, Beijing 100193, China; Key Laboratory of Ministry of Education for Conservation and Utilization of Special Biological Resources in the Western China, College of Life Science, Ningxia University, Yinchuan 750021, China.
| | - Chao Wang
- State Key Laboratory of Farm Animal Biotech Breeding, College of Biological Sciences, China Agricultural University, Beijing 100193, China.
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Perez RC, Yang X, Familari M, Martinez G, Lovicu FJ, Hime GR, de Iongh RU. TOB1 and TOB2 mark distinct RNA processing granules in differentiating lens fiber cells. J Mol Histol 2024; 55:121-138. [PMID: 38165569 DOI: 10.1007/s10735-023-10177-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/18/2023] [Accepted: 11/12/2023] [Indexed: 01/04/2024]
Abstract
Differentiation of lens fiber cells involves a complex interplay of signals from growth factors together with tightly regulated gene expression via transcriptional and post-transcriptional regulators. Various studies have demonstrated that RNA-binding proteins, functioning in ribonucleoprotein granules, have important roles in regulating post-transcriptional expression during lens development. In this study, we examined the expression and localization of two members of the BTG/TOB family of RNA-binding proteins, TOB1 and TOB2, in the developing lens and examined the phenotype of mice that lack Tob1. By RT-PCR, both Tob1 and Tob2 mRNA were detected in epithelial and fiber cells of embryonic and postnatal murine lenses. In situ hybridization showed Tob1 and Tob2 mRNA were most intensely expressed in the early differentiating fibers, with weaker expression in anterior epithelial cells, and both appeared to be downregulated in the germinative zone of E15.5 lenses. TOB1 protein was detected from E11.5 to E16.5 and was predominantly detected in large cytoplasmic puncta in early differentiating fiber cells, often co-localizing with the P-body marker, DCP2. Occasional nuclear puncta were also observed. By contrast, TOB2 was detected in a series of interconnected peri-nuclear granules, in later differentiating fiber cells of the inner cortex. TOB2 did not appear to co-localize with DCP2 but did partially co-localize with an early stress granule marker (EIF3B). These data suggest that TOB1 and TOB2 are involved with different aspects of the mRNA processing cycle in lens fiber cells. In vitro experiments using rat lens epithelial explants treated with or without a fiber differentiating dose of FGF2 showed that both TOB1 and TOB2 were up-regulated during FGF-induced differentiation. In differentiating explants, TOB1 also co-localized with DCP2 in large cytoplasmic granules. Analyses of Tob1-/- mice revealed relatively normal lens morphology but a subtle defect in cell cycle arrest of some cells at the equator and in the lens fiber mass of E13.5 embryos. Overall, these findings suggest that TOB proteins play distinct regulatory roles in RNA processing during lens fiber differentiation.
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Affiliation(s)
- Rafaela C Perez
- Ocular Development Laboratory, Anatomy & Physiology, University of Melbourne, Parkville, VIC, 3010, Australia
| | - Xenia Yang
- Ocular Development Laboratory, Anatomy & Physiology, University of Melbourne, Parkville, VIC, 3010, Australia
| | - Mary Familari
- School of Biosciences, University of Melbourne, Parkville, VIC, 3010, Australia
| | - Gemma Martinez
- Ocular Development Laboratory, Anatomy & Physiology, University of Melbourne, Parkville, VIC, 3010, Australia
| | - Frank J Lovicu
- Molecular and Cellular Biomedicine, School of Medical Sciences and Save Sight Institute, University of Sydney, Sydney, NSW, 2006, Australia
| | - Gary R Hime
- Stem Cell Genetics Laboratory, Anatomy & Physiology, University of Melbourne, Parkville, VIC, 3010, Australia
| | - Robb U de Iongh
- Ocular Development Laboratory, Anatomy & Physiology, University of Melbourne, Parkville, VIC, 3010, Australia.
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Gheyas R, Menko AS. Examining PI3K-signaling-dependent regulation of lens organelle free zone formation via immunolocalization and immunoblotting in chick embryos. STAR Protoc 2023; 4:102569. [PMID: 37713308 PMCID: PMC10509694 DOI: 10.1016/j.xpro.2023.102569] [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: 05/11/2023] [Revised: 07/17/2023] [Accepted: 08/21/2023] [Indexed: 09/17/2023] Open
Abstract
The elimination of lens organelles during development, required for mature lens function, is an autophagy-dependent mechanism induced through suppression of PI3K signaling. Here, we present a protocol for investigating the signaling pathways responsible for induction of the formation of this lens organelle free zone. We describe steps for preparation of lens organ culture and use of signaling pathway inhibitors. We then detail procedures for analyzing their impact using both confocal microscopy imaging of immunolabeled lens cryosections and immunoblot approaches. For complete details on the use and execution of this protocol, please refer to Gheyas et al. (2022).1.
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Affiliation(s)
- Rifah Gheyas
- Department of Pathology and Genomic Medicine, Thomas Jefferson University, Philadelphia, PA 19107, USA.
| | - A Sue Menko
- Department of Pathology and Genomic Medicine, Thomas Jefferson University, Philadelphia, PA 19107, USA.
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Brennan L, Disatham J, Menko AS, Kantorow M. Multiomic analysis implicates FOXO4 in genetic regulation of chick lens fiber cell differentiation. Dev Biol 2023; 504:25-37. [PMID: 37722500 PMCID: PMC10843493 DOI: 10.1016/j.ydbio.2023.09.005] [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: 05/15/2023] [Revised: 09/06/2023] [Accepted: 09/14/2023] [Indexed: 09/20/2023]
Abstract
A classic model for identification of novel differentiation mechanisms and pathways is the eye lens that consists of a monolayer of quiescent epithelial cells that are the progenitors of a core of mature fully differentiated fiber cells. The differentiation of lens epithelial cells into fiber cells follows a coordinated program involving cell cycle exit, expression of key structural proteins and the hallmark elimination of organelles to achieve transparency. Although multiple mechanisms and pathways have been identified to play key roles in lens differentiation, the entirety of mechanisms governing lens differentiation remain to be discovered. A previous study established that specific chromatin accessibility changes were directly associated with the expression of essential lens fiber cell genes, suggesting that the activity of transcription factors needed for expression of these genes could be regulated through binding access to the identified chromatin regions. Sequence analysis of the identified chromatin accessible regions revealed enhanced representation of the binding sequence for the transcription factor FOXO4 suggesting a direct role for FOXO4 in expression of these genes. FOXO4 is known to regulate a variety of cellular processes including cellular response to metabolic and oxidative stress, cell cycle withdrawal, and homeostasis, suggesting a previously unidentified role for FOXO4 in the regulation of lens cell differentiation. To further evaluate the role of FOXO4 we employed a multiomics approach to analyze the relationship between genome-wide FOXO4 binding, the differentiation-specific expression of key genes, and chromatin accessibility. To better identify active promoters and enhancers we also examined histone modification through analysis of H3K27ac. Specific methods included CUT&RUN (FOXO4 binding and H3K27ac modification), RNA-seq (differentiation state specific gene expression), and ATAC-seq (chromatin accessibility). CUT&RUN identified 20,966 FOXO4 binding sites and 33,921 H3K27ac marked regions across the lens fiber cell genome. RNA-seq identified 956 genes with significantly greater expression levels in fiber cells compared to epithelial cells (log2FC > 0.7, q < 0.05) and 2548 genes with significantly lower expression levels (log2FC < -0.7, q < 0.05). Integrated analysis identified 1727 differentiation-state specific genes that were nearest neighbors to at least one FOXO4 binding site, including genes encoding lens gap junctions (GJA1, GJA3), lens structural proteins (BFSP1, CRYBB1, ASL1), and genes required for lens transparency (HSF4, NRCAM). Multiomics analysis comparing the identified FOXO4 binding sites in published ATAC-seq data revealed that chromatin accessibility was associated with FOXO4-dependent gene expression during lens differentiation. The results provide evidence for an important requirement for FOXO4 in the regulated expression of key genes required for lens differentiation and link epigenetic regulation of chromatin accessibility and H3K27ac histone modification with the function of FOXO4 in controlling lens gene expression during lens fiber cell differentiation.
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Affiliation(s)
- Lisa Brennan
- Charles E. Schmidt College of Medicine, Florida Atlantic University, Boca Raton, FL, USA
| | - Joshua Disatham
- Charles E. Schmidt College of Medicine, Florida Atlantic University, Boca Raton, FL, USA
| | - A Sue Menko
- Department of Pathology and Genomic Medicine, Thomas Jefferson University, Philadelphia, PA, USA
| | - Marc Kantorow
- Charles E. Schmidt College of Medicine, Florida Atlantic University, Boca Raton, FL, USA.
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Gheyas R, Menko AS. The involvement of caspases in the process of nuclear removal during lens fiber cell differentiation. Cell Death Discov 2023; 9:386. [PMID: 37865680 PMCID: PMC10590423 DOI: 10.1038/s41420-023-01680-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/02/2023] [Revised: 09/27/2023] [Accepted: 10/11/2023] [Indexed: 10/23/2023] Open
Abstract
The terminal differentiation of lens fiber cells involves elimination of their organelles, which must occur while still maintaining their functionality throughout a lifetime. Removal of non-nuclear organelles is accomplished through induction of autophagy following the spatiotemporal suppression of the PI3K/Akt signaling axis. However, blocking this pathway is not alone sufficient to induce removal of fiber cell nuclei. While the final steps in fiber cell nuclear elimination are highlighted by the appearance of TUNEL-positive nuclei, which are associated with activation of the lens-specific DNaseIIβ, there are many steps in the process that precede the appearance of double stranded DNA breaks. We showed that this carefully regulated process, including the early changes in nuclear morphology resulting in nuclear condensation, cleavage of lamin B, and labeling by pH2AX, is reminiscent of the apoptotic process associated with caspase activation. Multiple caspases are known to be expressed and activated during lens cell differentiation. In this study, we investigated the link between two caspase downstream targets associated with apoptosis, ICAD, whose cleavage by caspase-3 leads to activation of CAD, a DNase that can create both single- and double-stranded DNA cleavages, and lamin B, a primary component of the nuclear lamina. We discovered that the specific inhibition of caspase-3 activation prevents both lamin B and DNA cleavage. Inhibiting caspase-3 did not prevent nuclear condensation or removal of the nuclear membrane. In contrast, a pan-caspase inhibitor effectively suppressed condensation of fiber cell nuclei during differentiation. These studies provide evidence that caspases play an important role in the process of removing fiber cell nuclei during lens differentiation.
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Affiliation(s)
- Rifah Gheyas
- Department of Pathology and Genomic Medicine, Sidney Kimmel Medical College, Thomas Jefferson University, Philadelphia, PA, US
| | - A Sue Menko
- Department of Pathology and Genomic Medicine, Sidney Kimmel Medical College, Thomas Jefferson University, Philadelphia, PA, US.
- Department of Ophthalmology, Sidney Kimmel Medical College, Thomas Jefferson University, Philadelphia, PA, US.
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Zhang Y, Liu C, Li Y, Xu H. Mechanism of the Mitogen-Activated Protein Kinases/Mammalian Target of Rapamycin Pathway in the Process of Cartilage Endplate Stem Cell Degeneration Induced by Tension Load. Global Spine J 2023; 13:2396-2408. [PMID: 35400210 PMCID: PMC10538332 DOI: 10.1177/21925682221085226] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Abstract
STUDY DESIGN Basic Research. OBJECTIVE Intervertebral disc degeneration (IVDD) is caused by the cartilage endplate (CEP). Cartilage endplate stem cell (CESC) is involved in the recovery of CEP degeneration. Tension load (TL) contributes a lot to the initiation and progression of IVDD. This study aims to investigate the regulatory mechanism of the Mitogen-activated protein kinases/Mammalian target of rapamycin (MAPK/mTOR) pathway during TL-induced CESC degeneration. METHODS CESCs were isolated from New Zealand big-eared white female rabbits (6 months old). FX-4000T cell stress loading system was applied to establish a TL-induced degeneration model of CESCs. Western blotting was used to detect the level of mTOR pathway-related proteins and autophagy markers LC3-Ⅱ, Beclin-1, and p62 in degenerative CESCs. The expression of MAPK pathway-related proteins JNK and extracellular signal-regulated kinases (ERK) in degenerated CESCs was inhibited by cell transfection to explore whether JNK and ERK play a regulatory role in TL-induced autophagy in CESCs. RESULTS In the CESC degeneration model, the mTOR pathway was activated. After inhibition of mTOR, the autophagy level of CESCs was increased, and the degeneration of CESCs was alleviated. The MAPK pathway was also activated in the CESC degeneration model. Inhibition of JNK expression may alleviate TL-induced CEP degeneration by inhibiting Raptor phosphorylation and activating autophagy. Inhibition of ERK expression may alleviate TL-induced CEP degeneration by inhibiting mTOR phosphorylation and activating autophagy. CONCLUSION Inhibition of JNK and ERK in the MAPK signaling family alleviated TL-induced CESC degeneration by inhibiting the phosphorylation of Raptor and mTOR in the mTOR pathway.
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Affiliation(s)
- Yu Zhang
- Spine Research Center of Wannan Medical College, Department of Spine Surgery, Yijishan Hospital, The First Affiliated Hospital of Wannan Medical College, Wuhu, P.R. China
| | - Chen Liu
- Spine Research Center of Wannan Medical College, Department of Spine Surgery, Yijishan Hospital, The First Affiliated Hospital of Wannan Medical College, Wuhu, P.R. China
| | - Yu Li
- Spine Research Center of Wannan Medical College, Department of Spine Surgery, Yijishan Hospital, The First Affiliated Hospital of Wannan Medical College, Wuhu, P.R. China
| | - Hongguang Xu
- Spine Research Center of Wannan Medical College, Department of Spine Surgery, Yijishan Hospital, The First Affiliated Hospital of Wannan Medical College, Wuhu, P.R. China
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Hong DE, Yu JE, Yoo SS, Yeo IJ, Son DJ, Yun J, Han SB, Hong JT. CHI3L1 induces autophagy through the JNK pathway in lung cancer cells. Sci Rep 2023; 13:9964. [PMID: 37340009 DOI: 10.1038/s41598-023-36844-4] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/25/2023] [Accepted: 06/11/2023] [Indexed: 06/22/2023] Open
Abstract
CHI3L1 is closely related to the molecular mechanisms of cancer cell migration, growth, and death. According to recent research, autophagy regulates tumor growth during various stages of cancer development. This study examined the association between CHI3L1 and autophagy in human lung cancer cells. In CHI3L1-overexpressing lung cancer cells, the expression of LC3, an autophagosome marker, and the accumulation of LC3 puncta increased. In contrast, CHI3L1 depletion in lung cancer cells decreased the formation of autophagosomes. Additionally, CHI3L1 overexpression promoted the formation of autophagosomes in various cancer cell lines: it also increased the co-localization of LC3 and the lysosome marker protein LAMP-1, indicating an increase in the production of autolysosomes. In mechanism study, CHI3L1 promotes autophagy via activation of JNK signaling. JNK may be crucial for CHI3L1-induced autophagy since pretreatment with the JNK inhibitor reduced the autophagic effect. Consistent with the in vitro model, the expression of autophagy-related proteins was downregulated in the tumor tissues of CHI3L1-knockout mice. Furthermore, the expression of autophagy-related proteins and CHI3L1 increased in lung cancer tissues compared with normal lung tissues. These findings show that CHI3L1-induced autophagy is triggered by JNK signals and that CHI3L1-induced autophagy could be a novel therapeutic approach to lung cancer.
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Affiliation(s)
- Da Eun Hong
- College of Pharmacy and Medical Research Center, Chungbuk National University, 194-31, Osongsaengmyeong 1-ro, Osong-eup, Cheongju-si, Chungbuk, 28160, Republic of Korea
| | - Ji Eun Yu
- College of Pharmacy and Medical Research Center, Chungbuk National University, 194-31, Osongsaengmyeong 1-ro, Osong-eup, Cheongju-si, Chungbuk, 28160, Republic of Korea
| | - Seung Sik Yoo
- College of Pharmacy and Medical Research Center, Chungbuk National University, 194-31, Osongsaengmyeong 1-ro, Osong-eup, Cheongju-si, Chungbuk, 28160, Republic of Korea
| | - In Jun Yeo
- College of Pharmacy and Medical Research Center, Chungbuk National University, 194-31, Osongsaengmyeong 1-ro, Osong-eup, Cheongju-si, Chungbuk, 28160, Republic of Korea
| | - Dong Ju Son
- College of Pharmacy and Medical Research Center, Chungbuk National University, 194-31, Osongsaengmyeong 1-ro, Osong-eup, Cheongju-si, Chungbuk, 28160, Republic of Korea
| | - Jaesuk Yun
- College of Pharmacy and Medical Research Center, Chungbuk National University, 194-31, Osongsaengmyeong 1-ro, Osong-eup, Cheongju-si, Chungbuk, 28160, Republic of Korea
| | - Sang-Bae Han
- College of Pharmacy and Medical Research Center, Chungbuk National University, 194-31, Osongsaengmyeong 1-ro, Osong-eup, Cheongju-si, Chungbuk, 28160, Republic of Korea.
| | - Jin Tae Hong
- College of Pharmacy and Medical Research Center, Chungbuk National University, 194-31, Osongsaengmyeong 1-ro, Osong-eup, Cheongju-si, Chungbuk, 28160, Republic of Korea.
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9
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Disatham J, Brennan L, Cvekl A, Kantorow M. Multiomics Analysis Reveals Novel Genetic Determinants for Lens Differentiation, Structure, and Transparency. Biomolecules 2023; 13:693. [PMID: 37189439 PMCID: PMC10136076 DOI: 10.3390/biom13040693] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/29/2023] [Revised: 04/13/2023] [Accepted: 04/16/2023] [Indexed: 05/17/2023] Open
Abstract
Recent advances in next-generation sequencing and data analysis have provided new gateways for identification of novel genome-wide genetic determinants governing tissue development and disease. These advances have revolutionized our understanding of cellular differentiation, homeostasis, and specialized function in multiple tissues. Bioinformatic and functional analysis of these genetic determinants and the pathways they regulate have provided a novel basis for the design of functional experiments to answer a wide range of long-sought biological questions. A well-characterized model for the application of these emerging technologies is the development and differentiation of the ocular lens and how individual pathways regulate lens morphogenesis, gene expression, transparency, and refraction. Recent applications of next-generation sequencing analysis on well-characterized chicken and mouse lens differentiation models using a variety of omics techniques including RNA-seq, ATAC-seq, whole-genome bisulfite sequencing (WGBS), chip-seq, and CUT&RUN have revealed a wide range of essential biological pathways and chromatin features governing lens structure and function. Multiomics integration of these data has established new gene functions and cellular processes essential for lens formation, homeostasis, and transparency including the identification of novel transcription control pathways, autophagy remodeling pathways, and signal transduction pathways, among others. This review summarizes recent omics technologies applied to the lens, methods for integrating multiomics data, and how these recent technologies have advanced our understanding ocular biology and function. The approach and analysis are relevant to identifying the features and functional requirements of more complex tissues and disease states.
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Affiliation(s)
- Joshua Disatham
- Charles E. Schmidt College of Medicine, Florida Atlantic University, Boca Raton, FL 33431, USA; (J.D.); (L.B.)
| | - Lisa Brennan
- Charles E. Schmidt College of Medicine, Florida Atlantic University, Boca Raton, FL 33431, USA; (J.D.); (L.B.)
| | - Ales Cvekl
- Departments of Ophthalmology and Visual Sciences and Genetics, Albert Einstein College of Medicine, Bronx, NY 10461, USA;
| | - Marc Kantorow
- Charles E. Schmidt College of Medicine, Florida Atlantic University, Boca Raton, FL 33431, USA; (J.D.); (L.B.)
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10
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Tarique I, Lu T, Tariq M. Cellular activity of autophagy and multivesicular bodies in lens fiber cells during early lens development in rbm24a mutant of zebrafish: Ultrastructure analysis. Micron 2023; 169:103446. [PMID: 36965272 DOI: 10.1016/j.micron.2023.103446] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/25/2023] [Revised: 03/16/2023] [Accepted: 03/16/2023] [Indexed: 03/27/2023]
Abstract
Use of zebrafish as animal model for various diseases during early developmental stages has been exponentially increased with the aim to achieve the best representative results in this transparent fish. Recent studies documented that Rbm24a mutant causes cataract formation and resulted in blindness using the zebrafish model. Therefore, correct interpretation of studies that aimed for molecular approaches, a description of comparative and in-depth analysis of development of lens in wildtype and mutant is crucial to obtain the correct conclusion. In this study, we use a gold standard method the Transmission Electron Microscopy (TEM) to analysis the lens development in rbm24a mutant zebrafish. Firstly, we compare the cellular structures at 16-20 h post fertilization (hpf), the lens placode in ectoderm indicated delay lens development in rbm24a mutant than wildtype (siblings) zebrafish. At 33 hpf, loosely appeared lens fiber cells showed heterogenous electron density with numbers of mitochondria in lens of rbm24a mutant, revealed the influence of gene mutation in lens development. A detail ultrastructure of lens of rbm24a mutant also presented at 33 hpf. Comparatively in wildtype (siblings) at 33 hpf, lens exhibited homogenous electron density in tightly packed lens fiber cells with few mitochondria. Furthermore, to characterize the lens in rbm24a mutant we obtained data of cellular structures on 25 hpf and 1.5 days' post fertilization (dpf). At 25 hpf in mutant zebrafish, the detached solid sphere lens mass from ectoderm showed karyorrhexis, mitophagy and vesicles (also multivesicular bodies), these cellular structures supposed to hamper the development of future fiber cells. Moreover, at 1.5 dpf in mutant, nuclear excisosome, multilamellar bodies and irregular shaped mitochondria in heterogenous electron dense cytoplasm of lens fiber cells, collectively shown affected lens transparency. In summary the ultrastructure results of lens of rbm24a mutant zebrafish expand our knowledge and give reflection of different cellular activities like autophagy, apoptosis, vesicles (multivesicular bodies) and nuclear excisosomes which play their role in transparency achievement.
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Affiliation(s)
- Imran Tarique
- Department of Healthcare Biotechnology, Atta Ur Rehman School of Applied Biosciences, National University of Science and Technology, Islamabad, Pakistan; Shandong Provincial Key Laboratory of Animal Cell and Developmental Biology, School of Life Sciences, Shandong University, Qingdao 266237, China.
| | - Tong Lu
- Shandong Provincial Key Laboratory of Animal Cell and Developmental Biology, School of Life Sciences, Shandong University, Qingdao 266237, China
| | - Mansoor Tariq
- Department of Veterinary Pathology, Faculty of Veterinary and Animal Sciences, Sindh Agriculture University, Tandojam 70060, Sindh, Pakistan
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11
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Li H, Gao L, Du J, Ma T, Li W, Ye Z, Li Z. Impacts of autophagy on the formation of organelle-free zone during the lens development. Mol Biol Rep 2023; 50:4551-4564. [PMID: 36877352 DOI: 10.1007/s11033-023-08323-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/29/2022] [Accepted: 02/02/2023] [Indexed: 03/07/2023]
Abstract
The thorough degeneration of organelles in the core of the lens is certainly a hallmark event during the lens development. Organelles degradation in the terminal differentiation process of lens fiber cells to form an organelle-free zone is critical for lens maturation and transparency. Several mechanisms have been proposed to expand our understanding of lens organelles degradation, including apoptotic pathways, the participation of ribozyme, proteolytic enzyme and phospholipase A and acyltransferase, and the newly discovered roles for autophagy. Autophagy is a lysosome-dependent degradation reaction during which the "useless" cellular components are degraded and recycled. These cellular components, such as incorrectly folded proteins, damaged organelles and other macromolecules, are first engulfed by the autophagosome before being further delivered to lysosomes for degradation. Although autophagy has been recognized involving in organelle degradation of the lens, the detailed functions remain to be discovered. Recent advances have revealed that autophagy not only plays a vital role in the intracellular quality control of the lens but is also involved in the degradation of nonnuclear organelles in the process of lens fiber cell differentiation. Herein, we first review the potential mechanisms of organelle-free zone formation, then discuss the roles of autophagy in intracellular quality control and cataract formation, and finally substantially summarize the potential involvement of autophagy in the development of organelle-free zone formation.
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Affiliation(s)
- Hongyu Li
- Medical School of Chinese PLA, Beijing, China.,Senior Department of Ophthalmology, the Third Medical Center of PLA General Hospital, Beijing, China
| | - Lixiong Gao
- Senior Department of Ophthalmology, the Third Medical Center of PLA General Hospital, Beijing, China
| | - Jinlin Du
- Medical School of Chinese PLA, Beijing, China.,Senior Department of Ophthalmology, the Third Medical Center of PLA General Hospital, Beijing, China
| | - Tianju Ma
- Senior Department of Ophthalmology, the Third Medical Center of PLA General Hospital, Beijing, China
| | - Wen Li
- Medical School of Chinese PLA, Beijing, China.,Senior Department of Ophthalmology, the Third Medical Center of PLA General Hospital, Beijing, China
| | - Zi Ye
- Senior Department of Ophthalmology, the Third Medical Center of PLA General Hospital, Beijing, China.
| | - Zhaohui Li
- Medical School of Chinese PLA, Beijing, China. .,Senior Department of Ophthalmology, the Third Medical Center of PLA General Hospital, Beijing, China.
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12
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Liton PB, Boesze-Battaglia K, Boulton ME, Boya P, Ferguson TA, Ganley IG, Kauppinnen A, Laurie GW, Mizushima N, Morishita H, Russo R, Sadda J, Shyam R, Sinha D, Thompson DA, Zacks DN. AUTOPHAGY IN THE EYE: FROM PHYSIOLOGY TO PATHOPHYSOLOGY. AUTOPHAGY REPORTS 2023; 2:2178996. [PMID: 37034386 PMCID: PMC10078619 DOI: 10.1080/27694127.2023.2178996] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/19/2022] [Accepted: 01/26/2023] [Indexed: 03/05/2023]
Abstract
Autophagy is a catabolic self-degradative pathway that promotes the degradation and recycling of intracellular material through the lysosomal compartment. Although first believed to function in conditions of nutritional stress, autophagy is emerging as a critical cellular pathway, involved in a variety of physiological and pathophysiological processes. Autophagy dysregulation is associated with an increasing number of diseases, including ocular diseases. On one hand, mutations in autophagy-related genes have been linked to cataracts, glaucoma, and corneal dystrophy; on the other hand, alterations in autophagy and lysosomal pathways are a common finding in essentially all diseases of the eye. Moreover, LC3-associated phagocytosis, a form of non-canonical autophagy, is critical in promoting visual cycle function. This review collects the latest understanding of autophagy in the context of the eye. We will review and discuss the respective roles of autophagy in the physiology and/or pathophysiology of each of the ocular tissues, its diurnal/circadian variation, as well as its involvement in diseases of the eye.
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Affiliation(s)
- Paloma B. Liton
- Departments of Ophthalmology & Pathology, Duke School of Medicine, Duke University, Durham, NC 27705, USA
| | - Kathleen Boesze-Battaglia
- Department of Basic and Translational Sciences, University of Pennsylvania, School of Dental Medicine, Philadelphia, PA 19104, USA
| | - Michael E. Boulton
- Department of Ophthalmology and Visual Sciences, University of Alabama at Birmingham (UAB), Birmingham, AL, USA
| | - Patricia Boya
- Department of Neuroscience and Movement Science. Faculty of Science and Medicine, University of Fribourg, 1700 Fribourg, Switzerland
| | - Thomas A. Ferguson
- Department of Ophthalmology and Visual Sciences, Washington University in St. Louis, St. Louis, MO 63110, USA
| | - Ian G. Ganley
- MRC Protein Phosphorylation and Ubiquitylation Unit, School of Life Sciences, University of Dundee, Dundee, DD1 5EH, UK
| | - Anu Kauppinnen
- Faculty of Health and Sciences, School of Pharmacy, University of Eastern Finland, 70210 Kuopio, Finland
| | - Gordon W. Laurie
- Departments of Cell Biology, Ophthalmology and Biomedical Engineering, University of Virginia, Charlottesville, VA 22908, USA
| | - Noboru Mizushima
- Department of Biochemistry and Molecular Biology, Graduate School of Medicine, The University of Tokyo, 113-0033, Japan
| | - Hideaki Morishita
- Department of Biochemistry and Molecular Biology, Graduate School of Medicine, The University of Tokyo, 113-0033, Japan
- Department of Physiology, Juntendo University Graduate School of Medicine, Bunkyo-ku, Tokyo, 113-8421, Japan
| | - Rossella Russo
- Preclinical and Translational Pharmacology, Glaucoma Unit, Department of Pharmacy, Health and Nutritional Sciences, University of Calabria, 87036 Rende, Italy
| | - Jaya Sadda
- Department of Ophthalmology and Visual Sciences, Kellogg Eye Center, University of Michigan Medical School, Ann Arbor, MI, USA
| | | | - Debasish Sinha
- Department of Ophthalmology, Cell Biology, and Developmental Biology, University of Pittsburgh School of Medicine, Pittsburgh, PA, USA
- Wilmer Eye Institute, The Johns Hopkins University School of Medicine, Baltimore, MD, USA
| | - Debra A. Thompson
- Department of Ophthalmology and Visual Sciences, Kellogg Eye Center, University of Michigan Medical School, Ann Arbor, MI, USA
| | - David N. Zacks
- Department of Ophthalmology and Visual Sciences, Kellogg Eye Center, University of Michigan Medical School, Ann Arbor, MI, USA
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Brennan L, Costello MJ, Hejtmancik JF, Menko AS, Riazuddin SA, Shiels A, Kantorow M. Autophagy Requirements for Eye Lens Differentiation and Transparency. Cells 2023; 12:475. [PMID: 36766820 PMCID: PMC9914699 DOI: 10.3390/cells12030475] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2022] [Revised: 01/17/2023] [Accepted: 01/25/2023] [Indexed: 02/05/2023] Open
Abstract
Recent evidence points to autophagy as an essential cellular requirement for achieving the mature structure, homeostasis, and transparency of the lens. Collective evidence from multiple laboratories using chick, mouse, primate, and human model systems provides evidence that classic autophagy structures, ranging from double-membrane autophagosomes to single-membrane autolysosomes, are found throughout the lens in both undifferentiated lens epithelial cells and maturing lens fiber cells. Recently, key autophagy signaling pathways have been identified to initiate critical steps in the lens differentiation program, including the elimination of organelles to form the core lens organelle-free zone. Other recent studies using ex vivo lens culture demonstrate that the low oxygen environment of the lens drives HIF1a-induced autophagy via upregulation of essential mitophagy components to direct the specific elimination of the mitochondria, endoplasmic reticulum, and Golgi apparatus during lens fiber cell differentiation. Pioneering studies on the structural requirements for the elimination of nuclei during lens differentiation reveal the presence of an entirely novel structure associated with degrading lens nuclei termed the nuclear excisosome. Considerable evidence also indicates that autophagy is a requirement for lens homeostasis, differentiation, and transparency, since the mutation of key autophagy proteins results in human cataract formation.
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Affiliation(s)
- Lisa Brennan
- Department of Biomedical Science, Schmidt College of Medicine, Florida Atlantic University, Boca Raton, FL 33460, USA
| | - M. Joseph Costello
- Department of Cell Biology and Physiology, University of North Carolina, Chapel Hill, NC 27599, USA
| | - J. Fielding Hejtmancik
- Ophthalmic Genetics and Visual Function Branch, National Eye Institute, National Institutes of Health, Bethesda, MD 20892, USA
| | - A. Sue Menko
- Department of Pathology, Anatomy and Cell Biology, Sidney Kimmel Medical College, Thomas Jefferson University, Philadelphia, PA 19107, USA
- Department of Ophthalmology, Sidney Kimmel Medical College, Thomas Jefferson University, Philadelphia, PA 19107, USA
| | - S. Amer Riazuddin
- The Wilmer Eye Institute, Johns Hopkins University School of Medicine, Baltimore, MD 21287, USA
| | - Alan Shiels
- Department of Ophthalmology and Visual Sciences, Washington University School of Medicine, St. Louis, MO 63110, USA
| | - Marc Kantorow
- Department of Biomedical Science, Schmidt College of Medicine, Florida Atlantic University, Boca Raton, FL 33460, USA
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14
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Taylor A, Gu Y, Chang ML, Yang W, Francisco S, Rowan S, Bejarano E, Pruitt S, Zhu L, Weiss G, Brennan L, Kantorow M, Whitcomb EA. Repurposing a Cyclin-Dependent Kinase 1 (CDK1) Mitotic Regulatory Network to Complete Terminal Differentiation in Lens Fiber Cells. Invest Ophthalmol Vis Sci 2023; 64:6. [PMID: 36734965 PMCID: PMC9907369 DOI: 10.1167/iovs.64.2.6] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/29/2022] [Accepted: 11/22/2022] [Indexed: 02/04/2023] Open
Abstract
Purpose During lens fiber cell differentiation, organelles are removed in an ordered manner to ensure lens clarity. A critical step in this process is removal of the cell nucleus, but the mechanisms by which this occurs are unclear. In this study, we investigate the role of a cyclin-dependent kinase 1 (CDK1) regulatory loop in controlling lens fiber cell denucleation (LFCD). Methods We examined lens differentiation histologically in two different vertebrate models. An embryonic chick lens culture system was used to test the role of CDK1, cell division cycle 25 (CDC25), WEE1, and PP2A in LFCD. Additionally, we used three mouse models that express high levels of the CDK inhibitor p27 to test whether increased p27 levels affect LFCD. Results Using chick lens organ cultures, small-molecule inhibitors of CDK1 and CDC25 inhibit LFCD, while inhibiting the CDK1 inhibitory kinase WEE1 potentiates LFCD. Additionally, treatment with an inhibitor of PP2A, which indirectly inhibits CDK1 activity, also increased LFCD. Three different mouse models that express increased levels of p27 through different mechanisms show impaired LFCD. Conclusions Here we define a conserved nonmitotic role for CDK1 and its upstream regulators in controlling LFCD. We find that CDK1 functionally interacts with WEE1, a nuclear kinase that inhibits CDK1 activity, and CDC25 activating phosphatases in cells where CDK1 activity must be exquisitely regulated to allow for LFCD. We also provide genetic evidence in multiple in vivo models that p27, a CDK1 inhibitor, inhibits lens growth and LFCD.
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Affiliation(s)
- Allen Taylor
- Laboratory for Nutrition and Vision Research, USDA Human Nutrition Research Center on Aging, Tufts University, Boston, Massachusetts, United States
- Department of Ophthalmology, Tufts University School of Medicine, Boston, Massachusetts, United States
| | - Yumei Gu
- Laboratory for Nutrition and Vision Research, USDA Human Nutrition Research Center on Aging, Tufts University, Boston, Massachusetts, United States
| | - Min-Lee Chang
- Laboratory for Nutrition and Vision Research, USDA Human Nutrition Research Center on Aging, Tufts University, Boston, Massachusetts, United States
| | - Wenxin Yang
- Laboratory for Nutrition and Vision Research, USDA Human Nutrition Research Center on Aging, Tufts University, Boston, Massachusetts, United States
| | - Sarah Francisco
- Laboratory for Nutrition and Vision Research, USDA Human Nutrition Research Center on Aging, Tufts University, Boston, Massachusetts, United States
| | - Sheldon Rowan
- Laboratory for Nutrition and Vision Research, USDA Human Nutrition Research Center on Aging, Tufts University, Boston, Massachusetts, United States
- Department of Ophthalmology, Tufts University School of Medicine, Boston, Massachusetts, United States
| | - Eloy Bejarano
- Laboratory for Nutrition and Vision Research, USDA Human Nutrition Research Center on Aging, Tufts University, Boston, Massachusetts, United States
| | - Steven Pruitt
- Roswell Park Cancer Institute, Buffalo, New York, United States
| | - Liang Zhu
- Albert Einstein College of Medicine, New York City, New York, United States
| | - Grant Weiss
- Department of Neuroscience Tufts University School of Medicine, Boston, Massachusetts, United States
| | - Lisa Brennan
- Florida Atlantic University, Boca Raton, Florida, United States
| | - Marc Kantorow
- Florida Atlantic University, Boca Raton, Florida, United States
| | - Elizabeth A. Whitcomb
- Laboratory for Nutrition and Vision Research, USDA Human Nutrition Research Center on Aging, Tufts University, Boston, Massachusetts, United States
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15
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Cui X, Chen F, Zhao J, Li D, Hu M, Chen X, Zhang Y, Han L. Involvement of JNK signaling in Aspergillus fumigatus-induced inflammatory factors release in bronchial epithelial cells. Sci Rep 2023; 13:1293. [PMID: 36690696 PMCID: PMC9871034 DOI: 10.1038/s41598-023-28567-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/13/2022] [Accepted: 01/20/2023] [Indexed: 01/25/2023] Open
Abstract
Aspergillus fumigatus (A. fumigatus) is an important fungal pathogen and its conidia can be inhaled and interact with airway epithelial cells; however, the release of inflammatory factors from bronchial epithelial cells upon A. fumigatus infection and its regulation remained unclear. Here it was demonstrated that the release of IL-27, MCP-1 and TNF-α from BEAS-2B cells were upregulated upon stimulation by conidia, while mitogen-activated protein kinase signaling pathway was activated. Further, the inhibition of JNK, but not p38 and ERK, could inhibit inflammatory factors release and the LC3II formation in BEAS-2B cells induced by A. fumigatus conidia. In addition, an inhibitor of autophagy, bafilomycin A1 was able to significantly down-regulate the release of inflammatory factors in BEAS-2B cells upon A. fumigatus conidia, while rapamycin could reverse the effect of JNK inhibitor on IL-27 and TNF-α release. Taken together, these data demonstrated that JNK signal might play an important role in inflammatory factor release regulated by autophagy in bronchial epithelial cells against A. fumigatus infection.
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Affiliation(s)
- Xiao Cui
- Department of Respiratory and Critical Care Medicine, Beijing Youan Hospital, Capital Medical University, Beijing, 100069, China
| | - Fangyan Chen
- Department for Disinfection and Infection Control, Chinese PLA Center for Disease Control and Prevention, Beijing, China
| | - Jingya Zhao
- Department for Disinfection and Infection Control, Chinese PLA Center for Disease Control and Prevention, Beijing, China
| | - Dingchen Li
- Department for Disinfection and Infection Control, Chinese PLA Center for Disease Control and Prevention, Beijing, China
| | - Mandong Hu
- National Center of Biomedical Analysis, 27 Taiping Lu, Beijing, 100850, China
| | - Xue Chen
- Department of Respiratory and Critical Care Medicine, Beijing Youan Hospital, Capital Medical University, Beijing, 100069, China
| | - Yulin Zhang
- Department of Respiratory and Critical Care Medicine, Beijing Youan Hospital, Capital Medical University, Beijing, 100069, China.
| | - Li Han
- Department for Disinfection and Infection Control, Chinese PLA Center for Disease Control and Prevention, Beijing, China.
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16
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Bahamondes Lorca VA, Wu S. Ultraviolet Light, Unfolded Protein Response and Autophagy †. Photochem Photobiol 2023; 99:498-508. [PMID: 36591940 DOI: 10.1111/php.13777] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/01/2022] [Accepted: 12/22/2022] [Indexed: 01/03/2023]
Abstract
The endoplasmic reticulum (ER) plays an important role in the regulation of protein synthesis. Alterations in the folding capacity of the ER induce stress, which activates three ER sensors that mediate the unfolded protein response (UPR). Components of the pathways regulated by these sensors have been shown to regulate autophagy. The last corresponds to a mechanism of self-eating and recycling important for proper cell maintenance. Ultraviolet radiation (UV) is an external damaging stimulus that is known for inducing oxidative stress, and DNA, lipid and protein damage. Many controversies exist regarding the role of UV-inducing ER stress or autophagy. However, a connection between the three of them has not been addressed. In this review, we will discuss the contradictory theories regarding the relationships between UV radiation with the induction of ER stress and autophagy, as well as hypothetic connections between UV, ER stress and autophagy.
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Affiliation(s)
- Verónica A Bahamondes Lorca
- Edison Biotechnology Institute, Ohio University, Athens, OH.,Departamento de Tecnología Médica, Facultad de Medicina, Universidad de Chile, Santiago, Chile
| | - Shiyong Wu
- Edison Biotechnology Institute, Ohio University, Athens, OH.,Department of Chemistry and Biochemistry, Ohio University, Athens, OH
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17
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Wei Z, Hao C, Chen JK, Gan L, Fan X. A tamoxifen-inducible Cre knock-in mouse for lens-specific gene manipulation. Exp Eye Res 2023; 226:109306. [PMID: 36372215 PMCID: PMC9839650 DOI: 10.1016/j.exer.2022.109306] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/27/2022] [Revised: 11/02/2022] [Accepted: 11/04/2022] [Indexed: 11/13/2022]
Abstract
Mouse models are valuable tools in studying lens biology and biochemistry, and the Cre-loxP system is the most used technology for gene targeting in the lens. However, numerous genes are indispensable in lens development. The conventional knockout method either prevents lens formation or causes simultaneous cataract formation, hindering the studies of their roles in lens structure, growth, metabolism, and cataractogenesis during lens aging. An inducible Cre-loxP mouse line is an excellent way to achieve such a purpose. We established a lens-specific Cre ERT2 knock-in mouse (LCEK), an inducible mouse model for lens-specific gene targeting in a spatiotemporal manner. LCEK mice were created by in-frame infusion of a P2A-CreERT2 at the C-terminus of the last coding exon of the gene alpha A crystallin (Cryaa). LCEK mice express tamoxifen-inducible Cre recombinase uniquely in the lens. Through ROSAmT/mG and two endogenous genes (Gclc and Rbpj) targeting, we found no Cre recombinase leakage in the lens epithelium, but 50-80% leakage was observed in the lens cortex and nucleus. Administration of tamoxifen almost completely abolished target gene expression in both lens epithelium and cortex but only mildly enhanced gene deletion in the lens nucleus. Notably, no overt leakage of Cre activity was detected in developing LCEK lens when bred with mice carrying loxP floxed genes that are essential for lens development. This newly generated LCEK line will be a powerful tool to target genes in the lens for gene functions study in lens aging, posterior capsule opacification (PCO), and other areas requiring precision gene targeting.
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Affiliation(s)
- Zongbo Wei
- Department of Cellular Biology and Anatomy, Medical College of Georgia at Augusta University, Augusta, GA, USA
| | - Caili Hao
- Department of Cellular Biology and Anatomy, Medical College of Georgia at Augusta University, Augusta, GA, USA
| | - Jian-Kang Chen
- Department of Cellular Biology and Anatomy, Medical College of Georgia at Augusta University, Augusta, GA, USA
| | - Lin Gan
- Department of Neuroscience & Regenerative Medicine, Medical College of Georgia at Augusta University, Augusta, GA, USA
| | - Xingjun Fan
- Department of Cellular Biology and Anatomy, Medical College of Georgia at Augusta University, Augusta, GA, USA.
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18
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Ma J, Ye W, Yang Y, Wu T, Wang Y, Li J, Pei R, He M, Zhang L, Zhou J. The interaction between autophagy and the epithelial-mesenchymal transition mediated by NICD/ULK1 is involved in the formation of diabetic cataracts. Mol Med 2022; 28:116. [PMID: 36104669 PMCID: PMC9476327 DOI: 10.1186/s10020-022-00540-2] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/07/2022] [Accepted: 09/02/2022] [Indexed: 11/10/2022] Open
Abstract
Abstract
Background
Cataracts are the leading cause of blindness and a common ocular complication of diabetes. The epithelial-mesenchymal transition (EMT) of lens epithelial cells (LECs) and altered autophagic activity occur during the development of diabetic cataracts. The disturbed interaction of autophagy with EMT in LECs stimulated by high glucose levels may participate in cataract formation.
Methods
A rat diabetic cataract model induced by streptozotocin (STZ) and human lens epithelial cells (HLE-B3) stimulated with a high glucose concentration were employed in the study. These models were treated with rapamycin (an inhibitor of mammalian target of rapamycin (mTOR)), and N-(N-[3,5-difluorophenacetyl]-1-alanyl)-S-phenylglycine t-butyl ester (DAPT, an inhibitor of γ-secretase) alone or in combination. Lens opacity was observed and photographed under a slit-lamp microscope. Histological changes in paraffin sections of lenses were detected under a light microscope after hematoxylin and eosin staining. Alterations of autophagosomes in LECs were counted and evaluated under a transmission electron microscope. The expression levels of proteins involved in the EMT, autophagy, and the signaling pathways in LECs were measured using Western blotting and immunofluorescence staining. Cell migration was determined by performing transwell and scratch wound assays. Coimmunoprecipitation (Co-IP) was performed to verify protein-protein interactions. Proteins were overexpressed in transfected cells to confirm their roles in the signaling pathways of interest.
Results
In LECs, a high glucose concentration induces the EMT by activating Jagged1/Notch1/Notch intracellular domain (NICD)/Snail signaling and inhibits autophagy through the AKT/mTOR/unc 51-like kinase 1 (ULK1) signaling pathway in vivo and in vitro, resulting in diabetic cataracts. Enhanced autophagic activity induced by rapamycin suppressed the EMT by inducing Notch1 degradation by SQSTM1/p62 and microtubule-associated protein light chain 3 (LC3) in LECs, while inhibition of the Notch signaling pathway with DAPT not only prevented the EMT but also activated autophagy by decreasing the levels of NICD, which bound to ULK1, phosphorylated it, and then inhibited the initiation of autophagy.
Conclusions
We describe a new interaction of autophagy and the EMT involving NICD/ULK1 signaling, which mediates crosstalk between these two important events in the formation of diabetic cataracts. Activating autophagy and suppressing the EMT mutually promote each other, revealing a potential target and strategy for the prevention of diabetic cataracts.
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Li J, Tan X, Sun Q, Li X, Chen R, Luo L. Deficiency of Jamc Leads to Congenital Nuclear Cataract and Activates the Unfolded Protein Response in Mouse Lenses. Invest Ophthalmol Vis Sci 2022; 63:1. [PMID: 36048019 PMCID: PMC9440611 DOI: 10.1167/iovs.63.10.1] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022] Open
Abstract
Purpose The malfunction of junctional adhesion molecule C (JAM-C) has been reported to induce congenital cataract in humans and mice; however, specific characters and the mechanism of this cataract are still unclear. This study aimed to characterize abnormal lens development in Jamc knockout mice and clarify the underlying mechanism. Methods Jamc knockout mice backcrossed onto the C57BL/6 genetic background were used for this research. Slit-lamp and darkfield images showed the cataract phenotype of Jamc−/− mice. Hematoxylin and eosin staining was performed to visualize the morphological and histological features. RNA sequencing was applied to detect differentially expressed genes. Quantitative RT-PCR, western blot, and immunofluorescence were used to determine the level of unfolded protein response (UPR)-related genes. TUNEL staining was utilized to label cell death. Results Jamc knockout mice exhibited nuclear cataract with abnormal lens morphology and defective degradation of nuclei and organelles in lens fiber cells. Compared with wild-type control mice, the expression level of BiP, CHOP, TRIB3, and CHAC1, genes involved in endoplasmic reticulum stress and the UPR, were highly upregulated in Jamc−/− lenses, suggesting that abnormal lens development was accompanied by UPR activation. Moreover, increased cell death was also found in Jamc−/− lenses. Conclusions Congenital nuclear cataract caused by Jamc deficiency is accompanied by defective degradation of nuclei and organelles in lens fiber cells, lens structure disorder, and UPR activation, suggesting that JAM-C is required for maintaining normal lens development and that UPR activation is involved in cataract formation in Jamc-deficient lenses.
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Affiliation(s)
- Jiani Li
- State Key Laboratory of Ophthalmology, Zhongshan Ophthalmic Center, Sun Yat-sen University, Guangdong Provincial Key Laboratory of Ophthalmology and Visual Science, Guangzhou, China
| | - Xuhua Tan
- State Key Laboratory of Ophthalmology, Zhongshan Ophthalmic Center, Sun Yat-sen University, Guangdong Provincial Key Laboratory of Ophthalmology and Visual Science, Guangzhou, China
| | - Qihang Sun
- State Key Laboratory of Ophthalmology, Zhongshan Ophthalmic Center, Sun Yat-sen University, Guangdong Provincial Key Laboratory of Ophthalmology and Visual Science, Guangzhou, China
| | - Xuri Li
- State Key Laboratory of Ophthalmology, Zhongshan Ophthalmic Center, Sun Yat-sen University, Guangdong Provincial Key Laboratory of Ophthalmology and Visual Science, Guangzhou, China
| | - Rongyuan Chen
- State Key Laboratory of Ophthalmology, Zhongshan Ophthalmic Center, Sun Yat-sen University, Guangdong Provincial Key Laboratory of Ophthalmology and Visual Science, Guangzhou, China
| | - Lixia Luo
- State Key Laboratory of Ophthalmology, Zhongshan Ophthalmic Center, Sun Yat-sen University, Guangdong Provincial Key Laboratory of Ophthalmology and Visual Science, Guangzhou, China
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21
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Khan SY, Ali M, Kabir F, Na CH, Delannoy M, Ma Y, Qiu C, Costello MJ, Hejtmancik JF, Riazuddin SA. The role of FYCO1-dependent autophagy in lens fiber cell differentiation. Autophagy 2022; 18:2198-2215. [PMID: 35343376 PMCID: PMC9397473 DOI: 10.1080/15548627.2022.2025570] [Citation(s) in RCA: 9] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/24/2020] [Revised: 12/27/2021] [Accepted: 12/31/2021] [Indexed: 11/02/2022] Open
Abstract
FYCO1 (FYVE and coiled-coil domain containing 1) is an adaptor protein, expressed ubiquitously and required for microtubule-dependent, plus-end-directed transport of macroautophagic/autophagic vesicles. We have previously shown that loss-of-function mutations in FYCO1 cause cataracts with no other ocular and/or extra-ocular phenotype. Here, we show fyco1 homozygous knockout (fyco1-/-) mice recapitulate the cataract phenotype consistent with a critical role of FYCO1 and autophagy in lens morphogenesis. Transcriptome coupled with proteome and metabolome profiling identified many autophagy-associated genes, proteins, and lipids respectively perturbed in fyco1-/- mice lenses. Flow cytometry of FYCO1 (c.2206C>T) knock-in (KI) human lens epithelial cells revealed a decrease in autophagic flux and autophagic vesicles resulting from the loss of FYCO1. Transmission electron microscopy showed cellular organelles accumulated in FYCO1 (c.2206C>T) KI lens-like organoid structures and in fyco1-/- mice lenses. In summary, our data confirm the loss of FYCO1 function results in a diminished autophagic flux, impaired organelle removal, and cataractogenesis.Abbreviations: CC: congenital cataracts; DE: differentially expressed; ER: endoplasmic reticulum; FYCO1: FYVE and coiled-coil domain containing 1; hESC: human embryonic stem cell; KI: knock-in; OFZ: organelle-free zone; qRT-PCR: quantitative real-time PCR; PE: phosphatidylethanolamine; RNA-Seq: RNA sequencing; SD: standard deviation; sgRNA: single guide RNA; shRNA: shorthairpin RNA; TEM: transmission electron microscopy; WT: wild type.
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Affiliation(s)
- Shahid Y. Khan
- The Wilmer Eye Institute, Johns Hopkins University School of Medicine, Baltimore, MD, USA
| | - Muhammad Ali
- The Wilmer Eye Institute, Johns Hopkins University School of Medicine, Baltimore, MD, USA
| | - Firoz Kabir
- The Wilmer Eye Institute, Johns Hopkins University School of Medicine, Baltimore, MD, USA
| | - Chan Hyun Na
- Department of Neurology, Institute for Cell Engineering, Johns Hopkins University School of Medicine, Baltimore, MD, USA
| | - Michael Delannoy
- Department of Cell Biology and Imaging Facility, Johns Hopkins University School of Medicine, Baltimore, MD, USA
| | - Yinghong Ma
- Yale Stem Cell Center, Yale University School of Medicine, New Haven, CT, USA
| | - Caihong Qiu
- Yale Stem Cell Center, Yale University School of Medicine, New Haven, CT, USA
| | - M. Joseph Costello
- Department of Cell Biology and Physiology, University of North Carolina, Chapel Hill, NC, USA
| | - J. Fielding Hejtmancik
- Ophthalmic Genetics and Visual Function Branch, National Eye Institute, National Institutes of Health, Bethesda, MD, USA
| | - S. Amer Riazuddin
- The Wilmer Eye Institute, Johns Hopkins University School of Medicine, Baltimore, MD, USA
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22
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Qin M, Xie Z, Cao T, Wang Z, Zhang X, Wang F, Wei W, Jin M, Ma J, Zeng L, Wang Y, Pei S, Zhang X. Autophagy in Rat Müller Glial Cells Is Modulated by the Sirtuin 4/AMPK/mTOR Pathway and Induces Apoptosis under Oxidative Stress. Cells 2022; 11:cells11172645. [PMID: 36078054 PMCID: PMC9454555 DOI: 10.3390/cells11172645] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/18/2022] [Revised: 08/14/2022] [Accepted: 08/18/2022] [Indexed: 11/30/2022] Open
Abstract
Müller glial cells (MGCs) are a group of glial cells in the retina that provide essential support to retinal neurons; however, the understanding of MGC apoptosis and autophagy remains limited. This study was aimed at investigating the role of autophagy in MGCs under normal and oxidative conditions, and identifying the underlying mechanisms. In addition, the sirtuin 4 (SIRT4)-mediated signaling pathway was observed to regulate the autophagic process in MGCs. To assess the effect of autophagy on MGC mitochondrial function and survival, we treated rMC-1 cells—rat-derived Müller glial cells—with rapamycin and 3-methyladenine (3-MA), and found that MGC death was not induced by such treatment, while autophagic dysfunction could increase MGC apoptosis under oxidative stress, as reflected by the expression level of cleaved caspase 3 and PI staining. In addition, the downregulation of autophagy by 3-MA could influence the morphology of the mitochondrial network structure, the mitochondrial membrane potential, and generation of reactive oxygen species (ROS) under oxidative stress. Moreover, SIRT4 depletion enhanced autophagosome formation, as verified by an increase in the LC3 II/I ratio and a decrease in the expression of SQSTM1/p62, and vice versa. The inhibition of AMPK phosphorylation by compound C could reverse these changes in LC3 II/I and SQSTM1/p62 caused by SIRT4 knockdown. Our research concludes that MGCs can endure autophagic dysfunction in the absence of oxidative stress, while the downregulation of autophagy can cause MGCs to become more sensitized to oxidative stress. Simultaneous exposure to oxidative stress and autophagic dysfunction in MGCs can result in a pronounced impairment of cell survival. Mechanically, SIRT4 depletion can activate the autophagic process in MGCs by regulating the AMPK–mTOR signaling pathway.
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Affiliation(s)
- Mengqi Qin
- Jiangxi Provincial Key Laboratory for Ophthalmology, Jiangxi Clinical Research Center of Ophthalmic Disease, Affiliated Eye Hospital of Nanchang University, Nanchang 330006, China
| | - Zhi Xie
- Jiangxi Provincial Key Laboratory for Ophthalmology, Jiangxi Clinical Research Center of Ophthalmic Disease, Affiliated Eye Hospital of Nanchang University, Nanchang 330006, China
| | - Ting Cao
- Jiangxi Provincial Key Laboratory for Ophthalmology, Jiangxi Clinical Research Center of Ophthalmic Disease, Affiliated Eye Hospital of Nanchang University, Nanchang 330006, China
| | - Zhiruo Wang
- Jiangxi Provincial Key Laboratory for Ophthalmology, Jiangxi Clinical Research Center of Ophthalmic Disease, Affiliated Eye Hospital of Nanchang University, Nanchang 330006, China
| | - Xiaoyu Zhang
- Jiangxi Provincial Key Laboratory for Ophthalmology, Jiangxi Clinical Research Center of Ophthalmic Disease, Affiliated Eye Hospital of Nanchang University, Nanchang 330006, China
| | - Feifei Wang
- Jiangxi Provincial Key Laboratory for Ophthalmology, Jiangxi Clinical Research Center of Ophthalmic Disease, Affiliated Eye Hospital of Nanchang University, Nanchang 330006, China
| | - Wei Wei
- Jiangxi Provincial Key Laboratory for Ophthalmology, Jiangxi Clinical Research Center of Ophthalmic Disease, Affiliated Eye Hospital of Nanchang University, Nanchang 330006, China
| | - Ming Jin
- Jiangxi Provincial Key Laboratory for Ophthalmology, Jiangxi Clinical Research Center of Ophthalmic Disease, Affiliated Eye Hospital of Nanchang University, Nanchang 330006, China
| | - Jingyuan Ma
- Jiangxi Provincial Key Laboratory for Ophthalmology, Jiangxi Clinical Research Center of Ophthalmic Disease, Affiliated Eye Hospital of Nanchang University, Nanchang 330006, China
- Queen Mary School, Nanchang University, Nanchang 330006, China
| | - Ling Zeng
- Jiangxi Provincial Key Laboratory for Ophthalmology, Jiangxi Clinical Research Center of Ophthalmic Disease, Affiliated Eye Hospital of Nanchang University, Nanchang 330006, China
| | - Yanan Wang
- Jiangxi Provincial Key Laboratory for Ophthalmology, Jiangxi Clinical Research Center of Ophthalmic Disease, Affiliated Eye Hospital of Nanchang University, Nanchang 330006, China
| | - Shaonan Pei
- Jiangxi Provincial Key Laboratory for Ophthalmology, Jiangxi Clinical Research Center of Ophthalmic Disease, Affiliated Eye Hospital of Nanchang University, Nanchang 330006, China
| | - Xu Zhang
- Jiangxi Provincial Key Laboratory for Ophthalmology, Jiangxi Clinical Research Center of Ophthalmic Disease, Affiliated Eye Hospital of Nanchang University, Nanchang 330006, China
- Correspondence:
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23
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Gletten RB, Cantrell LS, Bhattacharya S, Schey KL. Lens Aquaporin-5 Inserts Into Bovine Fiber Cell Plasma Membranes Via Unconventional Protein Secretion. Invest Ophthalmol Vis Sci 2022; 63:5. [PMID: 35816045 PMCID: PMC9284464 DOI: 10.1167/iovs.63.8.5] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022] Open
Abstract
Purpose To spatially map aquaporin-5 (AQP5) expression in the bovine lens, molecularly characterize cytoplasmic AQP5-containing vesicles in the outer cortex, and elucidate AQP5 membrane trafficking mechanisms. Methods Immunofluorescence was performed on bovine lens cryosections using AQP5, TOMM20, COX IV, calnexin, LC3B, Sec22β, LIMP-2, and connexin 50 antibodies and the membrane dye CM-DiI. AQP5 plasma membrane insertion was defined via line expression profile analysis. Transmission electron microscopy (TEM) was performed on bovine lens sections to examine cytoplasmic organelle morphology and subcellular localization in cortical fiber cells. Bovine lenses were treated with 10-nM bafilomycin A1 or 0.1% dimethyl sulfoxide vehicle control for 24 hours in ex vivo culture to determine changes in AQP5 plasma membrane expression. Results Immunofluorescence analysis revealed cytoplasmic AQP5 expression in lens epithelial cells and differentiating fiber cells. In the lens cortex, complete AQP5 plasma membrane insertion occurs at r/a = 0.951 ± 0.005. AQP5-containing cytoplasmic vesicles are spheroidal in morphology with linear extensions, express TOMM20, and contain LC3B and LIMP-2, but not Sec22β, as fiber cells mature. TEM analysis revealed complex vesicular assemblies with congruent subcellular localization to AQP5-containing cytoplasmic vesicles. AQP5-containing cytoplasmic vesicles appear to dock with the plasma membrane. Bafilomycin A1 treatment reduced AQP5 plasma membrane expression by 27%. Conclusions AQP5 localizes to spheroidal, linear cytoplasmic vesicles in the differentiating bovine lens fiber cells. During fiber cell differentiation, these vesicles incorporate LC3B and presumably fuse with LIMP-2–positive lysosomes. Our data suggest that AQP5 to the plasma membrane through lysosome-associated unconventional protein secretion, a novel mechanism of AQP5 trafficking.
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Affiliation(s)
- Romell B Gletten
- Department of Biochemistry, Vanderbilt University, Nashville, Tennessee, United States
| | - Lee S Cantrell
- Department of Biochemistry, Vanderbilt University, Nashville, Tennessee, United States
| | - Sujoy Bhattacharya
- Department of Ophthalmology and Visual Sciences, Vanderbilt University, Nashville, Tennessee, United States
| | - Kevin L Schey
- Department of Biochemistry, Vanderbilt University, Nashville, Tennessee, United States
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24
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Zhang X, Ma P, Shao T, Xiong Y, Du Q, Chen S, Miao B, Zhang X, Wang X, Huang Y, Tong D. Porcine parvovirus triggers autophagy through the AMPK/Raptor/mTOR pathway to promote viral replication in porcine placental trophoblasts. Vet Res 2022; 53:33. [PMID: 35505413 PMCID: PMC9066968 DOI: 10.1186/s13567-022-01048-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/08/2021] [Accepted: 03/15/2022] [Indexed: 11/16/2022] Open
Abstract
Autophagy has been demonstrated to play important roles in the infection and pathogenesis of many viruses. We previously found that porcine parvovirus (PPV) infection can induce autophagy in porcine placental trophoblast cells (PTCs), but its underlying mechanism has not yet been fully revealed. In this study, we showed that PPV infection inhibited the activation of mTORC1 and promoted the expression of Beclin 1 and LC3II in PTCs. Treatment with a mTOR activator inhibited the expression of Beclin 1 and LC3II, as well as autophagy formation, and reduced viral replication in PPV-infected PTCs. Furthermore, we found that inhibition of AMPK expression, but not the inhibition of PI3K/Akt, p53, or MAPK/ERK1/2 pathway activation, can significantly increase mTOR phosphorylation in PPV-infected PTCs. Then, we found that the regulation of mTOR phosphorylation by AMPK was mediated by Raptor. AMPK expression knockout inhibited the activation of Raptor, decreased the expression of Beclin 1 and LC3II, suppressed the formation of autophagosomes, and reduced viral replication during PPV infection. Together, our results showed that PPV infection induces autophagy to promote viral replication by inhibiting the activation of mTORC1 through activation of the AMPK/Raptor pathway. These findings provide information to understand the molecular mechanisms of PPV-induced autophagy.
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Affiliation(s)
- Xiujuan Zhang
- College of Veterinary Medicine, Northwest A&F University, Yangling, 712100, China
| | - Peipei Ma
- College of Veterinary Medicine, Northwest A&F University, Yangling, 712100, China
| | - Ting Shao
- College of Veterinary Medicine, Northwest A&F University, Yangling, 712100, China
| | - Yingli Xiong
- College of Veterinary Medicine, Northwest A&F University, Yangling, 712100, China
| | - Qian Du
- College of Veterinary Medicine, Northwest A&F University, Yangling, 712100, China
| | - Songbiao Chen
- College of Veterinary Medicine, Northwest A&F University, Yangling, 712100, China
| | - Bichen Miao
- College of Veterinary Medicine, Northwest A&F University, Yangling, 712100, China
| | - Xuezhi Zhang
- College of Veterinary Medicine, Northwest A&F University, Yangling, 712100, China
| | - Xiaoya Wang
- College of Veterinary Medicine, Northwest A&F University, Yangling, 712100, China
| | - Yong Huang
- College of Veterinary Medicine, Northwest A&F University, Yangling, 712100, China.
| | - Dewen Tong
- College of Veterinary Medicine, Northwest A&F University, Yangling, 712100, China.
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25
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Gheyas R, Ortega-Alvarez R, Chauss D, Kantorow M, Menko AS. Suppression of PI3K signaling is linked to autophagy activation and the spatiotemporal induction of the lens organelle free zone. Exp Cell Res 2022; 412:113043. [PMID: 35101390 PMCID: PMC8859841 DOI: 10.1016/j.yexcr.2022.113043] [Citation(s) in RCA: 17] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/06/2021] [Revised: 01/03/2022] [Accepted: 01/18/2022] [Indexed: 12/12/2022]
Abstract
The terminal steps of lens cell differentiation require elimination of all organelles to create a central Organelle Free Zone (OFZ) that is required for lens function of focusing images on the retina. Previous studies show that the spatiotemporal elimination of these organelles during development is autophagy-dependent. We now show that the inhibition of PI3K signaling in lens organ culture results in the premature induction of autophagy within 24 h, including a significant increase in LAMP1+ lysosomes, and the removal of lens organelles from the center of the lens. Specific inhibition of just the PI3K/Akt signaling axis was directly linked to the elimination of mitochondria and ER, while pan-PI3K inhibitors that block all PI3K downstream signaling removed all organelles, including nuclei. Therefore, blocking the PI3K/Akt pathway was alone insufficient to remove nuclei. RNAseq analysis revealed increased mRNA levels of the endogenous inhibitor of PI3K activation, PIK3IP1, in differentiating lens fiber cells preceding the induction of OFZ formation. Co-immunoprecipitation confirmed that PIK3IP1 associates with multiple PI3K p110 isoforms just prior to formation of the OFZ, providing a likely endogenous mechanism for blocking all PI3K signaling and activating the autophagy pathway required to form the OFZ during lens development.
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Affiliation(s)
- Rifah Gheyas
- Department of Pathology, Anatomy and Cell Biology, Thomas Jefferson University, Philadelphia, PA, USA
| | - Ramon Ortega-Alvarez
- Department of Pathology, Anatomy and Cell Biology, Thomas Jefferson University, Philadelphia, PA, USA
| | - Daniel Chauss
- Schmidt College of Medicine, Florida Atlantic University, Boca Raton, FL, USA
| | - Marc Kantorow
- Schmidt College of Medicine, Florida Atlantic University, Boca Raton, FL, USA
| | - A Sue Menko
- Department of Pathology, Anatomy and Cell Biology, Thomas Jefferson University, Philadelphia, PA, USA.
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26
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Lu SY, Guo S, Chai SB, Yang JQ, Yue Y, Li H, Yan HF, Zhang T, Sun PM, Sun HW, Zhou JL, Yang JW, Li ZP, Cui Y. Proteomic analysis of the effects of simulated microgravity in human gastric mucosal cells. LIFE SCIENCES IN SPACE RESEARCH 2022; 32:26-37. [PMID: 35065758 DOI: 10.1016/j.lssr.2021.10.001] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/20/2021] [Revised: 09/30/2021] [Accepted: 10/06/2021] [Indexed: 06/14/2023]
Abstract
Microgravity is an ecological factor that affects the environment of the body. In this study, quantitative isobaric labeling (tandem mass tag) method was used to study the changes in human gastric mucosal cells under simulated microgravity for the first time. Comparative proteomic analysis identified 394 (202 upregulated and 192 downregulated) and 542 (286 upregulated and 256 downregulated) proteins differentially regulated by simulated microgravity after 3 and 7 days, respectively. Then the identified proteins were subjected to Gene Ontology and Kyoto Encyclopedia of Genes and Genomes analyses for further exploration. The results of the analysis showed that the ribosomes of gastric mucosal cells were significantly impacted after exposure to simulated microgravity for 3 days, and the cells appeared to be in a state of stress and inflammation. Exposure to simulated microgravity for 7 days significantly affected the mitochondria of the cells, oxidative stress became more evident, while inflammation and weakened connections were observed in the cells. The results of this study highlighted the temporal response trend of gastric mucosal cells to the stressor of microgravity at the two time points of 3 and 7 days. These findings will provide insights into the development of methods to protect the gastric mucosa during space flight.
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Affiliation(s)
- Sheng-Yu Lu
- Department of General Surgery, The 306th Hospital of PLA-Peking University Teaching Hospital, Beijing 100101, China; Department of General Surgery, Strategic Support Force Medical Center, Beijing 100101, China
| | - Song Guo
- Department of General Surgery, The 306th Hospital of PLA-Peking University Teaching Hospital, Beijing 100101, China; Department of General Surgery, Strategic Support Force Medical Center, Beijing 100101, China
| | - Shao-Bin Chai
- Department of General Surgery, Strategic Support Force Medical Center, Beijing 100101, China
| | - Jia-Qi Yang
- Department of General Surgery, The 306th Hospital of PLA-Peking University Teaching Hospital, Beijing 100101, China; Department of General Surgery, Strategic Support Force Medical Center, Beijing 100101, China
| | - Yuan Yue
- Department of General Surgery, The 306th Hospital of PLA-Peking University Teaching Hospital, Beijing 100101, China; Department of General Surgery, Strategic Support Force Medical Center, Beijing 100101, China
| | - Hao Li
- Department of General Surgery, Strategic Support Force Medical Center, Beijing 100101, China
| | - Hong-Feng Yan
- Department of General Surgery, Strategic Support Force Medical Center, Beijing 100101, China
| | - Tao Zhang
- Department of General Surgery, Strategic Support Force Medical Center, Beijing 100101, China
| | - Pei-Ming Sun
- Department of General Surgery, Strategic Support Force Medical Center, Beijing 100101, China
| | - Hong-Wei Sun
- Department of General Surgery, Strategic Support Force Medical Center, Beijing 100101, China
| | - Jin-Lian Zhou
- Department of Pathology, Strategic Support Force Medical Center, Beijing 100101, China
| | - Jian-Wu Yang
- Department of General Surgery, Strategic Support Force Medical Center, Beijing 100101, China
| | - Zheng-Peng Li
- Department of Gastroenterology and Hepatology, The First Medical Center, Chinese PLA General Hospital, Beijing, 100853, China.
| | - Yan Cui
- Department of General Surgery, The 306th Hospital of PLA-Peking University Teaching Hospital, Beijing 100101, China; Department of General Surgery, Strategic Support Force Medical Center, Beijing 100101, China.
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27
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Yang L, Yu P, Chen M, Lei B. Mammalian Target of Rapamycin Inhibitor Rapamycin Alleviates 7-Ketocholesterol Induced Inflammatory Responses and Vascular Endothelial Growth Factor Elevation by Regulating MAPK Pathway in Human Retinal Pigment Epithelium Cells. J Ocul Pharmacol Ther 2021; 38:189-200. [PMID: 34936813 DOI: 10.1089/jop.2021.0082] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022] Open
Abstract
Purpose: To validate the protective effect of a mammalian target of rapamycin (mTOR) inhibitor on human retinal pigment epithelium (RPE) cells challenged with 7-ketocholesterol (7-KC) and explored the underlying mechanisms. Methods: Human primary RPE (hRPE) cells and ARPE-19 cells were cultured with or without 10 nM of rapamycin for 6 h before being exposed to 10 μM of 7-KC for 24 h. The transcriptome of 7-KC challenged ARPE-19 cells was investigated by RNA sequencing (RNA-seq). The effects of 7-KC and rapamycin on the viability of ARPE-19 cells were measured with CCK-8. Gene expression was verified by real-time PCR, and protein levels were determined by ELISA or Western blotting. Results: The expression of IL-6, IL-8, and vascular endothelial growth factor (VEGF) in RPE cells was markedly increased after stimulation with 7-KC for 12/24 h compared with the controls. RNA-seq showed that a total of 10,243 genes were differentially expressed, with 5,518 genes upregulated and 4,725 genes downregulated between the 7-KC treated and the control group. Gene ontology and Kyoto Encyclopedia of Genes and Genomes enrichment analysis showed that 7-KC stimulation activated mTOR signaling and other pathways, including adherent junction, MAPK, and Wnt signalings. mTOR inhibitor rapamycin significantly suppressed the elevation of IL-6, IL-8, and VEGF stimulated by 7-KC. Rapamycin not only decreased the level of phosphorylated mTOR, P70S6K, 4EBP1 but also inhibited the activation of MAPK pathway. Conclusions: Inhibition of mTOR signaling pathway suppressed the elevation of inflammatory cytokines IL-6, IL-8, and the angiogenic agent VEGF induced by 7-KC. The protective effect of rapamycin was associated with its downregulation on MAPK pathway.
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Affiliation(s)
- Lin Yang
- Zhengzhou University People's Hospital, Henan Provincial People's Hospital, Henan Eye Institute, Henan Eye Hospital, Zhengzhou, China.,Academy of Medical Sciences, Zhengzhou University, Zhengzhou, China
| | - Peng Yu
- Department of Ophthalmology, People's Hospital of Changshou District, Chongqing, China
| | - Mei Chen
- Centre for Experimental Medicine, Queen's University, Belfast, United Kingdom
| | - Bo Lei
- Zhengzhou University People's Hospital, Henan Provincial People's Hospital, Henan Eye Institute, Henan Eye Hospital, Zhengzhou, China.,Academy of Medical Sciences, Zhengzhou University, Zhengzhou, China
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28
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Lee JW, Kim MO, Song YN, Min JH, Kim SM, Kang MJ, Oh ES, Lee RW, Jung S, Ro H, Lee JK, Ryu HW, Lee DY, Lee SU. Compound K ameliorates airway inflammation and mucus secretion through the regulation of PKC signaling in vitro and in vivo. J Ginseng Res 2021; 46:496-504. [PMID: 35600779 PMCID: PMC9120799 DOI: 10.1016/j.jgr.2021.12.008] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/09/2021] [Revised: 12/20/2021] [Accepted: 12/21/2021] [Indexed: 11/25/2022] Open
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29
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Ping X, Liang J, Shi K, Bao J, Wu J, Yu X, Tang X, Zou J, Shentu X. Rapamycin relieves the cataract caused by ablation of Gja8b through stimulating autophagy in zebrafish. Autophagy 2021; 17:3323-3337. [PMID: 33472493 PMCID: PMC8632074 DOI: 10.1080/15548627.2021.1872188] [Citation(s) in RCA: 37] [Impact Index Per Article: 12.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/25/2019] [Accepted: 12/29/2020] [Indexed: 12/30/2022] Open
Abstract
Macroautophagy/autophagy is known to be important for intracellular quality control in the lens. GJA8 is a major gap junction protein in vertebrate lenses. Mutations in GJA8 cause cataracts in humans. The well-known cataractogenesis mechanism is that mutated GJA8 leads to abnormal assembly of gap junctions, resulting in defects in intercellular communication among lens cells. In this study, we observed that ablation of Gja8b (a homolog of mammalian GJA8) in zebrafish led to severe defects in organelle degradation, an important cause of cataractogenesis in developing lens. The role of autophagy in organelle degradation in lens remains disputable. Intriguingly, we also observed that ablation of Gja8b induced deficient autophagy in the lens. More importantly, in vivo treatment of zebrafish with rapamycin, an autophagy activator that inhibits MAPK/JNK and MTORC1 signaling, stimulated autophagy in the lens and relieved the defects in organelle degradation, resulting in the mitigation of cataracts in gja8b mutant zebrafish. Conversely, inhibition of autophagy by treatment with the chemical reagent 3-MA blocked these recovery effects, suggesting the important roles of autophagy in organelle degradation in the lens in gja8b mutant zebrafish. Further studies in HLE cells revealed that GJA8 interacted with ATG proteins. Overexpression of GJA8 stimulated autophagy in HLE cells. These data suggest an unrecognized cataractogenesis mechanism caused by ablation of Gja8b and a potential treatment for cataracts by stimulating autophagy in the lens.Abbreviations: 3-MA: 3-methyladenine; ATG: autophagy related; AV: autophagic vacuoles; Dpf: days post fertilization; GJA1: gap junction protein alpha 1; GJA3: gap junction protein alpha 3; GJA8: gap junction protein alpha 8; Hpf: hours post fertilization; MAP1LC3/LC3: microtubule associated protein 1 light chain 3; MTOR: mechanistic target of rapamycin kinase; PtdIns3K: class III phosphatidylinositol 3-kinase; WT: wild type.
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Affiliation(s)
- Xiyuan Ping
- Eye Center of the Second Affiliated Hospital of Zhejiang University, School of Medicine, Hangzhou, China
- Zhejiang Provincial Key Lab of Ophthalmology, Hangzhou, Zhejiang Province, China
| | - Jiancheng Liang
- Eye Center of the Second Affiliated Hospital of Zhejiang University, School of Medicine, Hangzhou, China
- Zhejiang Provincial Key Lab of Ophthalmology, Hangzhou, Zhejiang Province, China
- The Institute of Translational Medicine, Zhejiang University, Hangzhou, China
| | - Kexin Shi
- Eye Center of the Second Affiliated Hospital of Zhejiang University, School of Medicine, Hangzhou, China
- Zhejiang Provincial Key Lab of Ophthalmology, Hangzhou, Zhejiang Province, China
| | - Jing Bao
- Eye Center of the Second Affiliated Hospital of Zhejiang University, School of Medicine, Hangzhou, China
- Zhejiang Provincial Key Lab of Ophthalmology, Hangzhou, Zhejiang Province, China
| | - Jing Wu
- Eye Center of the Second Affiliated Hospital of Zhejiang University, School of Medicine, Hangzhou, China
- Zhejiang Provincial Key Lab of Ophthalmology, Hangzhou, Zhejiang Province, China
| | - Xiaoning Yu
- Eye Center of the Second Affiliated Hospital of Zhejiang University, School of Medicine, Hangzhou, China
- Zhejiang Provincial Key Lab of Ophthalmology, Hangzhou, Zhejiang Province, China
| | - Xiajing Tang
- Eye Center of the Second Affiliated Hospital of Zhejiang University, School of Medicine, Hangzhou, China
- Zhejiang Provincial Key Lab of Ophthalmology, Hangzhou, Zhejiang Province, China
| | - Jian Zou
- Eye Center of the Second Affiliated Hospital of Zhejiang University, School of Medicine, Hangzhou, China
- Zhejiang Provincial Key Lab of Ophthalmology, Hangzhou, Zhejiang Province, China
- The Institute of Translational Medicine, Zhejiang University, Hangzhou, China
| | - Xingchao Shentu
- Eye Center of the Second Affiliated Hospital of Zhejiang University, School of Medicine, Hangzhou, China
- Zhejiang Provincial Key Lab of Ophthalmology, Hangzhou, Zhejiang Province, China
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30
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Disatham J, Brennan L, Chauss D, Kantorow J, Afzali B, Kantorow M. A functional map of genomic HIF1α-DNA complexes in the eye lens revealed through multiomics analysis. BMC Genomics 2021; 22:497. [PMID: 34215186 PMCID: PMC8254356 DOI: 10.1186/s12864-021-07795-9] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/16/2021] [Accepted: 06/09/2021] [Indexed: 12/13/2022] Open
Abstract
BACKGROUND During eye lens development the embryonic vasculature regresses leaving the lens without a direct oxygen source. Both embryonically and throughout adult life, the lens contains a decreasing oxygen gradient from the surface to the core that parallels the natural differentiation of immature surface epithelial cells into mature core transparent fiber cells. These properties of the lens suggest a potential role for hypoxia and the master regulator of the hypoxic response, hypoxia-inducible transcription factor 1 (HIF1), in the regulation of genes required for lens fiber cell differentiation, structure and transparency. Here, we employed a multiomics approach combining CUT&RUN, RNA-seq and ATACseq analysis to establish the genomic complement of lens HIF1α binding sites, genes activated or repressed by HIF1α and the chromatin states of HIF1α-regulated genes. RESULTS CUT&RUN analysis revealed 8375 HIF1α-DNA binding complexes in the chick lens genome. One thousand one hundred ninety HIF1α-DNA binding complexes were significantly clustered within chromatin accessible regions (χ2 test p < 1 × 10- 55) identified by ATACseq. Formation of the identified HIF1α-DNA complexes paralleled the activation or repression of 526 genes, 116 of which contained HIF1α binding sites within 10kB of the transcription start sites. Some of the identified HIF1α genes have previously established lens functions while others have novel functions never before examined in the lens. GO and pathway analysis of these genes implicate HIF1α in the control of a wide-variety of cellular pathways potentially critical for lens fiber cell formation, structure and function including glycolysis, cell cycle regulation, chromatin remodeling, Notch and Wnt signaling, differentiation, development, and transparency. CONCLUSIONS These data establish the first functional map of genomic HIF1α-DNA complexes in the eye lens. They identify HIF1α as an important regulator of a wide-variety of genes previously shown to be critical for lens formation and function and they reveal a requirement for HIF1α in the regulation of a wide-variety of genes not yet examined for lens function. They support a requirement for HIF1α in lens fiber cell formation, structure and function and they provide a basis for understanding the potential roles and requirements for HIF1α in the development, structure and function of more complex tissues.
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Affiliation(s)
- Joshua Disatham
- Charles E. Schmidt College of Medicine, Florida Atlantic University, 777 Glades Rd., Boca Raton, FL 33431 USA
| | - Lisa Brennan
- Charles E. Schmidt College of Medicine, Florida Atlantic University, 777 Glades Rd., Boca Raton, FL 33431 USA
| | - Daniel Chauss
- Immunoregulation Section, Kidney Diseases Branch, National Institute of Diabetes and Digestive and Kidney Diseases (NIDDK), NIH, Bethesda, MD 20892 USA
| | | | - Behdad Afzali
- Immunoregulation Section, Kidney Diseases Branch, National Institute of Diabetes and Digestive and Kidney Diseases (NIDDK), NIH, Bethesda, MD 20892 USA
| | - Marc Kantorow
- Charles E. Schmidt College of Medicine, Florida Atlantic University, 777 Glades Rd., Boca Raton, FL 33431 USA
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Mechanisms of organelle elimination for lens development and differentiation. Exp Eye Res 2021; 209:108682. [PMID: 34214522 DOI: 10.1016/j.exer.2021.108682] [Citation(s) in RCA: 26] [Impact Index Per Article: 8.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/29/2021] [Revised: 06/03/2021] [Accepted: 06/19/2021] [Indexed: 12/23/2022]
Abstract
A hallmark feature of lens development and differentiation is the complete elimination of organelles from the center of the eye lens. A long unanswered question in lens biology is what are the mechanisms that control the elimination of organelles during the terminal remodeling program to form mature lens fiber cells? Recent advances have expanded our understanding of these mechanisms including newly discovered signaling pathways, proteasomal regulators, autophagy proteins, transcription factors and the hypoxic environment of the lens itself. These recent discoveries suggest that distinct mechanisms coordinate the elimination of the nucleus, mitochondria, endoplasmic reticulum and Golgi apparatus during lens fiber cell differentiation. Since regulation of organelle number and distribution is also a feature of the terminal remodeling programs of more complex cell-types and tissues, these advances are likely to impact a wide-variety of fields.
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Sahai R, Bhattacharjee A, Shukla VN, Yadav P, Hasanain M, Sarkar J, Narender T, Mitra K. Gedunin isolated from the mangrove plant Xylocarpus granatum exerts its anti-proliferative activity in ovarian cancer cells through G2/M-phase arrest and oxidative stress-mediated intrinsic apoptosis. Apoptosis 2021; 25:481-499. [PMID: 32399945 DOI: 10.1007/s10495-020-01605-5] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
Gedunin is a natural tetranorterpenoid secondary metabolite found in plants of the Meliaceae family, which has been reported for its antiparasitic, antifungal and anticancer activities. Here, we describe the molecular mechanisms underlying the in vitro anti proliferative activity of gedunin (isolated from the mangrove plant Xylocarpus granatum) in human ovarian cancer cells. We observed that gedunin triggered severe ROS generation leading to DNA damage and cell cycle arrest in G2/M phase thus inhibiting cell proliferation. ROS upregulation also led to mitochondrial stress and membrane depolarization, which eventually resulted in mitochondria-mediated apoptosis following cytochrome C release, caspase 9, 3 activation, and PARP cleavage. Transmission electron microscopy of gedunin treated cells revealed sub-cellular features typical of apoptosis. Moreover, an upregulation in stress kinases like phospho-ERK 1/2, phospho-p38 and phospho-JNK was also observed in gedunin treated cells. Free radical scavenger N-Acetyl-L-Cysteine (NAC) reversed all these effects resulting in increased cell survival, abrogation of cell cycle arrest, rescue of mitochondrial membrane potential and suppression of apoptotic markers. Interestingly, gedunin is also an inhibitor of the evolutionarily conserved molecular chaperone Heat Shock Protein 90 (hsp90) responsible for maintaining cellular homeostasis. Targeting this chaperone could be an attractive strategy for developing cancer therapeutics since many oncogenic proteins are also client proteins of hsp90. Collectively, our findings provide insights into the molecular mechanism of action of gedunin, which may aid drug development efforts against ovarian cancer.
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Affiliation(s)
- Rohit Sahai
- Electron Microscopy Unit, Sophisticated Analytical Instrument Facility and Research, CSIR - Central Drug Research Institute, Sector-10, Jankipuram Extension, Lucknow, Uttar Pradesh, 226 031, India
| | - Arindam Bhattacharjee
- Electron Microscopy Unit, Sophisticated Analytical Instrument Facility and Research, CSIR - Central Drug Research Institute, Sector-10, Jankipuram Extension, Lucknow, Uttar Pradesh, 226 031, India
| | - Vishwa Nath Shukla
- Medicinal and Process Chemistry Division, CSIR - Central Drug Research Institute, Sector-10, Jankipuram Extension, Lucknow, Uttar Pradesh, 226 031, India
| | - Pragya Yadav
- Medicinal and Process Chemistry Division, CSIR - Central Drug Research Institute, Sector-10, Jankipuram Extension, Lucknow, Uttar Pradesh, 226 031, India.,Academy of Scientific and Innovative Research, Ghaziabad, Uttar Pradesh, 201 002, India
| | - Mohammad Hasanain
- Division of Biochemistry, CSIR - Central Drug Research Institute, Sector-10, Jankipuram Extension, Lucknow, Uttar Pradesh, 226 031, India.,Academy of Scientific and Innovative Research, Ghaziabad, Uttar Pradesh, 201 002, India
| | - Jayanta Sarkar
- Division of Biochemistry, CSIR - Central Drug Research Institute, Sector-10, Jankipuram Extension, Lucknow, Uttar Pradesh, 226 031, India.,Academy of Scientific and Innovative Research, Ghaziabad, Uttar Pradesh, 201 002, India
| | - T Narender
- Medicinal and Process Chemistry Division, CSIR - Central Drug Research Institute, Sector-10, Jankipuram Extension, Lucknow, Uttar Pradesh, 226 031, India.,Academy of Scientific and Innovative Research, Ghaziabad, Uttar Pradesh, 201 002, India
| | - Kalyan Mitra
- Electron Microscopy Unit, Sophisticated Analytical Instrument Facility and Research, CSIR - Central Drug Research Institute, Sector-10, Jankipuram Extension, Lucknow, Uttar Pradesh, 226 031, India. .,Academy of Scientific and Innovative Research, Ghaziabad, Uttar Pradesh, 201 002, India.
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33
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Organelle degradation in the lens by PLAAT phospholipases. Nature 2021; 592:634-638. [PMID: 33854238 DOI: 10.1038/s41586-021-03439-w] [Citation(s) in RCA: 65] [Impact Index Per Article: 21.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/17/2019] [Accepted: 03/10/2021] [Indexed: 02/02/2023]
Abstract
The eye lens of vertebrates is composed of fibre cells in which all membrane-bound organelles undergo degradation during terminal differentiation to form an organelle-free zone1. The mechanism that underlies this large-scale organelle degradation remains largely unknown, although it has previously been shown to be independent of macroautophagy2,3. Here we report that phospholipases in the PLAAT (phospholipase A/acyltransferase, also known as HRASLS) family-Plaat1 (also known as Hrasls) in zebrafish and PLAAT3 (also known as HRASLS3, PLA2G16, H-rev107 or AdPLA) in mice4-6-are essential for the degradation of lens organelles such as mitochondria, the endoplasmic reticulum and lysosomes. Plaat1 and PLAAT3 translocate from the cytosol to various organelles immediately before organelle degradation, in a process that requires their C-terminal transmembrane domain. The translocation of Plaat1 to organelles depends on the differentiation of fibre cells and damage to organelle membranes, both of which are mediated by Hsf4. After the translocation of Plaat1 or PLAAT3 to membranes, the phospholipase induces extensive organelle rupture that is followed by complete degradation. Organelle degradation by PLAAT-family phospholipases is essential for achieving an optimal transparency and refractive function of the lens. These findings expand our understanding of intracellular organelle degradation and provide insights into the mechanism by which vertebrates acquired transparent lenses.
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Cao Y, Li P, Zhang G, Kang L, Zhou T, Wu J, Wang Y, Wang Y, Chen X, Guan H. MicroRNA Let-7c-5p-Mediated Regulation of ERCC6 Disrupts Autophagic Flux in Age-Related Cataract via the Binding to VCP. Curr Eye Res 2021; 46:1353-1362. [PMID: 33703976 DOI: 10.1080/02713683.2021.1900273] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Abstract
Purpose: DNA damage contributes to the pathogenesis of age-related cataract (ARC) and is repaired through the nucleotide excision repair (NER) pathway, which includes ERCC6. Evidence has demonstrated that defective autophagy leads to lens organelle degradation and cataract. This study aimed to investigate the effects of ERCC6 on autophagy and determine its mechanisms in ARC.Methods: The clinical case-control study comprised 30 patients with ARC and 30 age-matched controls who received transparent lens extraction. Transmission electron microscopy was used to assess the ultrastructure of autophagic vesicles in lens anterior capsule tissues and lens epithelial cell line (SRA01/04). Real-time polymerase chain reaction and western blot analyses were performed to measure relative gene expression levels. Gene expression levels and localization were assessed by immunofluorescence. A coimmunoprecipitation assay was used to investigate the relationship between CSB which encoded by ERCC6 and VCP. ERCC6-siRNA and let-7 c-5p mimic were used to alter the expression of ERCC6 and let-7 c-5p.Results: Autophagy induction occurred in lens anterior capsule tissues of patients with ARC and in UVB-induced SRA01/04 cells, where the number of LC3B puncta was increased. Consistent with this result, the expression of beclin1 (BECN1) and LC3B, in addition to that of p62, was increased. Additionally, ERCC6 expression decreased, and silencing ERCC6 induced increases in the expression of BECN1, LC3B and p62. Moreover, CSB interacted with VCP, and let-7 c-5p induced dysregulation of autophagy by targeting ERCC6.Conclusion: In ARC, Let-7 c-5p-mediated downregulation of ERCC6 might prevent the degradation of autophagic vacuoles. CSB binds to VCP, inducing autophagosomes to combine with lysosomes and be degraded.
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Affiliation(s)
- Yu Cao
- Eye Institute, Affiliated Hospital of Nantong University, Nantong, Jiangsu, China
| | - Pengfei Li
- Eye Institute, Affiliated Hospital of Nantong University, Nantong, Jiangsu, China
| | - Guowei Zhang
- Eye Institute, Affiliated Hospital of Nantong University, Nantong, Jiangsu, China
| | - Lihua Kang
- Eye Institute, Affiliated Hospital of Nantong University, Nantong, Jiangsu, China
| | - Tianqiu Zhou
- Eye Institute, Affiliated Hospital of Nantong University, Nantong, Jiangsu, China
| | - Jian Wu
- Eye Institute, Affiliated Hospital of Nantong University, Nantong, Jiangsu, China
| | - Yong Wang
- Eye Institute, Affiliated Hospital of Nantong University, Nantong, Jiangsu, China
| | - Ying Wang
- Eye Institute, Affiliated Hospital of Nantong University, Nantong, Jiangsu, China
| | - Xiaojuan Chen
- Eye Institute, Affiliated Hospital of Nantong University, Nantong, Jiangsu, China
| | - Huaijin Guan
- Eye Institute, Affiliated Hospital of Nantong University, Nantong, Jiangsu, China
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35
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Tu C, Li H, Liu X, Wang Y, Li W, Meng L, Wang W, Li Y, Li D, Du J, Lu G, Lin G, Tan YQ. TDRD7 participates in lens development and spermiogenesis by mediating autophagosome maturation. Autophagy 2021; 17:3848-3864. [PMID: 33618632 DOI: 10.1080/15548627.2021.1894058] [Citation(s) in RCA: 18] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022] Open
Abstract
In humans, TDRD7 (tudor domain containing 7) mutations lead to a syndrome combining congenital cataracts (CCs) and non-obstructive azoospermia (NOA), characterized by abnormal lens development and spermiogenesis. However, the molecular mechanism underlying TDRD7's functions in eye and testicular development are still largely unknown. Here, we show that the depletion of this gene in mice and humans resulted in the accumulation of autophagosomes and the disruption of macroautophagic/autophagic flux. The disrupted autophagic flux in tdrd7-deficient mouse embryonic fibroblasts (MEFs) was caused by a failure of autophagosome fusion with lysosomes. Furthermore, transcriptome analysis and biochemical assays showed that TDRD7 might directly bind to Tbc1d20 mRNAs and downregulate its expression, which is a key regulator of autophagosome maturation, resulting in the disruption of autophagosome maturation. In addition, we provide evidence to show that TDRD7-mediated autophagosome maturation maintains lens transparency by facilitating the removal of damaged proteins and organelles from lens fiber cells and the biogenesis of acrosome. Altogether, our results showed that TDRD7 plays an essential role in the maturation of autophagosomes and that tdrd7 deletion results in eye defects and testicular abnormalities in mice, implicating disrupted autophagy might be the mechanism that contributes to lens development and spermiogenesis defects in human.Abbreviations: CB: chromatoid bodies; CC: congenital cataract; CTSD: cathepsin D; DMSO: dimethyl sulfoxide; LAMP1: lysosomal-associated membrane protein 1; LECs: lens epithelial cells; MAP1LC3/LC3/Atg8: microtubule-associated protein 1 light chain 3; MEFs: mouse embryonic fibroblasts; NOA: non-obstructive azoospermia; OFZ: organelle-free zone; RG: RNA granules; SQSTM1/p62: sequestosome 1; TBC1D20: TBC1 domain family member 20; TDRD7: tudor domain containing 7; TEM: transmission electron microscopy; WT: wild type.
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Affiliation(s)
- Chaofeng Tu
- Institute of Reproductive and Stem Cell Engineering, School of Basic Medical Science, Central South University, Changsha, China.,Clinical Research Center for Reproduction and Genetics in Hunan Province, Reproductive and Genetic Hospital of CITIC-Xiangya, Changsha, China.,The Center for Heart Development, Key Lab of MOE for Development Biology and Protein Chemistry, College of Life Sciences, Hunan Normal University, Changsha, China
| | - Haiyu Li
- Institute of Reproductive and Stem Cell Engineering, School of Basic Medical Science, Central South University, Changsha, China
| | - Xuyang Liu
- Shenzhen Key Laboratory of Ophthalmology, Shenzhen Eye Hospital, Jinan University, Shenzhen, China
| | - Ying Wang
- Institute of Reproductive and Stem Cell Engineering, School of Basic Medical Science, Central South University, Changsha, China
| | - Wei Li
- State Key Laboratory of Stem Cell and Reproductive Biology, Institute of Zoology, Chinese Academy of Sciences, Beijing, China
| | - Lanlan Meng
- Clinical Research Center for Reproduction and Genetics in Hunan Province, Reproductive and Genetic Hospital of CITIC-Xiangya, Changsha, China
| | - Weili Wang
- Institute of Reproductive and Stem Cell Engineering, School of Basic Medical Science, Central South University, Changsha, China
| | - Yong Li
- Institute of Reproductive and Stem Cell Engineering, School of Basic Medical Science, Central South University, Changsha, China
| | - Dongyan Li
- Institute of Reproductive and Stem Cell Engineering, School of Basic Medical Science, Central South University, Changsha, China
| | - Juan Du
- Institute of Reproductive and Stem Cell Engineering, School of Basic Medical Science, Central South University, Changsha, China.,Clinical Research Center for Reproduction and Genetics in Hunan Province, Reproductive and Genetic Hospital of CITIC-Xiangya, Changsha, China
| | - Guangxiu Lu
- Clinical Research Center for Reproduction and Genetics in Hunan Province, Reproductive and Genetic Hospital of CITIC-Xiangya, Changsha, China
| | - Ge Lin
- Institute of Reproductive and Stem Cell Engineering, School of Basic Medical Science, Central South University, Changsha, China.,Clinical Research Center for Reproduction and Genetics in Hunan Province, Reproductive and Genetic Hospital of CITIC-Xiangya, Changsha, China
| | - Yue-Qiu Tan
- Institute of Reproductive and Stem Cell Engineering, School of Basic Medical Science, Central South University, Changsha, China.,Clinical Research Center for Reproduction and Genetics in Hunan Province, Reproductive and Genetic Hospital of CITIC-Xiangya, Changsha, China
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Yang J, Xu L, Wu M, Fang H, Lu Y, Shi C, Wang Y, Jiang S, Ma Q, Li Z, Zhang L, Zhang L. Paeonol derivative-6 attenuates inflammation by activating ZEB2 in acute liver injury. Int Immunopharmacol 2021; 91:107235. [PMID: 33326919 DOI: 10.1016/j.intimp.2020.107235] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/26/2020] [Revised: 11/13/2020] [Accepted: 11/21/2020] [Indexed: 12/17/2022]
Abstract
Paeonol is a natural phenolic compound and isolated as an active ingredient from Moutan Cortex. Paeonol derivative-6 (DPF-6) is a derivative of paeonol improved in water solubility and bioavailability. Previous studies have reported that paeonol possesses a variety of pharmacological activities, such as antioxidant and anti-inflammatory properties. Moreover, we have previously verified that DPF-6 has anti-inflammatory effects. However, the role and fundamental mechanism of DPF-6 in acute liver injury (ALI) was still unclear. In this study, we indicated that DPF-6 inhibited inflammation and the expression of TNF-α, IL-6 and IL-1β in liver tissues and LPS-mediated L-02 cells, concomitant with the upregulated expression of ZEB2. More importantly, it was demonstrated that overexpression of ZEB2 inhibited the expression level of TNF-α, IL-6 and IL-1β in LPS-mediated L-02 cells. In contrast, knockdown of ZEB2 increased the expression level of TNF-α, IL-6 and IL-1β in LPS-mediated L-02 cells. Further studies showed that ZEB2 inhibited the inflammation cytokine secretion via JNK signaling pathway in L-02 cells. Taken together, all the above results indicate that DPF-6 increased the expression of ZEB2, consequently inhibited inflammation cytokine secretion through JNK signaling pathway, which may be utilized as a potential anti-inflammation monomeric compound in the treatment of ALI.
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Affiliation(s)
- Junfa Yang
- Key Laboratory of Anti-inflammatory and Immune Medicine, Ministry of Education, Institute of Clinical Pharmacology, Anhui Medical University, Hefei, China; School of Pharmacy, Anhui Medical University, Hefei 230032, China; The Key Laboratory of Anti-inflammatory and Immune Medicines, Ministry of Education, Anhui Medical University, Hefei 230032, China
| | - Lei Xu
- School of Pharmacy, Anhui Medical University, Hefei 230032, China; The Key Laboratory of Anti-inflammatory and Immune Medicines, Ministry of Education, Anhui Medical University, Hefei 230032, China
| | - Meifei Wu
- School of Pharmacy, Anhui Medical University, Hefei 230032, China; The Key Laboratory of Anti-inflammatory and Immune Medicines, Ministry of Education, Anhui Medical University, Hefei 230032, China
| | - Hui Fang
- Hangzhou Normal University Affiliated Hospital, Hangzhou 310015, China
| | - Yuchen Lu
- School of Pharmacy, Anhui Medical University, Hefei 230032, China; The Key Laboratory of Anti-inflammatory and Immune Medicines, Ministry of Education, Anhui Medical University, Hefei 230032, China
| | | | - Yang Wang
- School of Pharmacy, Anhui Medical University, Hefei 230032, China; The Key Laboratory of Anti-inflammatory and Immune Medicines, Ministry of Education, Anhui Medical University, Hefei 230032, China
| | - Shaowei Jiang
- The First Affiliated Hospital of Anhui Medical Unversity, Hefei, China
| | - Qiang Ma
- The Second Hosipital of Anhui Medical University, Hefei, Anhui Province, China
| | - Zeng Li
- School of Pharmacy, Anhui Medical University, Hefei 230032, China; The Key Laboratory of Anti-inflammatory and Immune Medicines, Ministry of Education, Anhui Medical University, Hefei 230032, China
| | - Lingling Zhang
- Key Laboratory of Anti-inflammatory and Immune Medicine, Ministry of Education, Institute of Clinical Pharmacology, Anhui Medical University, Hefei, China.
| | - Lei Zhang
- School of Pharmacy, Anhui Medical University, Hefei 230032, China; The Key Laboratory of Anti-inflammatory and Immune Medicines, Ministry of Education, Anhui Medical University, Hefei 230032, China.
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37
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Liu T, Di QN, Sun JH, Zhao M, Xu Q, Shen Y. Effects of nonylphenol induced oxidative stress on apoptosis and autophagy in rat ovarian granulosa cells. CHEMOSPHERE 2020; 261:127693. [PMID: 32736244 DOI: 10.1016/j.chemosphere.2020.127693] [Citation(s) in RCA: 35] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/29/2020] [Revised: 06/30/2020] [Accepted: 07/10/2020] [Indexed: 06/11/2023]
Abstract
Nonylphenol (NP) is a kind of environmental endocrine disruptors which is generally recognized to cause female reproductive toxicity, but its basic mechanism has not been fully elucidated. In this study, granulosa cells (GCs) were treated with 0-70 μM NP for 24 h, the cell viability of GCs was reduced significantly, as well as increased cell apoptosis with G2/M arrest. Furthermore, NP significantly induced autophagy and the production of reactive oxygen species (ROS). However, these phenomenons were inhibited by blocking the production of ROS with N-Acetyl-l-cysteine (NAC) administration. Intriguingly, the inhibition of autophagy with 3-Methyladenine (3-MA) could enhance the apoptosis induced by NP. Moreover, the down regulating of p-Akt/Akt, p-mTOR/mTOR and subsequent up-regulation of p-AMPK/AMPK induced by NP can be rescued by pretreatment of NAC. Our findings suggested that NP promotes rat ovarian GCs apoptosis and autophagy simultaneously, which may involve the activation of ROS-dependent Akt/AMPK/mTOR pathway. Whatever, the activation of autophagy is likely to develop a protective mechanism to improve the apoptosis of rat ovarian GCs induced by NP.
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Affiliation(s)
- Teng Liu
- Key Laboratory of Environmental Medicine Engineering, Ministry of Education, School of Public Health, Southeast University, Nanjing, China
| | - Qian-Nan Di
- Key Laboratory of Environmental Medicine Engineering, Ministry of Education, School of Public Health, Southeast University, Nanjing, China
| | - Jia-Hui Sun
- Key Laboratory of Environmental Medicine Engineering, Ministry of Education, School of Public Health, Southeast University, Nanjing, China
| | - Meng Zhao
- Key Laboratory of Environmental Medicine Engineering, Ministry of Education, School of Public Health, Southeast University, Nanjing, China
| | - Qian Xu
- Key Laboratory of Environmental Medicine Engineering, Ministry of Education, School of Public Health, Southeast University, Nanjing, China.
| | - Yang Shen
- Department of Obstetrics and Gynecology, Zhongda Hospital, School of Medicine, Southeast University, Nanjing, China.
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38
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Hou B, Liu S, Li E, Jiang X. Different Role of Raptor and Rictor in Regulating Rasfonin-Induced Autophagy and Apoptosis in Renal Carcinoma Cells. Chem Biodivers 2020; 17:e2000743. [PMID: 33155352 DOI: 10.1002/cbdv.202000743] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/08/2020] [Accepted: 11/05/2020] [Indexed: 01/18/2023]
Abstract
Both Raptor and Rictor are the key components in the complexes of mammalian target of rapamycin (mTOR), which play a vital role in mediating autophagy. Unlike mTOR, the regulatory role of either Raptor or Rictor in the regulation of autophagic process is relatively less explored. In present study, we found that rasfonin, which isolated from Talaromyces sp. 3656-A1 and was a fungal natural product, activated both caspase-dependent apoptosis and autophagy in ACHN, a renal carcinoma cell line. Knockdown of Raptor decreased both rasfonin-induced autophagic flux and PARP-1 cleavage, and in contrast, Rictor silencing increased apoptosis concomitantly enhancing rasfonin-induced autophagy. Unexpectedly, API-2, which was widely used as an inhibitor of Akt, promoted rasfonin-dependent autophagy in Raptor-depleted but not Rictor-deprived cells. Collectively, these results demonstrated that Raptor and Rictor could play a distinctly regulatory role in rasfonin-enhanced autophagy and apoptosis.
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Affiliation(s)
- Bolin Hou
- State Key Laboratory of Mycology, Institute of Microbiology, Chinese Academy of Sciences, Beijing, 100101, P. R. China.,University of Chinese Academy of Sciences, Beijing, 100039, P. R. China
| | - Shuchun Liu
- State Key Laboratory of Mycology, Institute of Microbiology, Chinese Academy of Sciences, Beijing, 100101, P. R. China
| | - Erwei Li
- State Key Laboratory of Mycology, Institute of Microbiology, Chinese Academy of Sciences, Beijing, 100101, P. R. China
| | - Xuejun Jiang
- State Key Laboratory of Mycology, Institute of Microbiology, Chinese Academy of Sciences, Beijing, 100101, P. R. China
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39
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Costello MJ, Gilliland KO, Mohamed A, Schey KL, Johnsen S, Brennan LA, Kantorow M. Novel mitochondrial derived Nuclear Excisosome degrades nuclei during differentiation of prosimian Galago (bush baby) monkey lenses. PLoS One 2020; 15:e0241631. [PMID: 33180800 PMCID: PMC7660580 DOI: 10.1371/journal.pone.0241631] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/03/2020] [Accepted: 10/16/2020] [Indexed: 11/18/2022] Open
Abstract
The unique cellular organization and transparent function of the ocular lens depend on the continuous differentiation of immature epithelial cells on the lens anterior surface into mature elongated fiber cells within the lens core. A ubiquitous event during lens differentiation is the complete elimination of organelles required for mature lens fiber cell structure and transparency. Distinct pathways have been identified to mediate the elimination of non-nuclear organelles and nuclei. Recently, we reported the discovery of a unique structure in developing fiber cells of the chick embryo lens, called the Nuclear Excisosome, that is intractably associated with degrading nuclei during lens fiber cell differentiation. In the chick lens, the Nuclear Excisosome is derived from projections of adjacent cells contacting the nuclear envelope during nuclear elimination. Here, we demonstrate that, in contrast to the avian model, Nuclear Excisosomes in a primate model, Galago (bush baby) monkeys, are derived through the recruitment of mitochondria to form unique linear assemblies that define a novel primate Nuclear Excisosome. Four lenses from three monkeys aged 2–5 years were fixed in formalin, followed by paraformaldehyde, then processed for Airyscan confocal microscopy or transmission electron microscopy. For confocal imaging, fluorescent dyes labelled membranes, carbohydrate in the extracellular space, filamentous actin and nuclei. Fiber cells from Galago lenses typically displayed prominent linear structures within the cytoplasm with a distinctive cross-section of four membranes and lengths up to 30 μm. The outer membranes of these linear structures were observed to attach to the outer nuclear envelope membrane to initiate degradation near the organelle-free zone. The origin of these unique structures was mitochondria in the equatorial epithelium (not from plasma membranes of adjacent cells as in the chick embryo model). Early changes in mitochondria appeared to be the collapse of the cristae and modification of one side of the mitochondrial outer membrane to promote accumulation of protein in a dense cluster. As a mitochondrion surrounded the dense protein cluster, an outer mitochondrial membrane enclosed the protein to form a core and another outer mitochondrial membrane formed the outermost layer. The paired membranes of irregular texture between the inner core membrane and the outer limiting membrane appeared to be derived from modified mitochondrial cristae. Several mitochondria were involved in the formation and maturation of these unique complexes that apparently migrated around the fulcrum into the cytoplasm of nascent fiber cells where they were stabilized until the nuclear degradation was initiated. Thus, unlike in the chick embryo, the Galago lenses degraded nuclear envelopes with a Nuclear Excisosome derived from multiple mitochondria in the epithelium that formed novel linear assemblies in developing fiber cells. These findings suggest that recruitment of distinct structures is required for Nuclear Excisosome formation in different species.
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Affiliation(s)
- M Joseph Costello
- Department of Cell Biology and Physiology, University of North Carolina, Chapel Hill, NC, United States of America
| | - Kurt O Gilliland
- Department of Cell Biology and Physiology, University of North Carolina, Chapel Hill, NC, United States of America
| | - Ashik Mohamed
- Ophthalmic Biophysics, L V Prasad Eye Institute, Hyderabad, Telangana, India
| | - Kevin L Schey
- Biochemistry Department, Vanderbilt University, Nashville, TN, United States of America
| | - Sönke Johnsen
- Biology Department, Duke University, Durham, NC, United States of America
| | - Lisa A Brennan
- Department of Biomedical Science, Florida Atlantic University, Boca Raton, FL, United States of America
| | - Marc Kantorow
- Department of Biomedical Science, Florida Atlantic University, Boca Raton, FL, United States of America
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Chen CH, Li YR, Lin SH, Chang HH, Chai WH, Chan PC, Lin CH. Tiotropium/Olodaterol treatment reduces cigarette smoke extract-induced cell death in BEAS-2B bronchial epithelial cells. BMC Pharmacol Toxicol 2020; 21:74. [PMID: 33129351 PMCID: PMC7603690 DOI: 10.1186/s40360-020-00451-0] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/19/2020] [Accepted: 09/29/2020] [Indexed: 01/19/2023] Open
Abstract
BACKGROUND Cigarette smoking is a critical risk factor for the destruction of lung parenchyma or the development of emphysema, which is characteristic of COPD. Disruption of epithelial layer integrity may contribute to lung injury following cigarette smoke extract (CSE) exposure. Tiotropium/olodaterol acts as a bronchodilator for COPD treatment; however, the effect of dual bronchodilators on epithelial cell injury and its underlying mechanism remain unclear. In this study, we evaluated the effect of tiotropium/olodaterol on CSE-mediated cell death and the underlying mechanisms. METHODS Cell viability was determined using the 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide (MTT) assay. Apoptosis, necrosis, and autophagy were evaluated using flow cytometry. Autophagy-related protein, phosphorylated ERK, expression was determined using Western blotting. RESULTS Tiotropium/olodaterol significantly inhibited CSE-induced cell death, mitochondria dysfunction, and autophagy, which had no significant effect on apoptosis or necrosis in BEAS-2B human bronchial epithelial cells. Moreover, tiotropium/olodaterol attenuated CSE-induced upregulation of JNK. CONCLUSIONS CSE induced cell death and caused consistent patterns of autophagy and JNK activation in BEAS-2B human bronchial epithelial cells. Tiotropium/olodaterol treatment protected bronchial epithelial cells from CSE-induced injury and inhibited activation of autophagy and upregulation of JNK phosphorylation. These results indicate that tiotropium/olodaterol may protect epithelial cells from the deleterious effects of CSE exposure, which is associated with the regulation of autophagy and JNK activation.
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Affiliation(s)
- Cheng-Hsiung Chen
- Division of Chest Medicine, Department of Internal Medicine, Changhua Christian Hospital, 135 Nanhsiao Street, Changhua, 50006, Taiwan, Republic of China
| | - Yi-Rong Li
- Changhua Christian Hospital, Thoracic Medicine Research center, Changhua, 50006, Taiwan, Republic of China
| | - Sheng-Hao Lin
- Division of Chest Medicine, Department of Internal Medicine, Changhua Christian Hospital, 135 Nanhsiao Street, Changhua, 50006, Taiwan, Republic of China
- Changhua Christian Hospital, Thoracic Medicine Research center, Changhua, 50006, Taiwan, Republic of China
- Department of Recreation and Holistic Wellness, MingDao University, Changhua, Taiwan, Republic of China
| | - Hsiu-Hui Chang
- Division of Chest Medicine, Department of Internal Medicine, Changhua Christian Hospital, 135 Nanhsiao Street, Changhua, 50006, Taiwan, Republic of China
| | - Woei-Horng Chai
- Division of Chest Medicine, Department of Internal Medicine, Changhua Christian Hospital, 135 Nanhsiao Street, Changhua, 50006, Taiwan, Republic of China
| | - Po-Chiang Chan
- Division of Chest Medicine, Department of Internal Medicine, Changhua Christian Hospital, 135 Nanhsiao Street, Changhua, 50006, Taiwan, Republic of China
| | - Ching-Hsiung Lin
- Division of Chest Medicine, Department of Internal Medicine, Changhua Christian Hospital, 135 Nanhsiao Street, Changhua, 50006, Taiwan, Republic of China.
- Department of Recreation and Holistic Wellness, MingDao University, Changhua, Taiwan, Republic of China.
- Institute of Genomics and Bioinformatics, National Chung Hsing University, Taichung, Taiwan, Republic of China.
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Li J, Ye W, Xu W, Chang T, Zhang L, Ma J, Pei R, He M, Zhou J. Activation of autophagy inhibits epithelial to mesenchymal transition process of human lens epithelial cells induced by high glucose conditions. Cell Signal 2020; 75:109768. [PMID: 32896607 DOI: 10.1016/j.cellsig.2020.109768] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/05/2020] [Revised: 08/27/2020] [Accepted: 08/31/2020] [Indexed: 01/11/2023]
Abstract
Subcapsular cataracts are common phenotype of diabetic cataracts, and abnormal lens epithelial cells (LECs) under the lens capsules have been considered to involve in the pathogenesis. Our previous studies have shown that the epithelial to mesenchymal transition (EMT), which is responsible for the LECs to lose their original polarity and tight junctions, occurs in a diabetic cataract mouse model. Autophagy is known to function in the EMT process in multiple tissues. However, the relationship between autophagy and EMT process in LECs has not yet been fully demonstrated. We found that high glucose retreatment reducing expression level of E-cadherin, an epithelial marker, but increasing that of α-smooth muscle actin (α-SMA), a mesenchymal marker, by Western blot and immunoflurence staining assays, and increased the cell migration by Transwell assay in human lens epithelial cell line HLE-B3. High glucose retreatment also led to impairment of autophagy, representing by downregulation of Beclin, LC3II/LC3I, and reducing the number of autophagosomes. Activation of autophagy by rapamycin could prevent high glucose-induced EMT. In addition, the levels of p62 and Snail were increased in high glucose-treated HLE-B3 cells, and their interactions were demonstrated by co-immunoprecipitation and immunoflurence staining, but all these changes were attenuated by application of rapamycin. These findings delineated a novel autophagy-mediated mechanism, p62 might mediate Snail underlying high glucose-induced EMT in LECs, suggesting a potential therapeutic approach for diabetic cataract by regulating autophagy.
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Affiliation(s)
- Ji Li
- Department of Ophthalmology, Eye Institute of China PLA, Xijing Hospital, The Fourth Military Medical University, No.127 Changle West Road, Xi'an, 710032, Shaanxi, PR China
| | - Wei Ye
- Department of Ophthalmology, Eye Institute of China PLA, Xijing Hospital, The Fourth Military Medical University, No.127 Changle West Road, Xi'an, 710032, Shaanxi, PR China
| | - Wenqin Xu
- The Orbital Disease Institute of the Third Medical Center of PLA General Hospital, 69 Yongding Road, Haidian District, 100039, Beijing, PR China
| | - Tianfang Chang
- Department of Ophthalmology, Eye Institute of China PLA, Xijing Hospital, The Fourth Military Medical University, No.127 Changle West Road, Xi'an, 710032, Shaanxi, PR China
| | - Luning Zhang
- Department of Ophthalmology, Eye Institute of China PLA, Xijing Hospital, The Fourth Military Medical University, No.127 Changle West Road, Xi'an, 710032, Shaanxi, PR China
| | - Jiyuan Ma
- Department of Ophthalmology, Eye Institute of China PLA, Xijing Hospital, The Fourth Military Medical University, No.127 Changle West Road, Xi'an, 710032, Shaanxi, PR China
| | - Rui Pei
- Department of Ophthalmology, Eye Institute of China PLA, Xijing Hospital, The Fourth Military Medical University, No.127 Changle West Road, Xi'an, 710032, Shaanxi, PR China
| | - Mengmei He
- Department of Ophthalmology, Eye Institute of China PLA, Xijing Hospital, The Fourth Military Medical University, No.127 Changle West Road, Xi'an, 710032, Shaanxi, PR China
| | - Jian Zhou
- Department of Ophthalmology, Eye Institute of China PLA, Xijing Hospital, The Fourth Military Medical University, No.127 Changle West Road, Xi'an, 710032, Shaanxi, PR China.
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Hypoxia regulates the degradation of non-nuclear organelles during lens differentiation through activation of HIF1a. Exp Eye Res 2020; 198:108129. [PMID: 32628953 DOI: 10.1016/j.exer.2020.108129] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/24/2020] [Revised: 06/05/2020] [Accepted: 06/23/2020] [Indexed: 12/31/2022]
Abstract
Formation of the eye lens depends on the continuous differentiation of lens epithelial cells into lens fiber cells. To attain their mature structure and transparent function, nascent lens fiber cells must complete a precise cellular remodeling program hallmarked by the complete elimination of organelles to form the core lens organelle-free zone (OFZ). Lacking a blood supply, the lens resides in a hypoxic environment that results in a decreasing oxygen concentration from the lens surface to the lens core. This oxygen gradient results in a hypoxic microenvironment in the region of the lens where immature lens fiber cells initiate loss of organelles to form the core OFZ. These features of the lens suggest a potential role for low lens oxygen levels in the regulation of organelle degradation and other events critical for mature lens fiber cell formation. Hypoxia activates the master regulator of the hypoxic response, hypoxia-inducible factor 1a (HIF1a) that regulates hypoxia-responsive genes. To identify a potential role for hypoxia and HIF1a in the elimination of organelles during lens fiber cell maturation, we tested the requirement for hypoxia in the degradation of non-nuclear organelles in ex vivo cultured embryonic chick lenses by monitoring the degradation of mitochondria (MT), Golgi apparatus (GA) and endoplasmic reticulum (ER) under conditions of low (1% O2) and high (21% O2) oxygen. We also examined the requirement for HIF1a activation for elimination of these organelles under the same conditions using a specific HIF1a activator (DMOG) and a specific HIF1a inhibitor (chetomin) and examined the requirements for hypoxia and HIF1a for regulating transcription of BNIP3L that we previously showed to be required for elimination of non-nuclear lens organelles. We used ChIP-qPCR to confirm direct binding of HIF1a to the 5' untranslated region of the BNIP3L gene. Finally, we examined the effects of expressing an oxygen insensitive mutant form of HIF1a (P402A/P565A) and BNIP3L on non-nuclear organelle degradation. Our data demonstrate that hypoxia and HIF1a are required for the degradation of non-nuclear organelles during lens fiber cell formation and that they regulate this process by governing BNIP3L transcription. Our results also provide evidence that hypoxia and HIF1a are essential for achieving mature lens structure.
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Zhang Y, Zhou S, Cai W, Han G, Li J, Chen M, Li H. Hypoxia/reoxygenation activates the JNK pathway and accelerates synovial senescence. Mol Med Rep 2020; 22:265-276. [PMID: 32377698 PMCID: PMC7248463 DOI: 10.3892/mmr.2020.11102] [Citation(s) in RCA: 18] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/30/2019] [Accepted: 04/06/2020] [Indexed: 12/12/2022] Open
Abstract
Hypoxia/reoxygenation (H/R) may play an important role via senescence in the mechanism of osteoarthritis (OA) development. The synovial membrane is highly sensitive to H/R due to its oxygen consumption feature. Excessive mechanical loads and oxidative stress caused by H/R induce a senescence-associated secretory phenotype (SASP), which is related to the development of OA. The aim of the present study was to investigate the differences of SASP manifestation in synovial tissue masses between tissues from healthy controls and patients with OA. The present study used tumor necrosis factor-α (TNF-α) to pre-treat synovial tissue and fibroblast-like synoviocytes (FLS) to observe the effect of inflammatory cytokines on the synovial membrane before H/R. It was determined that H/R increased interleukin (IL)-1β and IL-6 expression levels in TNF-α-induced cell culture supernatants, increased the proportion of SA-β-gal staining, and increased the expression levels of high mobility group box 1, caspase-8, p16, p21, matrix metalloproteinase (MMP)-3 and MMP-13 in the synovium. Furthermore, H/R opened the mitochondrial permeability transition pore, caused the loss of mitochondrial membrane potential (ΔΨm) and increased the release of reactive oxygen species (ROS). Moreover, H/R caused the expansion of the mitochondrial matrix and rupture of the mitochondrial extracorporeal membrane, with a decrease in the number of cristae. In addition, H/R induced activation of the JNK signaling pathway in FLS to induce cell senescence. Thus, the present results indicated that H/R may cause inflammation and escalate synovial inflammation induced by TNF-α, which may lead to the pathogenesis of OA by increasing changes in synovial SASP and activating the JNK signaling pathway. Therefore, further studies expanding on the understanding of the pathogenesis of H/R etiology in OA are required.
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Affiliation(s)
- Yubiao Zhang
- Department of Orthopedics, Renmin Hospital of Wuhan University, Wuhan, Hubei 430060, P.R. China
| | - Siqi Zhou
- Department of Orthopedics, Renmin Hospital of Wuhan University, Wuhan, Hubei 430060, P.R. China
| | - Weisong Cai
- Department of Orthopedics, Renmin Hospital of Wuhan University, Wuhan, Hubei 430060, P.R. China
| | - Guangtao Han
- Department of Orthopedics, Renmin Hospital of Wuhan University, Wuhan, Hubei 430060, P.R. China
| | - Jianping Li
- Department of Orthopedics, Renmin Hospital of Wuhan University, Wuhan, Hubei 430060, P.R. China
| | - Mao Chen
- Department of Orthopedics, Renmin Hospital of Wuhan University, Wuhan, Hubei 430060, P.R. China
| | - Haohuan Li
- Department of Orthopedics, Renmin Hospital of Wuhan University, Wuhan, Hubei 430060, P.R. China
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COX-2 in liver fibrosis. Clin Chim Acta 2020; 506:196-203. [PMID: 32184095 DOI: 10.1016/j.cca.2020.03.024] [Citation(s) in RCA: 37] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/02/2020] [Revised: 03/13/2020] [Accepted: 03/13/2020] [Indexed: 02/07/2023]
Abstract
As a vital inducible sensor, cyclooxygenase-2 (COX-2) plays an important role in the progress of hepatic fibrogenesis. Activation of hepatic stellate cells (HSCs) in the liver can significantly accelerate the onset and development of liver fibrosis. COX-2 overexpression triggers inflammation that is an important inducer in hepatic fibrosis. Increasing evidence indicates that COX-2 is involved in the main pathogenesis of liver fibrosis, such as inflammation, apoptosis, and cell senescence. Moreover, COX-2 expression is altered in patients and animal models with non-alcoholic fatty liver disease or cirrhosis. These findings suggest that COX-2 has a broad and critical role in the development of liver fibrosis. In this review, we summarize the latest advances in the regulation and signal transduction of COX-2 and its impact on liver fibrosis.
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45
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Zheng Q, Wang YC, Liu QX, Dong XJ, Xie ZX, Liu XH, Gao W, Bai XJ, Li ZF. FK866 attenuates sepsis-induced acute lung injury through c-jun-N-terminal kinase (JNK)-dependent autophagy. Life Sci 2020; 250:117551. [PMID: 32179075 DOI: 10.1016/j.lfs.2020.117551] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/07/2020] [Revised: 03/10/2020] [Accepted: 03/12/2020] [Indexed: 12/12/2022]
Abstract
AIMS Increasing evidence indicates that FK866, a specific noncompetitive nicotinamide phosphoribosyl transferase inhibitor, exhibits a protective effect on acute lung injury (ALI). Autophagy plays a pivotal role in sepsis-induced ALI. However, the contribution of autophagy and the underlying mechanism by which FK866-confered lung protection remains elusive. Herein, we aimed to study whether FK866 could alleviate sepsis-induced ALI via the JNK-dependent autophagy. MAIN METHODS Male C57BL/6 mice were subjected to cecal ligation and puncture (CLP) to establish the polymicrobial sepsis mice model, and treated with FK866 (10 mg/kg) at 24, 12 and 0.5 h before the CLP procedure. The lung protective effects were measured by lung histopathology, tissue edema, vascular leakage, inflammation infiltration, autophagy-related protein expression and JNK activity. A549 cells were stimulated with LPS (1000 ng/ml) to generate the ALI cell model, and pretreated with FK866 or SP600125 for 30 min to measure the autophagy-related protein expression and JNK activity. KEY FINDINGS Our results demonstrated that FK866 reduced lung injury score, tissue edema, vascular leakage, and inflammatory infiltration, and upregulated autophagy. The protective effect of autophagy conferred by FK866 on ALI was further clarified by using 3-methyladenine (3MA) and rapamycin. Additionally, the activity of JNK was suppressed by FK866, and inhibition of JNK promoted autophagy and showed a benefit effect. SIGNIFICANCE Our study indicates that FK866 protects against sepsis-induced ALI by induction of JNK-dependent autophagy. This may provide new insights into the functional mechanism of NAMPT inhibition in sepsis-induced ALI.
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Affiliation(s)
- Qiang Zheng
- Trauma center/Department of Emergency and Traumatic Surgery, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430030, Hubei province, China
| | - Yu-Chang Wang
- Trauma center/Department of Emergency and Traumatic Surgery, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430030, Hubei province, China
| | - Qin-Xin Liu
- Trauma center/Department of Emergency and Traumatic Surgery, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430030, Hubei province, China
| | - Xi-Jie Dong
- Trauma center/Department of Emergency and Traumatic Surgery, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430030, Hubei province, China
| | - Zhen-Xing Xie
- Trauma center/Department of Emergency and Traumatic Surgery, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430030, Hubei province, China
| | - Xing-Hua Liu
- Trauma center/Department of Emergency and Traumatic Surgery, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430030, Hubei province, China
| | - Wei Gao
- Trauma center/Department of Emergency and Traumatic Surgery, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430030, Hubei province, China
| | - Xiang-Jun Bai
- Trauma center/Department of Emergency and Traumatic Surgery, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430030, Hubei province, China
| | - Zhan-Fei Li
- Trauma center/Department of Emergency and Traumatic Surgery, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430030, Hubei province, China.
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Zhang J, Cui WW, Du C, Huang Y, Pi X, Guo W, Wang J, Huang W, Chen D, Li J, Li H, Zhang J, Ma Y, Mu H, Zhang S, Liu M, Cui X, Hu Y. Knockout of DNase1l1l abrogates lens denucleation process and causes cataract in zebrafish. Biochim Biophys Acta Mol Basis Dis 2020; 1866:165724. [PMID: 32061775 DOI: 10.1016/j.bbadis.2020.165724] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/30/2019] [Revised: 02/08/2020] [Accepted: 02/10/2020] [Indexed: 12/21/2022]
Abstract
Removal of nuclei in lens fiber cells is required for organelle-free zone (OFZ) formation during lens development. Defect in degradation of nuclear DNA leads to cataract formation. DNase2β degrades nuclear DNA of lens fiber cells during lens differentiation in mouse. Hsf4 is the principal heat shock transcription factor in lens and facilitates the lens differentiation. Knockout of Hsf4 in mouse and zebrafish resulted in lens developmental defect that was characterized by retaining of nuclei in lens fiber cells. In previous in vitro studies, we found that Hsf4 promoted DNase2β expression in human and mouse lens epithelial cells. In this study, it was found that, instead of DNase2β, DNase1l1l is uniquely expressed in zebrafish lens and was absent in Hsf4-/- zebrafish lens. Using CRISPR-Cas9 technology, a DNase1l1l knockout zebrafish line was constructed, which developed cataract. Deletion of DNase1l1l totally abrogated lens primary and secondary fiber cell denucleation process, whereas had little effect on the clearance of other organelles. The transcriptional regulation of DNase1l1l was dramatically impaired in Hsf4-/- zebrafish lens. Rescue of DNase1l1l mRNA into Hsf4-/- zebrafish embryos alleviated its defect in lens fiber cell denucleation. Our results in vivo demonstrated that DNase1l1l is the primary DNase responsible for nuclear DNA degradation in lens fiber cells, and Hsf4 can transcriptionally activate DNase1l1l expression in zebrafish.
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Affiliation(s)
- Jing Zhang
- Joint National Laboratory for Antibody Drug Engineering, Henan International Union Lab of Antibody Medicine, Henan University School of Medicine, Kaifeng, China
| | - Wen-Wen Cui
- Joint National Laboratory for Antibody Drug Engineering, Henan International Union Lab of Antibody Medicine, Henan University School of Medicine, Kaifeng, China
| | - Chunxiao Du
- Joint National Laboratory for Antibody Drug Engineering, Henan International Union Lab of Antibody Medicine, Henan University School of Medicine, Kaifeng, China
| | - Yuwen Huang
- College of Life Science and Technology, Huazhong University of Science and Technology, Wuhan, Hubei 430074, China
| | - Xiahui Pi
- Joint National Laboratory for Antibody Drug Engineering, Henan International Union Lab of Antibody Medicine, Henan University School of Medicine, Kaifeng, China
| | - Wenya Guo
- Joint National Laboratory for Antibody Drug Engineering, Henan International Union Lab of Antibody Medicine, Henan University School of Medicine, Kaifeng, China
| | - Jungai Wang
- Joint National Laboratory for Antibody Drug Engineering, Henan International Union Lab of Antibody Medicine, Henan University School of Medicine, Kaifeng, China
| | - Weikang Huang
- Joint National Laboratory for Antibody Drug Engineering, Henan International Union Lab of Antibody Medicine, Henan University School of Medicine, Kaifeng, China
| | - Danling Chen
- Joint National Laboratory for Antibody Drug Engineering, Henan International Union Lab of Antibody Medicine, Henan University School of Medicine, Kaifeng, China
| | - Jing Li
- Joint National Laboratory for Antibody Drug Engineering, Henan International Union Lab of Antibody Medicine, Henan University School of Medicine, Kaifeng, China
| | - Hui Li
- Joint National Laboratory for Antibody Drug Engineering, Henan International Union Lab of Antibody Medicine, Henan University School of Medicine, Kaifeng, China
| | - Jun Zhang
- Joint National Laboratory for Antibody Drug Engineering, Henan International Union Lab of Antibody Medicine, Henan University School of Medicine, Kaifeng, China
| | - Yuanfang Ma
- Joint National Laboratory for Antibody Drug Engineering, Henan International Union Lab of Antibody Medicine, Henan University School of Medicine, Kaifeng, China
| | - Hongmei Mu
- Kaifeng Key Lab of Myopia and Cataract, Institute of Eye Disease, Kaifeng Central Hospital, Kaifeng, China
| | - Shuman Zhang
- Huaihe Hospital of Henan University, Kaifeng, China
| | - Mugen Liu
- College of Life Science and Technology, Huazhong University of Science and Technology, Wuhan, Hubei 430074, China
| | - Xiukun Cui
- Joint National Laboratory for Antibody Drug Engineering, Henan International Union Lab of Antibody Medicine, Henan University School of Medicine, Kaifeng, China.
| | - Yanzhong Hu
- Joint National Laboratory for Antibody Drug Engineering, Henan International Union Lab of Antibody Medicine, Henan University School of Medicine, Kaifeng, China; Kaifeng Key Lab of Myopia and Cataract, Institute of Eye Disease, Kaifeng Central Hospital, Kaifeng, China.
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Garg A, Hannan A, Wang Q, Makrides N, Zhong J, Li H, Yoon S, Mao Y, Zhang X. Etv transcription factors functionally diverge from their upstream FGF signaling in lens development. eLife 2020; 9:e51915. [PMID: 32043969 PMCID: PMC7069720 DOI: 10.7554/elife.51915] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/16/2019] [Accepted: 02/10/2020] [Indexed: 12/12/2022] Open
Abstract
The signal regulated transcription factors (SRTFs) control the ultimate transcriptional output of signaling pathways. Here, we examined a family of FGF-induced SRTFs - Etv1, Etv 4, and Etv 5 - in murine lens development. Contrary to FGF receptor mutants that displayed loss of ERK signaling and defective cell differentiation, Etv deficiency augmented ERK phosphorylation without disrupting the normal lens fiber gene expression. Instead, the transitional zone for lens differentiation was shifted anteriorly as a result of reduced Jag1-Notch signaling. We also showed that Etv proteins suppresses mTOR activity by promoting Tsc2 expression, which is necessary for the nuclei clearance in mature lens. These results revealed the functional divergence between Etv and FGF in lens development, demonstrating that these SRTFs can operate outside the confine of their upstream signaling.
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Affiliation(s)
- Ankur Garg
- Department of Ophthalmology, Columbia UniversityNew YorkUnited States
- Department of Pathology and Cell Biology, Columbia UniversityNew YorkUnited States
| | - Abdul Hannan
- Department of Ophthalmology, Columbia UniversityNew YorkUnited States
- Department of Pathology and Cell Biology, Columbia UniversityNew YorkUnited States
| | - Qian Wang
- Department of Ophthalmology, Columbia UniversityNew YorkUnited States
- Department of Pathology and Cell Biology, Columbia UniversityNew YorkUnited States
| | - Neoklis Makrides
- Department of Ophthalmology, Columbia UniversityNew YorkUnited States
- Department of Pathology and Cell Biology, Columbia UniversityNew YorkUnited States
| | - Jian Zhong
- Burke Neurological Institute and Feil Family Brain and Mind Research Institute, Weill Cornell MedicineWhite PlainsUnited States
| | - Hongge Li
- Department of Ophthalmology, Columbia UniversityNew YorkUnited States
- Department of Pathology and Cell Biology, Columbia UniversityNew YorkUnited States
| | - Sungtae Yoon
- Department of Ophthalmology, Columbia UniversityNew YorkUnited States
- Department of Pathology and Cell Biology, Columbia UniversityNew YorkUnited States
| | - Yingyu Mao
- Department of Ophthalmology, Columbia UniversityNew YorkUnited States
- Department of Pathology and Cell Biology, Columbia UniversityNew YorkUnited States
| | - Xin Zhang
- Department of Ophthalmology, Columbia UniversityNew YorkUnited States
- Department of Pathology and Cell Biology, Columbia UniversityNew YorkUnited States
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dos Santos ÍGD, de Oliveira Mendes TA, Silva GAB, Reis AMS, Monteiro-Vitorello CB, Schaker PDC, Herai RH, Fabotti ABC, Coutinho LL, Jorge EC. Didelphis albiventris: an overview of unprecedented transcriptome sequencing of the white-eared opossum. BMC Genomics 2019; 20:866. [PMID: 31730444 PMCID: PMC6858782 DOI: 10.1186/s12864-019-6240-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/20/2019] [Accepted: 10/29/2019] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND The white-eared opossum (Didelphis albiventris) is widely distributed throughout Brazil and South America. It has been used as an animal model for studying different scientific questions ranging from the restoration of degraded green areas to medical aspects of Chagas disease, leishmaniasis and resistance against snake venom. As a marsupial, D. albiventris can also contribute to the understanding of the molecular mechanisms that govern the different stages of organogenesis. Opossum joeys are born after only 13 days, and the final stages of organogenesis occur when the neonates are inside the pouch, depending on lactation. As neither the genome of this opossum species nor its transcriptome has been completely sequenced, the use of D. albiventris as an animal model is limited. In this work, we sequenced the D. albiventris transcriptome by RNA-seq to obtain the first catalogue of differentially expressed (DE) genes and gene ontology (GO) annotations during the neonatal stages of marsupial development. RESULTS The D. albiventris transcriptome was obtained from whole neonates harvested at birth (P0), at 5 days of age (P5) and at 10 days of age (P10). The de novo assembly of these transcripts generated 85,338 transcripts. Approximately 30% of these transcripts could be mapped against the amino acid sequences of M. domestica, the evolutionarily closest relative of D. albiventris to be sequenced thus far. Among the expressed transcripts, 2077 were found to be DE between P0 and P5, 13,780 between P0 and P10, and 1453 between P5 and P10. The enriched GO terms were mainly related to the immune system, blood tissue development and differentiation, vision, hearing, digestion, the CNS and limb development. CONCLUSIONS The elucidation of opossum transcriptomes provides an out-group for better understanding the distinct characteristics associated with the evolution of mammalian species. This study provides the first transcriptome sequences and catalogue of genes for a marsupial species at different neonatal stages, allowing the study of the mechanisms involved in organogenesis.
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Affiliation(s)
- Íria Gabriela Dias dos Santos
- Departamento de Morfologia, Instituto de Ciências Biológicas, Universidade Federal de Minas Gerais, Belo Horizonte, Minas Gerais Brazil
| | | | - Gerluza Aparecida Borges Silva
- Departamento de Morfologia, Instituto de Ciências Biológicas, Universidade Federal de Minas Gerais, Belo Horizonte, Minas Gerais Brazil
| | - Amanda Maria Sena Reis
- Departamento de Morfologia, Instituto de Ciências Biológicas, Universidade Federal de Minas Gerais, Belo Horizonte, Minas Gerais Brazil
| | | | - Patricia Dayane Carvalho Schaker
- Departamento de Genética, Escola Superior de Agricultura Luiz de Queiroz, Universidade de São Paulo, Piracicaba, São Paulo Brazil
| | - Roberto Hirochi Herai
- Graduate Program in Health Sciences, School of Medicine, Pontifícia Universidade Católica do Paraná (PUCPR), Curitiba, Paraná, Brazil
| | | | - Luiz Lehmann Coutinho
- Departamento de Zootecnia, Escola Superior de Agricultura Luiz de Queiroz, Universidade de São Paulo, Piracicaba, São Paulo Brazil
| | - Erika Cristina Jorge
- Departamento de Morfologia, Instituto de Ciências Biológicas, Universidade Federal de Minas Gerais, Belo Horizonte, Minas Gerais Brazil
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49
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Huang L, Yin P, Liu F, Liu Y, Liu Y, Xia Z. Protective effects of L-arginine on the intestinal epithelial barrier under heat stress conditions in rats and IEC-6 cell line. J Anim Physiol Anim Nutr (Berl) 2019; 104:385-396. [PMID: 31709652 DOI: 10.1111/jpn.13246] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/03/2019] [Revised: 09/03/2019] [Accepted: 10/10/2019] [Indexed: 12/13/2022]
Abstract
Heat stress (HS) and the associated restricted blood flow to the intestine have been proven to destroy intestinal integrity. Considering the beneficial properties of L-arginine on gut function, we investigated the protective effects of L-arginine on the intestine under HS conditions. In vivo, the serum cortisol level and the rectal temperature increased in response to HS. Under HS, the intestinal damage showed obvious morphological changes. Furthermore, HS decreased the mRNA and protein expression levels of Nurr1, ZO-1, occludin, claudin-6 and E-cadherin, increased the mRNA expression of NF-κB and IL-1β, and increased the protein expression of cleaved caspase-3. In contrast, L-arginine supplementation maintained intestinal integrity and increased the villus/crypt ratio. L-arginine also suppressed the expression of inflammation-related genes and the protein expression of cleaved caspase-3, whereas it upregulated the mRNA and protein expression of tight junction proteins and LC3B protein expression. In vitro, L-arginine attenuated HS-induced apoptosis as demonstrated by flow cytometry and decreased cleaved caspase-3 protein expression. L-arginine induced autophagy, which was demonstrated by decreased expression of p62 and p-mTOR/mTOR, and increased expression of LC3B. The protein expression levels of TJ proteins also enhanced by L-arginine in IEC-6 cells. Taken together, these results suggest that L-arginine can alleviate intestinal damage and protect the intestinal integrity by suppressing local inflammation response, promoting the production of TJs and facilitating autophagy under HS conditions.
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Affiliation(s)
- Liqing Huang
- College of Veterinary Medicine, China Agricultural University, Beijing, China
| | - Peng Yin
- Institute of Microbiology, Chinese Academy of Sciences, Beijing, China
| | - Fenghua Liu
- College of Animal Science and Technology, Beijing Agricultural University, Beijing, China
| | - Yilin Liu
- College of Animal Science and Technology, Beijing Agricultural University, Beijing, China
| | - Yanhan Liu
- College of Veterinary Medicine, China Agricultural University, Beijing, China
| | - Zhaofei Xia
- College of Veterinary Medicine, China Agricultural University, Beijing, China
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50
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Liu Y, Hou J, Zhang M, Seleh-Zo E, Wang J, Cao B, An X. circ-016910 sponges miR-574-5p to regulate cell physiology and milk synthesis via MAPK and PI3K/AKT-mTOR pathways in GMECs. J Cell Physiol 2019; 235:4198-4216. [PMID: 31663119 PMCID: PMC7028128 DOI: 10.1002/jcp.29370] [Citation(s) in RCA: 30] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/19/2019] [Accepted: 10/07/2019] [Indexed: 12/20/2022]
Abstract
Incremental proofs demonstrate that miRNAs, the essential regulators of gene expression, are implicated in various biological procedures, including mammary development and milk synthesis. Here, the role of miR-574-5p in milk synthesis, apoptosis, and proliferation of goat mammary epithelial cells (GMECs) are explored without precedent, and the molecular mechanisms for the impacts are elucidated. Small RNA libraries were constructed using GMECs transfected with miR-574-5p mimics and negative control followed by sequencing via Solexa technology. Overall, 332 genes were distinguishingly expressed entre two libraries, with 74 genes upregulated and 258 genes downregulated. This approach revealed mitogen-activated protein kinase kinase kinase 9 (MAP3K9), an upstream activator of MAPK signaling, as a differentially expressed unigene. miR-574-5p targeted seed sequences of the MAP3K9 3'-untranslated region and suppressed its messenger RNA (mRNA) and protein levels, correspondingly. GMECs with miR-574-5p overexpression and MAP3K9 inhibition showed increased cell apoptosis and decreased cell proliferation resulting from sustained suppression of MAPK pathways, while MAP3K9 elevation manifested the opposite results. miR-574-5p repressed the phosphorylation of members of protein kinase B (AKT)-mammalian target of rapamycin pathway via downregulating MAP3K9 and AKT3, resulting in reducing the secretion of β-casein and triglycerides in GMECs. Finally, according to the constructed circular RNA (circRNA) libraries and bioinformatics prediction approach, we selected circ-016910 and found it acted as a sponge for miR-574-5p and blocked its relevant behaviors to undertake biological effects in GMECs. The circRNA-miRNA-mRNA network facilitates further probes on the function of miR-574-5p in mammary development and milk synthesis.
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Affiliation(s)
- Yuhan Liu
- College of Animal Science and Technology, Northwest A&F University, Yangling, Shaanxi, China
| | - Jinxing Hou
- Animal Engineering Branch, Yangling Vocational and Technical College, Yangling, Shaanxi, China
| | - Meng Zhang
- College of Animal Science and Technology, Northwest A&F University, Yangling, Shaanxi, China
| | - Emeline Seleh-Zo
- College of Animal Science and Technology, Northwest A&F University, Yangling, Shaanxi, China
| | - Jiangang Wang
- College of Animal Science and Technology, Northwest A&F University, Yangling, Shaanxi, China
| | - Binyun Cao
- College of Animal Science and Technology, Northwest A&F University, Yangling, Shaanxi, China
| | - Xiaopeng An
- College of Animal Science and Technology, Northwest A&F University, Yangling, Shaanxi, China
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