1
|
miR-3960 from Mesenchymal Stem Cell-Derived Extracellular Vesicles Inactivates SDC1/Wnt/β-Catenin Axis to Relieve Chondrocyte Injury in Osteoarthritis by Targeting PHLDA2. Stem Cells Int 2022; 2022:9455152. [PMID: 36061148 PMCID: PMC9438433 DOI: 10.1155/2022/9455152] [Citation(s) in RCA: 9] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/16/2021] [Revised: 12/24/2021] [Accepted: 01/26/2022] [Indexed: 01/14/2023] Open
Abstract
Osteoarthritis (OA) is a serious disease of the articular cartilage characterized by excessive inflammation. Lately, mesenchymal stem cell- (MSC-) derived extracellular vesicles (EVs) have been proposed as a novel strategy for the treatment of OA. We aimed to investigate the effects of EV-encapsulated miR-3960 derived from MSCs on chondrocyte injury in OA. The cartilage tissues from OA patients were collected to experimentally determine expression patterns of miR-3960, PHLDA2, SDC1, and β-catenin. Next, luciferase assay was implemented to testify the binding affinity among miR-3960 and PHLDA2. EVs were isolated from MSCs and cocultured with IL-1β-induced OA chondrocytes. Afterwards, cellular biological behaviors and levels of extracellular matrix- (ECM-) related protein anabolic markers (collagen II and aggrecan), catabolic markers (MMP13 and ADAMTS5), and inflammatory factors (IL-6 and TNF-α) in chondrocytes were assayed upon miR-3960 and/or PHLDA2 gain- or loss-of-function. Finally, the effects of miR-3960 contained in MSC-derived EVs in OA mouse models were also explored. MSCs-EVs could reduce IL-1β-induced inflammatory response and extracellular matrix (ECM) degradation in chondrocytes. miR-3960 expression was downregulated in cartilage tissues of OA patients but enriched in MSC-derived EVs. miR-3960 could target and inhibit PHLDA2, which was positively correlated with SDC1 and Wnt/β-catenin pathway activation. miR-3960 shuttled by MSC-derived EVs protected against apoptosis and ECM degradation in chondrocytes. In vivo experiment also confirmed that miR-3960 alleviated chondrocyte injury in OA. Collectively, MSC-derived EV-loaded miR-3960 downregulated PHLDA2 to inhibit chondrocyte injury via SDC1/Wnt/β-catenin.
Collapse
|
2
|
Li Y, Song X, Liu Z, Li Q, Huang M, Su B, Mao Y, Wang Y, Mo W, Chen H. Upregulation of miR-214 Induced Radioresistance of Osteosarcoma by Targeting PHLDA2 via PI3K/Akt Signaling. Front Oncol 2019; 9:298. [PMID: 31058093 PMCID: PMC6482205 DOI: 10.3389/fonc.2019.00298] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/10/2018] [Accepted: 04/01/2019] [Indexed: 01/08/2023] Open
Abstract
Osteosarcoma is an aggressive bone tumor with high resistance to radiotherapy. Pleckstrin homology-like domain family A member 2 (PHLDA2) displays low expression in human osteosarcoma as a proapoptosis factor. miRNAs have been shown to be important in modulating translation and therapeutic responsiveness in solid tumors. Herein, we used luciferase assay to show that miR-214 downregulates the PHLDA2 expression by targeting its 3′-untranslated region (UTR). A high level of miR-214 was identified in tumor tissues from 30 osteosarcoma patients via qPCR analysis, associated positively with lung metastasis. Ectopic expression miR-214 enhanced radioresistance in osteosarcoma cells, with decreased IR-induced apoptosis. Moreover, the depletion of miR-214 enhanced radiosensitivity in both osteosarcoma cells and mouse xenograft models. Importantly, we showed that miR-214 regulated the activation of phosphatidylinositol-3-kinase/Akt signaling pathway by inhibiting PHLDA2. Finally, the introduction of PHLDA2 cDNA lacking the 3′-UTR or treatment with Akt inhibitor LY294002 partially abrogated miR-214-induced radioresistance. In summary, our results reveal that the upregulation of miR-214 as a frequent event in osteosarcoma contributes to radioresistance by regulating the PHLDA2/Akt pathway. The miR-214/PHLDA2/Akt axis provides a new avenue toward understanding the mechanism of radiosensitivity and may be a potential target for osteosarcoma intervention.
Collapse
Affiliation(s)
- Yi Li
- Department of Oncology, 920th Hospital of Joint Logistics Support Force, Kunming, China
| | - Xinmao Song
- Department of Radiation Oncology, Eye, Ear, Nose, and Throat Hospital, FuDan University, Shanghai, China
| | - Zegang Liu
- Department of General Surgery, 920th Hospital of Joint Logistics Support Force, Kunming, China
| | - Qiutian Li
- Department of Oncology, 920th Hospital of Joint Logistics Support Force, Kunming, China
| | - Meijin Huang
- Department of Oncology, 920th Hospital of Joint Logistics Support Force, Kunming, China
| | - Bin Su
- Department of Oncology, 920th Hospital of Joint Logistics Support Force, Kunming, China
| | - Yuchi Mao
- Department of Oncology, 920th Hospital of Joint Logistics Support Force, Kunming, China
| | - Yuanyuan Wang
- Department of Pathology, 920th Hospital of Joint Logistics Support Force, Kunming, China
| | - Wenqian Mo
- Department of Oncology, 920th Hospital of Joint Logistics Support Force, Kunming, China
| | - Hong Chen
- Department of Oncology, 920th Hospital of Joint Logistics Support Force, Kunming, China
| |
Collapse
|
3
|
Selvi RB, Swaminathan A, Chatterjee S, Shanmugam MK, Li F, Ramakrishnan GB, Siveen KS, Chinnathambi A, Zayed ME, Alharbi SA, Basha J, Bhat A, Vasudevan M, Dharmarajan A, Sethi G, Kundu TK. Inhibition of p300 lysine acetyltransferase activity by luteolin reduces tumor growth in head and neck squamous cell carcinoma (HNSCC) xenograft mouse model. Oncotarget 2016; 6:43806-18. [PMID: 26517526 PMCID: PMC4791268 DOI: 10.18632/oncotarget.6245] [Citation(s) in RCA: 39] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/22/2015] [Accepted: 10/14/2015] [Indexed: 01/01/2023] Open
Abstract
Chromatin acetylation is attributed with distinct functional relevance with respect to gene expression in normal and diseased conditions thereby leading to a topical interest in the concept of epigenetic modulators and therapy. We report here the identification and characterization of the acetylation inhibitory potential of an important dietary flavonoid, luteolin. Luteolin was found to inhibit p300 acetyltransferase with competitive binding to the acetyl CoA binding site. Luteolin treatment in a xenografted tumor model of head and neck squamous cell carcinoma (HNSCC), led to a dramatic reduction in tumor growth within 4 weeks corresponding to a decrease in histone acetylation. Cells treated with luteolin exhibit cell cycle arrest and decreased cell migration. Luteolin treatment led to an alteration in gene expression and miRNA profile including up-regulation of p53 induced miR-195/215, let7C; potentially translating into a tumor suppressor function. It also led to down-regulation of oncomiRNAs such as miR-135a, thereby reflecting global changes in the microRNA network. Furthermore, a direct correlation between the inhibition of histone acetylation and gene expression was established using chromatin immunoprecipitation on promoters of differentially expressed genes. A network of dysregulated genes and miRNAs was mapped along with the gene ontology categories, and the effects of luteolin were observed to be potentially at multiple levels: at the level of gene expression, miRNA expression and miRNA processing.
Collapse
Affiliation(s)
- Ruthrotha B Selvi
- Transcription and Disease Laboratory, Molecular Biology and Genetics Unit, Jawaharlal Nehru Centre for Advanced Scientific Research, Jakkur P.O., Jakkur, Bangalore, India
| | - Amrutha Swaminathan
- Transcription and Disease Laboratory, Molecular Biology and Genetics Unit, Jawaharlal Nehru Centre for Advanced Scientific Research, Jakkur P.O., Jakkur, Bangalore, India
| | - Snehajyoti Chatterjee
- Transcription and Disease Laboratory, Molecular Biology and Genetics Unit, Jawaharlal Nehru Centre for Advanced Scientific Research, Jakkur P.O., Jakkur, Bangalore, India
| | - Muthu K Shanmugam
- Department of Pharmacology, Yong Loo Lin School of Medicine, National University of Singapore, Singapore
| | - Feng Li
- Department of Pharmacology, Yong Loo Lin School of Medicine, National University of Singapore, Singapore
| | - Gowsica B Ramakrishnan
- Transcription and Disease Laboratory, Molecular Biology and Genetics Unit, Jawaharlal Nehru Centre for Advanced Scientific Research, Jakkur P.O., Jakkur, Bangalore, India
| | | | - Arunachalam Chinnathambi
- Department of Botany and Microbiology, College of Science, King Saud University, Riyadh, Kingdom of Saudi Arabia
| | - M Emam Zayed
- Department of Botany and Microbiology, College of Science, King Saud University, Riyadh, Kingdom of Saudi Arabia
| | - Sulaiman Ali Alharbi
- Department of Botany and Microbiology, College of Science, King Saud University, Riyadh, Kingdom of Saudi Arabia
| | - Jeelan Basha
- Transcription and Disease Laboratory, Molecular Biology and Genetics Unit, Jawaharlal Nehru Centre for Advanced Scientific Research, Jakkur P.O., Jakkur, Bangalore, India
| | - Akshay Bhat
- Transcription and Disease Laboratory, Molecular Biology and Genetics Unit, Jawaharlal Nehru Centre for Advanced Scientific Research, Jakkur P.O., Jakkur, Bangalore, India
| | | | - Arunasalam Dharmarajan
- School of Biomedical Sciences, CHIRI Biosciences Research Precinct, Curtin University, Bentley, Western Australia, Australia
| | - Gautam Sethi
- Department of Pharmacology, Yong Loo Lin School of Medicine, National University of Singapore, Singapore.,Department of Botany and Microbiology, College of Science, King Saud University, Riyadh, Kingdom of Saudi Arabia.,School of Biomedical Sciences, CHIRI Biosciences Research Precinct, Curtin University, Bentley, Western Australia, Australia
| | - Tapas K Kundu
- Transcription and Disease Laboratory, Molecular Biology and Genetics Unit, Jawaharlal Nehru Centre for Advanced Scientific Research, Jakkur P.O., Jakkur, Bangalore, India
| |
Collapse
|
4
|
Kurzynska-Kokorniak A, Koralewska N, Pokornowska M, Urbanowicz A, Tworak A, Mickiewicz A, Figlerowicz M. The many faces of Dicer: the complexity of the mechanisms regulating Dicer gene expression and enzyme activities. Nucleic Acids Res 2015; 43:4365-80. [PMID: 25883138 PMCID: PMC4482082 DOI: 10.1093/nar/gkv328] [Citation(s) in RCA: 74] [Impact Index Per Article: 8.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/17/2014] [Accepted: 03/31/2015] [Indexed: 12/14/2022] Open
Abstract
There is increasing evidence indicating that the production of small regulatory RNAs is not the only process in which ribonuclease Dicer can participate. For example, it has been demonstrated that this enzyme is also involved in chromatin structure remodelling, inflammation and apoptotic DNA degradation. Moreover, it has become increasingly clear that cellular transcript and protein levels of Dicer must be strictly controlled because even small changes in their accumulation can initiate various pathological processes, including carcinogenesis. Accordingly, in recent years, a number of studies have been performed to identify the factors regulating Dicer gene expression and protein activity. As a result, a large amount of complex and often contradictory data has been generated. None of these data have been subjected to an exhaustive review or critical discussion. This review attempts to fill this gap by summarizing the current knowledge of factors that regulate Dicer gene transcription, primary transcript processing, mRNA translation and enzyme activity. Because of the high complexity of this topic, this review mainly concentrates on human Dicer. This review also focuses on an additional regulatory layer of Dicer activity involving the interactions of protein and RNA factors with Dicer substrates.
Collapse
Affiliation(s)
| | - Natalia Koralewska
- Institute of Bioorganic Chemistry, Polish Academy of Sciences, Poznan 61-704, Poland
| | - Maria Pokornowska
- Institute of Bioorganic Chemistry, Polish Academy of Sciences, Poznan 61-704, Poland
| | - Anna Urbanowicz
- Institute of Bioorganic Chemistry, Polish Academy of Sciences, Poznan 61-704, Poland
| | - Aleksander Tworak
- Institute of Bioorganic Chemistry, Polish Academy of Sciences, Poznan 61-704, Poland
| | - Agnieszka Mickiewicz
- Institute of Bioorganic Chemistry, Polish Academy of Sciences, Poznan 61-704, Poland
| | - Marek Figlerowicz
- Institute of Bioorganic Chemistry, Polish Academy of Sciences, Poznan 61-704, Poland Institute of Computing Science, Poznan University of Technology, Poznan 60-965, Poland
| |
Collapse
|
5
|
Kota SK, Roy Chowdhury D, Rao LK, Padmalatha V, Singh L, Bhadra U. Uncoupling of X-linked gene silencing from XIST binding by DICER1 and chromatin modulation on human inactive X chromosome. Chromosoma 2014; 124:249-62. [PMID: 25428210 DOI: 10.1007/s00412-014-0495-4] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/15/2014] [Revised: 10/24/2014] [Accepted: 11/07/2014] [Indexed: 12/18/2022]
Abstract
In mammals, X-inactivation process is achieved by the cis-spreading of long noncoding Xist RNA over one of the female X chromosomes. The Xist binding accumulates histones H3 methylation and H4 hypoacetylation required for X inactivation that leads to proper dosage compensation of the X-linked genes. Co-transcription of Tsix, an antisense copy of Xist, blocks the Xist coating on the Xi. In mice ES cells, an RNase III enzyme Dicer1 disrupts Xist binding and methylated H3K27me3 accumulation on the Xi. Later, multiple reports opposed these findings raising a question regarding the possible role of Dicer1 in murine X silencing. Here, we show that reduction of DICER1 in human female cells increases XIST transcripts without compromising the binding of the XIST and histone tail modifications on the Xi. Moreover, DICER1-depleted cells show differential upregulation of many human X-linked genes by binding different amounts of acetylated histone predominantly on their active promoter sites. Therefore, X-linked gene silencing, which is thought to be coupled with the accumulation of XIST and heterochromatin markers on Xi can be disrupted in DICER1 depleted human cells. These results suggest that DICER1 has no apparent effect on the recruitment of heterochromatic markers on the Xi but is required for inactivation of differentially regulated genes for the maintenance of proper dosage compensation in differentiated cells.
Collapse
Affiliation(s)
- Satya Keerthi Kota
- Functional Genomics and Gene Silencing Group, Centre For Cellular and Molecular Biology, Uppal Road, Hyderabad, 500 007, India
| | | | | | | | | | | |
Collapse
|
6
|
He L, Wang HY, Zhang L, Huang L, Li JD, Xiong Y, Zhang MY, Jia WH, Yun JP, Luo RZ, Zheng M. Prognostic significance of low DICER expression regulated by miR-130a in cervical cancer. Cell Death Dis 2014; 5:e1205. [PMID: 24787017 PMCID: PMC4047899 DOI: 10.1038/cddis.2014.127] [Citation(s) in RCA: 47] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/27/2013] [Revised: 02/25/2014] [Accepted: 02/28/2014] [Indexed: 12/18/2022]
Abstract
Dicer is crucial for the maturation of microRNAs (miRNAs) and its dysregulation may contribute to tumor initiation and progression. The study explored the clinical implications of Dicer and its post-transcriptional regulation by microRNAs in cervical cancer. qRT-PCR and immunohistochemistry investigated Dicer mRNA and protein levels in cervical cancer tissues. The relationship between Dicer expression and survival was analyzed. MiRNA target prediction identified miRNAs that might target Dicer. Luciferase reporter and gain- or loss-of-function assays were performed. The results showed that 36.7% of cervical cancer cases showed low expression of Dicer mRNA and 63.3% cases showed high expression. At the protein level, 51% cases showed negative expression and 49% cases showed positive expression. Dicer mRNA and protein expressions were significantly associated with distant metastasis and recurrence in cervical cancer (P=0.002 and P=0.012, respectively). Multivariate Cox analysis indicated that low Dicer expression (P=0.016) and tumor stage (P=0.047) were independent predictors. Among the miRNAs predicted to target Dicer, 10 were detected by RT-PCR; their expressions were significantly higher in cervical cancers with lower Dicer expression than in those with higher Dicer expression and were negatively correlated with Dicer expression level (P<0.05). In vitro experiments demonstrated that miR-130a directly targeted Dicer mRNA to enhance migration and invasion in SiHa cells. Finally, survival analysis indicated that higher expression of miR-130a was significantly associated with poor disease-free survival. Taken together, Dicer expression regulated by miR-130a is an important potential prognostic factor in cervical cancer.
Collapse
Affiliation(s)
- L He
- 1] State Key Laboratory of Oncology in Southern China, Sun Yat-Sen University Cancer Center, 651 Dongfeng Road East, Guangzhou 510060, China [2] Department of Gynecology, Sun Yat-Sen University Cancer Center, 651 Dongfeng Road East, Guangzhou 510060, China [3] Department of Obstetrics and Gynecology, The First Affiliated Hospital, Sun Yat-sen University, Guangzhou, China
| | - H-Y Wang
- State Key Laboratory of Oncology in Southern China, Sun Yat-Sen University Cancer Center, 651 Dongfeng Road East, Guangzhou 510060, China
| | - L Zhang
- 1] State Key Laboratory of Oncology in Southern China, Sun Yat-Sen University Cancer Center, 651 Dongfeng Road East, Guangzhou 510060, China [2] Department of Gynecology, Sun Yat-Sen University Cancer Center, 651 Dongfeng Road East, Guangzhou 510060, China
| | - L Huang
- State Key Laboratory of Oncology in Southern China, Sun Yat-Sen University Cancer Center, 651 Dongfeng Road East, Guangzhou 510060, China
| | - J-D Li
- 1] State Key Laboratory of Oncology in Southern China, Sun Yat-Sen University Cancer Center, 651 Dongfeng Road East, Guangzhou 510060, China [2] Department of Gynecology, Sun Yat-Sen University Cancer Center, 651 Dongfeng Road East, Guangzhou 510060, China
| | - Y Xiong
- 1] State Key Laboratory of Oncology in Southern China, Sun Yat-Sen University Cancer Center, 651 Dongfeng Road East, Guangzhou 510060, China [2] Department of Gynecology, Sun Yat-Sen University Cancer Center, 651 Dongfeng Road East, Guangzhou 510060, China
| | - M-Y Zhang
- State Key Laboratory of Oncology in Southern China, Sun Yat-Sen University Cancer Center, 651 Dongfeng Road East, Guangzhou 510060, China
| | - W-H Jia
- State Key Laboratory of Oncology in Southern China, Sun Yat-Sen University Cancer Center, 651 Dongfeng Road East, Guangzhou 510060, China
| | - J-P Yun
- 1] State Key Laboratory of Oncology in Southern China, Sun Yat-Sen University Cancer Center, 651 Dongfeng Road East, Guangzhou 510060, China [2] Department of Pathology, Sun Yat-Sen University Cancer Center, 651 Dongfeng Road East, Guangzhou 510060, China
| | - R-Z Luo
- 1] State Key Laboratory of Oncology in Southern China, Sun Yat-Sen University Cancer Center, 651 Dongfeng Road East, Guangzhou 510060, China [2] Department of Pathology, Sun Yat-Sen University Cancer Center, 651 Dongfeng Road East, Guangzhou 510060, China
| | - M Zheng
- 1] State Key Laboratory of Oncology in Southern China, Sun Yat-Sen University Cancer Center, 651 Dongfeng Road East, Guangzhou 510060, China [2] Department of Gynecology, Sun Yat-Sen University Cancer Center, 651 Dongfeng Road East, Guangzhou 510060, China
| |
Collapse
|
7
|
León K, Gallay N, Poupon A, Reiter E, Dalbies-Tran R, Crepieux P. Integrating microRNAs into the complexity of gonadotropin signaling networks. Front Cell Dev Biol 2013; 1:3. [PMID: 25364708 PMCID: PMC4206998 DOI: 10.3389/fcell.2013.00003] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/15/2013] [Accepted: 12/12/2013] [Indexed: 12/13/2022] Open
Abstract
Follicle-stimulating hormone (FSH) is a master endocrine regulator of mammalian reproductive functions. Hence, it is used to stimulate folliculogenesis in assisted reproductive technologies (ART), both in women and in breeding animals. However, the side effects that hormone administration induces in some instances jeopardize the success of ART. Similarly, the luteinizing hormone (LH) is also of paramount importance in the reproductive function because it regulates steroidogenesis and the LH surge is a pre-requisite to ovulation. Gaining knowledge as extensive as possible on gonadotropin-induced biological responses could certainly lead to precise selection of their effects in vivo by the use of selective agonists at the hormone receptors. Hence, over the years, numerous groups have contributed to decipher the cellular events induced by FSH and LH in their gonadal target cells. Although little is known on the effect of gonadotropins on microRNA expression so far, recent data have highlighted that a microRNA regulatory network is likely to superimpose on the signaling protein network. No doubt that this will dramatically alter our current understanding of the gonadotropin-induced signaling networks. This is the topic of this review to present this additional level of complexity within the gonadotropin signaling network, in the context of recent findings on the microRNA machinery in the gonad.
Collapse
Affiliation(s)
- Kelly León
- BIOS Group, INRA, UMR85, Unité Physiologie de la Reproduction et des Comportements, Nouzilly, France; CNRS, UMR7247, Nouzilly, France; Université François Rabelais Tours, France
| | - Nathalie Gallay
- BIOS Group, INRA, UMR85, Unité Physiologie de la Reproduction et des Comportements, Nouzilly, France; CNRS, UMR7247, Nouzilly, France; Université François Rabelais Tours, France
| | - Anne Poupon
- BIOS Group, INRA, UMR85, Unité Physiologie de la Reproduction et des Comportements, Nouzilly, France; CNRS, UMR7247, Nouzilly, France; Université François Rabelais Tours, France
| | - Eric Reiter
- BIOS Group, INRA, UMR85, Unité Physiologie de la Reproduction et des Comportements, Nouzilly, France; CNRS, UMR7247, Nouzilly, France; Université François Rabelais Tours, France
| | - Rozenn Dalbies-Tran
- BINGO Group, INRA, UMR85, Unité Physiologie de la Reproduction et des Comportements, Nouzilly, France; CNRS, UMR7247, Nouzilly, France; Université François Rabelais Tours, France
| | - Pascale Crepieux
- BIOS Group, INRA, UMR85, Unité Physiologie de la Reproduction et des Comportements, Nouzilly, France; CNRS, UMR7247, Nouzilly, France; Université François Rabelais Tours, France
| |
Collapse
|
8
|
Wu MK, Sabbaghian N, Xu B, Addidou-Kalucki S, Bernard C, Zou D, Reeve AE, Eccles MR, Cole C, Choong CS, Charles A, Tan TY, Iglesias DM, Goodyer PR, Foulkes WD. Biallelic DICER1 mutations occur in Wilms tumours. J Pathol 2013; 230:154-64. [PMID: 23620094 DOI: 10.1002/path.4196] [Citation(s) in RCA: 110] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/15/2013] [Revised: 03/20/2013] [Accepted: 03/29/2013] [Indexed: 12/21/2022]
Abstract
DICER1 is an endoribonuclease central to the generation of microRNAs (miRNAs) and short interfering RNAs (siRNAs). Germline mutations in DICER1 have been associated with a pleiotropic tumour predisposition syndrome and Wilms tumour (WT) is a rare manifestation of this syndrome. Three WTs, each in a child with a deleterious germline DICER1 mutation, were screened for somatic DICER1 mutations and were found to bear specific mutations in either the RNase IIIa (n = 1) or the RNase IIIb domain (n = 2). In the two latter cases, we demonstrate that the germline and somatic DICER1 mutations were in trans, suggesting that the two-hit hypothesis of tumour formation applies for these examples of WT. Among 191 apparently sporadic WTs, we identified five different missense or deletion somatic DICER1 mutations (2.6%) in four individual WTs; one tumour had two very likely deleterious somatic mutations in trans in the RNase IIIb domain (c.5438A>G and c.5452G>A). In vitro studies of two somatic single-base substitutions (c.5429A>G and c.5438A>G) demonstrated exon 25 skipping from the transcript, a phenomenon not previously reported in DICER1. Further we show that DICER1 transcripts lacking exon 25 can be translated in vitro. This study has demonstrated that a subset of WTs exhibits two 'hits' in DICER1, suggesting that these mutations could be key events in the pathogenesis of these tumours.
Collapse
Affiliation(s)
- M K Wu
- Department of Medical Genetics, Lady Davis Institute, Jewish General Hospital, McGill University, Montreal, QC, Canada
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|
9
|
Decreased dicer expression enhances SRP-mediated protein targeting. PLoS One 2013; 8:e56950. [PMID: 23468895 PMCID: PMC3585229 DOI: 10.1371/journal.pone.0056950] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/11/2012] [Accepted: 01/16/2013] [Indexed: 12/29/2022] Open
Abstract
We have shown that Dicer processes 7SL RNA into different fragments ranging from ∼20 to more than 200 nucleotides. Here we addressed the molecular functions of these 7SL RNA fragments and found that some of them functioned as dominant-negative regulators of the full-length 7SL RNA, interfering with signal recognition particle (SRP) complex formation. Transfection of these 7SL RNA fragments inhibited the expression of cell surface glycoproteins, the targeting of a reporter protein to the endoplasmic reticulum, and the secretion of secreted alkaline phosphatase. These results suggest that some Dicer-processed 7SL RNA fragments interfered with SRP-mediated protein targeting. Moreover, we showed that Dicer knockdown enhanced SRP-mediated protein targeting and that transfection of a mixture of the 7SL RNA fragments partially restored this effect. Our data indicate that Dicer can fine-tune the efficiency of SRP-mediated protein targeting via processing a proportion of 7SL RNA into fragments of different lengths.
Collapse
|
10
|
Wu Q, Song R, Ortogero N, Zheng H, Evanoff R, Small CL, Griswold MD, Namekawa SH, Royo H, Turner JM, Yan W. The RNase III enzyme DROSHA is essential for microRNA production and spermatogenesis. J Biol Chem 2012; 287:25173-90. [PMID: 22665486 DOI: 10.1074/jbc.m112.362053] [Citation(s) in RCA: 143] [Impact Index Per Article: 11.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022] Open
Abstract
DROSHA is a nuclear RNase III enzyme responsible for cleaving primary microRNAs (miRNAs) into precursor miRNAs and thus is essential for the biogenesis of canonical miRNAs. DICER is a cytoplasmic RNase III enzyme that not only cleaves precursor miRNAs to produce mature miRNAs but also dissects naturally formed/synthetic double-stranded RNAs to generate small interfering RNAs (siRNAs). To investigate the role of canonical miRNA and/or endogenous siRNA production in spermatogenesis, we generated Drosha or Dicer conditional knock-out (cKO) mouse lines by inactivating Drosha or Dicer exclusively in spermatogenic cells in postnatal testes using the Cre-loxp strategy. Both Drosha and Dicer cKO males were infertile due to disrupted spermatogenesis characterized by depletion of spermatocytes and spermatids leading to oligoteratozoospermia or azoospermia. The developmental course of spermatogenic disruptions was similar at morphological levels between Drosha and Dicer cKO males, but Drosha cKO testes appeared to be more severe in spermatogenic disruptions than Dicer cKO testes. Microarray analyses revealed transcriptomic differences between Drosha- and Dicer-null pachytene spermatocytes or round spermatids. Although levels of sex-linked mRNAs were mildly elevated, meiotic sex chromosome inactivation appeared to have occurred normally. Our data demonstrate that unlike DICER, which is required for the biogenesis of several small RNA species, DROSHA is essential mainly for the canonical miRNA production, and DROSHA-mediated miRNA production is essential for normal spermatogenesis and male fertility.
Collapse
Affiliation(s)
- Qiuxia Wu
- Department of Physiology and Cell Biology, University of Nevada School of Medicine, Reno, Nevada 89557, USA
| | | | | | | | | | | | | | | | | | | | | |
Collapse
|
11
|
Ni MJ, Hu ZH, Liu Q, Liu MF, Lu MH, Zhang JS, Zhang L, Zhang YL. Identification and characterization of a novel non-coding RNA involved in sperm maturation. PLoS One 2011; 6:e26053. [PMID: 22022505 PMCID: PMC3192136 DOI: 10.1371/journal.pone.0026053] [Citation(s) in RCA: 44] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/25/2011] [Accepted: 09/16/2011] [Indexed: 01/06/2023] Open
Abstract
A long and ever-expanding roster of small (∼20–30 nucleotides) RNAs has emerged during the last decade, and most can be subsumed under the three main headings of microRNAs(miRNAs), Piwi-interacting RNAs(piRNAs), and short interferingRNAs(siRNAs). Among the three categories, miRNAs is the most quickly expanded group. The most recent number of identified miRNAs is 16,772 (Sanger miRbase, April 2011). However, there are insufficient publications on their primary forms, and no tissue-specific small RNAs precursors have been reported in the epididymis. Here, we report the identification in rats of an epididymis-specific, chimeric, noncoding RNA that is spliced from two different chromosomes (chromosomes 5 and 19), which we named HongrES2. HongrES2 is a 1.6 kb mRNA-like precursor that gives rise to a new microRNA-like small RNA (mil-HongrES2) in rat epididymis. The generation of mil-HongrES2 is stimulated during epididymitis. An epididymis-specific carboxylesterase named CES7 had 100% cDNA sequence homology at the 3′end with HongrES2 and its protein product could be downregulated by HongrES2 via mil-HongrES2. This was confirmed in vivo by initiating mil-HongrES2 over-expression in rats and observing an effect on sperm capacitation.
Collapse
Affiliation(s)
- Min-Jie Ni
- Shanghai Key Laboratory of Molecular Andrology, State Key Laboratory of Molecular Biology, Shanghai, China
| | - Zhi-Hong Hu
- Shanghai Key Laboratory of Molecular Andrology, State Key Laboratory of Molecular Biology, Shanghai, China
| | - Qiang Liu
- Shanghai Key Laboratory of Molecular Andrology, State Key Laboratory of Molecular Biology, Shanghai, China
| | - Mo-Fang Liu
- Core Facility for Non-Coding RNA, Institute of Biochemistry and Cell Biology, Shanghai Institutes for Biological Sciences, Shanghai, China
| | - Min-hua Lu
- Core Facility for Non-Coding RNA, Institute of Biochemistry and Cell Biology, Shanghai Institutes for Biological Sciences, Shanghai, China
| | - Jin-Song Zhang
- Shanghai Key Laboratory of Molecular Andrology, State Key Laboratory of Molecular Biology, Shanghai, China
| | - Li Zhang
- Shanghai Key Laboratory of Molecular Andrology, State Key Laboratory of Molecular Biology, Shanghai, China
| | - Yong-Lian Zhang
- Shanghai Key Laboratory of Molecular Andrology, State Key Laboratory of Molecular Biology, Shanghai, China
- Shanghai Institute of Planned Parenthood Research, Shanghai, China
- * E-mail:
| |
Collapse
|
12
|
Tang KF, Song GB, Shi YS, Yuan L, Li YH. Dicer knockdown induces fibronectin-1 expression in HEK293T cells via induction of Egr1. Biochim Biophys Acta Gen Subj 2009; 1800:380-4. [PMID: 19914350 DOI: 10.1016/j.bbagen.2009.11.009] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/15/2009] [Revised: 11/04/2009] [Accepted: 11/06/2009] [Indexed: 10/20/2022]
Abstract
BACKGROUND Dicer is a multidomain ribonuclease III enzyme involved in the biogenesis of microRNAs (miRNAs) and small interfering RNAs (siRNAs); depletion of Dicer was found to impair the migration of endothelial cells. METHODS siRNA transfection, cell migration assay, real-time RT-PCR, chromatin immunoprecipitation, Western blotting, ELISA, caspase-3 activity assay, and annexin-V-FITC assay were utilized. RESULTS Knockdown of Dicer impairs the migratory capacity of HEK293T cells and induces fibronectin-1. The upregulation of fibronectin-1 is dependent on Egr1. Fibronectin-1/Dicer double-knockdown cells showed a marked increase in apoptosis compared with fibronectin-1 single knockdown cells. CONCLUSIONS Decreased Dicer expression induces fibronectin-1 expression via an Egr1-dependent manner. GENERAL SIGNIFICANCE Our data suggest that upregulation of fibronectin-1 protects Dicer knockdown HEK293T cells against apoptosis.
Collapse
Affiliation(s)
- Kai-Fu Tang
- Key Laboratory of Biorheological Science and Technology (Chongqing University), Ministry of Education, College of Bioengineering, Chongqing University, Chongqing 400044, PR China
| | | | | | | | | |
Collapse
|
13
|
Shilo S, Roy S, Khanna S, Sen CK. Evidence for the involvement of miRNA in redox regulated angiogenic response of human microvascular endothelial cells. Arterioscler Thromb Vasc Biol 2008; 28:471-7. [PMID: 18258815 DOI: 10.1161/atvbaha.107.160655] [Citation(s) in RCA: 97] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
OBJECTIVE A Dicer knockdown approach was used to test the significance of miRNA in regulating the redox state and angiogenic response of human microvascular endothelial cells (HMECs). METHODS AND RESULTS Lowering of miRNA content by Dicer knockdown induced vascular endothelial growth factor expression but diminished the angiogenic response of HMECs as determined by cell migration and Matrigel tube formation. Such impairment of angiogenic response in the Matrigel was rescued by exogenous low micromolar H2O2. Dicer knockdown HMECs demonstrated lower inducible production of reactive oxygen species (ROS) when activated with either phorbol ester, tumor necrosis factor-alpha, or vascular endothelial growth factor. Limiting the production of ROS by antioxidant treatment or NADPH oxidase knockdown approaches impaired angiogenic responses. Experiments to identify how ROS production is limited by Dicer knockdown identified lower expression of p47phox protein in these cells. This lowering of cellular miRNA content induced expression of the transcription factor HBP1, a suppressor transcription factor that negatively regulates p47phox expression. Knockdown of HBP1 restored the angiogenic response of miRNA-deficient HMECs. CONCLUSIONS This study provides the first evidence that redox signaling in cells is subject to regulation by miRNA. Specifically, p47phox of the NADPH oxidase complex has been identified as one target that regulates the angiogenic properties of endothelial cells.
Collapse
Affiliation(s)
- Shani Shilo
- Comprehensive Wound Center, Department of Surgery, The Ohio State University Medical Center, Columbus, Ohio 43210, USA
| | | | | | | |
Collapse
|