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Li YY, Feng YJ, Wang FJ, Yao XL, Hou WN, Li DX. [Two cases with dilated cardiomyopathy since infancy]. Zhonghua Er Ke Za Zhi 2019; 57:712-714. [PMID: 31530359 DOI: 10.3760/cma.j.issn.0578-1310.2019.09.013] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Affiliation(s)
- Y Y Li
- Department of Vasculocardiology, Children's Hospital Affiliated to Zhengzhou University/Children's Hospital of Henan Province, Zhengzhou 450018, China
| | - Y J Feng
- Department of Vasculocardiology, Children's Hospital Affiliated to Zhengzhou University/Children's Hospital of Henan Province, Zhengzhou 450018, China
| | - F J Wang
- Department of Vasculocardiology, Children's Hospital Affiliated to Zhengzhou University/Children's Hospital of Henan Province, Zhengzhou 450018, China
| | - X L Yao
- Department of Vasculocardiology, Children's Hospital Affiliated to Zhengzhou University/Children's Hospital of Henan Province, Zhengzhou 450018, China
| | - W N Hou
- Department of Vasculocardiology, Children's Hospital Affiliated to Zhengzhou University/Children's Hospital of Henan Province, Zhengzhou 450018, China
| | - D X Li
- Henan Provincial Key Laboratory of Children's Genetics and Metabolic Disease, Children's Hospital Affiliated to Zhengzhou University/Children's Hospital of Henan Province, Zhengzhou 450018, China
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Guo J, Wang L, Hou WN, Bai ST, Sun SK, Sheng GY. [Prognostic significance of coagulation disorders in children with hemophagocytic syndrome]. Zhongguo Dang Dai Er Ke Za Zhi 2014; 16:504-507. [PMID: 24857001] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
OBJECTIVE To study the prognostic significance of coagulation disorders in children with hemophagocytic syndrome (HPS). METHODS Thirty-five children with HPS were retrospectively studied to analyze the etiology, clinical characteristics, laboratory results and treatment outcomes. RESULTS After treatment, 27 of the 35 HPS patients survived, and the other 8 cases died. All cases were treated according to the HLH-2004 protocol, but etoposide (VP-16) was not used in 10 of them. The response rate in patients who received VP-16 (22/25, 88%) was significantly higher than that in those not receiving VP-16 (5/10, 50%) (P<0.05). Compared with the survival group, the dead group had significantly lower platelet count, fibrinogen level, and VP-16 utilization rate (P<0.05) but significantly longer activated partial thromboplastin time and prothrombin time (P<0.05). CONCLUSIONS Coagulation function can be used as an indicator of disease outcome. It is essential for improving the clinical outcome of HPS to monitor the coagulation function during treatment, detect and correct abnormalities in time, and provide treatment strictly according to the HLH-2004 protocol.
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Affiliation(s)
- Jia Guo
- Department of Pediatrics, First Affiliated Hospital of Zhengzhou University, Zhengzhou 450052, China.
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Duan CG, Fang YY, Zhou BJ, Zhao JH, Hou WN, Zhu H, Ding SW, Guo HS. Suppression of Arabidopsis ARGONAUTE1-mediated slicing, transgene-induced RNA silencing, and DNA methylation by distinct domains of the Cucumber mosaic virus 2b protein. Plant Cell 2012; 24:259-74. [PMID: 22247253 PMCID: PMC3289565 DOI: 10.1105/tpc.111.092718] [Citation(s) in RCA: 140] [Impact Index Per Article: 11.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/15/2011] [Revised: 11/23/2011] [Accepted: 12/21/2011] [Indexed: 05/18/2023]
Abstract
Unique among the known plant and animal viral suppressors of RNA silencing, the 2b protein interacts directly with both small interfering RNA (siRNA) and ARGONAUTE1 (AGO1) and AGO4 proteins and is targeted to the nucleolus. However, it is largely unknown which regions of the 111-residue 2b protein determine these biochemical properties and how they contribute to its diverse silencing suppressor activities. Here, we identified a functional nucleolar localization signal encoded within the 61-amino acid N-terminal double-stranded RNA (dsRNA) binding domain (dsRBD) that exhibited high affinity for short and long dsRNA. However, physical interaction of 2b with AGOs required an essential 33-residue region C-terminal to the dsRBD and was sufficient to inhibit the in vitro AGO1 Slicer activity independently of its dsRNA binding activities. Furthermore, the direct 2b-AGO interaction was not essential for the 2b suppression of posttranscriptional gene silencing (PTGS) and RNA-directed DNA methylation (RdDM) in vivo. Lastly, we found that the 2b-AGO interactions in vivo also required the nucleolar targeting of 2b and had the potential to redistribute both the 2b and AGO proteins in nucleus. These findings together suggest that 2b may suppress PTGS and RdDM in vivo by binding and sequestering siRNA and the long dsRNA precursor in a process that is facilitated by its interactions with AGOs in the nucleolus.
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Affiliation(s)
- Cheng-Guo Duan
- State Key Laboratory of Plant Genomics and National Center for Plant Gene Research, Institute of Microbiology, Chinese Academy of Sciences, Beijing 100101, China
| | - Yuan-Yuan Fang
- State Key Laboratory of Plant Genomics and National Center for Plant Gene Research, Institute of Microbiology, Chinese Academy of Sciences, Beijing 100101, China
| | - Bang-Jun Zhou
- State Key Laboratory of Plant Genomics and National Center for Plant Gene Research, Institute of Microbiology, Chinese Academy of Sciences, Beijing 100101, China
- Graduate University of Chinese Academy of Sciences, Beijing 100049, China
| | - Jian-Hua Zhao
- State Key Laboratory of Plant Genomics and National Center for Plant Gene Research, Institute of Microbiology, Chinese Academy of Sciences, Beijing 100101, China
- Graduate University of Chinese Academy of Sciences, Beijing 100049, China
| | - Wei-Na Hou
- State Key Laboratory of Plant Genomics and National Center for Plant Gene Research, Institute of Microbiology, Chinese Academy of Sciences, Beijing 100101, China
| | - Hui Zhu
- State Key Laboratory of Plant Genomics and National Center for Plant Gene Research, Institute of Microbiology, Chinese Academy of Sciences, Beijing 100101, China
- Graduate University of Chinese Academy of Sciences, Beijing 100049, China
| | - Shou-Wei Ding
- Department of Plant Pathology and Microbiology, University of California, Riverside, California 92521
| | - Hui-Shan Guo
- State Key Laboratory of Plant Genomics and National Center for Plant Gene Research, Institute of Microbiology, Chinese Academy of Sciences, Beijing 100101, China
- Address correspondence to
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Zhu H, Duan CG, Hou WN, Du QS, Lv DQ, Fang RX, Guo HS. Satellite RNA-derived small interfering RNA satsiR-12 targeting the 3' untranslated region of Cucumber mosaic virus triggers viral RNAs for degradation. J Virol 2011; 85:13384-97. [PMID: 21994448 PMCID: PMC3233178 DOI: 10.1128/jvi.05806-11] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/27/2011] [Accepted: 10/03/2011] [Indexed: 11/20/2022] Open
Abstract
RNA silencing provides protection against RNA viruses by targeting both the helper virus and its satellite RNA (satRNA). Virus-derived small interfering RNAs (vsiRNAs) bound with Argonaute (AGO) proteins are presumed participants in the silencing process. Here, we show that a vsiRNA targeted to virus RNAs triggers the host RNA-dependent RNA polymerase 6 (RDR6)-mediated degradation of viral RNAs. We confirmed that satRNA-derived small interfering RNAs (satsiRNAs) could be associated with different AGO proteins in planta. The most frequently cloned satsiRNA, satsiR-12, was predicted to imperfectly match to Cucumber mosaic virus (CMV) RNAs in the upstream area of the 3' untranslated region (3' UTR). Moreover, an artificial satsiR-12 (asatsiR-12) mediated cleavage of a green fluorescent protein (GFP) sensor construct harboring the satsiR-12 target site. asatsiR-12 also mediated reduction of viral RNAs in 2b-deficient CMV (CMVΔ2b)-infected Nicotiana benthamiana. The reduction was not observed in CMVΔ2b-infected RDR6i plants, in which RDR6 was silenced. Following infection with 2b-containing CMV, the reduction in viral RNAs was not observed in plants of either genotype, indicating that the asatsiR-12-mediated reduction of viral RNAs in the presence of RDR6 was inhibited by the 2b protein. Our results suggest that satsiR-12 targeting the 3' UTR of CMV RNAs triggered RDR6-dependent antiviral silencing. Competition experiments with wild-type CMV RNAs and anti-satsiR-12 mutant RNA1 in the presence of 2b and satRNA demonstrate the inhibitory effect of the 2b protein on the satsiR-12-related degradation of CMV RNAs, revealing a substantial suppressor function of the 2b protein in native CMV infection. Our data provide evidence for the important biological functions of satsiRNAs in homeostatic interactions among the host, virus, and satRNA in the final outcome of viral infection.
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Affiliation(s)
- Hui Zhu
- State Key Laboratory of Plant Genomics and National Center for Plant Gene Research (Beijing), Institute of Microbiology, Chinese Academy of Sciences, Beijing 100101, China
- Graduate University of Chinese Academy of Sciences, Beijing 100049, China
| | - Cheng-Guo Duan
- State Key Laboratory of Plant Genomics and National Center for Plant Gene Research (Beijing), Institute of Microbiology, Chinese Academy of Sciences, Beijing 100101, China
| | - Wei-Na Hou
- State Key Laboratory of Plant Genomics and National Center for Plant Gene Research (Beijing), Institute of Microbiology, Chinese Academy of Sciences, Beijing 100101, China
| | - Quan-Sheng Du
- State Key Laboratory of Plant Genomics and National Center for Plant Gene Research (Beijing), Institute of Microbiology, Chinese Academy of Sciences, Beijing 100101, China
| | - Dian-Qiu Lv
- State Key Laboratory of Plant Genomics and National Center for Plant Gene Research (Beijing), Institute of Microbiology, Chinese Academy of Sciences, Beijing 100101, China
- Virus-Free Seeding Institute of Heilongjiang Academy of Agricultural Sciences, Heilongjiang 150086, Haerbin, China
| | - Rong-Xiang Fang
- State Key Laboratory of Plant Genomics and National Center for Plant Gene Research (Beijing), Institute of Microbiology, Chinese Academy of Sciences, Beijing 100101, China
| | - Hui-Shan Guo
- State Key Laboratory of Plant Genomics and National Center for Plant Gene Research (Beijing), Institute of Microbiology, Chinese Academy of Sciences, Beijing 100101, China
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Hou WN, Duan CG, Fang RX, Zhou XY, Guo HS. Satellite RNA reduces expression of the 2b suppressor protein resulting in the attenuation of symptoms caused by Cucumber mosaic virus infection. Mol Plant Pathol 2011; 12:595-605. [PMID: 21722297 PMCID: PMC6640352 DOI: 10.1111/j.1364-3703.2010.00696.x] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/05/2023]
Abstract
Satellite RNAs (satRNAs) depend on cognate helper viruses for replication, encapsidation, movement and transmission. Many satRNAs with different symptom modulation effects have been reported. The pathogenicity of satRNAs is thought to be the result of a direct interaction among the satRNA, helper viruses and host factors by unknown mechanisms. To understand the effect of satRNA of Cucumber mosaic virus (a severe field ShanDong strain, SD-CMV) on pathogenicity, and the possible involvement of host RNA silencing pathways in pathogenicity, we constructed biologically active CMV cDNA clones and a CMV-Δ2b mutant lacking the open reading frame of 2b, a silencing suppressor protein, in order to infect Nicotiana benthamiana and Arabidopsis with or without SD-satRNA. We found that SD-satRNA reduced the accumulation of the 2b protein and its coding RNA4A and attenuated the yellowing caused by SD-CMV infection. Small RNA analysis indicated that the 2b protein interfered with RNA silencing, specifically in the synthesis of CMV RNA3-derived small interfering RNAs (R3-siRNAs). The accumulation of R3-siRNAs in CMV-Δ2b infection was reduced in the presence of satRNA, for which greater accumulation of satRNA-derived siRNAs (satsiRNAs) was detected. Our results suggest that abundant SD-satRNA serving as target for RNA silencing may play a role in protecting helper CMV RNA, especially, subgenomic RNA4, from being targeted by RNA silencing. This compensates for the increase in RNA silencing resulting from the reduction in expression of the 2b suppressor in the presence of satRNA. Our data provide evidence that a plant silencing mechanism is involved in the pathogenicity of satRNA.
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Affiliation(s)
- Wei-Na Hou
- State Key Laboratory of Plant Genomics and National Center for Plant Gene Research (Beijing), Institute of Microbiology, Chinese Academy of Sciences, China
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