Publications

Martelli, Alain; Schmucker, Stéphane; Reutenauer, Laurence; Mathieu, Jacques R. R.; Peyssonnaux, Carole; Karim, Zoubida; Puy, Hervé; Galy, Bruno; Hentze, Matthias W.; Puccio, Hélène

Iron regulatory protein 1 sustains mitochondrial iron loading and function in frataxin deficiency Journal Article

In: Cell Metabolism, vol. 21, no. 2, pp. 311–323, 2015, ISSN: 1932-7420.

Abstract | Links | BibTeX

Fu, Ya-Ru; Liu, Xi-Juan; Li, Xiao-Jun; Shen, Zhang-zhou; Yang, Bo; Wu, Cong-Cong; Li, Jia-Fu; Miao, Ling-Feng; Ye, Han-Qing; Qiao, Guan-Hua; Rayner, Simon; Chavanas, Stéphane; Davrinche, Christian; Britt, William J.; Tang, Qiyi; McVoy, Michael; Mocarski, Edward; Luo, Min-Hua

MicroRNA miR-21 Attenuates Human Cytomegalovirus Replication in Neural Cells by Targeting Cdc25a Journal Article

In: J Virol, vol. 89, no. 2, pp. 1070–1082, 2015, ISSN: 1098-5514.

Abstract | Links | BibTeX

@article{Fu2015,

title = {MicroRNA miR-21 Attenuates Human Cytomegalovirus Replication in Neural Cells by Targeting Cdc25a},

author = {Ya-Ru Fu and Xi-Juan Liu and Xiao-Jun Li and Zhang-zhou Shen and Bo Yang and Cong-Cong Wu and Jia-Fu Li and Ling-Feng Miao and Han-Qing Ye and Guan-Hua Qiao and Simon Rayner and Stéphane Chavanas and Christian Davrinche and William J. Britt and Qiyi Tang and Michael McVoy and Edward Mocarski and Min-Hua Luo},

editor = {R. M. Sandri-Goldin},

doi = {10.1128/jvi.01740-14},

issn = {1098-5514},

year  = {2015},

date = {2015-01-15},

urldate = {2015-01-15},

journal = {J Virol},

volume = {89},

number = {2},

pages = {1070--1082},

publisher = {American Society for Microbiology},

abstract = {<jats:title>ABSTRACT</jats:title><jats:p>Congenital human cytomegalovirus (HCMV) infection is a leading cause of birth defects, primarily manifesting as neurological disorders. HCMV infection alters expression of cellular microRNAs (miRs) and induces cell cycle arrest, which in turn modifies the cellular environment to favor virus replication. Previous observations found that HCMV infection reduces miR-21 expression in neural progenitor/stem cells (NPCs). Here, we show that infection of NPCs and U-251MG cells represses miR-21 while increasing the levels of Cdc25a, a cell cycle regulator and known target of miR-21. These opposing responses to infection prompted an investigation of the relationship between miR-21, Cdc25a, and viral replication. Overexpression of miR-21 in NPCs and U-251MG cells inhibited viral gene expression, genome replication, and production of infectious progeny, while shRNA-knockdown of miR-21 in U-251MG cells increased viral gene expression. In contrast, overexpression of Cdc25a in U-251MG cells increased viral gene expression and production of infectious progeny and overcame the inhibitory effects of miR-21 overexpression. Three viral gene products—IE1, pp71, and UL26—were shown to inhibit miR-21 expression at the transcriptional level. These results suggest that Cdc25a promotes HCMV replication and elevation of Cdc25a levels after HCMV infection are due in part to HCMV-mediated repression of miR-21. Thus, miR-21 is an intrinsic antiviral factor that is modulated by HCMV infection. This suggests a role for miR-21 downregulation in the neuropathogenesis of HCMV infection of the developing CNS.</jats:p><jats:p><jats:bold>IMPORTANCE</jats:bold>Human cytomegalovirus (HCMV) is a ubiquitous pathogen and has very high prevalence among population, especially in China, and congenital HCMV infection is a major cause for birth defects. Elucidating virus-host interactions that govern HCMV replication in neuronal cells is critical to understanding the neuropathogenesis of birth defects resulting from congenital infection. In this study, we confirm that HCMV infection downregulates miR-21 but upregulates Cdc25a. Further determined the negative effects of cellular miRNA miR-21 on HCMV replication in neural progenitor/stem cells and U-251MG glioblastoma/astrocytoma cells. More importantly, our results provide the first evidence that miR-21 negatively regulates HCMV replication by targeting Cdc25a, a vital cell cycle regulator. We further found that viral gene products of IE1, pp71, and UL26 play roles in inhibiting miR-21 expression, which in turn causes increases in Cdc25a and benefits HCMV replication. Thus, miR-21 appears to be an intrinsic antiviral factor that represents a potential target for therapeutic intervention.</jats:p>},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

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ABSTRACTCongenital human cytomegalovirus (HCMV) infection is a leading cause of birth defects, primarily manifesting as neurological disorders. HCMV infection alters expression of cellular microRNAs (miRs) and induces cell cycle arrest, which in turn modifies the cellular environment to favor virus replication. Previous observations found that HCMV infection reduces miR-21 expression in neural progenitor/stem cells (NPCs). Here, we show that infection of NPCs and U-251MG cells represses miR-21 while increasing the levels of Cdc25a, a cell cycle regulator and known target of miR-21. These opposing responses to infection prompted an investigation of the relationship between miR-21, Cdc25a, and viral replication. Overexpression of miR-21 in NPCs and U-251MG cells inhibited viral gene expression, genome replication, and production of infectious progeny, while shRNA-knockdown of miR-21 in U-251MG cells increased viral gene expression. In contrast, overexpression of Cdc25a in U-251MG cells increased viral gene expression and production of infectious progeny and overcame the inhibitory effects of miR-21 overexpression. Three viral gene products—IE1, pp71, and UL26—were shown to inhibit miR-21 expression at the transcriptional level. These results suggest that Cdc25a promotes HCMV replication and elevation of Cdc25a levels after HCMV infection are due in part to HCMV-mediated repression of miR-21. Thus, miR-21 is an intrinsic antiviral factor that is modulated by HCMV infection. This suggests a role for miR-21 downregulation in the neuropathogenesis of HCMV infection of the developing CNS.IMPORTANCEHuman cytomegalovirus (HCMV) is a ubiquitous pathogen and has very high prevalence among population, especially in China, and congenital HCMV infection is a major cause for birth defects. Elucidating virus-host interactions that govern HCMV replication in neuronal cells is critical to understanding the neuropathogenesis of birth defects resulting from congenital infection. In this study, we confirm that HCMV infection downregulates miR-21 but upregulates Cdc25a. Further determined the negative effects of cellular miRNA miR-21 on HCMV replication in neural progenitor/stem cells and U-251MG glioblastoma/astrocytoma cells. More importantly, our results provide the first evidence that miR-21 negatively regulates HCMV replication by targeting Cdc25a, a vital cell cycle regulator. We further found that viral gene products of IE1, pp71, and UL26 play roles in inhibiting miR-21 expression, which in turn causes increases in Cdc25a and benefits HCMV replication. Thus, miR-21 appears to be an intrinsic antiviral factor that represents a potential target for therapeutic intervention.

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Garcia-Perez, J.; Staropoli, I.; Azoulay, S.; Heinrich, J. T.; Cascajero, A.; Colin, P.; Lortat-Jacob, H.; Arenzana-Seisdedos, F.; Alcami, J.; Kellenberger, E.; Lagane, B.

A single-residue change in the HIV-1 V3 loop associated with maraviroc resistance impairs CCR5 binding affinity while increasing replicative capacity Journal Article

In: Retrovirology, vol. 12, pp. 50, 2015, ISSN: 1742-4690 (Electronic) 1742-4690 (Linking).

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