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1.
Stem Cell Res ; 49: 102040, 2020 12.
Artigo em Inglês | MEDLINE | ID: mdl-33099108

RESUMO

We derived an integration-free induced pluripotent stem cell (iPSC) line from the peripheral blood mononuclear cells (PBMCs) of a 23-year-old male patient. This patient carries a 5' splice site point mutation in intron 1 (c.31+1G>A) of the dystrophin gene, a mutation associated with X-linked dilated cardiomyopathy (XLDCM). Sendai virus was used to reprogram the PBMCs and deliver OCT3/4, SOX2, c-MYC, and KLF4 factors. The iPSC line (HKUi002-A) generated preserved the mutation, expressed common pluripotency markers, differentiated into three germ layers in vivo, and exhibited a normal karyotype. Further differentiation into cardiomyocytes enables the study of the disease mechanisms of XLDCM.


Assuntos
Células-Tronco Pluripotentes Induzidas , Adulto , Cardiomiopatia Dilatada , Diferenciação Celular , Genômica , Humanos , Fator 4 Semelhante a Kruppel , Leucócitos Mononucleares , Masculino , Mutação , Miócitos Cardíacos , Adulto Jovem
2.
J Ethnopharmacol ; 209: 236-247, 2017 Sep 14.
Artigo em Inglês | MEDLINE | ID: mdl-28716571

RESUMO

ETHNOPHARMACOLOGICAL RELEVANCE: Yinqiaosan is a classical traditional Chinese medicine formula, which has been used to treat respiratory diseases since ancient China. It consists of nine herbs and among them, Forsythia suspensa (Thunb.) Vahl fruit is one of the major herbal components. Despite the long history of Yinqiaosan, the active compounds and the mechanisms of action of this formula remain elusive. AIM OF THE STUDY: The present study aimed to examine the suppressive effect of Yinqiaosan on influenza virus and to identify the active components in the formula targeting influenza. MATERIALS AND METHODS: Anti-influenza virus effect of Yinqiaosan was assessed by tissue culture infective dose assay, and was also tested in an in vivo mouse model. Active compound from the formula was identified with a bioactivity-guided fractionation scheme. The potential mode of action of the compound was further investigated by identifying the host cell signaling pathways and viral protein production using in vitro cell culture models. RESULTS: Our results showed that forsythoside A from Forsythia suspensa (Thunb.) Vahl fruit, a major herbal component in Yinqiaosan, reduced the viral titers of different influenza virus subtypes in cell cultures and increased the survival rate of the mice in an in vivo influenza virus infection model. Further experiments on the mode of action of forsythoside A showed that it reduced the influenza M1 protein, which in turn intervened the budding process of the newly formed virions and eventually limited the virus spread. CONCLUSION: Results of our present study provides scientific evidence to support to the application of a traditional herbal formula. We also identify novel candidate compound for future drug development against influenza virus.


Assuntos
Forsythia/química , Frutas/química , Glicosídeos/farmacologia , Vírus da Influenza A/efeitos dos fármacos , Infecções por Orthomyxoviridae/virologia , Proteínas da Matriz Viral/metabolismo , Animais , Antivirais/química , Antivirais/uso terapêutico , Linhagem Celular , Cães , Relação Dose-Resposta a Droga , Regulação Viral da Expressão Gênica/efeitos dos fármacos , Glicosídeos/administração & dosagem , Glicosídeos/química , Camundongos , Infecções por Orthomyxoviridae/tratamento farmacológico , Proteínas da Matriz Viral/genética , Cultura de Vírus
3.
Cell Mol Immunol ; 7(4): 263-70, 2010 Jul.
Artigo em Inglês | MEDLINE | ID: mdl-20473322

RESUMO

Historically, influenza pandemics have arisen from avian influenza viruses. Avian influenza viruses H5N1 and H9N2 are potential pandemic candidates. Infection of humans with the highly pathogenic avian influenza H5N1 virus is associated with a mortality in excess of 60%, which has been attributed to dysregulation of the cytokine system. Human macrophages and epithelial cells infected with some genotypes of H5N1 and H9N2 viruses express markedly elevated cytokine and chemokine levels when compared with seasonal influenza A subtype H1N1 virus. The mechanisms underlying this cytokine and chemokine hyperinduction are not fully elucidated. In the present study, we demonstrate that autophagy, a tightly regulated homeostatic process for self-digestion of unwanted cellular subcomponents, plays a role in cytokine induction. Autophagy is induced to a greater extent by H9N2/G1, in association with cytokine hyperinduction, compared with H1N1 and the novel pandemic swine-origin influenza A/H1N1 viruses. Using 3-methyladenine to inhibit autophagy and small interfering RNA to silence the autophagy gene, Atg5, we further show that autophagic responses play a role in influenza virus-induced CXCL10 and interferon-alpha expression in primary human blood macrophages. Our results provide new insights into the pathogenic mechanisms of avian influenza viruses.


Assuntos
Autofagia/imunologia , Quimiocina CXCL10/biossíntese , Vírus da Influenza A/imunologia , Influenza Humana/imunologia , Influenza Humana/virologia , Interferon-alfa/biossíntese , Animais , Proteína 5 Relacionada à Autofagia , Cães , Técnicas de Silenciamento de Genes , Humanos , Vírus da Influenza A Subtipo H1N1/imunologia , Virus da Influenza A Subtipo H5N1/imunologia , Vírus da Influenza A Subtipo H9N2/imunologia , Proteínas Associadas aos Microtúbulos/imunologia , Infecções por Orthomyxoviridae/imunologia , Infecções por Orthomyxoviridae/virologia , RNA Interferente Pequeno/metabolismo
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