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1.
Acta Pharm Sin B ; 11(9): 2850-2858, 2021 Sep.
Article in English | MEDLINE | ID: covidwho-1415197

ABSTRACT

COVID-19 pandemic caused by SARS-CoV-2 infection severely threatens global health and economic development. No effective antiviral drug is currently available to treat COVID-19 and any other human coronavirus infections. We report herein that a macrolide antibiotic, carrimycin, potently inhibited the cytopathic effects (CPE) and reduced the levels of viral protein and RNA in multiple cell types infected by human coronavirus 229E, OC43, and SARS-CoV-2. Time-of-addition and pseudotype virus infection studies indicated that carrimycin inhibited one or multiple post-entry replication events of human coronavirus infection. In support of this notion, metabolic labelling studies showed that carrimycin significantly inhibited the synthesis of viral RNA. Our studies thus strongly suggest that carrimycin is an antiviral agent against a broad-spectrum of human coronaviruses and its therapeutic efficacy to COVID-19 is currently under clinical investigation.

2.
Acta Pharmaceutica Sinica ; 56(5):1400-1408, 2021.
Article in Chinese | CAB Abstracts | ID: covidwho-1374707

ABSTRACT

Qing-Fei-Pai-Du decoction (QFPDD) is a combination of traditional Chinese medicine and plays an important role in the treatment of coronavirus disease 2019 (COVID-19). This study investigated the inhibitory effect of QFPDD on coronavirus replication and antiviral mechanism. The cytotoxicity of QFPDD was determined by PrestoBlue cell viability assay. Quantitive reverse transcription PCR (qRT-PCR) and immunofluorescence assay (IF) were used to detect the inhibitory effects of QFPDD on coronavirus at RNA and protein levels. qRT-PCR was used to detect the adsorption and penetration of coronavirus after QFPDD treatment. The effects of QFPDD on interferon (IFN) and interferon-stimulated genes (ISGs) were also detected by qRT-PCR. The results showed that QFPDD inhibited coronavirus at RNA and protein levels in a dose-dependent manner at non-toxic concentration, and QFPDD targeted in the early stages of coronavirus infection cycle. Preliminary mechanism studies have shown that QFPDD can directly block the virus entry into the cell by inhibiting virus adsorption, and QFPDD can also play an antiviral role by up-regulating the expression of IFN and ISGs. These results indicate QFPDD as a drug potential to treat coronavirus infection.

3.
Front Psychol ; 12: 664612, 2021.
Article in English | MEDLINE | ID: covidwho-1295694

ABSTRACT

Cyberbullying involvement can lead to internal health issues, especially mental health problems. Different coping strategies may reduce or enhance the strengths between cyberbullying experience and mental health problems. In this study, we examined the correlations between cyberbullying involvement and loneliness among a group of children and adolescents during the Covid-19 pandemic in China, focusing on investigating the protecting effect of the resilient coping strategy. The results demonstrated that 86.68% of the students were not involved in cyberbullying activities, 8.19% were victims only, 1.89% was perpetrators only, and 3.24% were both victims and perpetrators. Compared with the non-involved, the victims-only group had a significantly higher degree of reported loneliness and a lower score of resilient coping, while the differences of the other groups were not significant. Resilient coping strategy can significantly reduce loneliness and play a mediating role between cyberbullying victimization and loneliness, but such mitigating effect was relatively weak. Besides, peer relations were the primary protective factors, and age was the primary risk factor of loneliness among the controlled variables. This study can enrich current knowledge of cyberbullying involvement and the psychological health among children and adolescents, especially in the context of the pandemic.

4.
Engineering ; 2021.
Article in English | ScienceDirect | ID: covidwho-1284079

ABSTRACT

Many microorganisms have mechanisms that protect cells against attack from viruses. The fermentation components of Streptomyces sp. 1647 exhibit potent anti-influenza A virus (IAV) activity. This strain was isolated from soil in southern China in the 1970s, but the chemical nature of its antiviral substance(s) has remained unknown until now. We used an integrated multi-omics strategy to identify the antiviral agents from this streptomycete. The antibiotics and Secondary Metabolite Analysis Shell (antiSMASH) analysis of its genome sequence revealed 38 biosynthetic gene clusters (BGCs) for secondary metabolites, and the target BGCs possibly responsible for the production of antiviral components were narrowed down to three BGCs by bioactivity-guided comparative transcriptomics analysis. Through bioinformatics analysis and genetic manipulation of the regulators and a biosynthetic gene, cluster 36 was identified as the BGC responsible for the biosynthesis of the antiviral compounds. Bioactivity-based molecular networking analysis of mass spectrometric data from different recombinant strains illustrated that the antiviral compounds were a class of structural analogues. Finally, 18 pseudo-tetrapeptides with an internal ureido linkage, omicsynins A1–A6, B1–B6, and C1–C6, were identified and/or isolated from fermentation broth. Among them, 11 compounds (omicsynins A1, A2, A6, B1–B3, B5, B6, C1, C2, and C6) are new compounds. Omicsynins B1–B4 exhibited potent antiviral activity against IAV with the 50% inhibitory concentration (IC50) of approximately 1 µmol∙L–1 and a selectivity index (SI) ranging from 100 to 300. Omicsynins B1–B4 also showed significant antiviral activity against human coronavirus HCoV-229E. By integrating multi-omics data, we discovered a number of novel antiviral pseudo-tetrapeptides produced by Streptomyces sp. 1647, indicating that the secondary metabolites of microorganisms are a valuable source of novel antivirals.

5.
China CDC Wkly ; 3(10): 199-206, 2021 Mar 05.
Article in English | MEDLINE | ID: covidwho-1116445

ABSTRACT

Summary: What is already known about this topic? The coronavirus disease 2019 (COVID-19) pandemic potentially affected prenatal care quality and maternal and fetal outcomes globally.What is added by this report? During COVID-19 pandemic period, the rates of caesarean sections (CS) and preterm birth for uninfected pregnant women increased slightly in areas that were relatively severely impacted by the pandemic in China. The overall number of prenatal examinations did not dramatically decrease, while the eligible examinations significantly decreased in Hubei Province.What are the implications for public health practice? Routine prenatal examinations had been well maintained during the pandemic period in China. In the future, in-time prenatal examinations should be provided to improve the quality of screening and management of high-risk pregnancy under pandemic-affected circumstances. Psychological counseling and transfer treatment channels should be strengthened for pregnant women during lockdown period.

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