Publications by authors named "Liju Song"

10 Publications

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Anti-inflammatory and antibacterial activities of Pyrrosia petiolosa ethyl acetate (PPEAE) against Staphylococcus aureus in mice.

Pak J Pharm Sci 2021 Mar;34(2):493-498

Key Laboratory of Bio-Resource and Eco-Environment of Ministry of Education, College of Life Sciences, Sichuan University, Chengdu, Sichuan, P.R. China.

P. petiolosa as a typical Chinese herbal medicine has been generally utilized as Chinese native medicine formulation for treatment of chronic bronchitis, bronchial asthma and pneumoconiosis. The objective of this study was to evaluate the anti-inflammatory and antibacterial activities of P. petiolosa ethyl acetate extract (PPEAE) against S. aureusin mice. In our study, mice were infected pneumonia by S. aureus, colonization of S. aureus in lung tissue was calculated and the number of white blood cells (WBC) in blood was measured. Meanwhile, the hematoxylin-eosin staining (H&E) was observed and the Real-time PCR was employed to determine the relative mRNA expression. The results showed that, after treated with PPEAE the wet/dry (W/D) weight ratio and the number of WBC decreased dramatically, the number of S. aureus was significantly reduced. Furthermore, H&E staining showed that PPEAE obviously relieved the inflammation of infected mice and real-time PCR results indicated that PPEAE significantly down regulated the inflammatory iNOS, TNF-α and up regulated the anti-inflammatory HO-1 mRNA. In summary, our study revealed that application of crude product PPEAE had prominent antibacterial activity against S. aureus. PPEAE significantly reduced the biomass of S. aureus and effectively relieved the inflammation of S. aureus-induced pneumonia.
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March 2021

Life History Recorded in the Vagino-cervical Microbiome Along with Multi-omics.

Genomics Proteomics Bioinformatics 2021 Jun 9. Epub 2021 Jun 9.

BGI-Shenzhen, Shenzhen 518083, China.

The vagina contains at least a billion microbial cells, dominated by lactobacilli. Here we perform metagenomic shotgun sequencing on cervical and fecal samples from a cohort of 516 Chinese women of reproductive age, and cervical, fecal, and salivary samples from a second cohort of 632 women. Factors such as pregnancy, delivery histories, cesarean section, and breast-feeding were all more important than menstrual cycle in shaping the microbiome, and such information would be necessary before trying to interpret differences between vagino-cervical microbiome data. Greater proportion of Bifidobacterium breve was seen with older age at sexual debut. The relative abundance of lactobacilli especially Lactobacillus crispatus was negatively associated with pregnancy history. Potential markers for lack of menstrual regularity, heavy flow, dysmenorrhea, and contraceptives were also identified. Lactobacilli were rare during breast-feeding or post-menopause. Other features such as mood fluctuations and facial speckles could potentially be predicted from the vagino-cervical microbiome. Gut and salivary microbiome, plasma vitamins, metals, amino acids, and hormones showed associations with the vagino-cervical microbiome. Our results offer an unprecedented glimpse into the microbiota of the female reproductive tract and call for international collaborations to better understand its long-term health impact other than in the settings of infection or pre-term birth.
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http://dx.doi.org/10.1016/j.gpb.2021.01.005DOI Listing
June 2021

Anti-inflammatory and antibacterial activities of P. petiolosa (Christ) Ching ethyl acetate extract against S. aureus in mice.

Pak J Pharm Sci 2020 Sep;33(5):2047-2052

Key Laboratory of Bio-Resource and Eco-Environment of Ministry of Education, College of Life Sciences, Sichuan University, Chengdu, Sichuan, P.R. China.

P. petiolosa as a typical Chinese herbal medicine has been generally utilized as Chinese native medicine formulation for treatment of chronic bronchitis, bronchial asthma and pneumoconiosis. The objective of this study was to evaluate the anti-inflammatory and antibacterial activities of P. petiolosa ethyl acetate extract (PPEAE) against S. aureus in mice. The air-dried leaves were extracted with ethyl acetate, mice were infected pneumonia by S. aureus. Colonization of S. aureus in lung tissue was calculated by plate colony count. The number of white blood cells (WBC) in blood was measured by blood cell automatic analyzer. The histopathological analysis of hematoxylin-eosin staining (H&E) of lung tissue was observed under microscope. Real-time PCR assay was employed to determine the relative mRNA expression of HO-1, iNOS and TNF-α. The results showed that, compared with control, after treated with PPEAE the wet/dry (W/D) weight ratio of mice lung tissue (decreased from 5.371 to 4.9) and the number of white blood cells (WBC) (decreased by 3.13×10/mL) decreased dramatically. The number of S. aureus was significantly reduced (from 1.93×105 CFU/mL to 26×103 CFU/mL) in lung tissue after treated with PPEAE. Furthermore, H&E staining showed that PPEAE obviously relieved the inflammation of lung tissue of infected mice. Meanwhile, real-time PCR results indicated that PPEAE down regulated the expression of inflammatory iNOS, TNF-α mRNA and up regulated the expression of anti-inflammatory HO-1 mRNA. In summary, this study revealed that application of crude product PPEAE had prominent antibacterial activity against S. aureus. PPEAE significantly reduced the biomass of S. aureus in lung tissue and effectively relieved the inflammation of S. aureus-induced pneumonia.
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September 2020

The metagenome of the female upper reproductive tract.

Gigascience 2018 10 1;7(10). Epub 2018 Oct 1.

BGI-Shenzhen, Shenzhen 518083, China.

Background: The human uterus is traditionally believed to be sterile, while the vaginal microbiota plays an important role in fending off pathogens. Emerging evidence demonstrates the presence of bacteria beyond the vagina. However, a microbiome-wide metagenomic analysis characterizing the diverse microbial communities has been lacking.

Results: We performed shotgun-sequencing of 52 samples from the cervical canal and the peritoneal fluid of Chinese women of reproductive age using the Illumina platform. Direct annotation of sequencing reads identified the taxonomy of bacteria, archaea, fungi and viruses, confirming and extending the results from our previous study. We replicated our previous findings in another 24 samples from the vagina, the cervical canal, the uterus and the peritoneal fluid using the BGISEQ-500 platform revealing that microorganisms in the samples from the same individuals were largely shared in the entire reproductive tract. Human sequences made up more than 99% of the 20GB raw data. After filtering, vaginal microorganisms were well covered in the generated reproductive tract gene catalogue, while the more diverse upper reproductive tract microbiota would require greater depth of sequencing and more samples to meet the full coverage scale.

Conclusions: We provide novel detailed data on the microbial composition of a largely unchartered body site, the female reproductive tract. Our results indicated the presence of an intra-individual continuum of microorganisms that gradually changed from the vagina to the peritoneal fluid. This study also provides a framework for understanding the implications of the composition and functional potential of the distinct microbial ecosystems of the female reproductive tract in relation to health and disease.
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http://dx.doi.org/10.1093/gigascience/giy107DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6177736PMC
October 2018

KH-type splicing regulatory protein mediate inflammatory response in gastric epithelial cells induced by lipopolysaccharide.

Cell Biol Int 2017 Aug 6;41(8):871-878. Epub 2017 Jul 6.

Key Laboratory of Biological Resource and Ecological Environment of Chinese Education Ministry, College of Life Science, Sichuan University, Chengdu, 610064, P.R. China.

To study differential expressions of KH-type splicing regulatory protein (KSRP) and inflammatory factors and to explore the relationship between them in Lipopolysaccharide (LPS)-induced gastric epithelial cells (GES-1), cells were exposed to LPS for 24 h in the presence or absence of SC-514. Western blot and real-time PCR (RT-PCR) were used to analysis the contents of KSRP, inducible NO synthase (iNOS) and cyclooxygenase-2 (COX-2). The results showed that LPS decreased the expression of KSRP protein in GES-1 cells, but not KSRP mRNA, while increasing the levels of iNOS and COX-2 proteins and mRNAs in GES-1cells. High expression of KSRP induced low expressions and stabilities of iNOS and COX-2 in GES-1 cells, indicated that KSRP protein presented negative correlation with iNOS and COX-2 with LPS stimulation. In conclusion, the regulation of expression of KSRP was mainly achieved through post-translational modification. KSRP protein participated in regulating the expression of iNOS and COX-2 in their transcription and translation levels. In response to LPS or gram negative pathogenic microorganism, KSRP could regulate Toll-like receptor (TLR)/ Nuclear factor-kappa B (NF-κB) signal pathway in GES-1 cells.
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http://dx.doi.org/10.1002/cbin.10804DOI Listing
August 2017

A Vector-Based Short Hairpin RNA Targeting Aurora B Suppresses Human Prostatic Carcinoma Growth.

Technol Cancer Res Treat 2017 02 17;16(1):112-119. Epub 2016 Oct 17.

1 Key Laboratory of Biological Resource and Ecological Environment of Chinese Education Ministry, College of Life Sciences, Sichuan University, Chengdu, People's Republic of China.

Aurora kinase B, playing a vital, important role in mitosis, is frequently detected to be overexpressed in many cancer cell lines and various tumor tissues, including prostatic carcinoma. Given the essential function of Aurora kinase B in mitosis and its association with tumorigenesis, it might be a drug target for prostatic carcinoma treatment. In our study, short hairpin RNA targeting Aurora kinase B was cloned into a pGPU6 plasmid vector and then transfected into human prostatic carcinoma cells. The expression level of Aurora kinase B was verified by reverse transcription-polymerase chain reaction and Western blot. At the same time, cell apoptosis was detected by 3-(4,5-dimethyl-2-thiazolyl)-2,5-diphenyl-2H-tetrazolium bromide, fluorescent staining, and flow cytometric analysis. Furthermore, prostate carcinoma cells were injected into mice to establish a tumor xenograft model. Previous studies have shown the effect of pGPU6-shAURKB plasmid on tumor growth in a prostate carcinoma xenogenic implantation model. From the study, we knew that the Aurora kinase B was significantly downregulated in prostate carcinoma cells, and cell apoptosis was also detected higher in treated groups than that in control groups. Moreover, in the prostate carcinoma xenogenic implantation model, compared with the control groups, the tumor growth was inhibited about 78.7% in the pGPU6-shAURKB plasmid-treated group, and cell apoptosis in the experimental group was notably higher than that in control groups. The average duration of tumor-bearing mice was prolonged to about 35 days. The results of experiment indicated that specific knockdown of Aurora kinase B led to prostate carcinoma cells apoptosis and inhibited tumor growth. Our data clearly confirmed that specific knockdown of Aurora kinase B expression by vector-based short hairpin RNA/liposome may be a potential new approach to treat human prostatic carcinoma.
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http://dx.doi.org/10.1177/1533034616673534DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5616121PMC
February 2017

The effect of trimethylamine N-oxide on Helicobacter pylori-induced changes of immunoinflammatory genes expression in gastric epithelial cells.

Int Immunopharmacol 2017 Feb 22;43:172-178. Epub 2016 Dec 22.

Key Laboratory of Biological Resource and Ecological Environment of Chinese Education Ministry, College of Life Sciences, Sichuan University, Chengdu 610064, PR China. Electronic address:

Colonization of Helicobacter pylori (H. pylori) induces immune and inflammatory response in gastric mucosa. Trimethylamine N-oxide (TMAO), from diet and metabolite through the action of gut microbiota, has been linked to inflammatory diseases. To investigate the effects of TMAO and H. pylori infection on gene expression in gastric epithelial cells, Human gene chip Affymetrix HTA 2.0 was used in this study. 1312 genes were identified as differentially expressed genes in GES-1 cells with H. pylori and TMAO co-treatment compared to the control. GO and KEGG analyses indicated that the functions of these differentially expressed genes were related closely with immune inflammation. GO-network showed that Toll-like receptor signaling pathway was the most important biological processes and 49 up-regulated genes related to immune inflammation were obtained. The synergistic effects of H. pylori and TMAO enhanced the genes expression of IL-6, CXCL1, CXCL2, FOS and C3 related to immune inflammation in comparison with those of non-infected control cells, H. pylori-infected cells, and TMAO-stimulated cells. RT-PCR verified the expression levels of IL-6, CXCL1. Additionally, expression levels of 2053 genes were altered and 52 immunoinflammatory genes were upregulated in comparison with H. pylori-infected cells. This study suggested that TMAO altered the expression levels of immunoinflammatory genes induced by H. pylori infection, and the synergistic effects of H. pylori and TMAO provided novel insights into the development of chronic gastritis, gastric ulcer and gastric cancer.
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http://dx.doi.org/10.1016/j.intimp.2016.11.032DOI Listing
February 2017

The biological activity of cationic liposomes in drug delivery and toxicity test in animal models.

Environ Toxicol Pharmacol 2016 Oct 26;47:159-164. Epub 2016 Sep 26.

Key Laboratory of Biological Resource and Ecological Environment of Chinese Education Ministry, College of Life Science, Sichuan University, Chengdu 610064, PR China. Electronic address:

In the study we made use of DOTAP (1,2-dioleoyl-3-trimethylammonium), DOPE (1,2-dioleoyl-snglycero-3-phosphoethanolamine) and PEG-PE (polyethylene glycol- polyethylene) to make cationic PEG-liposomes by ultrasonic dispersion method. The plasmid pGPU6 combined with cationic PEG-liposomes or Liopofectamin 2000 was used to transfect PC3 cells to judge the transfection efficiency. HE staining showed that the pGUP6-shAurora B plasmid/liposomes complex could significantly inhibit tumor growth in mice tumor model. The results indicated that there was no remarkable difference between the homemade liposomes and Lipofectamin 2000 after transfection, with transfection efficiency over 80%. And the homemade liposomes also had high transfection efficiency in vivo. No significant side effects were observed on weight, coat condition, behavior or appetite and the life span of mice treated with pGPU6-shAurora B were extended. Beyond that, there were no differences in mortality or in pathological changes to the heart, liver, spleen, lungs and kidneys among all the mice.
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http://dx.doi.org/10.1016/j.etap.2016.09.015DOI Listing
October 2016

Antibacterial activity of Pyrrosia petiolosa ethyl acetate extract against Staphylococcus aureus by decreasing hla and sea virulence genes.

Nat Prod Res 2017 Jun 26;31(11):1347-1350. Epub 2016 Oct 26.

a Key Laboratory of Biological Resource and Ecological Environment of Chinese Education Ministry , College of Life Sciences, Sichuan University , Chengdu , P.R. China.

The aim of this study was to explore the antibacterial activity of Pyrrosia petiolosa ethyl acetate extract (PPEAE) against Staphylococcus aureus in vitro and analyse its chemical components by gas chromatograph-mass spectrometry. The results of anti-microbial assay revealed that PPEAE had strong inhibitory activity against S .aureus, with MIC and MBC of 7.8 and 15.6 mg/mL, respectively. The transcriptional levels of hla and sea were reduced to 14.33 and 46.39% at the MIC compared to the control. Analysing test result exhibited that eugenol made a great contribution to antibacterial activity. This experiment indicated that PPEAE had prominent antibacterial activity against S. aureus.
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http://dx.doi.org/10.1080/14786419.2016.1244201DOI Listing
June 2017

The contribution of toll-like receptor 2 on Helicobacter pylori activation of the nuclear factor-kappa B signaling pathway in gastric epithelial cells.

Microb Pathog 2016 Sep 27;98:63-8. Epub 2016 Jun 27.

Key Laboratory of Biological Resource and Ecological Environment of Chinese Education Ministry, College of Life Science, Sichuan University, Chengdu, 610064, PR China. Electronic address:

Helicobacter pylori (H. pylori) is a spiral shaped gram-negative bacterium that induces immune responses in the gastric mucosa. Toll-like receptors (TLRs) play important roles in mediating inflammatory cytokines by recognition of conserved molecular patterns on bacteria. Changes in the expression of toll-like receptor (TLR) 2, TLR4 and the relative inflammatory cytokines were analyzed in normal gastric epithelial GES-1 cells following treatment with H. pylori or Escherichia coli lipopolysaccharide (E. coli LPS) in order to investigate the contribution of TLRs in recognizing and mediating the inflammatory response to H. pylori, and study the differences in TLRs' performance between H. pylori and E. coli. Specific inhibitors for the declines in TLR2 and TLR4 were also employed. The results showed that H. pylori infection increased TLR2 expression in GES-1 cells, but TLR4 remained unchanged regardless of H. pylori or TLR2 small interfering RNA treatment. Furthermore, the secretion of cyclooxygenase-2 (COX-2) induced by H. pylori was inhibited by declines in TLR2, but not in TLR4. In conclusion, TLR2 plays an even more important role than TLR4 not only in recognizing H. pylori, but also in the induction of inflammatory cytokines initiated by H. pylori. However, both TLR2 and TLR4 are necessary in mediating the inflammatory response to E. coli LPS.
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http://dx.doi.org/10.1016/j.micpath.2016.06.028DOI Listing
September 2016
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