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Youcui Xu,Yi Wu,Yi Hu,Mengran Xu,Yanyan Liu,Yuting Ding,Jing Chen,Xiaowan Huang,Longping Wen,Jiabin Li,Chen Zhu 한국생체재료학회 2023 생체재료학회지 Vol.27 No.00
Background The high mortality associated with drug-resistant bacterial infections is an intractable clinical problem resulting from the low susceptibility of these bacteria to antibiotics and the high incidence of recurrent infections. Methods Herein, a photosynthetic bacteria-based multiplex system (Rp@Al) composed of natural Rhodopseudomonas palustris (Rp) and Food and Drug Administration-approved aluminum (Al) adjuvant, was developed to combat drug-resistant bacterial infections and prevent their recurrence. We examined its photothermal performance and in vitro and in vivo antibacterial ability; revealed its protective immunomodulatory effect; verified its preventative effect on recurrent infections; and demonstrated the system’s safety. Results Rp@Al exhibits excellent photothermal properties with an effective elimination of methicillin-resistant Staphylococcus aureus (MRSA). In addition, Rp@Al enhances dendritic cell activation and further triggers a T helper 1 ( TH1)/TH2 immune response, resulting in pathogen-specific immunological memory against recurrent MRSA infection. Upon second infection, Rp@Al-treated mice show significantly lower bacterial burden, faster abscess recovery, and higher survival under near-lethal infection doses than control mice. Conclusions This innovative multiplex system, with superior photothermal and immunomodulatory effects, presents great potential for the treatment and prevention of drug-resistant bacterial infections.
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Tao Li,Xiaowan Xu,Ying Li,Hengming Wang,Zhiliang Li,Zhenxing Li 한국식물학회 2015 Journal of Plant Biology Vol.58 No.6
Heat stress is an important agricultural problem around the world. In pepper (Capsicum annum L.), heat stress seriously affects pollination and yield. However, to date, the molecular basis of heat stress has not been extensively studied. Using the HiSeq™ 2000 sequencing platform, the seedling transcriptome of heat-susceptible C.annuum ‘S590’(CaS) and heat-tolerant ‘R597’ (CaR) under the heat stress was examined. Over five million clean reads were generated from each library, each corresponding to a coverage of >250,000 nt. About 73% of the reads were mapped to the pepper genome, and 3,799 and 4,010 differentially expressed genes (DEGs) were identified in ‘R597’ (CaR) and ‘S590’(CaS), respectively. Gene ontology (GO) and Kyoto Encyclopedia of Genes and Genomes (KEGG) analyses determined that the identified DEGs were involved in heat shock protein, heat shock transcription factors, hormone, as well as calcium and kinase signaling. Further validation identified 35 genes that were involved in stress response, and that most of the heat shock proteins were upregulated in two genotypes, and highly expressed in susceptible S590 than in tolerant cultivar R597; the transcription factors and hormone signaling genes showed higher levels of expression in the heat-tolerant cultivar R597 than that observed in the heat-susceptible S590. These findings facilitate in better understanding of the molecular mechanism underlying heat stress in different pepper genotypes.
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Zhiming Wu,Jiaowen Cheng,Fang Hu,Cheng Qin,Xiaowan Xu,Kailin Hu 한국유전학회 2020 Genes & Genomics Vol.42 No.10
Plant-specifc SnRK2 (sucrose nonfermenting-1-related protein kinase 2) genes play crucial roles in the coordination of plant growth and development and responses to stress. However, comprehensive studies have not been performed for this gene family in pepper (Capsicum annuum), a very important Solanaceous vegetable worldwide. To fully understand the status of SnRK2s in chili pepper, a total of 9 putative SnRK2 genes (named CaSnRK2.1-2.9) were identifed in pepper in the present study. These genes were located on 7 diferent chromosomes and classifed into three subfamilies based on the phylogenetic tree. Their conserved motif compositions and exon-intron structures were systematically analyzed, and the results strongly supported the classifcation. Furthermore, a total of 81 putative cis-elements were found in the promoter regions, and the cis-elements related to hormone and stress signaling were abundant. Finally, the CaSnRK2 gene expression profles among diferent tissues, especially developing fruit tissue, and under various abiotic stresses were investigated to identify tissuespecifc or stress-responsive candidates. This study was the frst to comprehensively investigate the SnRK2 family in pepper, and the results provide important clues for further functional analyses of fruit development and abiotic stress responses.
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