{"id":47348,"date":"2023-03-06T00:00:58","date_gmt":"2023-03-05T16:00:58","guid":{"rendered":"https:\/\/www.science.nus.edu.sg\/?p=47348"},"modified":"2023-03-06T09:00:01","modified_gmt":"2023-03-06T01:00:01","slug":"antimicrobial-nanonets-for-trap-and-kill-treatment-of-antibiotic-resistant-bacteria","status":"publish","type":"post","link":"https:\/\/www.science.nus.edu.sg\/blog\/2023\/03\/antimicrobial-nanonets-for-trap-and-kill-treatment-of-antibiotic-resistant-bacteria\/","title":{"rendered":"Antimicrobial nanonets for trap-and-kill treatment of antibiotic-resistant bacteria"},"content":{"rendered":"<p><span lang=\"EN-GB\" style=\"font-family: arial, helvetica, sans-serif; font-size: 16px;\">National University of Singapore (NUS) pharmaceutical scientists have developed synthetic peptide nanonets for treating infections by bacteria strains resistant to last-resort antibiotics.<\/span><\/p>\n<p><span style=\"font-family: arial, helvetica, sans-serif; font-size: 16px;\"><span lang=\"EN-US\">In nature, trap-and-kill is a common immune defense mechanism employed by various species, including humans. In response to the presence of pathogens, peptides are released from host cells and they promptly self-assemble in solution to form cross-linked nanonets, which then entrap the bacteria and render them more vulnerable to antimicrobial components. Several research groups have explored synthetic <\/span><span lang=\"EN-GB\">biomimetics of nanonets as an avenue for addressing the global healthcare challenge of widespread antibiotic resistance. However, most prominent studies in the field only yielded disjointed short nanofibrils restricted to the bacterial surfaces and are incapable of physically immobilizing the bacteria. Additionally, these designs were lacking in control over the initiation of the self-assembly process.<\/span><\/span><\/p>\n<p><span lang=\"EN-GB\" style=\"font-family: arial, helvetica, sans-serif; font-size: 16px;\">A research team led by Associate Professor Rachel EE from the Department of Pharmacy, NUS has designed short \u03b2-hairpin peptides of 15 to 16 residues that are capable of self-assembling into nanonets selectively in response to lipopolysaccharide or lipoteichoic acid, which are integral membrane components unique to bacteria. This specificity towards bacteria is an appealing attribute not yet achieved in the field. The peptide nanonets displayed both trapping and antimicrobial killing functionalities, thus offering a direct upgrade from the trap-only nanonets in nature as well as synthetic designs reported in the field. This opens up opportunities for modulating the activity spectrum of the material. The team further demonstrated functional tunability of the peptides, where potency and fibrillation capacity could be modulated by changing only one or two amino acids at the hairpin turn region of the sequences. Of interest, the nanonets displayed robustness against enzymatic degradation by trypsin, which is a major challenge limiting clinical applications of simple antimicrobial peptides. Biological evaluations of the peptide nanonets using murine models showed significant antimicrobial efficacy against colistin-resistant bacteria and no systemic toxicity. This work was performed in collaboration with Associate Professor Rajamani Lakshminarayanan who holds joint appointments with the Department of Pharmacy, NUS and the Singapore Eye Research Institute. These findings were published in Advanced Functional Materials.<i><\/i><\/span><\/p>\n<p><span lang=\"EN-GB\" style=\"font-family: arial, helvetica, sans-serif; font-size: 16px;\">Prof Ee said, \u201cOur peptide-based nanonets have shown potentials as an alternative anti-infective strategy to address antibiotic resistance. Our next challenge is to optimise the design for clinical application in humans.\u201d<\/span><\/p>\n<p><span lang=\"EN-GB\" style=\"font-family: arial, helvetica, sans-serif; font-size: 16px;\">In an ongoing effort to fully elucidate the functions of the peptide nanonets, the team is investigating their potential in simultaneously subduing inflammatory responses, a common co-occurrence at the site of bacterial infection.<\/span><\/p>\n<p><img fetchpriority=\"high\" decoding=\"async\" width=\"901\" height=\"751\" src=\"https:\/\/www.science.nus.edu.sg\/wp-content\/uploads\/2023\/02\/336._Rachel-EE_PHA_20230206_1.jpg\" alt=\"\" class=\"alignnone size-full wp-image-46900\" srcset=\"https:\/\/www.science.nus.edu.sg\/wp-content\/uploads\/2023\/02\/336._Rachel-EE_PHA_20230206_1.jpg 901w, https:\/\/www.science.nus.edu.sg\/wp-content\/uploads\/2023\/02\/336._Rachel-EE_PHA_20230206_1-300x250.jpg 300w, https:\/\/www.science.nus.edu.sg\/wp-content\/uploads\/2023\/02\/336._Rachel-EE_PHA_20230206_1-768x640.jpg 768w\" sizes=\"(max-width: 901px) 100vw, 901px\" \/><\/p>\n<p><span lang=\"EN-GB\" style=\"font-family: arial, helvetica, sans-serif; font-size: 16px;\">Schematic illustrates the stages in the bacteria-responsive formation of nanonets which trap and kill the microbes. Representative microscopy images show the nanonets entrapping two different disease-causing bacteria species. [Credit: <span style=\"font-family: arial, helvetica, sans-serif; font-size: 16px;\"><span lang=\"EN-US\">ADVANCED FUNCTIONAL MATERIALS]<\/span><\/span><\/span><\/p>\n<p><span lang=\"EN-GB\" style=\"font-family: arial, helvetica, sans-serif; font-size: 16px;\">\u00a0<\/span><\/p>\n<p><span style=\"font-family: arial, helvetica, sans-serif; font-size: 16px;\"><b><span lang=\"EN-AU\">Reference<\/span><\/b><span lang=\"EN-AU\">:<\/span><\/span><\/p>\n<p><span style=\"font-family: arial, helvetica, sans-serif; font-size: 16px;\"><span lang=\"EN-US\">Tram NDT; Xu J; Mukherjee D; Obanel AE; Mayandi V; Selvarajan V; Zhu X; Teo J; Barathi VA; Lakshminarayanan R*; Ee PLR*, \u201cBacteria<\/span><span lang=\"EN-US\">\u2010<\/span><span lang=\"EN-US\">Responsive Self<\/span><span lang=\"EN-US\">\u2010<\/span><span lang=\"EN-US\">Assembly of Antimicrobial Peptide Nanonets for Trap<\/span><span lang=\"EN-US\">\u2010<\/span><span lang=\"EN-US\">and<\/span><span lang=\"EN-US\">\u2010<\/span><span lang=\"EN-US\">Kill of Antibiotic<\/span><span lang=\"EN-US\">\u2010<\/span><span lang=\"EN-US\">Resistant Strains\u201d,\u00a0ADVANCED FUNCTIONAL MATERIALS DOI: 10.1002\/adfm.202210858 Published: 2023.<\/span><\/span><\/p>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>National University of Singapore (NUS) pharmaceutical scientists have developed synthetic peptide nanonets for treating infections by bacteria strains resistant to&#8230;<\/p>\n","protected":false},"author":16,"featured_media":47559,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[11173,13],"tags":[],"class_list":["post-47348","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-pharmaceutical-science","category-research-news"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v23.6 (Yoast SEO v23.6) - 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