Abstract
Microbial threats and their resistance to the available drugs are public health concerns that scientists worldwide are trying to solve. Before the discovery of conventional drugs, natural products like fatty acids and salicylic acid derivatives had shown their effectiveness in fighting against pathogens and nowadays, they are considered as the next generation of antimicrobials. This study aiming to prepare new antibacterial and antifungal drugs, 24 new salicylate-fatty acids were designed and synthesized from fatty acids and salicylate derivatives and tested in vitro on several bacteria and fungi strains. It was found that salicylates covalently linked to palmitic acid had the best results with good (MIC = 31.25 μg/ml) and moderate (MIC = 62.5 and 125 μg/ml) antibacterial and antifungal activity against streptococcus pneumoniae, Staphylococcus aureus, Salomonella typhi, klebsiella pneumoniae, Escherichia coli, Trichophyton mentagrophytes, Microsporum audouinii, Epidermophyton floccosum and Microsporum gypseum. It was observed that saturated medium-chain (lauric, myristic) and unsaturated long-chain (oleic, linoleic, eleostearic) fatty acid units quenched the antimicrobial activity. Also, esterifying the phenolic OH and increasing the number of benzene ring reduced, on one hand the antibacterial activity of the compounds bearing the palmitic acid and, on the other, increased their antifungal activity. Acute toxicity experiments revealed that mono salicyl-palmitate is a relatively non-toxic substance since neither mortality nor changes in general behaviors of animals were recorded for 14 days after its oral administrations to mice with the median lethal dose (LD50) greater than 5000 mg/kg. Therefore, palmitic acid-salicylate esters are potential active ingredients for antimicrobial drugs.
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References
World Health Organization. Antimicrobial resistance. 2021. https://www.who.int/news-room/fact-sheets/detail/antimicrobial-resistance.
Butler MS, Cooper MA. Antibiotics in the clinical pipeline in 2011. J Antibiot. 2011;64:413–25. https://doi.org/10.1038/ja.2011.44.
Ziemska J, Rajnisz A, Solecka J. New perspectives on antibacterial drug research. Cent Eur J Biol. 2013;8:943–57. https://doi.org/10.2478/s11535-013-0209-6.
Guimarães A, Venâncio A. The potential of fatty acids and their derivatives as antifungal agents: a review. Toxins. 2022;14:188. https://doi.org/10.3390/toxins14030188.
Desbois AP, Smith VJ. Antibacterial free fatty acids: activities, mechanisms of action and biotechnological potential. Appl Microbiol Biotechnol. 2010;85:1629–42. https://doi.org/10.1007/s00253-009-2355-3.
Desbois AP. Potential applications of antimicrobial fatty acids in medicine, agriculture and other industries. Recent Pat Antiinfect Drug Discov. 2012;7:111–22. https://doi.org/10.2174/157489112801619728.
Kabara JJ, Vrable R, Lie Ken Jie MSF. Antimicrobial lipids: natural and synthetic fatty acids and monoglycerides. Lipids. 1977;12:753–9. https://doi.org/10.1007/BF02570908.
Bergsson G, Arnfinnsson J, Steingrímsson O, Thormar H. In vitro killing of Candida albicans by fatty acids and monoglycerides. Antimicrob Agents Chemother. 2001;45:3209–12. https://doi.org/10.1128/AAC.45.11.3209-3212.2001.
Franchea A, Fayeullea A, Lins L, Billamboz M, Pezrona I, Deleub M, et al. Amphiphilic azobenzenes: antibacterial activities and biophysical investigation of their interaction with bacterial membrane lipids. Bioorg Chem. 2020;94:103399. https://doi.org/10.1016/j.bioorg.2019.103399.
Findlay B, Zhanel GG, Schweizer F. Cationic amphiphiles, a new generation of antimicrobials inspired by the natural antimicrobial peptide scaffold. Antimicrob Agents Chemother. 2010;54:4049–58. https://doi.org/10.1128/AAC.00530-10.
Dhondikubeer R, Bera S, Zhanel G, Schweizer F. Antibacterial activity of amphiphilic tobramycin. J Antibiot. 2012;65:495–8. https://doi.org/10.1038/ja.2012.59.
Quenon C, Hennebelle T, Butaud J-F, Ho R, Samaillie J, Neut C, et al. Antimicrobial properties of compounds isolated from Syzygium malaccense (L.) Merr. and L.M. Perry and medicinal plants used in French Polynesia. Life. 2022;12:733. https://doi.org/10.3390/life12050733.
Li W, Estrada-de los Santos P, Matthijs S, Xie G-L, Busson R, Cornelis P, et al. Promysalin, a salicylate-containing pseudomonas putida antibiotic, promotes surface colonization and selectively targets other pseudomonas. Chem Biol. 2011;18:1320–30. https://doi.org/10.1016/j.chembiol.2011.08.006.
Steele AD, Knouse KW, Keohane CE, Wuest WM. Total synthesis and biological investigation of (−)-Promysalin. J Am Chem Soc. 2015;137:7314–7. https://doi.org/10.1021/jacs.5b04767.
Kaduskar RD, Scala GD, Al Jabri ZJH, Arioli S, Musso L, Oggioni MR, et al. Promysalin is a salicylate-containing antimicrobial with a cell-membrane-disrupting mechanism of action on Gram-positive bacteria. Sci Rep. 2017;7:8861. https://doi.org/10.1038/s41598-017-07567-0.
Dobler D, Schmidts T, Merzhäuser M, Schlupp P, Runkel F. Salicylate-based ionic liquids as innovative ingredients in dermal formulations. J Pharm Sci. 2022;111:1414–20. https://doi.org/10.1016/j.xphs.2021.09.028.
Laniado-Laborín R, Cabrales-Vargas MN. Amphotericin B: side effects and toxicity. Rev Iberoam Micol. 2009;26:223–7. https://doi.org/10.1016/j.riam.2009.06.003.
Yu Y, Chen P, Gao M, Lan W, Sun S, Ma Z, et al. Amphotericin B tamed by salicylic acid. ACS Omega. 2022;7:14690–6. https://doi.org/10.1021/acsomega.1c07201.
Balgavý P, Devínsky F. Cut-off effects in biological activities of surfactants. Adv Colloid Interface Sci. 1996;66:23–63. https://doi.org/10.1016/0001-8686(96)00295-3.
Ngaini Z, Mortadza NA. Synthesis of halogenated azo-aspirin analogues from natural product derivatives as the potential antibacterial agents. Nat Prod Res. 2019;33:3507–14. https://doi.org/10.1080/14786419.2018.1486310.
Bhattacharyya A, Sinha M, Singh H, Patel RS, Ghosh S, Sardana K, et al. Mechanistic insight into the antifungal effects of a fatty acid derivative against drug-resistant fungal infections. Front Microbiol. 2020;11:2116. https://doi.org/10.3389/fmicb.2020.0211.
Newton SM, Lau C, Gurcha SS, Besra GS, Wright CW. The evaluation of forty-three plant species for in vitro antimycobacterial activities; isolation of active constituents from Psoralea corylifolia and Sanguinaria Canadensis. J Ethnopharmacol. 2002;79:57–63. https://doi.org/10.1016/s0378-8741(01)00350-6.
Mativandlela SPN, Lall N, Meyer JJM. Antibacterial, antifungal and antitubercular activity of (the roots of) Pelargonium reniforme (CURT) and Pelargonium sidoides (DC) (Geraniaceae) root. S Afr J Bot. 2006;72:232–7. https://doi.org/10.1016/j.sajb.2005.08.002.
Venugopal PV, Venugopal TV. In vitro susceptibility of dermatophytes to imidazoles. Indian J Dermatol. 1992;37:35–41.
CLSI. M27-S3. Reference method for broth dilution antifungal susceptibility testing of yeasts, 3rd informational supplement. Wayne, PA: Clinical and Laboratory Standards Institute; 2008.
Publisher Organization for Economic Cooperation and Development (OECD). Guidelines for the Testing of Chemicals, OECD423. Acute oral toxicity-acute toxic class method, organization for economic cooperation and development, Paris; 2022. https://ntp.niehs.nih.gov/iccvam/suppdocs/feddocs/oecd/oecd_gl423.pdf.
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This work was carried out with the aid of a grant from UNESCO-TWAS and the Swedish International Development Cooperation Agency (Sida) (Grant number: 21-327 RG/CHE/AF/AC_G-FR32403). The views expressed herein do not necessarily represent those of UNESCO-TWAS, Sida or its Board of Governors.
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Ewonkem, M.B., Deussom, P.M., Mbock, M.A. et al. Antibacterial, antifungal activities and toxicity of new synthetic fatty acid salicylate esters. Med Chem Res 32, 736–748 (2023). https://doi.org/10.1007/s00044-023-03034-w
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DOI: https://doi.org/10.1007/s00044-023-03034-w