Abstract
Diphenyl ditelluride (PhTe)2, an organotelluric compound with pharmacological and toxicological attributes, has shown promise in microorganism studies. Drosophila melanogaster, an alternative animal model, is gaining popularity for novel antimicrobial research due to its cost-effectiveness, versatility, and similarity to vertebrate models. Given the rising antibiotic resistance, particularly in Escherichia coli (E. coli), the exploration of novel antimicrobials is of utmost importance. In (PhTe)2 safety validation, our findings indicate an 50% lethal concentration (LC50) of 41.74 µM for (PhTe)2 following a 48-h exposure period in Drosophila melanogaster. To assess potential motor and neurological deficits, we conducted behavioral analyses employing negative geotaxis and open field tests. Our outcomes reveal alterations in exploratory behavior at concentrations exceeding 50 µM (PhTe)2 in the flies. Consequently, we have established the optimal treatment concentration for Drosophila melanogaster as 10 µM (PhTe)2. Upon safety validation, we gauged the antimicrobial potential of (PhTe)2 through an oral infection model involving axenic flies. After exposing these flies to E. coli for 18–20 h, we treated them with 10 µM of (PhTe)2 for various time spans (0, 3, 6, 12, 24, and 48 h), followed by plating and colony counting. The logarithmic bacterial load curve demonstrated the antimicrobial impact of the compound, highlighting a significant reduction in bacterial load after 3 h of exposure to 10 µM (PhTe)2, with an enhancement of antimicrobial potential lasting up to 48 h. Given these results, we state that 10 µM (PhTe)2 was safe and presented antimicrobial potential, reducing the bacterial load in Drosophila melanogaster.
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The data that support the findings of this study are available from the corresponding author, upon request.
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Funding
The authors are grateful for the financial support received from the Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq) (308120/2020-5), the Fundação de Amparo à Pesquisa do Estado do Rio Grande do Sul (FAPERGS) (PQG 19/2551-0001913-0; 19/2551-0001975-0), and the Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)—Financial Code 001 for the support and research grants provided.
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FCB and MP designed the study. JSSN and GZ compound synthesis. FCB, VCB, SMA and MMMD conducted the safety validation and behavioral tests. FCB, VCB, SMA and MMMD analyzed the data and drafted the manuscript. AA and MP provided the main resources. SMA, MMMD and MP revised the manuscript. All authors contributed substantially to the study and approved the final version of the manuscript.
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Pinheiro, F.C., Bortolotto, V.C., Araujo, S.M. et al. Antimicrobial Effect of Diphenyl Ditelluride (PhTe)2 in a Model of Infection by Escherichia coli in Drosophila melanogaster. Indian J Microbiol (2024). https://doi.org/10.1007/s12088-024-01196-8
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DOI: https://doi.org/10.1007/s12088-024-01196-8