Abstract
Balamuthia mandrillaris and Naegleria fowleri are protist pathogens that can cause fatal infections. Despite mortality rate of > 90%, there is no effective therapy. Treatment remains problematic involving repurposed drugs, e.g., azoles, amphotericin B and miltefosine but requires early diagnosis. In addition to drug discovery, modifying existing drugs using nanotechnology offers promise in the development of therapeutic interventions against these parasitic infections. Herein, various drugs conjugated with nanoparticles were developed and evaluated for their antiprotozoal activities. Characterizations of the drugs’ formulations were accomplished utilizing Fourier-transform infrared spectroscopy, efficiency of drug entrapment, polydispersity index, zeta potential, size, and surface morphology. The nanoconjugates were tested against human cells to determine their toxicity in vitro. The majority of drug nanoconjugates exhibited amoebicidal effects against B. mandrillaris and N. fowleri. Amphotericin B-, Sulfamethoxazole-, Metronidazole-based nanoconjugates are of interest since they exhibited significant amoebicidal effects against both parasites (p < 0.05). Furthermore, Sulfamethoxazole and Naproxen significantly diminished host cell death caused by B. mandrillaris by up to 70% (p < 0.05), while Amphotericin B-, Sulfamethoxazole-, Metronidazole-based drug nanoconjugates showed the highest reduction in host cell death caused by N. fowleri by up to 80%. When tested alone, all of the drug nanoconjugates tested in this study showed limited toxic effects against human cells in vitro (less than 20%). Although these are promising findings, prospective work is warranted to comprehend the mechanistic details of nanoconjugates versus amoebae as well as their in vivo testing, to develop antimicrobials against the devastating infections caused by these parasites.
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This work was funded by University Internal Grant: CSRG 2021/03.
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RS and NAK conceived the study amid discussion with MRS and SSA. AB carried out experiments related to antimicrobials under the supervision of RS and NAK, while MK, JG, and TJ carried out all experiments related to synthesis, chemistry, and characterization. AB and MK conducted literature search under the supervision of RS, NAK, and MRS. AB and RS prepared the first draft. NAK and MRS corrected the manuscript. All authors approved the final manuscript.
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Communicated by Arivalagan Pugazhendhi.
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Siddiqui, R., Boghossian, A., Alqassim, S.S. et al. Anti-Balamuthia mandrillaris and anti-Naegleria fowleri effects of drugs conjugated with various nanostructures. Arch Microbiol 205, 170 (2023). https://doi.org/10.1007/s00203-023-03518-8
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DOI: https://doi.org/10.1007/s00203-023-03518-8