Zinc Oxide Nanoconjugates against Brain-Eating Amoebae

Area of Science:

• Nanotechnology
• Infectious Diseases
• Amoebiasis

Background:

• Naegleria fowleri and Balamuthia mandrillaris cause fatal CNS infections (PAM, GAE) with >90% mortality.
• Global warming may increase the incidence of these infections.
• Currently, no effective treatments are available for these amoebic infections.

Purpose of the Study:

• To investigate the amoebicidal activity and host cell cytotoxicity of zinc oxide (ZnO) conjugated with various compounds.
• To evaluate the potential of these novel nano-conjugates as therapeutic agents against N. fowleri and B. mandrillaris.

Main Methods:

• Zinc oxide nanoparticles were conjugated with Ampicillin, Ceftriaxone, Naringin, Amphotericin B, and Quercetin.
• Amoebicidal activity was assessed by measuring the viability of N. fowleri and B. mandrillaris exposed to the nano-conjugates.
• Host cell cytotoxicity was evaluated on human cells, and minimum inhibitory concentrations (MIC50) were determined.

Main Results:

• The ZnO nano-conjugates significantly reduced the viability of both N. fowleri and B. mandrillaris.
• Compounds like ZnO-CD-AMPi and ZnO-CD-AMB showed substantial reduction in amoeba viability.
• The nano-conjugates demonstrated limited cytotoxicity against human cells and effectively reduced amoeba-mediated host cell death.

Conclusions:

• Zinc oxide nano-conjugates exhibit potent amoebicidal activity against N. fowleri and B. mandrillaris.
• These compounds present a promising therapeutic avenue with a favorable safety profile.
• Further translational research is crucial to develop these nano-conjugates into effective treatments for devastating amoebic infections.