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Liposomal Systems as Nanocarriers for the Antiviral Agent Ivermectin

Croci et al., International Journal of Biomaterials, doi:10.1155/2016/8043983
May 2022  
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Ivermectin for COVID-19
4th treatment shown to reduce risk in August 2020
*, now known with p < 0.00000000001 from 100 studies, recognized in 22 countries.
No treatment is 100% effective. Protocols combine complementary and synergistic treatments. * >10% efficacy in meta analysis with ≥3 clinical studies.
3,800+ studies for 60+ treatments.
In Vitro study of liposomal formulations of ivermectin showing up to 5 times lower cytotoxicity and increased antiviral activity in Dengue strains.
Ivermectin, better known for antiparasitic activity, is a broad spectrum antiviral with activity against many viruses including H7N7 Götz, Dengue Tay, Wagstaff, HIV-1 Wagstaff, Simian virus 40 Wagstaff (B), Zika Barrows, Yang, West Nile Yang, Yellow Fever Mastrangelo, Varghese, Japanese encephalitis Mastrangelo, Chikungunya Varghese, Semliki Forest virus Varghese, Human papillomavirus Li, Epstein-Barr Li, BK Polyomavirus Bennett, and Sindbis virus Varghese.
Ivermectin inhibits importin-α/β-dependent nuclear import of viral proteins Götz, Kosyna, Wagstaff, Wagstaff (B), inhibits SARS-CoV-2 3CLpro Mody, shows spike-ACE2 disruption at 1nM with microfluidic diffusional sizing Fauquet, binds to glycan sites on the SARS-CoV-2 spike protein preventing interaction with blood and epithelial cells and inhibiting hemagglutination Boschi, Scheim, exhibits dose-dependent inhibition of lung injury Abd-Elmawla, Ma, may inhibit SARS-CoV-2 induced formation of fibrin clots resistant to degradation Vottero, may be beneficial for COVID-19 ARDS by blocking GSDMD and NET formation Liu (C), shows protection against inflammation, cytokine storm, and mortality in an LPS mouse model sharing key pathological features of severe COVID-19 DiNicolantonio, Zhang, may be beneficial in severe COVID-19 by binding IGF1 to inhibit the promotion of inflammation, fibrosis, and cell proliferation that leads to lung damage Zhao, may minimize SARS-CoV-2 induced cardiac damage Liu, Liu (B), increases Bifidobacterium which plays a key role in the immune system Hazan, has immunomodulatory Munson and anti-inflammatory DiNicolantonio (B), Yan properties, and has an extensive and very positive safety profile Descotes.
Croci et al., 8 May 2022, peer-reviewed, 7 authors. Contact:
In Vitro studies are an important part of preclinical research, however results may be very different in vivo.
This PaperIvermectinAll
Liposomal Systems as Nanocarriers for the Antiviral Agent Ivermectin
Romina Croci, Elisabetta Bottaro, Kitti Wing Ki Chan, Satoru Watanabe, Margherita Pezzullo, Eloise Mastrangelo, Claudio Nastruzzi
International Journal of Biomaterials, doi:10.1155/2016/8043983
RNA virus infections can lead to the onset of severe diseases such as fever with haemorrhage, multiorgan failure, and mortality. The emergence and reemergence of RNA viruses continue to pose a significant public health threat worldwide with particular attention to the increasing incidence of flaviviruses, among others Dengue, West Nile Virus, and Yellow Fever viruses. Development of new and potent antivirals is thus urgently needed. Ivermectin, an already known antihelminthic drug, has shown potent effects in vitro on Flavivirus helicase, with EC 50 values in the subnanomolar range for Yellow Fever and submicromolar EC 50 for Dengue Fever, Japanese encephalitis, and tick-borne encephalitis viruses. However ivermectin is hampered in its application by pharmacokinetic problems (little solubility and high cytotoxicity). To overcome such problems we engineered different compositions of liposomes as ivermectin carriers characterizing and testing them on several cell lines for cytotoxicity. The engineered liposomes were less cytotoxic than ivermectin alone and they showed a significant increase of the antiviral activity in all the Dengue stains tested (1, 2, and S221). In the current study ivermectin is confirmed to be an effective potential antiviral and liposomes, as drug carriers, are shown to modulate the drug activity. All together the results represent a promising starting point for future improvement of ivermectin as antiviral and its delivery.
Competing Interests The authors declare that there are no competing interests regarding the publication of this paper.
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