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Iota-carrageenan extracted from red algae is a potent inhibitor of SARS-CoV-2 infection in reconstituted human airway epithelia

Bovard et al., Biochemistry and Biophysics Reports, doi:10.1016/j.bbrep.2021.101187
Dec 2021  
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In Vitro study showing iota-carrageenan inhibits SARS-CoV-2 in reconstituted human airway epithelia. Authors note that the absence of toxicity or any functional or structural impairment of the bronchial mucociliary epithelium indicates that topical treatment with nebulized iota-carrageenan is well tolerated at effective concentrations.
15 preclinical studies support the efficacy of iota-carrageenan for COVID-19:
Bovard et al., 15 Dec 2021, Switzerland, peer-reviewed, 7 authors. Contact: julia.hoeng@pmi.com.
In Vitro studies are an important part of preclinical research, however results may be very different in vivo.
This PaperIota-carragee..All
Iota-carrageenan extracted from red algae is a potent inhibitor of SARS‐CoV-2 infection in reconstituted human airway epithelia
David Bovard, Marco Van Der Toorn, Walter K Schlage, Samuel Constant, Kasper Renggli, Manuel C Peitsch, Julia Hoeng
Biochemistry and Biophysics Reports, doi:10.1016/j.bbrep.2021.101187
Iota-carrageenan (IC) nasal spray, a medical device approved for treating respiratory viral infections, has previously been shown to inhibit the ability of a variety of respiratory viruses, including severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2), to enter and replicate in the cell by interfering with the virus binding to the cell surface. The aim of this study was to further investigate the efficacy and safety of IC in SARS-CoV-2 infection in advanced in vitro models of the human respiratory epithelium, the primary target and entry port for SARS-CoV-2. We extended the in vitro safety assessment of nebulized IC in a 3-dimensional model of reconstituted human bronchial epithelium, and we demonstrated the efficacy of IC in protecting reconstituted nasal epithelium against viral infection and replication of a patient-derived SARS-CoV-2 strain. The results obtained from these two advanced models of human respiratory tract epithelia confirm previous findings from in vitro SARS-CoV-2 infection assays and demonstrate that topically applied IC can effectively prevent SARS-CoV-2 infection and replication. Moreover, the absence of toxicity and functional and structural impairment of the mucociliary epithelium demonstrates that the nebulized IC is well tolerated.
Declaration of competing interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.
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