Antiviral Action of Methylated β-Lactoglobulin on the Human Influenza Virus A Subtype H3N2

• Published in: Probiotics and antimicrobial proteins Vol. 2; no. 2; pp. 104 - 111
• Main Authors: Sitohy, Mahmoud, Besse, Bernard, Billaudel, Sylviane, Haertlé, Thomas, Chobert, Jean-Marc
• Format: Journal Article
• Language: English
• Published: New York Springer-Verlag 01-06-2010
• Subjects: Applied Microbiology; Chemical and Process Engineering; Chemistry; Chemistry and Materials Science; Chemistry/Food Science; Engineering Sciences; Food engineering; Life Sciences; Microbiology; Nutrition; Protein Science; Beta-lactoglobulin; Esterification; H3N2; Antiviral activity; VIRUS A DE LA GRIPPE; ACTIVITE ANTIVIRALE; BETA-LACTOGLOBULIN ESTERIFICATION; ANTIVIRAL ACTIVITY; VIRUS H3N2; PROTEINE DU LACTOSERUM
• ISSN: 1867-1306; 1867-1314
• DOI: 10.1007/s12602-010-9036-5

Antiviral activity of methylated β-lactoglobulin (Met-BLG) against H3N2 infected into MDCK cell lines depended on concentration of Met-BLG, viral load, and duration of infection. IC
50%
of the hemagglutination activity for 1 and 0.2 MOI (multiplicity of infection) after 24 h of incubation at 37 °C in the presence of 5% CO
2
were 20 ± 0.8 and 17 ± 0.7 μg mL
−1
Met-BLG, respectively. Longer incubation period (4 days) was associated with low IC
50%
of the hemagglutination activity (7.1 ± 0.3 μg mL
−1
Met-BLG) and low IC
50%
of immuno-fluorescence of viral nucleoproteins (9.7 ± 0.4 μg mL
−1
Met-BLG) when using 0.2 and 0.1 MOI, respectively. A concentration of 25 μg mL
−1
of Met-BLG reduced the amount of replicating virus by about 2 and 1.3 logs when the viral load was 0.01 and 0.1 MOI, respectively, while higher concentrations reduced it by about 5–6 logs. Antiviral action of Met-BLG was coupled with a cellular protective action, which reached 100% when using 0.01 and 0.1 MOI and 83% when using 1.0 MOI. The time of Met-BLG addition after the viral infection was determinant for its antiviral efficacy and for its protection of the infected MDCK cell lines. Anti-hemagglutination action and cell protective action decreased gradually and in parallel with the delay in the time of Met-BLG addition to disappear totally after 10 h delay.