title: Evaluation of anti-influenza efficiency of polyclonal IgG antibodies specific to the ectodomain of M2 protein of influenza A virus by passive immunization of mice.
abstract: We attempted to quantify the protective potential of polyclonal IgG antibodies specific to the ectodomain of M2 protein (eM2) of influenza A virus (IAV) against lethal influenza infection of mice. For this purpose, eM2 conjugated with keyhole limpet hemocyanin (KLH) or KLH alone were administered with Freund's adjuvant intraperitoneally (i.p.) to BALB/c mice. IgG antibodies specific to the KLH-eM2 conjugate (anti-KLH-eM2 IgGs) and KLH (anti-KLH IgGs), respectively, were purified from ascitic fluids. Analysis of the preparation of anti-KLH-eM2 IgGs by ELISA revealed that it contained about 25% of anti-eM2 IgGs and 75% of anti-KLH IgGs. Taking into account this finding mice were passively immunized by intravenous route with 320, 160, 80, and 40 µg of anti-eM2 IgGs per mouse, respectively, while 320 µg of anti-KLH IgGs were used in control. Following subsequent infection with 3 LD50 IAV the survival of mice was determined. An absolute protection (100% survival) was obtained with 320 µg of anti-eM2 IgGs, and a relatively strong significant protection (~80% survival, p = 0.024) with 160 µg. The amount 160 µg of IgGs represents approx. 100 µg IgGs per 1 ml of blood.
authors: Department of Orthomyxoviruses, Slovak Academy of Sciences, Bratislava, Slovak Republic.
authors: J
authors: J
authors: Király
authors: E
authors: E
authors: Varečková
authors: V
authors: V
authors: Mucha
authors: F
authors: F
authors: Kostolanský
mesh_terms: D000818:Animals; D004797:Enzyme-Linked Immunosorbent Assay; D005260:Female; D006433:Hemocyanins / Q000276:immunology; D007114:Immunization; D007116:Immunization, Passive / Q000379:methods*; D007074:Immunoglobulin G / Q000627:therapeutic use*; D009980:Influenza A virus / Q000187:drug effects* / Q000276:immunology; D007252:Influenza Vaccines / Q000276:immunology*; D051379:Mice; D008807:Mice, Inbred BALB C; D009976:Orthomyxoviridae Infections / Q000276:immunology / Q000517:prevention & control*; D014763:Viral Matrix Proteins / Q000276:immunology*; D000086082:Viroporin Proteins
chemical_list: D006433:Hemocyanins; D007074:Immunoglobulin G; D007252:Influenza Vaccines; D014763:Viral Matrix Proteins; C488937:M2 protein, Influenza A virus; D000086082:Viroporin Proteins; C032808:keyhole-limpet hemocyanin