title: IgY pharmacokinetics in rabbits: implications for IgY use as antivenoms.
abstract: This paper presents the first study of chicken IgY pharmacokinetics (PK) in rabbits. We measured IgY blood serum concentrations using a specific high sensitivity ELISA method. The fast initial component observed when studying horse Fab, F(ab')2 or IgG was absent from IgY PK. During the first 80 min of observation there was only a single slow exponential decay, which sped up afterward to the point that IgY became undetectable after 216 h of observation; due to this time course, PK parameters were determined with trapezoidal integration. The most significant IgY pharmacokinetic parameters determined were (all presented as medians and their 95% confidence interval): Area Under the Curve = 183.8 (135.2, 221.5) mg·h·L(-1); Distribution volume of the central compartment·[Body Weight (BW)](-1) = 46.0 (21.7, 70.3) mL·kg(-1); Distribution volume in steady state·BW(-1) = 56.8 (44.4, 68.5) mLkg(-1); Mean Residence Time = 40.1 (33.6, 48.5) h; Total plasma clearance·BW(-1) = 1.44 (1.15, 1.66) mL·h(-1)·kg(-1). Anti IgY IgG titers determined by ELISA increased steadily after 72 h, and reached 2560 (1920, 5760) dilution(-1) at 264 h; anti-chicken IgG concentrations rose up to 3.19 (2.31, 6.17) μg/mL in 264 h. Our results show that IgY PK lacks the fast initial decay observed in other PK studies using horse IgG, F(ab')2 or Fab, remains in the body 39.0 (28.7, 47.2) % much as IgG and is ≈3 times more immunogenic that horse IgG in rabbits.
authors.affiliation: Laboratory on Cellular Neuropharmacology, Centro de Biofísica y Bioquímica, Instituto Venezolano de Investigaciones Científicas (IVIC), Caracas, Venezuela.
authors.forename: Patricia
authors.initials: P
authors.lastname: Díaz
authors.affiliation: Unidad de Neurociencias, Instituto de Estudios Avanzados (IDEA), Caracas, Venezuela.
authors.forename: Caridad
authors.initials: C
authors.lastname: Malavé
authors.affiliation: Unidad de Neurociencias, Instituto de Estudios Avanzados (IDEA), Caracas, Venezuela.
authors.forename: Noraida
authors.initials: N
authors.lastname: Zerpa
authors.affiliation: Instituto de Biotecnología (IBt), Universidad Nacional Autónoma de México, Cuernavaca, Mexico.
authors.forename: Hilda
authors.initials: H
authors.lastname: Vázquez
authors.affiliation: Laboratory on Cellular Neuropharmacology, Centro de Biofísica y Bioquímica, Instituto Venezolano de Investigaciones Científicas (IVIC), Caracas, Venezuela.
authors.forename: Gina
authors.initials: G
authors.lastname: D'Suze
authors.affiliation: Unidad de Neurociencias, Instituto de Estudios Avanzados (IDEA), Caracas, Venezuela.
authors.forename: Yuyibeth
authors.initials: Y
authors.lastname: Montero
authors.affiliation: Unidad de Neurociencias, Instituto de Estudios Avanzados (IDEA), Caracas, Venezuela.
authors.forename: Cecilia
authors.initials: C
authors.lastname: Castillo
authors.affiliation: Instituto de Biotecnología (IBt), Universidad Nacional Autónoma de México, Cuernavaca, Mexico.
authors.forename: Alejandro
authors.initials: A
authors.lastname: Alagón
authors.affiliation: Laboratory on Cellular Neuropharmacology, Centro de Biofísica y Bioquímica, Instituto Venezolano de Investigaciones Científicas (IVIC), Caracas, Venezuela. Electronic address: csevcik@ivic.gob.ve.
authors.forename: Carlos
authors.initials: C
authors.lastname: Sevcik
mesh_terms: D000818:Animals; D000997:Antivenins / Q000097:blood* / Q000627:therapeutic use; D004797:Enzyme-Linked Immunosorbent Assay; D006736:Horses; D007136:Immunoglobulins / Q000097:blood* / Q000627:therapeutic use; D011817:Rabbits
chemical_list: D000997:Antivenins; C016512:IgY; D007136:Immunoglobulins
keywords: Acquired immunity; Antivenoms; IgY; Pharmacokinetics