title: Simple method for assaying serum oxytocin and changes of serum oxytocin level during parturition in cynomolgus monkeys.
abstract: A novel and simple assay system using a 96-well ELISA plate was established for measuring serum oxytocin in cynomolgus monkeys. This method omits the centrifuge for B/F separation because the second anti-rabbit IgG antibody-coated ELISA plate can easily separate the first anti-oxytocin rabbit antibody-bound radiolabeled oxytocin. Since this method has the advantage of omitting B/F separation, it becomes possible to measure a large number of samples with simple steps. In addition, accurate and reproducible results could be obtained by this method. The optimal reaction condition made it possible to measure more than 8 pg/ml of serum oxytocin. The changes of serum oxytocin level in relation to the first delivery was determined in a total of 11 female monkeys who were divided into two groups, infant-accepting mothers (4 monkeys) and infant-rejecting ones (7 monkeys). The serum oxytocin levels of pre-delivery (one to 4 days before delivery) and post-delivery (within 12 hr after delivery) in infant-accepting mothers were 33.6 +/- 4.57 and 43.5 +/- 16.4 pg/ml, respectively. Those in infant-rejecting mothers were 39.0 +/- 9.6 and 31.4 +/- 7.0 pg/ml. Two-way ANOVA (accepting/rejecting x pre/post) revealed a significant interaction of two factors (F (1, 9) = 5.39, p < 0.05). This result implies the possibility of a different pattern of oxytocin secretion between infant-accepting and infant-rejecting mothers during parturition.
authors.affiliation: Tsukuba Primate Center for Medical Science, National Institute of Infectious Diseases, Hachimandai-1, Tsukuba, Ibaraki 305-0843, Japan.
authors.forename: Katsuyoshi
authors.initials: K
authors.lastname: Kawasaki
authors.forename: Yuko
authors.initials: Y
authors.lastname: Mitsui
authors.forename: Takahiro
authors.initials: T
authors.lastname: Ono
authors.forename: Hiromi
authors.initials: H
authors.lastname: Ogawa
authors.forename: Ichiro
authors.initials: I
authors.lastname: Takano
authors.forename: Tadashi
authors.initials: T
authors.lastname: Sankai
authors.forename: Keiji
authors.initials: K
authors.lastname: Terao
mesh_terms: D000818:Animals; D000831:Animals, Newborn; D000906:Antibodies; D001522:Behavior, Animal; D004797:Enzyme-Linked Immunosorbent Assay / Q000379:methods / Q000662:veterinary; D005260:Female; D007774:Lactation / Q000097:blood; D008252:Macaca fascicularis / Q000097:blood* / Q000523:psychology; D008425:Maternal Behavior; D010121:Oxytocin / Q000097:blood* / Q000276:immunology; D036801:Parturition / Q000097:blood*; D011247:Pregnancy; D011270:Pregnancy, Animal / Q000097:blood*; D011817:Rabbits
chemical_list: D000906:Antibodies; D010121:Oxytocin