THE DEVELOPMENT OF A RADIOIMMUNOASSAY FOR OXYTOCIN: THE EXTRACTION OF OXYTOCIN FROM PLASMA, AND ITS MEASUREMENT DURING PARTURITION IN HUMAN AND GOAT BLOOD
Abstract
SUMMARY: A method is described for the extraction and concentration of oxytocin from plasma which is simpler and more rapid than other available procedures. It has proved satisfactory for both radioimmunoassay and bioassay of circulating oxytocin. The recovery of added oxytocin was 60 ± 5·5% and showed no significant variation between plasma from pregnant and non-pregnant women, or plasma from other species. The sensitivity of the assay is related to the volume of plasma extracted. With a 10 ml plasma sample and the radioimmunoassay method described previously, the maximum sensitivity under optimal conditions is 0·75 μu. (1·5pg)/ml. In the second stage of human labour, oxytocin is not detectable in maternal plasma at this level of sensitivity. Of 36 cord venous plasma samples studied, 15 showed positive results in the range 1·5–20 μu. (3–40 pg)/ml; of 16 simultaneous cord arterial and venous plasmas, 12 showed positive results; the arterial samples showed a range of 8–145 μu. (7–290 pg)/ml with an average of 45 μu./ml; the venous samples showed a range of 0–100 μu. (0–200 pg)/ml with an average of 24 μu./ml. Plasma oxytocin levels during the second stage of labour in the goat averaged 120 μu. (240 pg)/ml by radioimmunoassay and 100 μu. (200 pg)/ml by bioassay. The half-life of infused oxytocin in the non-pregnant human subject as determined by radioimmunoassay was 5 min.
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The human posterior pituitary contains approximately 21 μg of oxytocin, whereas that of the rat contains 0.5-1 μg.
“the human posterior pituitary contains approximately 21 μg of oxytocin 72, 73, 74, whereas that of the rat contains 0.5–1 μg.”
From Measuring Oxytocin and Vasopressin: Bioassays, Immunoassays and Random Numbers (2016) · cites this paper as [72]
By the 1980s, many laboratories had generated radioimmunoassays for oxytocin using independently produced antibodies, and most but not all required extraction.
“By the 1980s, many laboratories had generated radioimmunoassays for oxytocin, using independently produced antibodies 58, 72, 73, 74, 94, 95, 96, 97, 98] and most, but not all 99, 100, required extraction.”
From Measuring Oxytocin and Vasopressin: Bioassays, Immunoassays and Random Numbers (2016) · cites this paper as [72]
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“Consistent with this, the human posterior pituitary contains approximately 21 l g of oxytocin (72– 74), whereas that of the rat contains 0.5–1 l g.”
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- Authors
- CHARD, T., BOYD, N. R. H., FORSLING, M. L., McNEILLY, A. S., & LANDON, J.
- ORCID
- McNEILLY, A. S.
- Venue
- Journal of Endocrinology
- Publisher
- Bioscientifica
- Published
- 1970-10-01
- Volume
- 48
- Issue
- 2
- Pages
- 223-234
- ISSN
- 0022-0795 (ISSN-L)
- 1479-6805
- OpenAlex
- W1970145961
- Cited by
- 140
- References
- 0
- Citations by year
- 2025: 4 · 2024: 1 · 2023: 1 · 2022: 1 · 2021: 2 · 2019: 4 · 2018: 2 · 2017: 3 · 2016: 4 · 2015: 3 · 2014: 2 · 2013: 4
- FWCI
- 18.93
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- Journal of Endocrinology (publishedVersion)
- PubMed (publishedVersion)
- Topics
- Social Sciences › Psychology › Social Psychology › Neuroendocrine regulation and behavior
- Health Sciences › Medicine › Obstetrics and Gynecology › Maternal and Perinatal Health Interventions
- Health Sciences › Medicine › Public Health, Environmental and Occupational Health › Pregnancy-related medical research
- Keywords
- oxytocin, radioimmunoassay, plasma extraction, childbirth, second stage of labor, umbilical cord blood, goats, human, bioassay, pregnancy
- MeSH terms
- Adsorption, Animals, Female, Goats, Humans, Iodine Isotopes, Labor, Obstetric, Male, Methods, Oxytocin, Pregnancy, Radioimmunoassay, Umbilical Cord
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