Radioimmunoassay of arginine vasopressin in Rhesus Monkey plasma. [/sup 125/I tracer technique]

Journal Article · Thu Apr 01 00:00:00 EST 1976 · Endocrinology; (United States)

OSTI ID:7193089

Hayward, J N; Pavasuthipaisit, K; Perez-Lopez, F R; Sofroniew, M V

Using a new antiserum and an enzymatic radioiodination of arginine vasopressin (AVP), we have developed a sensitive and specific radioimmunoassay for plasma AVP in the monkey. The sensitivity of the assay is 0.5 ..mu..U/ml, the cross reaction with oxytocin (OT), minimal. We used this assay to study the effects that variations in blood osmolality have in regulating AVP secretion in unanesthetized, chair-restrained, chamber-isolated, adult female rhesus monkeys. Under water ad lib conditions, plasma AVP and osmolality were relatively constant, averaging 1.7 +- 0.6 (SD) ..mu..U/ml and 298 +- 3 mosmol/kg, respectively. Water loading decreased plasma AVP and osmolality to 0.6 +- 0.2 ..mu..U/ml and 282 +- 6 mosmol/kg, respectively. When fluid restriction increased osmolality, plasma AVP rose progressively to twice the baseline after 1 day, and to 6 times the baseline after 3 days. The rise in plasma AVP was linearly correlated with the rise in osmolality (r = 0.93; P less than 0.001). Intravenous infusions of hypertonic saline produced significant rises in plasma osmolality and plasma AVP. There was a dose-related rise in plasma AVP that declined later at the expected rate with the infusion of physiological amounts of synthetic AVP.

• Research Organization: Univ. of Caifornia, Los Angeles
• OSTI ID: 7193089
• Journal Information: Endocrinology; (United States), Vol. 98:4
• Country of Publication: United States
• Language: English

Related Subjects

62 RADIOLOGY AND NUCLEAR MEDICINE
VASOPRESSIN
RADIOIMMUNOASSAY
ARGININE
BLOOD PLASMA
IODINE 125
MONKEYS
TRACER TECHNIQUES
AMINO ACIDS
ANIMALS
BETA DECAY RADIOISOTOPES
BIOLOGICAL MATERIALS
BLOOD
BODY FLUIDS
CARBOXYLIC ACIDS
DAYS LIVING RADIOISOTOPES
ELECTRON CAPTURE RADIOISOTOPES
HORMONES
INTERMEDIATE MASS NUCLEI
IODINE ISOTOPES
ISOTOPE APPLICATIONS
ISOTOPES
MAMMALS
NUCLEI
ODD-EVEN NUCLEI
ORGANIC ACIDS
ORGANIC COMPOUNDS
PEPTIDE HORMONES
PITUITARY HORMONES
PRIMATES
RADIOASSAY
RADIOISOTOPES
VERTEBRATES
550601* - Medicine- Unsealed Radionuclides in Diagnostics