M. Miller et al., INCREASED VASOPRESSIN SECRETION AND RELEASE IN MICE TRANSGENIC FOR THE RAT ARGININE-VASOPRESSIN GENE, Neuroendocrinology, 57(4), 1993, pp. 621-625
The rat arginine vasopressin (AVP) genomic sequence has been utilized
to develop a line of transgenic mice homozygous and heterozygous for t
he transgene. Expression of the rat AVP gene was demonstrated by South
ern blotting and resulted in increased amounts of AVP in hypothalamus
and frontotemporal brain cortex. Secretion of AVP from the neurohypoph
ysial system results in an increased concentration of the hormone in t
he plasma and in an increased excretion in the urine in amounts three
to five times those of normal mice. Extraneural ectopic hormone produc
tion was found only in the pancreas. Despite chronic hypersecretion of
AVP, 24-hour urine volume and osmolality did not show evidence of inc
reased antidiuretic hormone action on the kidney, so that, under basal
conditions, the water balance in the animals is unaffected.