Antidiuretic hormone-induced intramembranous alterations in mammalian collecting ducts.
Freeze-fracture electron microscopy had previously revealed antidiuretic hormone-induced aggregates of intramembranous particles in amphibian urinary bladder. To investigate the effects of antidiuretic hormone (ADH) in another ADH-sensitive epithelium, namely, mammalian renal collecting ducts, freeze-fracture studies were carried out in Brattleboro homozygous rats. Collecting duct luminal membranes of ADH-treated homozygotes showed intramembranous particle clusters (117 +/- 17/100 micron2) that were loosely packed and that occurred on both exoplasmic (E) and protoplasmic (P) faces. Untreated, control homozygous rats had significantly less (3 +/- 1/100 micron2) clusters. Changes similar to those seen in ADH-treated rats were observed in water-deprived Wistar rats. The clustered particles differed from those seen in ADH-treated amphibian urinary bladder in that the latter occurred only on the P face and were more densely packed. Nevertheless, our observations suggest a common membrane effect for ADH action that may apply in mammals and amphibia alike.
D000818:Animals; D003919:Diabetes Insipidus / Q000473:pathology; D005614:Freeze Fracturing; D007684:Kidney Tubules / Q000187:drug effects*; D007685:Kidney Tubules, Collecting / Q000187:drug effects* / Q000648:ultrastructure; D008297:Male; D051381:Rats; D014667:Vasopressins / Q000494:pharmacology*
D014667:Vasopressins