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Absent factor VIII response to synthetic vasopressin analogue (DDAVP) in nephrogenic diabetes insipidus
Abstract:
To study the effect of 1-deamino-8D-arginine vasopressin (DDAVP) on the factor VIII response in nephrogenic diabetes insipidus (NDI), 0.30 microgram/kg DDAVP was given to 2 unrelated NDI patients, 3 obligate carriers, and 20 controls. Factor VIII coagulant activity (FVIIIC) and factor VIII related antigen (FVIIIR:Ag) responses were absent in both NDI patients and were decreased by approximately 50% in the carriers by comparison with controls. These results show that the vasopressin receptor defect in NDI is not confined to the kidney but is equally expressed in other tissues including the vascular endothelium and hepatic sinusoids, the respective sites of FVIIIR:Ag and FVIIIC production. A decreased factor VIII response may help in identifying carriers in families at risk.
Insights
1-deamino-8D-arginine vasopressin (DDAVP) affects factor VIII responses in nephrogenic diabetes insipidus (NDI). The vasopressin receptor defect in NDI patients and carriers impacts factor VIII production, aiding in carrier identification.
Area of Science:
- Endocrinology
- Hematology
- Genetics
Background:
- Nephrogenic diabetes insipidus (NDI) is a condition characterized by the kidney's inability to respond to vasopressin.
- The vasopressin receptor plays a crucial role in various physiological processes beyond renal water reabsorption.
Observation:
- This study investigated the effect of 1-deamino-8D-arginine vasopressin (DDAVP) on factor VIII responses in NDI patients and carriers.
- Factor VIII coagulant activity (FVIIIC) and factor VIII related antigen (FVIIIR:Ag) levels were measured after DDAVP administration.
Findings:
- NDI patients exhibited absent factor VIII responses to DDAVP, indicating a systemic vasopressin receptor defect.
- Obligate carriers showed a 50% reduction in factor VIII responses compared to controls, suggesting reduced receptor expression.
- The vasopressin receptor defect is present in vascular endothelium and hepatic sinusoids, sites of factor VIII production.
Implications:
- The findings demonstrate that the vasopressin receptor defect in NDI is not limited to the kidneys.
- Assessing factor VIII response to DDAVP may serve as a diagnostic tool for identifying carriers in families with a history of NDI.
- This research deepens the understanding of vasopressin receptor function and its implications in genetic disorders.