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Vasopressin secretion in the DIDMOAD (Wolfram) syndrome
C J Thompson1, J Charlton, S Walford
1Endocrine Unit, Royal Victoria Infirmary, Newcastle upon Tyne.
The Quarterly Journal of Medicine
|April 1, 1989
Summary
This study reveals hypothalamic diabetes insipidus is common in Wolfram (DIDMOAD) syndrome. Vasopressin secretion defects, not kidney issues, cause this condition in most patients.
Area of Science:
- Endocrinology
- Neuroscience
- Genetics
Background:
- The Wolfram syndrome (DIDMOAD) is a rare genetic disorder.
- Diabetes insipidus is a common feature, but its origin (hypothalamic vs. renal) is debated.
- Previous studies lacked formal vasopressin secretion analysis.
Purpose of the Study:
- To investigate vasopressin secretion in patients with Wolfram syndrome.
- To differentiate between hypothalamic and nephrogenic causes of diabetes insipidus in this syndrome.
- To understand the neuroanatomical basis of diabetes insipidus in Wolfram syndrome.
Main Methods:
- Studied seven patients with Wolfram syndrome.
- Utilized dynamic stimuli: hypertonic saline (osmotic), insulin tolerance test (hypoglycemia), and trimetaphan infusion (baroregulatory).
- Measured plasma vasopressin levels and response to desmopressin.
Main Results:
- Identified complete (3/7) and partial (4/7) hypothalamic diabetes insipidus via osmotic challenge.
- Desmopressin ruled out nephrogenic diabetes insipidus in all patients.
- Non-osmotic stimuli (hypoglycemia, hypotension) showed impaired vasopressin release, especially in complete hypothalamic DI.
Conclusions:
- Hypothalamic diabetes insipidus is more frequent in Wolfram syndrome than previously reported.
- Nephrogenic diabetes insipidus was not identified.
- Complete DI suggests a global loss of vasopressin-secreting neurons, not just osmoreceptor defects.
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