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Hyperproinsulinaemia in patients with myotonic dystrophy.

Abstract：

:Hyperinsulinaemia is a reported feature of the inherited multisystem disorder myotonic dystrophy. This phenomenon has been attributed to a compensatory beta cell response to tissue insulin resistance. In this study, circulating concentrations of insulin, proinsulin, and split proinsulin molecules were determined after an overnight fast in ten patients with myotonic dystrophy using two-site monoclonal antibody-based immunoradiometric assays. Results were compared with ten healthy control subjects matched for age, gender, and body mass index. Oral glucose tolerance (75 g), as defined by World Health Organization criteria, was normal in all subjects. Fasting plasma immunoreactive insulin concentration, as determined using a conventional radioimmunoassay, was almost three times higher (p < 0.005) in the myotonic dystrophy patients than the healthy control subjects. By contrast, fasting concentrations (mean +/- SEM) of C-peptide (0.75 +/- 0.09 vs 0.52 +/- 0.03 nmol/l, p = 0.07) and immunoradiometrically-determined insulin (60 +/- 12 vs 38 +/- 4 pmol/l, p = 0.09) were not significantly different between the groups. Fasting concentrations of proinsulin (10.3 +/- 2.9 vs 1.6 +/- 0.3 pmol/l, p < 0.01), and 32-33 split proinsulin (7.8 +/- 2.5 vs 2.9 +/- 0.4 pmol/l, p < 0.05) were significantly elevated in the patients with myotonic dystrophy. Accordingly, the mean fasting proinsulin:insulin ratio, expressed as a percentage, was significantly increased in the myotonic patients (20 +/- 5 vs 4 +/- 1%, p < 0.01). The overall C-peptide response to the oral glucose challenge was significantly greater in the myotonic patients compared with the healthy control subjects (p < 0.001). These results provide corroborative evidence of increased beta-cell secretion in myotonic dystrophy.(ABSTRACT TRUNCATED AT 250 WORDS)

journal_name

Diabetologia

journal_title

Diabetologia

authors

Krentz AJ,Clark PM,Cox L,Williams AC,Nattrass M

doi

10.1007/BF00401372

subject

Has Abstract

pub_date

1992-12-01 00:00:00

pages

1170-2

issue

12

eissn

0012-186X

issn

1432-0428

journal_volume

35

pub_type

杂志文章

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