Cited by 175Pancreatic function and diabetesDiabetes and associated disordersDiabetes Treatment and Management

Serum proinsulin levels at fasting and after oral glucose load in patients with Type 2 (non-insulin-dependent) diabetes mellitus

Yoshioka, N., Kuzuya, T., Matsuda, A., Taniguchi, M., Iwamoto, Y.·1988·Diabetologia

Abstract

A simple and sensitive human proinsulin radioimmunoassay system was developed using guinea pig anti-proinsulin serum, which cross-reacted neither with human insulin nor C-peptide. The recognition site of the antiserum seems to be located near the junction between the B chain and C-peptide. With this assay system, we studied the serum proinsulin concentration at fasting and after an oral 100 g glucose load in 25 healthy subjects, 21 subjects with impaired glucose tolerance and 40 patients with Type 2 (non-insulin-dependent) diabetes mellitus. At fasting, serum proinsulin was 5.8 +/- 3.3 pmol/l in normal subjects as compared to 9.5 +/- 6.9 pmol/l (p less than 0.05) in subjects with impaired glucose tolerance and 12.6 +/- 7.5 pmol/l (p less than 0.001) in diabetic patients. The molar ratio of proinsulin to insulin was also increased in subjects with impaired glucose tolerance or diabetes compared to control subjects. After a 100 g oral glucose load, serum proinsulin increased more slowly than insulin. The proinsulin response after an oral glucose load was augmented in subjects with impaired glucose tolerance and diabetes, while the insulin response decreased with the elevation of fasting plasma glucose. Diabetic patients with high fasting plasma glucose had a very poor insulin response, but the proinsulin response was similar to control subjects. There was a linear correlation between summed proinsulin values and summed insulin values, but the slope of the regression line was steeper in diabetic patients than in control subjects. There was a relative increase in serum proinsulin both in subjects with impaired glucose tolerance and diabetic patients.(ABSTRACT TRUNCATED AT 250 WORDS)

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Crossref · 10.1007/bf02341503

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Authors
Yoshioka, N., Kuzuya, T., Matsuda, A., Taniguchi, M., & Iwamoto, Y.
Affiliations
Jichi Medical University (JP)
Venue
Diabetologia
Published
1988-06
Volume
31
Issue
6
Pages
355-360
ISSN
  • 0012-186X (ISSN-L)
  • 1432-0428
OpenAlex
W2030702380
Cited by
175
References
20
Citations by year
2025: 1 · 2023: 2 · 2022: 1 · 2021: 1 · 2020: 3 · 2019: 2 · 2018: 2 · 2017: 2 · 2016: 4 · 2015: 2 · 2014: 1 · 2013: 3
FWCI
8.54
Type
journal article
Language
en
Open access
closed
Locations
  • Diabetologia (publishedVersion)
  • PubMed (publishedVersion)
Topics
  • Health Sciences › Medicine › Surgery › Pancreatic function and diabetes
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Genetics › Diabetes and associated disorders
  • Health Sciences › Medicine › Endocrinology, Diabetes and Metabolism › Diabetes Treatment and Management
Keywords
proinsulin, type 2 diabetes, impaired glucose tolerance, oral glucose tolerance test, insulin response, proinsulin/insulin ratio, fasting blood glucose, beta-cell function
MeSH terms
Adult, Aged, Diabetes Mellitus, Type 2, Dietary Carbohydrates, Fasting, Female, Glucose, Glucose Tolerance Test, Humans, Insulin, Male, Middle Aged, Proinsulin, Reference Values

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