Cited by 275Pancreatic function and diabetesDiabetes and associated disordersDiabetes Treatment and Management

Disproportionate elevation of immunoreactive proinsulin in Type 2 (non-insulin-dependent) diabetes mellitus and in experimental insulin resistance

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Ward, W. K., LaCava, E. C., Paquette, T. L., Beard, J. C., Wallum, B. J., Porte, D.·1987·Diabetologia

Abstract

In this study, we found that the ratio of proinsulin to total immunoreactive insulin was much higher in 22 patients with Type 2 (non-insulin-dependent) diabetes mellitus than in 28 non-diabetic control subjects of similar age and adiposity (32 +/- 3 vs 15 +/- 1%, p less than 0.001). In addition, the arginine-induced acute proinsulin response to total immunoreactive insulin response ratio was greater in diabetic patients (n = 10) than in control subjects (n = 9) (8 +/- 2 vs 2 +/- 0.5%, p = 0.009), suggesting that increased islet secretion per se accounted for the increased ratio of proinsulin to immunoreactive insulin. One explanation for these findings is that increased demand for insulin in the presence of islet dysfunction leads to a greater proportion of proinsulin secreted from the B cell. We tested this hypothesis by comparing proinsulin secretion before and during dexamethasone-induced insulin resistance in diabetic patients and control subjects. Dexamethasone treatment (6 mg/day for 3 days) raised the proinsulin to immunoreactive insulin ratio in control subjects from 13 +/- 2 to 21 +/- 2% (p less than 0.0001) and in diabetic patients from 29 +/- 5 to 52 +/- 7% (p less than 0.001). Dexamethasone also raised the ratio of the acute proinsulin response to the acute immunoreactive insulin response in control subjects from 2 +/- 0.5 to 5 +/- 2% (p = 0.01) and in diabetic patients from 8 +/- 2 to 14 +/- 4% (p = NS), suggesting that the dexamethasone-induced increment in the basal ratio of proinsulin to immunoreactive insulin was also due to increased secretion.(ABSTRACT TRUNCATED AT 250 WORDS)

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Authors
Ward, W. K., LaCava, E. C., Paquette, T. L., Beard, J. C., Wallum, B. J., & Porte, D.
Affiliations
University of Washington (US)
Venue
Diabetologia
Published
1987-09
Volume
30
Issue
9
Pages
698-702
ISSN
  • 0012-186X (ISSN-L)
  • 1432-0428
OpenAlex
W2043209055
Cited by
275
References
13
Citations by year
2025: 2 · 2023: 8 · 2021: 5 · 2020: 6 · 2019: 3 · 2018: 6 · 2017: 8 · 2016: 4 · 2015: 5 · 2014: 7 · 2013: 2 · 2012: 3
FWCI
5.84
Type
journal article
Language
en
Open access
Locations
  • Diabetologia (publishedVersion)
  • PubMed (publishedVersion)
Funders
  • National Institutes of Health (5p30am017047-11, RR-37, 5r01am012829-17)
  • National Center for Research Resources (RR 37)
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, insulin resistance, beta-cell secretion, dexamethasone, islet dysfunction, insulin requirement, obesity
MeSH terms
Arginine, Blood Glucose, Dexamethasone, Diabetes Mellitus, Diabetes Mellitus, Type 2, Female, Humans, Insulin, Insulin Resistance, Male, Middle Aged, Obesity, Proinsulin

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