Cited by 97Growth Hormone and Insulin-like Growth FactorsPancreatic function and diabetesMetabolism, Diabetes, and Cancer

Impaired glucose homeostasis in insulin-like growth factor binding protein-1 transgenic mice

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Rajkumar, K, Krsek, M, Dheen, S T, Murphy, L J·1996·Journal of Clinical Investigation

Abstract

Transgenic mice that overexpressed IGFBP-1 are hyperinsulinemic in the first week of life and gradually develop fasting hyperglycemia. In adult transgenic mice, the hypoglycemic response to IGF-I but not insulin or des (1-3) IGF-I was attenuated (P < 0.05) compared with wild-type mice. Furthermore, in isolated adipocytes from transgenic mice, the stimulatory effect of IGF-I but not insulin on 2-deoxy-[3H]-glucose uptake was reduced (P < 0.02). In contrast, in isolated soleus muscle, the effects of both IGF-I and insulin on 2-deoxy-3H-glucose uptake and on [3H]-glucose incorporation into glycogen were significantly reduced compared to wild-type mice. The decline in specific activity of the 2-deoxy-3H-glucose, a measure of glucose appearance in the circulation, was more marked in transgenic animals (P < 0.05). In addition, tissue uptake of glucose was significantly higher in diaphragm, heart, intestine, liver, soleus muscle, and adipose tissue from fasting transgenic mice. Plasma concentrations of alanine, lysine, and methionine were also elevated in transgenic mice. These data suggest that overexpression of IGFBP-1 attenuates the hypoglycemic effect of endogenous IGF-I, which is initially compensated for by enhanced pancreatic insulin production. However, in adult mice pancreatic insulin content is reduced, insulin resistance is demonstrable in skeletal muscle and fasting hyperglycemia develops.

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  • IGFBP1 is elevated in patients with type 2 diabetes and counteracts the hypoglycemic effect of insulin through inhibition of IGF1.

    “IGFBP1 is elevated in patients with type 2 diabetes and has been shown to counteract the hypoglycemic effect of insulin through inhibition of IGF1 [224].”
  • IGFs are regulated by a family of IGF-binding proteins that can bind IGFs with equal or greater affinity than IGF1R.

    “IGFs are regulated by a family of IGF-binding proteins (IGFBP) that can bind IGFs with equal or greater affinity than IGF1R [224,225].”

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  1. Pell, J.M., H.C. Flick-Smith, S. Dye, and R.A. Hill. 1995. Further char- acterization of an IGF-I enhancing antibody: actions on IGF-I-induced hy- poglycemia and interaction with the analogue LR 3 IGF-I. Proc. 3rd Interna- tional Symposium on Insulin-like Growth Factor Binding Proteins. p38 (Abstr.)

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Authors
Rajkumar, K., Krsek, M., Dheen, S. T., & Murphy, L. J.
Affiliations
University of Manitoba (CA)
Venue
Journal of Clinical Investigation
Published
1996-10-15
Volume
98
Issue
8
Pages
1818-1825
ISSN
0021-9738 (ISSN-L)
OpenAlex
W2115140038
Cited by
97
References
33
Citations by year
2026: 1 · 2024: 1 · 2022: 1 · 2021: 2 · 2020: 3 · 2019: 1 · 2017: 3 · 2016: 3 · 2015: 4 · 2014: 2 · 2013: 2 · 2012: 5
FWCI
2.94
Type
journal article
Language
en
Open access
Locations
  • Journal of Clinical Investigation (publishedVersion)
  • Europe PMC (PubMed Central) (publishedVersion)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
  • National University of Singapore (submittedVersion)
Funders
  • Canadian Diabetes Association
  • Medical Research Council Canada
  • Medical Research Council
Topics
  • Health Sciences › Medicine › Endocrinology, Diabetes and Metabolism › Growth Hormone and Insulin-like Growth Factors
  • Health Sciences › Medicine › Surgery › Pancreatic function and diabetes
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Metabolism, Diabetes, and Cancer
Keywords
IGFBP-1, transgenic mice, glucose homeostasis, fasting hyperglycemia, hypoglycemic response, insulin-like growth factor I, insulin resistance, skeletal muscle glucose uptake, adipocytes, glucose appearance, plasma amino acids, hyperinsulinemia
MeSH terms
Insulin Secretion, Animals, Blood Glucose, Deoxyglucose, Glucose, Homeostasis, Insulin, Insulin-Like Growth Factor I, Islets of Langerhans, Male, Mice, Transgenic, Insulin-Like Growth Factor Binding Protein 1, Mice

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