Cited by 363Pancreatic function and diabetesDiabetes Management and ResearchDiabetes and associated disorders

Prehepatic Insulin Production in Man: Kinetic Analysis Using Peripheral Connecting Peptide Behavior*

EATON, R. PHILIP, ALLEN, R. C., SCHADE, D. S., ERICKSON, K. M., STANDEFER, J.·1980·The Journal of Clinical Endocrinology & Metabolism

Abstract

The prehepatic production of insulin in normal man was evaluated by kinetic analysis of connecting peptide (C-peptide) behavior in the plasma in men and women. Studies were performed during suppression of endogenous insulin secretion (induced by both fasting and exogenous insulin injection) as well as during stimulation of secretion (induced by oral glucose ingestion) and iv glucose injection. Least squares spline fitting of the C-peptide data by interactive computer analysis permitted evaluation of the precursor production of insulin using a two-compartment model for C-peptide removal. Basal prehepatic insulin production averaged 15-4 mU/70 kg.min in 20 subjects and was reduced to 0.9 +/- 2.2 mU/70 kg.min after 84 h of fasting. The injection of exogenous iv insulin resulted in suppression of endogenous production to 0 +/- 2.5 mU/70 kg.min. Maximum prehepatic insulin production induced by a 100-g oral glucose tolerance test was 91 +/- 1.2 mU/70 kg.min, with a cumulative hormone secretion of 11.4 +/- 2.0 U over the 5 h of observation. After the acute iv injection of 25 g glucose, production rose to 465 +/- 108 mU/70 kg.min at 2 min post injection and rapidly returned toward basal. Levels of insulin in the portal vein calculated from this analysis were markedly elevated relative to simultaneous peripheral venous levels. These results quantitate prehepatic insulin production and portal venous insulin concentration from an analysis of the behavior of C-peptide within the plasma in both the steady state and the nonsteady state in man.

Integrity signals

Registry

Crossref · 10.1210/jcem-51-3-520

Cites

39 of 39 references verified0 citation errors · 0 not checkable

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  • C-peptide and insulin are secreted in equimolar fashion and C-peptide is not extracted by the liver.

    “given that both are secreted in an equimolar fashion and C-peptide is not extracted by the liver.”
  • Peripheral insulin concentrations do not represent insulin secretion but rather the sum of pancreatic insulin secretion, hepatic insulin extraction, and distribution into the circulating compartment.

    “However, peripheral insulin concentrations do not represent insulin secretion but rather the sum of pancreatic insulin secretion, hepatic insulin extraction, and distribution into the circulating compartment.”

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Authors
EATON, R. P., ALLEN, R. C., SCHADE, D. S., ERICKSON, K. M., & STANDEFER, J.
Affiliations
University of New Mexico (US)
Venue
The Journal of Clinical Endocrinology & Metabolism
Published
1980-09
Volume
51
Issue
3
Pages
520-528
ISSN
  • 0021-972X (ISSN-L)
  • 1945-7197
OpenAlex
W2070862761
Cited by
363
References
39
Citations by year
2026: 2 · 2025: 4 · 2024: 5 · 2023: 4 · 2022: 5 · 2021: 13 · 2020: 7 · 2019: 6 · 2018: 7 · 2017: 7 · 2016: 12 · 2015: 12 · 2014: 12 · 2013: 15 · 2012: 7
FWCI
4.98
Type
journal article
Language
en
Open access
closed
Locations
  • The Journal of Clinical Endocrinology & Metabolism (publishedVersion)
  • PubMed (publishedVersion)
Topics
  • Health Sciences › Medicine › Surgery › Pancreatic function and diabetes
  • Health Sciences › Medicine › Endocrinology, Diabetes and Metabolism › Diabetes Management and Research
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Genetics › Diabetes and associated disorders
Keywords
C-peptide kinetics, insulin secretion, fasting, oral glucose tolerance test, intravenous glucose, two-compartment model, sex differences
MeSH terms
Adult, C-Peptide, Fasting, Female, Glucose Tolerance Test, Humans, Infusions, Parenteral, Insulin, Kinetics, Male, Pancreas, Peptides

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