Cited by 420Pancreatic function and diabetesDiabetes Treatment and ManagementDiabetes and associated disorders

Direct glucocorticoid inhibition of insulin secretion. An in vitro study of dexamethasone effects in mouse islets.

Open access
Lambillotte, C, Gilon, P, Henquin, J C·1997·Journal of Clinical Investigation

Abstract

The direct effects of glucocorticoids on pancreatic beta cell function were studied with normal mouse islets. Dexamethasone inhibited insulin secretion from cultured islets in a concentration-dependent manner: maximum of approximately 75% at 250 nM and IC50 at approximately 20 nM dexamethasone. This inhibition was of slow onset (0, 20, and 40% after 1, 2, and 3 h) and only slowly reversible. It was prevented by a blocker of nuclear glucocorticoid receptors, by pertussis toxin, by a phorbol ester, and by dibutyryl cAMP, but was unaffected by an increase in the fuel content of the culture medium. Dexamethasone treatment did not affect islet cAMP levels but slightly reduced inositol phosphate formation. After 18 h of culture with or without 1 microM dexamethasone, the islets were perifused and stimulated by a rise in the glucose concentration from 3 to 15 mM. Both phases of insulin secretion were similarly decreased in dexamethasone-treated islets as compared with control islets. This inhibition could not be ascribed to a lowering of insulin stores (higher in dexamethasone-treated islets), to an alteration of glucose metabolism (glucose oxidation and NAD(P)H changes were unaffected), or to a lesser rise of cytoplasmic Ca2+ in beta cells (only the frequency of the oscillations was modified). Dexamethasone also inhibited insulin secretion induced by arginine, tolbutamide, or high K+. In this case also the inhibition was observed despite a normal rise of cytoplasmic Ca2+. In conclusion, dexamethasone inhibits insulin secretion through a genomic action in beta cells that leads to a decrease in the efficacy of cytoplasmic Ca2+ on the exocytotic process.

The claims and statistics of this paper haven’t been checked yet.

Run the check — free, no account needed. It reads the open-access text and checks the sources it cites.

A few free checks a day · papers already verified open instantly · results are public

Integrity signals

Registry

Crossref · 10.1172/jci119175

Cites

63 of 63 references verified0 citation errors · 0 not checkable

Statistics

Claims the paper makes

The claims and statistics of this paper haven’t been checked yet.

Run the check — free, no account needed. It reads the open-access text and checks the sources it cites.

A few free checks a day · papers already verified open instantly · results are public

Claims other papers make about this one

Each is checked against this paper’s own text: does it say what the citing paper says it does?

Self-check

Percentages, sums and reported differences re-computed from the paper’s own numbers.

The self-check needs the paper’s full text.

Cites

Flagged first, then by citations

Research works printed but not linked: 1

  1. Morgan, N.G., R.D. Hurst, and S.L.F. Chan. 1989. Control of insulin secretion by ␣ 2 -receptor activation. Proc. 5th Japanese ␣-receptor Conference. 79-96.

Cited by

Sorted by citations

Authors
Lambillotte, C., Gilon, P., & Henquin, J. C.
Affiliations
UCLouvain (BE)
Venue
Journal of Clinical Investigation
Published
1997-02-01
Volume
99
Issue
3
Pages
414-423
ISSN
0021-9738 (ISSN-L)
OpenAlex
W2047680032
Cited by
419
References
59
Citations by year
2026: 3 · 2025: 13 · 2024: 9 · 2023: 14 · 2022: 9 · 2021: 18 · 2020: 13 · 2019: 17 · 2018: 9 · 2017: 10 · 2016: 17 · 2015: 27 · 2014: 26 · 2013: 23 · 2012: 30
FWCI
4.99
Type
journal article
Language
en
Open access
Locations
  • Journal of Clinical Investigation (publishedVersion)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
  • Digital Access to Libraries (Université catholique de Louvain (UCL), l'Université de Namur (UNamur) and the Université Saint-Louis (USL-B)) (submittedVersion, other-oa)
Funders
Fédération Wallonie-Bruxelles
Topics
  • Health Sciences › Medicine › Surgery › Pancreatic function and diabetes
  • Health Sciences › Medicine › Endocrinology, Diabetes and Metabolism › Diabetes Treatment and Management
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Genetics › Diabetes and associated disorders
Keywords
dexamethasone, glucocorticoids, insulin secretion, pancreatic beta cells, pancreatic islets, glucocorticoid receptor, pertussis toxin, phorbol ester, cyclic AMP, inositol phosphates, intracellular calcium, exocytosis, glucose-stimulated insulin secretion, L-arginine, tolbutamide, high potassium stimulation, glucose metabolism
MeSH terms
Insulin Secretion, Cyclic AMP, Animals, Arginine, B-Lymphocytes, Calcium, Cells, Cultured, Dexamethasone, Bucladesine, Dose-Response Relationship, Drug, Glucocorticoids, Glucose, Inositol Phosphates, Insulin, Islets of Langerhans, Male, Mice, Inbred Strains, NADP, Oxidation-Reduction, Virulence Factors, Bordetella, Phorbol Esters, Potassium, Receptors, Glucocorticoid, Tolbutamide, Pertussis Toxin, Mice

About these checks

Registry, retraction, Cites and statistics results are computed, not judged, with one exception: a printed reference that no index lists is read once by a model before it counts as a citation error. Claims are extracted by a model and kept only when their quote appears verbatim in the text; each cited source is then checked, with a model’s help, for whether it says what the claim relies on. Those verdicts can be wrong — read the claim’s quote and the cited source before relying on one.

Statistics and arithmetic are recomputed, not judged.

Confidence bands are shown only for fields calibrated on our annotated test set. None is calibrated yet, so no band is shown.

What counts as a claim ›How we measure confidence ›How we check this ›

Are you an author, or do you see a problem with this page? Request a review