Cited by 113Cardiac Ischemia and ReperfusionMitochondrial Function and PathologyCell death mechanisms and regulation

Multifunctional Mitochondrial Epac1 Controls Myocardial Cell Death

Open access
Fazal, Loubina, Laudette, Marion, Paula-Gomes, Sílvia, Pons, Sandrine, Conte, Caroline, Tortosa, Florence, Sicard, Pierre, Sainte-Marie, Yannis +8 more·2017·Circulation Research

Abstract

Rationale: Although the second messenger cyclic AMP (cAMP) is physiologically beneficial in the heart, it largely contributes to cardiac disease progression when dysregulated. Current evidence suggests that cAMP is produced within mitochondria. However, mitochondrial cAMP signaling and its involvement in cardiac pathophysiology are far from being understood. Objective: To investigate the role of MitEpac1 (mitochondrial exchange protein directly activated by cAMP 1) in ischemia/reperfusion injury. Methods and Results: We show that Epac1 (exchange protein directly activated by cAMP 1) genetic ablation ( Epac1 −/− ) protects against experimental myocardial ischemia/reperfusion injury with reduced infarct size and cardiomyocyte apoptosis. As observed in vivo, Epac1 inhibition prevents hypoxia/reoxygenation–induced adult cardiomyocyte apoptosis. Interestingly, a deleted form of Epac1 in its mitochondrial-targeting sequence protects against hypoxia/reoxygenation–induced cell death. Mechanistically, Epac1 favors Ca 2+ exchange between the endoplasmic reticulum and the mitochondrion, by increasing interaction with a macromolecular complex composed of the VDAC1 (voltage-dependent anion channel 1), the GRP75 (chaperone glucose-regulated protein 75), and the IP3R1 (inositol-1,4,5-triphosphate receptor 1), leading to mitochondrial Ca 2+ overload and opening of the mitochondrial permeability transition pore. In addition, our findings demonstrate that MitEpac1 inhibits isocitrate dehydrogenase 2 via the mitochondrial recruitment of CaMKII (Ca 2+ /calmodulin-dependent protein kinase II), which decreases nicotinamide adenine dinucleotide phosphate hydrogen synthesis, thereby, reducing the antioxidant capabilities of the cardiomyocyte. Conclusions: Our results reveal the existence, within mitochondria, of different cAMP–Epac1 microdomains that control myocardial cell death. In addition, our findings suggest Epac1 as a promising target for the treatment of ischemia-induced myocardial damage.

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 · 10.1161/circresaha.116.309859

Cites

42 of 42 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?

  • RAPGEF3 (EPAC1) appears to trigger PTPC opening by increasing mitochondrial Ca2+ levels through interaction with VDAC1, HSPA9, and ITPR1, and knockout of Rapgef3 protects mice against myocardial ischemia/reperfusion injury.

    “Finally, rap guanine nucleotide exchange factor 3 (RAPGEF3; best known as EPAC1) appears to trigger PTPC opening by increasing mitochondrial Ca2+ levels through interaction with VDAC1, heat shock protein family A (Hsp70) member 9 (HSPA9; best known as GRP75), and inositol 1,4,5-trisphosphate receptor type 1 (ITPR1; best known as IP3R1), and the knockout of Rapgef3 protects mice against myocardial”

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

Cited by

Sorted by citations

Authors
Fazal, L., Laudette, M., Paula-Gomes, S., Pons, S., Conte, C., Tortosa, F., Sicard, P., Sainte-Marie, Y., Bisserier, M., Lairez, O., Lucas, A., Roy, J., Ghaleh, B., Fauconnier, J., Mialet-Perez, J., & Lezoualc’h, F.
Affiliations
  • Inserm (FR)
  • From the Inserm, UMR-1048, Institut des Maladies Métaboliques et Cardiovasculaires, Toulouse, France (L.F., M.L., S.P.-G., C.C., F.T., P.S., Y.S.-M., M.B., O.L., A.L., J.M.-P., F.L.); Université de Toulouse, France (L.F., M.L., S.P.-G., C.C., F.T., P.S., Y.S.-M., M.B., O.L., A.L., J.M.-P., F.L.); Inserm, U955, Equipe 03, F-94000, Créteil, France (S.P., B.G.), and Inserm, UMR-1046 (J.R., J.F.); and UMR CNRS-9214, PHYMEDEX, Université de Montpellier, France (J.R., J.F.).
Corresponding author
  • Fazal, Loubina
  • Laudette, Marion
Venue
Circulation Research
Published
2017-02-17
Volume
120
Issue
4
Pages
645-657
ISSN
  • 0009-7330 (ISSN-L)
  • 1524-4571
OpenAlex
W2577171598
Cited by
111
References
42
Citations by year
2026: 3 · 2025: 7 · 2024: 13 · 2023: 11 · 2022: 9 · 2021: 16 · 2020: 12 · 2019: 15 · 2018: 20 · 2017: 5
FWCI
11.17
Type
journal article
Language
en
Open access
Locations
  • Circulation Research (publishedVersion)
  • PubMed (publishedVersion)
  • HAL (submittedVersion, other-oa)
Funders
  • Institut National de la Santé et de la Recherche Médicale
  • Fondation pour la Recherche Médicale
  • Fondation de France
  • Université de Toulouse
Topics
  • Health Sciences › Medicine › Pathology and Forensic Medicine › Cardiac Ischemia and Reperfusion
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Mitochondrial Function and Pathology
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Cell death mechanisms and regulation
Keywords
Epac1, myocardial ischemia-reperfusion injury, cardiomyocyte apoptosis, mitochondrial calcium overload, VDAC1, GRP75, IP3R1, mitochondrial permeability transition pore, IDH2, CaMKII, NADPH production, hypoxia/reoxygenation, mitochondrial targeting sequence
MeSH terms
Animals, Animals, Newborn, Cells, Cultured, Heart Failure, Humans, Male, Mitochondria, Heart, Cell Death, Mice, Knockout, Guanine Nucleotide Exchange Factors, Membrane Microdomains, Myocytes, Cardiac, Mice, Rats

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