Cited by 312Mitochondrial Function and PathologyAutophagy in Disease and TherapyCardiovascular Function and Risk Factors

The DOI matches its Crossref record; 78 of the 78 references it cites were found in a registry or an index.

Hyperglycemia-Driven Inhibition of AMP-Activated Protein Kinase α2 Induces Diabetic Cardiomyopathy by Promoting Mitochondria-Associated Endoplasmic Reticulum Membranes In Vivo

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Abstract

Background: Fundc1 (FUN14 domain containing 1), an outer mitochondrial membrane protein, is important for mitophagy and mitochondria-associated endoplasmic reticulum membranes (MAMs). The roles of Fundc1 and MAMs in diabetic hearts remain unknown. The aims of this study, therefore, were to determine whether the diabetes mellitus–induced Fundc1 expression could increase MAM formation, and whether disruption of MAM formation improves diabetic cardiac function. Methods: Levels of FUNDC1 were examined in the hearts from diabetic patients and nondiabetic donors. Levels of Fundc1-induced MAMs and mitochondrial and heart function were examined in mouse neonatal cardiomyocytes exposed to high glucose (HG, 30 mmol/L d -glucose for 48 hours), and in streptozotocin-treated cardiac-specific Fundc1 knockout mice and cardiac-specific Fundc1 knockout diabetic Akita mice, as well. Results: FUNDC1 levels were significantly elevated in cardiac tissues from diabetic patients in comparison with those from nondiabetic donors. In cultured mouse neonatal cardiomyocytes, HG conditions increased levels of Fundc1, the inositol 1,4,5-trisphosphate type 2 receptor (Ip 3 r2), and MAMs. Genetic downregulation of either Fundc1 or Ip 3 r2 inhibited MAM formation, reduced endoplasmic reticulum-mitochondrial Ca 2+ flux, and improved mitochondrial function in HG-treated cardiomyocytes. Consistently, adenoviral overexpression of Fundc1 promoted MAM formation, mitochondrial Ca 2+ increase, and mitochondrial dysfunction in cardiomyocytes exposed to normal glucose (5.5 mmol/L d -glucose). In comparison with nondiabetic controls, levels of Fundc1, Ip 3 r2, and MAMs were significantly increased in hearts from streptozotocin-treated mice and Akita mice. Furthermore, in comparison with control hearts, diabetes mellitus markedly increased coimmunoprecipitation of Fundc1 and Ip 3 r2. The binding of Fundc1 to Ip 3 r2 inhibits Ip 3 r2 ubiquitination and proteasome-mediated degradation. Cardiomyocyte-specific Fundc1 deletion ablated diabetes mellitus–induced MAM formation, prevented mitochondrial Ca 2+ increase, mitochondrial fragmentation, and apoptosis with improved mitochondrial functional capacity and cardiac function. In mouse neonatal cardiomyocytes, HG suppressed AMP-activated protein kinase activity. Furthermore, in cardiomyocytes of Prkaa2 knockout mice, expression of Fundc1, MAM formation, and mitochondrial Ca 2+ levels were significantly increased. Finally, adenoviral overexpression of a constitutively active mutant AMP-activated protein kinase ablated HG-induced MAM formation and mitochondrial dysfunction. Conclusions: We conclude that diabetes mellitus suppresses AMP-activated protein kinase, initiating Fundc1-mediated MAM formation, mitochondrial dysfunction, and cardiomyopathy, suggesting that AMP-activated protein kinase–induced Fundc1 suppression is a valid target to treat diabetic cardiomyopathy.

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Metadata

Authors
Wu, S., Lu, Q., Ding, Y., Wu, Y., Qiu, Y., Wang, P., Mao, X., Huang, K., Xie, Z., & Zou, M.-H.
Affiliations
  • Georgia State University (US)
  • University of Washington (US)
  • Wuhan Union Hospital (CN)
Corresponding author
  • Xie, Zhonglin
  • Zou, Ming-Hui
Venue
Circulation
Published
2019-04-16
Volume
139
Issue
16
Pages
1913-1936
ISSN
  • 0009-7322 (ISSN-L)
  • 1524-4539
OpenAlex
W2911037090
Cited by
298
References
78
Citations by year
2026: 37 · 2025: 48 · 2024: 55 · 2023: 43 · 2022: 47 · 2021: 27 · 2020: 32 · 2019: 8
FWCI
9.43
Type
journal article
Language
en
Open access
Locations
  • Circulation (publishedVersion)
  • PubMed (publishedVersion)
  • Europe PMC (PubMed Central) (acceptedVersion)
  • PubMed Central (acceptedVersion)
Funders
  • American Heart Association (16POST31160009, 16GRANT29590003, 16POST29960011)
  • University of Washington
  • Georgia Research Alliance
  • National Institute on Aging (AG047776, R01AG047776)
  • National Heart, Lung, and Blood Institute (HL128014, HL137371, R01HL105157, HL 079584, R01HL079584, HL110488, HL140954, HL-080499, R01HL142287, R01HL137371, R01HL132500, R01HL074399, R01HL080499, HL132500, HL-089920, R01HL140954, R01HL110488, HL142287, R01HL128014, R01HL089920, CA213022, R01HL096032)
  • National Cancer Institute (CA-213022, R01CA213022)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Mitochondrial Function and Pathology
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Cell Biology › Autophagy in Disease and Therapy
  • Health Sciences › Medicine › Cardiology and Cardiovascular Medicine › Cardiovascular Function and Risk Factors
Keywords
diabetic cardiomyopathy, hyperglycemia, FUNDC1, mitochondria-associated endoplasmic reticulum membranes, IP3R2, mitochondrial calcium flux, mitophagy, AMPK, mitochondrial dysfunction, cardiomyocytes, streptozotocin-induced diabetes, Akita mice, cardiomyocyte-specific knockout, apoptosis, mitochondrial fragmentation, ubiquitination
MeSH terms
Adult, Aged, Animals, Cell Line, Endoplasmic Reticulum, Female, Gene Expression Regulation, Humans, Male, Membrane Proteins, Mice, Inbred C57BL, Middle Aged, Mitochondria, Myocardial Contraction, Mice, Knockout, Calcium Signaling, Mitochondrial Proteins, Myocytes, Cardiac, Mitochondrial Membranes, Mice, Rats, AMP-Activated Protein Kinases, Diabetic Cardiomyopathies

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