Desmin Knock-Out Cardiomyopathy: A Heart on the Verge of Metabolic Crisis

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Elsnicova B., Hornikova D., Tibenska V., Kolar D., Tlapakova T., Schmid B., ...Daha Fazla

INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES, cilt.23, sa.19, 2022 (SCI-Expanded) identifier identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 23 Sayı: 19
  • Basım Tarihi: 2022
  • Doi Numarası: 10.3390/ijms231912020
  • Dergi Adı: INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Academic Search Premier, CAB Abstracts, EMBASE, Food Science & Technology Abstracts, MEDLINE, Veterinary Science Database, Directory of Open Access Journals
  • Anahtar Kelimeler: desmin, desminopathy, cardiomyopathy, mitochondriopathy, desmin knock-out metabolism, glucose, fatty acid, amino acid, creatine kinase, mitochondria, MITOCHONDRIAL CREATINE-KINASE, SKELETAL-MUSCLE, INTERMEDIATE-FILAMENTS, COMPUTATIONAL PLATFORM, ETFDH MUTATIONS, MUTANT DESMIN, FILAMIN C, GENE, CYTOSKELETON, DEFICIENCY
  • İstanbul Üniversitesi Adresli: Evet

Özet

Desmin mutations cause familial and sporadic cardiomyopathies. In addition to perturbing the contractile apparatus, both desmin deficiency and mutated desmin negatively impact mitochondria. Impaired myocardial metabolism secondary to mitochondrial defects could conceivably exacerbate cardiac contractile dysfunction. We performed metabolic myocardial phenotyping in left ventricular cardiac muscle tissue in desmin knock-out mice. Our analyses revealed decreased mitochondrial number, ultrastructural mitochondrial defects, and impaired mitochondria-related metabolic pathways including fatty acid transport, activation, and catabolism. Glucose transporter 1 and hexokinase-1 expression and hexokinase activity were increased. While mitochondrial creatine kinase expression was reduced, fetal creatine kinase expression was increased. Proteomic analysis revealed reduced expression of proteins involved in electron transport mainly of complexes I and II, oxidative phosphorylation, citrate cycle, beta-oxidation including auxiliary pathways, amino acid catabolism, and redox reactions and oxidative stress. Thus, desmin deficiency elicits a secondary cardiac mitochondriopathy with severely impaired oxidative phosphorylation and fatty and amino acid metabolism. Increased glucose utilization and fetal creatine kinase upregulation likely portray attempts to maintain myocardial energy supply. It may be prudent to avoid medications worsening mitochondrial function and other metabolic stressors. Therapeutic interventions for mitochondriopathies might also improve the metabolic condition in desmin deficient hearts.