4.7 Review

IL-6: A Potential Role in Cardiac Metabolic Homeostasis

Journal

Publisher

MDPI
DOI: 10.3390/ijms19092474

Keywords

interleukin-6 (IL-6); lipid metabolism; cardiac lipotoxicity; mitochondrial dysfunction

Funding

  1. National Natural Science Foundation of China [81500179, 81573484]
  2. Natural Science Foundation of Jiangsu Province [BK20150696]
  3. National Fund for Fostering Talents of Basic Science (NFFTBS) [J1310032]
  4. Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD)

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Interleukin-6 (IL-6) is implicated in multiple biological functions including immunity, neural development, and haematopoiesis. Recently, mounting evidence indicates that IL-6 plays a key role in metabolism, especially lipid metabolic homeostasis. A working heart requires a high and constant energy input which is largely generated by fatty acid (FA) beta-oxidation. Under pathological conditions, the precise balance between cardiac FA uptake and metabolism is perturbed so that excessive FA is accumulated, thereby predisposing to myocardial dysfunction (cardiac lipotoxicity). In this review, we summarize the current evidence that suggests the involvement of IL-6 in lipid metabolism. Cardiac metabolic features and consequences of myocardial lipotoxicity are also briefly analyzed. Finally, the roles of IL-6 in cardiac FA uptake (i.e., serum lipid profile and myocardial FA transporters) and FA metabolism (namely, beta-oxidation, mitochondrial function, biogenesis, and FA de novo synthesis) are discussed. Overall, understanding how IL-6 transmits signals to affect lipid metabolism in the heart might allow for development of better clinical therapies for obesity-associated cardiac lipotoxicity.

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