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2015 ; 22
(17
): 1502-14
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Metabolic alterations induce oxidative stress in diabetic and failing hearts:
different pathways, same outcome
#MMPMID25836025
Roul D
; Recchia FA
Antioxid Redox Signal
2015[Jun]; 22
(17
): 1502-14
PMID25836025
show ga
SIGNIFICANCE: Several authors have proposed a link between altered cardiac energy
substrate metabolism and reactive oxygen species (ROS) generation. A cogent
evidence of this association has been found in diabetic cardiomyopathy (dCM);
however, experimental findings in animal models of heart failure (HF) and in
human myocardium also seem to support the coexistence of the two alterations in
HF. CRITICAL ISSUES: Two important questions remain open: whether pathological
changes in metabolism play an important role in enhancing oxidative stress and
whether there is a common pathway linking altered substrate utilization and
activation of ROS-generating enzymes, independently of the underlying cardiac
pathology. In this regard, the comparison between dCM and HF is intriguing, in
that these pathological conditions display very different cardiac metabolic
phenotypes. RECENT ADVANCES: Our literature review on this topic indicates that a
vast body of knowledge is now available documenting the relationship between the
metabolism of energy substrates and ROS generation in dCM. In some cases,
biochemical mechanisms have been identified. On the other hand, only a few and
relatively recent studies have explored this phenomenon in HF and their
conclusions are not consistent. FUTURE DIRECTIONS: Better methods of
investigation, especially in vivo, will be necessary to test whether the
metabolic fate of certain substrates is causally linked to ROS production. If
successful, these studies will place a new emphasis on the potential clinical
relevance of metabolic modulators, which might indirectly mitigate cardiac
oxidative stress in dCM, HF, and, possibly, in other pathological conditions.