Home›Cardiology› Gut-derived metabolites influence myocardial mitochondrial homeostasis and inflammatory signaling in heart failure
Gut-derived metabolites influence myocardial mitochondrial homeostasis and inflammatory signaling in heart failureGut bacteria products may impact heart health in heart failure
Frontiers in MedicinePublished August 4, 2026DOI ↗Editorial oversight: Dr. Amelia Tan, PhD · Internal Medicine & Chronic Disease
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Key Takeaway
Note that gut-derived metabolites have divergent effects on myocardial mitochondria depending on the specific metabolite type.
This narrative review explores how various gut-derived metabolites influence myocardial mitochondrial homeostasis in heart failure. The scope includes the analysis of short-chain fatty acids, trimethylamine N-oxide, tryptophan-derived metabolites, bile acids, phenylacetylglutamine, indoxyl sulfate, and urolithins to determine their roles in oxidative metabolism and inflammatory regulation.
The authors synthesize findings indicating that short-chain fatty acids and indole-3-propionic acid are linked to mitochondrial oxidative metabolism, NAD+/SIRT3 signaling, and inflammatory regulation. Conversely, the choline/trimethylamine N-oxide axis, indoxyl sulfate, phenylacetylglutamine, and dysregulated bile acid metabolism are associated with myocardial fibrosis, oxidative stress, and mitochondrial dysfunction.
Several limitations are noted, including the influence of renal dysfunction and disease severity on clinical associations, as well as potential heart-to-gut reverse causality. Many mechanistic findings rely on animal models or ex vivo systems without cell-type-specific validation. The authors emphasize that metabolite effects are not uniform and depend on concentration, bioavailability, and specific heart failure phenotypes.
How this fits prior evidence
This narrative review extends the established knowledge that gut microbiota and their metabolic products communicate bidirectionally with the cardiovascular system. It specifically addresses the mechanism of this communication by detailing how specific metabolites influence myocardial mitochondrial homeostasis and inflammatory signaling in heart failure patients.
Living with heart failure is a constant battle against a weakening heart. Scientists are looking closely at the gut to see if it holds clues for better management. They found that certain substances, called metabolites, produced by gut bacteria play a significant role in how heart muscle cells function.
Some of these compounds, like short-chain fatty acids and indole-3-propionic acid, appear linked to healthy mitochondrial signaling and the regulation of inflammation. Other substances, such as indoxyl sulfate and certain bile acids, are associated with harmful outcomes like heart tissue scarring and oxidative stress. These findings suggest that the gut is a complex environment where some chemicals help while others may harm.
It is important to note that these results come from a variety of sources, including animal models and laboratory systems. Because many factors like kidney function and the specific type of heart failure can change how these compounds behave in the body, more research is needed to see how they work in human patients.
What this means for you:
Gut-derived chemicals have different effects on heart health, with some potentially helping and others causing harm.
Common questions
What are the gut-derived metabolites mentioned?
The study looks at several types of substances produced by gut bacteria. These include short-chain fatty acids, trimethylamine N-oxide, tryptophan-derived metabolites, bile acids, phenylacetylglutamine, indoxyl sulfate, and urolithins.
Are all of these gut products bad for the heart?
No, they are not all harmful. Some compounds like short-chain fatty acids are linked to helpful processes like inflammatory regulation. Others, such as indoxyl sulfate and certain bile acids, are associated with negative outcomes like tissue scarring and oxidative stress.
Is this a proven treatment for heart failure?
Not yet. Much of the evidence comes from animal models or laboratory systems rather than large human trials. Factors like kidney function and disease severity can also change how these substances affect a person's health.
Heart failure is a chronic cardiovascular syndrome with high morbidity and mortality worldwide, and its progression is closely linked to myocardial metabolic remodeling and disruption of mitochondrial homeostasis. Increasing evidence suggests that the gut microbiota and its metabolites represent an important interface between diet, inflammation, metabolic stress, and cardiovascular remodeling. Gut-derived metabolites, including short-chain fatty acids, trimethylamine N-oxide, tryptophan-derived metabolites, bile acids, phenylacetylglutamine, indoxyl sulfate, and urolithins, may influence myocardial mitochondrial homeostasis by affecting substrate oxidation, oxidative phosphorylation, reactive oxygen species production, inflammatory signaling, mitochondrial dynamics, mitophagy, and cell-death pathways. However, these metabolites should not be interpreted as uniformly protective or detrimental, because their biological effects may depend on concentration, exposure duration, bioavailability, protein binding, renal clearance, cellular targets, host metabotype, experimental model, and heart failure phenotype. Short-chain fatty acids and indole-3-propionic acid (IPA) have been linked to mitochondrial oxidative metabolism, nicotinamide adenine dinucleotide (NAD+)/sirtuin 3 (SIRT3)-related mitochondrial signaling, and inflammatory regulation in selected experimental settings, whereas the choline/trimethylamine N-oxide axis, indoxyl sulfate, phenylacetylglutamine, and dysregulated bile acid metabolism are associated with myocardial fibrosis, oxidative stress, mitochondrial dysfunction, and adverse outcomes. Nevertheless, many clinical associations may be influenced by renal dysfunction, disease severity, and heart-to-gut reverse causality, and many mechanistic findings remain derived from animal models, ex vivo systems, or non-classical heart-failure models. This narrative review summarizes current evidence linking gut-derived metabolites to myocardial mitochondrial homeostasis in heart failure, with emphasis on energy metabolic remodeling, oxidative stress, inflammation, mitochondrial quality control, cell death, and fibrotic remodeling. Potential intervention strategies targeting the gut microbiota and its metabolic pathways are also discussed with attention to their translational limitations and to the need for direct mitochondrial readouts, cell-type-specific validation, and phenotype-specific clinical studies.
