Dying fat cells may trigger self-amplifying cycle of inflammation in obesity

A new review examines adipocyte ferroptosis, the breakdown of fat cells due to oxidation from intracellular iron, as an emerging molecular mechanism potentially contributing to adipose tissue dysfunction, chronic inflammation and metabolic complications associated with obesity.

The study, titled “Adipocyte Ferroptosis in Obesity: Molecular Mechanisms and Nutraceutical Perspectives” and published in the International Journal of Molecular Sciences, brings together investigators affiliated with the Local Health Authority of Foggia (ASL Foggia), Temple University, the University Magna Graecia of Catanzaro, the University of Siena and the Sbarro Health Research Organization (SHRO) at Temple University, reflecting a multidisciplinary scientific collaboration across clinical, academic and biomedical research institutions.

The article synthesizes current evidence on the role of iron-dependent lipid peroxidation in adipocyte injury and death, with particular attention to the GPX4–glutathione antioxidant system and the Nrf2–Keap1 pathway. Obesity is characterized not only by excessive adipose tissue accumulation but also by profound alterations in adipose tissue homeostasis, including cellular stress, inflammation, metabolic dysfunction and adipocyte death.

Within this context, ferroptosis—a regulated form of cell death driven by iron-dependent lipid peroxidation—has emerged as a potential mechanism linking metabolic stress to adipose tissue inflammation. The review highlights evidence indicating that obese adipose tissue may present conditions favorable to ferroptosis, including altered iron homeostasis, accumulation of polyunsaturated fatty acid–rich phospholipids that are particularly susceptible to peroxidation, and impairment of antioxidant defenses.

The authors also discuss the possible interaction between ferroptotic adipocytes and macrophages, suggesting that signals released during adipocyte injury may contribute to inflammatory macrophage polarization and create a self-amplifying cycle of metabolic dysfunction.

“The study of adipocyte ferroptosis offers a valuable molecular framework for understanding how metabolic stress can be translated into persistent tissue inflammation,” says Antonio Giordano, M.D., Ph.D., founder and president of SHRO and professor at Temple University. “By connecting iron metabolism, lipid peroxidation, antioxidant defenses and immune-cell signaling, this emerging field may help identify new biological targets for the prevention and management of obesity-related metabolic disorders.”

“The next challenge is to determine which mechanisms are truly causal in human disease and how they can be translated into safe and effective interventions,” continues Giordano. “The review further explores the potential of plant-derived nutraceutical compounds, including curcumin, resveratrol, quercetin, bergamot polyphenolic fraction, sulforaphane, oleuropein and astaxanthin, which may influence multiple components of ferroptotic pathways through mechanisms such as modulation of oxidative stress, iron homeostasis, lipid peroxidation and activation of antioxidant signaling.”

The authors emphasize that direct experimental evidence demonstrating the ability of these nutraceuticals to specifically prevent ferroptosis in adipocytes within obese adipose tissue remains limited. Much of the available evidence derives from studies in other cell types or tissues, or from established biochemical properties of these compounds; therefore, their potential efficacy in obesity-associated adipocyte ferroptosis should currently be regarded as biologically plausible but not yet clinically established.

“Obesity is a complex biological and public health challenge in which metabolic, inflammatory and environmental determinants can converge on cellular pathways,” says Dr. Giovanna Liguori. “Studying adipocyte ferroptosis provides an opportunity to integrate molecular mechanisms with a broader One Health perspective, while maintaining a rigorous distinction between what is experimentally demonstrated and what remains a promising hypothesis.

“Our priority is now to support research capable of validating ferroptosis-related biomarkers and identifying mechanism-based interventions that can ultimately be evaluated in well-designed translational and clinical studies.”

According to the review, several important questions remain to be addressed, including whether ferroptosis occurs differently among white, beige and brown adipocytes, how ferroptotic signaling evolves during the progression of obesity, and how pathways such as NCOA4-mediated ferritinophagy and mitochondrial dysfunction contribute to adipocyte ferroptosis.

The authors also highlight the possibility that ferroptotic signaling may have context-dependent biological effects, with sublethal signaling potentially influencing adaptive or thermogenic responses, whereas excessive ferroptotic cell death may contribute to tissue damage and inflammation.

Future research will therefore require longitudinal experimental models, validated biomarkers and molecular readouts of ferroptosis, precise assessment of lipid peroxidation and iron metabolism, pharmacokinetic and pharmacodynamic characterization of candidate interventions, and ultimately appropriately designed translational and clinical studies.

The review concludes that adipocyte ferroptosis represents a promising area of investigation at the intersection of metabolism, redox biology, inflammation and cellular death, while emphasizing that the field remains at an early stage and that mechanistic validation is essential before ferroptosis-targeted or nutraceutical-based approaches can be considered established therapeutic strategies for obesity-related disease.

Provided by
Sbarro Health Research Organization