Key result
Elevated COMMD1 regulates cardiomyocyte copper efflux in chronic ischemia via an XIAP feedback loop.
Why the study?
Copper deficiency in myocardial infarction causes cardiomyocyte loss and cardiac dysfunction, but the mechanism driving copper efflux remains unclear.
Answers are grounded in this paper and cite their sources.
May inform copper homeostasis research in ischemia; leaves open transporter mechanisms and clinical translation.
Copper deficiency, commonly observed in myocardial infarction, leads to cardiomyocyte loss and cardiac dysfunction, yet the mechanism driving copper efflux remains unclear. To further elucidate the relationship between copper transporters and cardiac copper efflux during chronic myocardial ischemia, a rhesus monkey model was established by performing the permanent ligation of the left anterior descending coronary artery. A dramatic decrease in copper concentration within ischemic cardiomyocytes was observed alongside declining cardiac function. Among major copper transporters, COMMD1 and ATP7B were significantly upregulated in the ischemic myocardium. COMMD1 was specifically localised in cardiomyocytes undergoing copper efflux, whereas increased ATP7B was restricted to cardiac fibroblasts. This indicates that elevated COMMD1 regulates copper efflux in cardiomyocytes during chronic myocardial ischemia, functioning independently of its interactions with P-type ATPase transporters. Given the discrepancy between RNA and protein levels of COMMD1 in ischemic myocardium, post-translational modification is likely responsible for regulating COMMD1 expression. We found that the copper-binding protein with E3 ubiquitin ligase activity, XIAP, augmented before the rise in COMMD1 expression within ischemic cardiomyocytes. Excessive XIAP specifically interacted with COMMD1 to enhance its protein levels under copper-deprivation conditions and vice versa. Overall, our findings reveal a positive feedback loop among XIAP, COMMD1 and copper, highlighting the intricate interplay between XIAP and COMMD1 in regulating copper efflux in cardiomyocytes. This loop sets the stage for further investigation into therapeutic strategies to manage copper homeostasis in chronic myocardial ischemia.
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Li et al. (2025) studied Chronic myocardial ischemia. Permanent ligation of the left anterior descending coronary artery was evaluated on Copper concentration, cardiac function, and copper transporter expression. In a rhesus monkey model of chronic myocardial ischemia, elevated COMMD1 regulated cardiomyocyte copper efflux independently of P-type ATPases, driven by a positive feedback loop with XIAP.
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