Key result
Cardiac macrophages capture dysfunctional cardiomyocyte mitochondria to maintain cardiac proteostasis and metabolic fitness.
Why the study?
The heart relies on macrophages to maintain mitochondrial and cardiomyocyte function through heterophagy, a process essential for metabolic fitness and proteostasis.
Cardiac macrophages play a critical role in maintaining the metabolic fitness of cardiomyocytes by clearing dysfunctional mitochondria.
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Macrophage integration may aid lifelong cardiomyocyte mitochondrial fitness; leaves open whether targeting these cells improves clinical outcomes.
The heart is a never-stopping engine that relies on a formidable pool of mitochondria to generate energy and propel pumping. Because dying cardiomyocytes cannot be replaced, this high metabolic rate creates the challenge of preserving organelle fitness and cell function for life. Here, we provide an immunologist's perspective on how the heart solves this challenge, which is in part by incorporating macrophages as an integral component of the myocardium. Cardiac macrophages surround cardiomyocytes and capture dysfunctional mitochondria that these cells eject to the milieu, effectively establishing a client cell-support cell interaction. We refer to this heterologous partnership as heterophagy. Notably, this process shares analogies with other biological systems, is essential for proteostasis and metabolic fitness of cardiomyocytes, and unveils a remarkable degree of dependence of the healthy heart on immune cells for everyday function.
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A 2022 study conducted a review in Cardiac metabolism and heterophagy. Cardiac macrophages capture dysfunctional mitochondria ejected by cardiomyocytes, a process termed heterophagy, which is essential for the proteostasis and metabolic fitness of the healthy heart.
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