Why the study?
The role of the central nervous system in the pathogenesis of stress cardiomyopathy remains unknown.
Does inhibiting microglial activation with minocycline improve ventricular electrical stability and reduce myocardial injury in a rat model of stress cardiomyopathy?
Does inhibiting microglial activation with minocycline improve ventricular electrical stability and reduce myocardial injury in a rat model of stress cardiomyopathy?
In a rat model of stress cardiomyopathy, inhibiting hypothalamic microglial activation with minocycline reduced central and peripheral sympathetic activity, thereby improving left ventricular function and reducing susceptibility to ventricular arrhythmias.
Answers are grounded in this paper and cite their sources.
Hypothesis-generating for microglial inhibition in stress cardiomyopathy; leaves open translation to human arrhythmia prevention.
Background: Stress cardiomyopathy (SCM) currently has a high incidence in older adults, and the theories regarding its causes include "catecholamine myocardial toxicity" and "sympathetic hyperactivation". However, the role of the central nervous system in the pathogenesis of SCM remains unknown. We investigated the role of microglia activation in the paraventricular hypothalamic nucleus (PVN) in the development of SCM. Methods: An SCM model was created using male Sprague-Dawley (SD) rats, immobilized for 6 h every day for a week. Electrocardiogram, cardiac electrophysiology, and echocardiography examinations were performed to verify the changes in cardiac structure and function in rats with SCM. RNA sequencing was used to explore the changes in the hypothalamus during SCM. In addition, brain and heart tissues were collected to detect microglial activation and sympathetic activity. Results: The main findings were as follows: (1) immobilization stress successfully induced SCM in SD rats; (2) microglia were significantly activated in the hypothalamus, as evidenced by cytosol thickening, increases in the number of microglial branches, and microglia enriched in the PVN; (3) in SCM, the microglia in the PVN exhibited increased central and peripheral cardiac sympathetic activity and increased the expression of neuroinflammatory factors; and (4) it is possible that inhibiting microglial activation could suppress the sympathetic activity of the central nervous system and heart and increase cardiac electrical stability in SCM rats. Conclusions: SCM was induced in SD rats by immobilization stress, acting through the activation of the hypothalamic microglia. The activated microglia were specifically enriched in the PVN, increasing the activity of the central and peripheral sympathetic nervous systems by regulating the expression of neuro-inflammatory factors, mediating dysfunction of the left ventricle, and increasing the susceptibility to ventricular arrhythmias.
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Lin et al. (2024) studied Stress cardiomyopathy (n=60). Minocycline vs. Immobilization stress (model group) was evaluated on Ventricular effective refractory period (VERP) (p=<0.001).
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