Outcomes of hypothalamic oxytocin neuron-driven cardioprotection after acute myocardial infarction

Author:

Schunke Kathryn J.,Rodriguez Jeannette,Dyavanapalli Jhansi,Schloen John,Wang Xin,Escobar Joan,Kowalik Grant,Cheung Emily C.,Ribeiro Caitlin,Russo Rebekah,Alber Bridget R.,Dergacheva Olga,Chen Sheena W.,Murillo-Berlioz Alejandro E.,Lee Kyongjune B.,Trachiotis Gregory,Entcheva Emilia,Brantner Christine A.,Mendelowitz David,Kay Matthew W.ORCID

Abstract

AbstractAltered autonomic balance is a hallmark of numerous cardiovascular diseases, including myocardial infarction (MI). Although device-based vagal stimulation is cardioprotective during chronic disease, a non-invasive approach to selectively stimulate the cardiac parasympathetic system immediately after an infarction does not exist and is desperately needed. Cardiac vagal neurons (CVNs) in the brainstem receive powerful excitation from a population of neurons in the paraventricular nucleus (PVN) of the hypothalamus that co-release oxytocin (OXT) and glutamate to excite CVNs. We tested if chemogenetic activation of PVN-OXT neurons following MI would be cardioprotective. The PVN of neonatal rats was transfected with vectors to selectively express DREADDs within OXT neurons. At 6 weeks of age, an MI was induced and DREADDs were activated with clozapine-N-oxide. Seven days following MI, patch-clamp electrophysiology confirmed the augmented excitatory neurotransmission from PVN-OXT neurons to downstream nuclei critical for parasympathetic activity with treatment (43.7 ± 10 vs 86.9 ± 9 pA; MI vs. treatment), resulting in stark improvements in survival (85% vs. 95%; MI vs. treatment), inflammation, fibrosis assessed by trichrome blue staining, mitochondrial function assessed by Seahorse assays, and reduced incidence of arrhythmias (50% vs. 10% cumulative incidence of ventricular fibrillation; MI vs. treatment). Myocardial transcriptomic analysis provided molecular insight into potential cardioprotective mechanisms, which revealed the preservation of beneficial signaling pathways, including muscarinic receptor activation, in treated animals. These comprehensive results demonstrate that the PVN-OXT network could be a promising therapeutic target to quickly activate beneficial parasympathetic-mediated cellular pathways within the heart during the early stages of infarction.

Funder

American Heart Association

NIH

Publisher

Springer Science and Business Media LLC

Subject

Physiology (medical),Cardiology and Cardiovascular Medicine,Physiology

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