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November 22, 2023Open Access

Rats with chronic heart failure exhibited depleted oxytocin content in axonal terminals, downregulated oxytocin receptors, and impaired oxytocin-driven GABAergic synaptic activity in the central amygdala.

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Why the study?

Heart failure patients often suffer from cognitive decline, depression, and mood impairments, but the underlying molecular signals and brain circuits remain elusive.

Population

Ischemic rat HF model and sham rats

Comparison

Ischemic HF rats vs sham rats

Design

Preclinical animal model study

Key result

Rats with chronic heart failure exhibited depleted oxytocin content in axonal terminals, downregulated oxytocin receptors, and impaired oxytocin-driven GABAergic synaptic activity in the central amygdala.

Authors

FAFerdinand AlthammerRRRanjan K. RoyMKMatthew K. Kirchner

Discussion

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Member takes

Overview

Impaired central amygdala oxytocin signaling in heart failure rats may link neurohormonal changes to disease; leaves open human relevance and therapeutic targeting.

PICO

P
Population
93 male Wistar rats (5-7 weeks old) subjected to coronary artery ligation to induce chronic heart failure or sham surgery, evaluated 4-5 weeks post-surgery.
E
Exposure / Comparator
Coronary artery ligation (Heart failure model) vs Sham surgery
O
Primary Outcome
Oxytocin signaling and GABAergic synaptic activity in the central amygdala

Limitations

  • Experiments were performed only at the established stage of HF (5-7 weeks after surgery), so the exact timing of alterations is unknown.
  • The study does not unequivocally demonstrate that the altered OTergic circuit is the underlying mechanism for cognitive and mood changes in HF rats.
  • Only male rats were included in the study.
  • Ex vivo slice preparations remove peripheral inputs and physiological variables.
  • Multiple processes in HF (neuroinflammation, hypoxia, elevated AngII) could contribute to the observed changes, making the exact trigger unclear.

Cite This Study

Althammer et al. (2023) studied Chronic heart failure (n=93). Coronary artery ligation (Heart failure model) vs. Sham surgery was evaluated on Oxytocin signaling and GABAergic synaptic activity in the central amygdala. Rats with chronic heart failure exhibited depleted oxytocin content in axonal terminals, downregulated oxytocin receptors, and impaired oxytocin-driven GABAergic synaptic activity in the central amygdala.

synapsesocial.com/papers/6a7459306b20bd397ca7ffeehttps://doi.org/10.1101/2023.11.22.568271
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Also Consider

Synapse has enriched 5 closely related papers on similar clinical questions. Consider them for comparative context:

  1. 1A Multi-Gene Synaptic Plasticity Array Identifies Candidate Molecular Underpinnings of Cognitive and Mood Deficits in Rats with Heart Failure2020
  2. 2Chronic activation of hypothalamic oxytocin neurons improves cardiac function during left ventricular hypertrophy-induced heart failure2017 · 64 citations
  3. 3Brain ‘Ouabain’ Mediates Sympathetic Hyperactivity in Congestive Heart Failure1995 · 78 citations
  4. 4Heart failure‐induced reprogramming of salt‐evoked neurovascular coupling in the rat hypothalamus2026
  5. 5Inhibition of brain proinflammatory cytokine synthesis reduces hypothalamic excitation in rats with ischemia-induced heart failure2008 · 114 citations