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Original Research | Open Access

Restoration of C-type natriuretic peptide and glial fibrillary acidic protein expression in fear centers and intrinsic cardiac ganglia by theta frequency sound during chronic stress in mice

Dow Institute of Medical Technology, Dow University of Health Sciences, 111 Suparco Rd, Gulzar-e-Hijri Gulzar E Hijri Scheme 33, Karachi 75270, Sindh, Pakistan
Transformation International Society, SB-23 & 24 Main University Rd, Gulshan Block 13 C Gulshan-e-Iqbal, Karachi 75300, Sindh, Pakistan
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Graphical Abstract

Schematic representation of the 15-day chronic stress induction and TFS or diazepam (0.3 mg/kg) treatment. Type Ⅰ stressor, exposure of mice to an orbital rotator at 50 rpm; type Ⅱ stressor, 24 hours of starvation; type Ⅲ stressor, exposure to dry heat for 10 minutes; type Ⅳ stressor, exposure to tilted cages for 15 minutes. Chronic stress (CS-15) led to increase in anxious behaviors and reduction in Glial Fibrillary Acidic Protein (GFAP) and C-type Natriuretic Peptide (CNP) expression, while treatment with Theta Frequency Sound (CS-15+TFS) reduced anxiety and restored GFAP and CNP expression comparable to treatment with Diazepam (CS-15+DIA).

Abstract

Background

C-type natriuretic peptide (CNP) can be altered during stress and has protective effects in both the heart and brain; the functions of both organs can be positively affected by CNP modulation. Low arousal sounds can modulate heart–brain communication and improve stress responses. Here, we aimed to explore the modulation of CNP and glial fibrillary acidic protein (GFAP) and neuroprotective effects of low arousal theta frequency sound (TFS).

Methods

Chronic stress was induced in mice (n > 4) using four different stressors on alternate days for 15 days, followed by TFS therapy on alternate days. Open field and elevated plus maze tests were administered for the behavioral analysis, and enzyme-linked immunosorbent assay was used to analyze corticosterone, dopamine, and serotonin levels. Hematoxylin and eosin and cresyl violet staining were used for the morphological analysis of brain and heart sections, and immunohistochemistry for GFAP and CNP was performed.

Results

TFS significantly increased the time spent in the open arms during the elevated plus maze (p < 0.05) and improved exploration in the open field test (p < 0.05). In both tests, decision-making times were significantly reduced by TFS. Nuclear morphology and GFAP expression demonstrated significantly reduced gliosis in fear pathways after TFS therapy x. CNP levels were restored in fear pathways but not intrinsic cardiac ganglia (responsible for heart–brain communication) in TFS-treated mice. Brain corticosterone and dopamine levels increased after TFS therapy, reflecting restored motivational behaviors.

Conclusions

Low arousal TFS is a potential neuromodulator for treating stress and related complications.

Keywords

PsychophysiologyLow arousal musicNeuroprotectionC-type natriuretic peptideStressCardiac nervous system

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Journal of Neurorestoratology
Volume 12 Issue 3,
September 2024
Article number: 100133
DOI: 10.1016/j.jnrt.2024.100133
Cite this article:
Ahmed S, Aftab MF, Ahmed N, et al. Restoration of C-type natriuretic peptide and glial fibrillary acidic protein expression in fear centers and intrinsic cardiac ganglia by theta frequency sound during chronic stress in mice. Journal of Neurorestoratology, 2024, 12(3): 100133. https://doi.org/10.1016/j.jnrt.2024.100133

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Received: 16 November 2023
Revised: 12 April 2024
Accepted: 09 May 2024
Published: 12 June 2024
© 2024 The Authors.

This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/).
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