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Angiotensin-(3–7) alleviates isoprenaline-induced cardiac remodeling via attenuating cAMP-PKA and PI3K/Akt signaling pathways

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Abstract

The renin–angiotensin system is involved in the regulation of various heart diseases. The present study aimed to determine the effects of angiotensin (Ang)-(3–7) on cardiac remodeling and its downstream signaling pathways in neonatal rat cardiomyocytes (NRCMs) and neonatal rat cardiac fibroblasts (NRCFs). The administration of Ang-(3–7) alleviated isoprenaline (ISO)-induced cardiac hypertrophy and fibrosis of mice. ISO treatment increased the levels of atrial natriuretic peptide (ANP), brain natriuretic peptide (BNP) and beta-myosin heavy chain (β-MHC) in NRCMs, and reduced the levels of collagen I, collagen III, fibronectin, and alpha-smooth muscle actin (α-SMA) in NRCFs. These changes were inhibited by Ang-(3–7) administration. The levels of protein kinase A (PKA), phosphorylated phosphatidylinositol-3-kinase (p-PI3K), and phosphorylated protein kinase B (p-Akt) were increased in NRCMs and NRCFs treated with ISO. The increase of PKA, but not p-PI3K or p-Akt was attenuated by Ang-(3–7) treatment in NRCMs. The increases of p-PI3K and p-Akt, but not PKA were reversed by Ang-(3–7) treatment in NRCFs. Treatment with cAMP or PKA overexpression reversed the attenuating effects of Ang-(3–7) on ISO-induced hypertrophy of NRCMs. The administration of PI3K inhibitor or Akt inhibitor alleviated ISO-induced fibrosis of NRCFs. These results indicated that Ang-(3–7) could alleviate cardiac remodeling. The administration of Ang-(3–7) attenuated hypertrophy of NRCMs via inhibiting the cAMP/PKA signaling pathway, and alleviated fibrosis of NRCFs via inhibiting PI3K/Akt signaling pathway.

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Data availability

Data available with corresponding author.

Abbreviations

Ang:

Angiotensin

ANP:

Atrial natriuretic peptide

BNP:

Brain natriuretic peptide

BW:

Body weight

HW:

Heart weight

ISO:

Isoprenaline

LV:

Left ventricular

LVAWd:

LV anterior wall thickness in diastole

LVAWs:

LV anterior wall thickness in systole

LVPWd:

LV posterior wall thickness in diastole

LVPWs:

LV posterior wall thickness in systole

MHC:

Myosin heavy chain

NRCF:

Neonatal rat cardiac fibroblast

NRCM:

Neonatal rat cardiomyocyte

PI3K:

Phosphatidylinositol-3-kinase

PKA:

Protein kinase A

RAAS:

Renin–angiotensin–aldosterone system

SMA:

Smooth muscle actin

TL:

Tibia length

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Authors and Affiliations

Authors

Contributions

YZ performed the study, and critically revised the manuscript. ZS analyzed the data and drafted the manuscript. AL conceived and designed the study, and revised manuscript. All authors read and approved the final manuscript.

Corresponding author

Correspondence to Aijun Liu.

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Conflict of interest

All authors declare that no competing financial interests exist.

Ethical approval

All procedures performed in studies involving animals were in accordance with the ethical standards of Binhai County People's Hospital in which the studies were conducted.

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Handling editor: H. Jakubowski.

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Supplementary Information

Below is the link to the electronic supplementary material.

726_2021_3074_MOESM1_ESM.tif

Supplementary file1 Figure S1. Effects of angiotensin (Ang)-(3-7) on ejection fraction (EF) and fractional shortening (FS). There is no significance between the four groups. Values represent mean ± SEM. *p < 0.05 versus Saline group; #p < 0.05 versus ISO group. n = 8 for each group. (TIF 50 KB)

726_2021_3074_MOESM2_ESM.tif

Supplementary file2 Figure S2. Effects of angiotensin (Ang)-(3-7) on isoprenaline (ISO)-induced hypertension. Ang-(3-7) attenuated the increases of systolic blood pressure (SBP), diastolic blood pressure (DBP) and mean artery pressure (MAP) of mice treated with ISO. Values represent mean ± SEM. *p < 0.05 versus Saline group; #p < 0.05 versus ISO group. n = 8 for each group. (TIF 78 KB)

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Zhang, Y., Shang, Z. & Liu, A. Angiotensin-(3–7) alleviates isoprenaline-induced cardiac remodeling via attenuating cAMP-PKA and PI3K/Akt signaling pathways. Amino Acids 53, 1533–1543 (2021). https://doi.org/10.1007/s00726-021-03074-9

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  • DOI: https://doi.org/10.1007/s00726-021-03074-9

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