Evaluation of Experimental Autoimmune Myocarditis by Cardiac Magnetic Resonance Feature Tracking and Its Mechanism
10.3969/j.issn.1005-5185.2025.05.007
- VernacularTitle:心脏磁共振特征追踪技术评价实验性自身免疫性心肌炎及其机制
- Author:
Chunhua WANG
1
;
Zhetao WANG
;
Jing ZHU
;
Yu ZHANG
;
Peng ZHOU
;
Fabao GAO
Author Information
1. 四川省肿瘤医院&研究所,四川省肿瘤临床医学研究中心,四川省癌症防治中心,电子科技大学附属肿瘤医院影像科,四川 成都 610041
- Publication Type:Journal Article
- Keywords:
Myocarditis;
Immune system diseases;
Magnetic resonance imaging;
Feature tracking;
Strain;
Ferroptosis;
Rats
- From:
Chinese Journal of Medical Imaging
2025;33(5):485-492
- CountryChina
- Language:Chinese
-
Abstract:
Purpose To quantitatively evaluate myocardial three-dimensional strains using cardiac magnetic resonance feature tracking,investigate whether ferroptosis contributes to myocardial injury in experimental autoimmune myocarditis(EAM),and explore the relationship between strains and ferroptosis biomarkers.Materials and Methods EAM was induced in Lewis rats via subcutaneous injections with porcine cardiac myosin emulsified in same amount of complete Freund's adjuvant.Both EAM(n=15)and control(n=15)rats underwent 7T cardiac magnetic resonance and were euthanatized at day 21.Cardiac magnetic resonance assessments included left ventricular function and strains.The cardiac damage and ferroptosis-related markers were measured with histopathology,serology,Western blot and polymerase chain reaction.Results The left ventricular ejection fraction declined in the rats post-immunization with porcine cardiac myosin at day 21(t=7.86,P<0.001).Global,basal,middle and apical strains encompassing radial strain,circumferential strain and longitudinal strain were significantly lower in the EAM group compared to the control group(t=2.61-10.45,P<0.05).Cardiac and inflammatory biomarkers,including lactate dehydrogenase,cardiac troponin I and interferon γ indicated myocardial injury in EAM group compared to the control group(t=16.54,21.20,16.06,all P<0.001).Prussian blue staining revealed iron overload in EAM group.Compared to the control group,malondialdehyde and reactive oxygen significantly increased in EAM group(t=15.75,3.47,both P<0.01),and superoxide dismutase were significantly decreased(t=14.21,P<0.001).Western blot and histopathology showed that the protein expression of ferritin heavy chain was significantly higher in the EAM group compared to the control group(t=5.15,P<0.01).The solute carrier family 7 member 11/glutathione/glutathione peroxidase 4 axis was down regulated at serum,mRNA and protein expression levels in EAM group(t=7.73-30.14,all P<0.001).Global circumferential and longitudinal strains were significantly associated with ferroptosis biomarkers(r=-0.854-0.829,all P<0.05).Conclusion Cardiac magnetic resonance feature tracking has the potential to quantitatively evaluate myocardial damage of EAM which involves ferroptosis.The strains are related with ferroptosis biomarkers.
