08 May 2016 : Animal Research
Parkin Regulates Mitochondrial Autophagy After Myocardial Infarction in Rats
Li WuABCDEFG, Xiemuziya MaimaitirexiatiABCDEF, Yun JiangACDFG, Liang LiuABCEFDOI: 10.12659/MSM.898722
Med Sci Monit 2016; 22:1553-1559
Abstract
BACKGROUND: To study the role of Parkin in the regulation of mitochondrial autophagy in the heart by assessing mitochondrial autophagy and changes in Parkin protein expression in rat myocardium after myocardial infarction (MI).
MATERIAL AND METHODS: Rats were randomly assigned to three groups: control, sham, and MI. Four weeks after induction of MI, ultrasonic examination of the rats was performed to measure left ventricular end systolic diameter (LVESD), left ventricular end diastolic diameter (LVEDD), left ventricular ejection fraction (EF), left ventricular fractional shortening (FS), and left ventricular diastolic/systolic volume. Rat myocardium was collected from each group and examined for changes in morphology, size, and amount of mitochondria and autophagosomes by transmission electronic microscopy. A Western blot was performed to analyze the levels of Parkin and the autophagy-related protein LC3.
RESULTS: Four weeks after MI, cardiac function of the MI rats was impaired compared with the control rats. Both LVESD and LVEDD were elevated in the MI rats (p<0.05) while EF was decreased, indicating that the MI model was constructed successfully. After MI, increased numbers of mitochondria and autophagosomes were observed in the myocardium (p<0.05), and the mitochondrial morphology was destroyed. Chloroquine (CQ) treatment increased the number of autophagosomes in the myocardium of the control rats (p<0.05) but not in MI rats (p>0.05). In addition, the levels of the autophagy-related proteins LC3II/LC3I were elevated in the myocardium after MI (p<0.05) and the activity of Parkin was significantly reduced (p<0.05).
CONCLUSIONS: Under conditions of chronic MI, mitochondrial dysfunction and disruption of autophagosomal clearance are associated with Parkin expression.
Keywords: Autophagy - physiology, Autophagy-Related Proteins - metabolism, Mitochondria, Heart - pathology, Myocardium - pathology, Random Allocation, Ubiquitin-Protein Ligases - metabolism, Ventricular Remodeling - physiology
Editorial
01 April 2024 : Editorial
Editorial: Forty Years of Waiting for Prevention and Cure of HIV Infection – Ongoing Challenges and Hopes for Vaccine Development and Overcoming Antiretroviral Drug ResistanceDOI: 10.12659/MSM.944600
Med Sci Monit 2024; 30:e944600
In Press
21 Mar 2024 : Meta-Analysis
Economic Evaluation of COVID-19 Screening Tests and Surveillance Strategies in Low-Income, Middle-Income, a...Med Sci Monit In Press; DOI: 10.12659/MSM.943863
10 Apr 2024 : Clinical Research
Predicting Acute Cardiovascular Complications in COVID-19: Insights from a Specialized Cardiac Referral Dep...Med Sci Monit In Press; DOI: 10.12659/MSM.942612
06 Mar 2024 : Clinical Research
Enhanced Surgical Outcomes of Popliteal Cyst Excision: A Retrospective Study Comparing Arthroscopic Debride...Med Sci Monit In Press; DOI: 10.12659/MSM.941102
06 Mar 2024 : Clinical Research
Prevalence and Variation of Medical Comorbidities in Oral Surgery Patients: A Retrospective Study at Jazan ...Med Sci Monit In Press; DOI: 10.12659/MSM.943884
Most Viewed Current Articles
17 Jan 2024 : Review article
Vaccination Guidelines for Pregnant Women: Addressing COVID-19 and the Omicron VariantDOI :10.12659/MSM.942799
Med Sci Monit 2024; 30:e942799
14 Dec 2022 : Clinical Research
Prevalence and Variability of Allergen-Specific Immunoglobulin E in Patients with Elevated Tryptase LevelsDOI :10.12659/MSM.937990
Med Sci Monit 2022; 28:e937990
16 May 2023 : Clinical Research
Electrophysiological Testing for an Auditory Processing Disorder and Reading Performance in 54 School Stude...DOI :10.12659/MSM.940387
Med Sci Monit 2023; 29:e940387
01 Jan 2022 : Editorial
Editorial: Current Status of Oral Antiviral Drug Treatments for SARS-CoV-2 Infection in Non-Hospitalized Pa...DOI :10.12659/MSM.935952
Med Sci Monit 2022; 28:e935952