Erschienen in:
Open Access
01.12.2015 | Research article
PEP-1-SOD1 fusion proteins block cardiac myofibroblast activation and angiotensin II-induced collagen production
verfasst von:
Li-Guo Tan, Jun-Hui Xiao, Dan-Li Yu, Lei Zhang, Fei Zheng, Ling-Yun Guo, Jian-Ye Yang, Jun-ming Tang, Shi-You Chen, Jia-Ning Wang
Erschienen in:
BMC Cardiovascular Disorders
|
Ausgabe 1/2015
Abstract
Background
Oxidative stress is closely associated with cardiac fibrosis. However, the effect of copper, zinc-superoxide dismutase (SOD1) as a therapeutic agent is limited due to the insufficient transduction. This study was aimed to investigate the effect of PEP-1-SOD1 fusion protein on angiotensin II (ANG II)-induced collagen metabolism in rat cardiac myofibroblasts (MCFs).
Methods
MCFs were pretreated with SOD1 or PEP-1-SOD1 fusion protein for 2 h followed by incubation with ANG II for 24 h. Cell proliferation was measured by Cell Counting Kit-8. Superoxide anion productions were detected by both fluorescent microscopy and Flow Cytometry. MMP-1 and TIMP-1 were determined by ELISA. Intracellular MDA content and SOD activity were examined by commercial assay kits. Protein expression was analyzed by western blotting.
Results
PEP-1-SOD1 fusion protein efficiently transduced into MCF, scavenged intracellular O2−, decreased intracellular MDA content, increased SOD activity, suppressed ANG II-induced proliferation, reduced expression of TGF-β1, α-SMA, collagen type I and III, restored MMP-1 secretion, and attenuated TIMP-1 secretion.
Conclusion
PEP-1-SOD1 suppressed MCF proliferation and differentiation and reduced production of collagen type I and III. Therefore, PEP-1-SOD1 fusion protein may be a potential novel therapeutic agent for cardiac fibrosis.