Abstract
Huntington’s disease is an autosomal dominant neurodegenerative disease caused by a CAG repeat expansion in the huntingtin gene. Heart disease is the second leading cause of death in patients with Huntington’s disease. This study was to evaluate whether cardiac Fas-dependent and mitochondria-dependent apoptotic pathways are activated in transgenic mice with Huntington’s disease. Sixteen Huntington’s disease transgenic mice (HD) and sixteen wild-type (WT) littermates were studied at 10.5 weeks of age. The cardiac characteristics, myocardial architecture, and two major apoptotic pathways in the excised left ventricle from mice were measured by histopathological analysis, Western blotting, and TUNEL assays. The whole heart weight and the left ventricular weight decreased significantly in the HD group, as compared to the WT group. Abnormal myocardial architecture, enlarged interstitial spaces, and more cardiac TUNEL-positive cells were observed in the HD group. The key components of Fas-dependent apoptosis (TNF-alpha, TNFR1, Fas ligand, Fas death receptors, FADD, activated caspase-8, and activated caspase-3) and the key components of mitochondria-dependent apoptosis (Bax, Bax-to-Bcl-2 ratio, cytosolic cytochrome c, activated caspase-9, and activated caspase-3) increased significantly in the hearts of the HD group. Cardiac Fas-dependent and mitochondria-dependent apoptotic pathways were activated in transgenic mice with Huntington’s disease, which might provide one of possible mechanisms to explain why patients with Huntington’s disease will develop heart failure.
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Acknowledgments
The authors thank Dr Yijuang Chern for offering R6/2 mice and Dr Timothy Williams for proofreading the manuscript. This study was supported by Grants from the National Science Council (NSC 100-2632-B-039-001-MY3 and NSC100-2314-B-039-016-MY) in Taiwan. This study is supported in part by Taiwan Ministry of Health and Welfare Clinical Trial and Research Center of Excellence (MOHW104-TDU-B-212-113002). Some components of the pathway diagram in the current study were modified from the Pathway Central from SABiosciences.
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Chih-Yang Huang and Shin-Da Lee have contributed equally to this work.
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Wu, BT., Chiang, MC., Tasi, CY. et al. Cardiac Fas-Dependent and Mitochondria-Dependent Apoptotic Pathways in a Transgenic Mouse Model of Huntington’s Disease. Cardiovasc Toxicol 16, 111–121 (2016). https://doi.org/10.1007/s12012-015-9318-y
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DOI: https://doi.org/10.1007/s12012-015-9318-y