1
|
Telomeres and telomerase in risk assessment of cardiovascular diseases. Exp Cell Res 2020; 397:112361. [PMID: 33171154 DOI: 10.1016/j.yexcr.2020.112361] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/27/2020] [Accepted: 11/02/2020] [Indexed: 01/14/2023]
Abstract
Telomeres are repetitive nucleoprotein structures located at the ends of chromosomes. Reduction in the number of repetitions causes cell senescence. Cells with high proliferative potential age with each replication cycle. Post-mitotic cells (e.g. cardiovascular cells) have a different aging mechanism. During the aging of cardiovascular system cells, permanent DNA damage occurs in the telomeric regions caused by mitochondrial dysfunction, which is a phenomenon independent of cell proliferation and telomere length. Mitochondrial dysfunction is accompanied by increased production of reactive oxygen species and development of inflammation. This phenomenon in the cells of blood vessels can lead to atherosclerosis development. Telomere damage in cardiomyocytes leads to the activation of the DNA damage response system, histone H2A.X phosphorylation, p53 activation and p21 and p16 protein synthesis, resulting in the SASP phenotype (senescence-associated secretory phenotype), increased inflammation and cardiac dysfunction. Cardiovascular cells show the activity of the TERT subunit of telomerase, an enzyme that prevents telomere shortening. It turns out that disrupting the activity of this enzyme can also contribute to the formation of cardiovascular diseases. Measurements of telomere length according to the "blood-muscle" model may help in the future to assess the risk of cardiovascular complications in people undergoing cardiological procedures, as well as to assess the effectiveness of some drugs.
Collapse
|
2
|
Bøtker HE, Cabrera-Fuentes HA, Ruiz-Meana M, Heusch G, Ovize M. Translational issues for mitoprotective agents as adjunct to reperfusion therapy in patients with ST-segment elevation myocardial infarction. J Cell Mol Med 2020; 24:2717-2729. [PMID: 31967733 PMCID: PMC7077531 DOI: 10.1111/jcmm.14953] [Citation(s) in RCA: 42] [Impact Index Per Article: 10.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/06/2019] [Revised: 11/26/2019] [Accepted: 11/27/2019] [Indexed: 12/16/2022] Open
Abstract
Pre‐clinical studies have indicated that mitoprotective drugs may add cardioprotection beyond rapid revascularization, antiplatelet therapy and risk modification. We review the clinical efficacy of mitoprotective drugs that have progressed to clinical testing comprising cyclosporine A, KAI‐9803, MTP131 and TRO 40303. Whereas cyclosporine may reduce infarct size in patients undergoing primary angioplasty as evaluated by release of myocardial ischaemic biomarkers and infarct size imaging, the other drugs were not capable of demonstrating this effect in the clinical setting. The absent effect leaves the role of the mitochondrial permeability transition pore for reperfusion injury in humans unanswered and indicates that targeting one single mechanism to provide mitoprotection may not be efficient. Moreover, the lack of effect may relate to favourable outcome with current optimal therapy, but conditions such as age, sex, diabetes, dyslipidaemia and concurrent medications may also alter mitochondrial function. However, as long as the molecular structure of the pore remains unknown and specific inhibitors of its opening are lacking, the mitochondrial permeability transition pore remains a target for alleviation of reperfusion injury. Nevertheless, taking conditions such as ageing, sex, comorbidities and co‐medication into account may be of paramount importance during the design of pre‐clinical and clinical studies testing mitoprotective drugs.
Collapse
Affiliation(s)
- Hans Erik Bøtker
- Department of Cardiology, Aarhus University Hospital, Aarhus N, Denmark
| | - Hector Alejandro Cabrera-Fuentes
- SingHealth Duke-NUS Cardiovascular Sciences Academic Clinical Programme and Cardiovascular and Metabolic Disorders Program, Duke-National University of Singapore Medical School, Singapore, Singapore.,National Heart Research Institute Singapore, National Heart Centre, Singapore, Singapore.,Institute of Biochemistry, Medical School, Justus-Liebig University, Giessen, Germany.,Tecnologico de Monterrey, Centro de Biotecnologia-FEMSA, Monterrey, Mexico.,Institute of Fundamental Medicine and Biology, Kazan (Volga Region) Federal University, Kazan, Russian Federation
| | - Marisol Ruiz-Meana
- Vall d'Hebron Institut de Recerca, University Hospital Vall d'Hebron-Universitat Autònoma, Barcelona, Spain.,Centro de Investigación Biomédica en Red-CV, CIBER-CV, Spain
| | - Gerd Heusch
- Institute for Pathophysiology, West German Heart and Vascular Center, University of Essen. Medical School, Essen, Germany
| | - Michel Ovize
- CarMeN Laboratory, Hôpital Louis Pradel, Hospices Civils de Lyon, Université de Lyon and Explorations Fonctionnelles Cardiovasculaires, INSERM U1060, Lyon, France
| |
Collapse
|