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Abstract
It is well established that humans and other mammals are minimally regenerative compared with organisms such as zebrafish, salamander or amphibians. In recent years, however, the identification of regenerative potential in neonatal mouse tissues that normally heal poorly in adults has transformed our understanding of regenerative capacity in mammals. In this Review, we survey the mammalian tissues for which regenerative or improved neonatal healing has been established, including the heart, cochlear hair cells, the brain and spinal cord, and dense connective tissues. We also highlight common and/or tissue-specific mechanisms of neonatal regeneration, which involve cells, signaling pathways, extracellular matrix, immune cells and other factors. The identification of such common features across neonatal tissues may direct therapeutic strategies that will be broadly applicable to multiple adult tissues.
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Affiliation(s)
| | - Alice H. Huang
- Department of Orthopedic Surgery, Columbia University, New York, NY 10032, USA
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Pilz PM, Ward JE, Chang WT, Kiss A, Bateh E, Jha A, Fisch S, Podesser BK, Liao R. Large and Small Animal Models of Heart Failure With Reduced Ejection Fraction. Circ Res 2022; 130:1888-1905. [PMID: 35679365 DOI: 10.1161/circresaha.122.320246] [Citation(s) in RCA: 20] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Heart failure (HF) describes a heterogenous complex spectrum of pathological conditions that results in structural and functional remodeling leading to subsequent impairment of cardiac function, including either systolic dysfunction, diastolic dysfunction, or both. Several factors chronically lead to HF, including cardiac volume and pressure overload that may result from hypertension, valvular lesions, acute, or chronic ischemic injuries. Major forms of HF include hypertrophic, dilated, and restrictive cardiomyopathy. The severity of cardiomyopathy can be impacted by other comorbidities such as diabetes or obesity and external stress factors. Age is another major contributor, and the number of patients with HF is rising worldwide in part due to an increase in the aged population. HF can occur with reduced ejection fraction (HF with reduced ejection fraction), that is, the overall cardiac function is compromised, and typically the left ventricular ejection fraction is lower than 40%. In some cases of HF, the ejection fraction is preserved (HF with preserved ejection fraction). Animal models play a critical role in facilitating the understanding of molecular mechanisms of how hearts fail. This review aims to summarize and describe the strengths, limitations, and outcomes of both small and large animal models of HF with reduced ejection fraction that are currently used in basic and translational research. The driving defect is a failure of the heart to adequately supply the tissues with blood due to impaired filling or pumping. An accurate model of HF with reduced ejection fraction would encompass the symptoms (fatigue, dyspnea, exercise intolerance, and edema) along with the pathology (collagen fibrosis, ventricular hypertrophy) and ultimately exhibit a decrease in cardiac output. Although countless experimental studies have been published, no model completely recapitulates the full human disease. Therefore, it is critical to evaluate the strength and weakness of each animal model to allow better selection of what animal models to use to address the scientific question proposed.
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Affiliation(s)
- Patrick M Pilz
- Stanford Cardiovascular Institute, Stanford University School of Medicine, CA (P.M.P., E.B., R.L.).,Ludwig Boltzmann Institute at the Center for Biomedical Research, Medical University of Vienna, Austria (P.M.P., A.K., B.K.P.)
| | - Jennifer E Ward
- Department of Medicine, Brigham and Women's Hospital, Harvard Medical School, MA (J.E.W., S.F., R.L.)
| | - Wei-Ting Chang
- Institute of Clinical Medicine, College of Medicine, National Cheng Kung University, Taiwan (W.-T.C.).,Department of Cardiology, Chi-Mei Medical Center, Taiwan (W.-T.C.)
| | - Attila Kiss
- Ludwig Boltzmann Institute at the Center for Biomedical Research, Medical University of Vienna, Austria (P.M.P., A.K., B.K.P.)
| | - Edward Bateh
- Stanford Cardiovascular Institute, Stanford University School of Medicine, CA (P.M.P., E.B., R.L.)
| | - Alokkumar Jha
- Stanford Cardiovascular Institute, Stanford University School of Medicine, CA (P.M.P., E.B., R.L.)
| | - Sudeshna Fisch
- Department of Medicine, Brigham and Women's Hospital, Harvard Medical School, MA (J.E.W., S.F., R.L.)
| | - Bruno K Podesser
- Ludwig Boltzmann Institute at the Center for Biomedical Research, Medical University of Vienna, Austria (P.M.P., A.K., B.K.P.)
| | - Ronglih Liao
- Stanford Cardiovascular Institute, Stanford University School of Medicine, CA (P.M.P., E.B., R.L.).,Department of Medicine, Brigham and Women's Hospital, Harvard Medical School, MA (J.E.W., S.F., R.L.)
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