Related Experiment Video
Updated: Apr 14, 2026
06:58
Frailty Assessment in an Aging Mouse Model
Published on: September 23, 2025
895
Towards an Evidence-Based Model of Aging.
1Collegiate Professor, University of Maryland, University College, USA. hkatcher@earthlink.net.
Current Aging Science
|April 23, 2015
Summary
Aging is not caused by irreparable cellular damage, challenging evolutionary theories. New principles suggest external factors can control aging at cellular and organismal levels, enabling rejuvenation.
Area of Science:
- Gerontology
- Cellular Biology
- Evolutionary Biology
Background:
- The modern synthesis of evolutionary theory posits aging results from accumulated cellular damage due to inadequate repair mechanisms.
- This perspective implies aging is driven by irreparable damage, hindering the concept of rejuvenation.
Purpose of the Study:
- To propose fundamental principles of mammalian aging based solely on experimental data, independent of evolutionary constraints.
- To challenge the established assumptions regarding the autonomy of cellular and organ aging and the primacy of cellular aging in organismic aging.
Main Methods:
- Re-evaluation of existing experimental data on aging processes.
- Development of new theoretical principles derived from empirical observations.
Main Results:
- Experimental data suggests that aging is not necessarily due to irreparable damage.
- Fundamental assumptions about cell and organ aging as autonomous processes are questioned.
- The centrality of cellular aging in organismic aging is challenged.
Conclusions:
- The hypothesis of aging as a result of irreparable damage should be rejected.
- Aging processes may not be autonomous at cellular and organ levels.
- Exogenous control over age-phenotype at multiple biological organization levels is demonstrated as possible.
More Related Videos
Related Concept Videos
01:26Aging
1.1K
Aging is a complex biological phenomenon influenced by various processes that affect cellular and systemic functions. Several prominent theories attempt to explain its mechanisms, highlighting cellular limitations, oxidative damage, and hormonal changes as central factors in aging.
Cellular Clock Theory
The cellular clock theory posits that the human lifespan is closely tied to the finite capacity of cells to divide, a phenomenon governed by telomeres, which are protective caps at the ends of...
Cellular Clock Theory
The cellular clock theory posits that the human lifespan is closely tied to the finite capacity of cells to divide, a phenomenon governed by telomeres, which are protective caps at the ends of...
1.1K
01:19The Effect of Aging on Tissues
4.2K
Several body functions deteriorate with age. The external signs of aging are easily identifiable. For example, the skin becomes dry, less elastic, and thins out, forming wrinkles. The skin of the face begins to appear looser due to a decrease in the levels of elastic and collagen fibers in the connective tissue. Additionally, melanin production in the hair follicle decreases with age, resulting in gray hair. Moreover, the senses of sight and hearing decline, so glasses and hearing aids may...
4.2K
01:37Mitochondria
21.5K
Mitochondria are eukaryotic cellular organelles that are known to produce energy through a process called oxidative phosphorylation. Besides their primary function, mitochondria are involved in various cellular processes, including cell growth, differentiation, signaling, metabolism, and senescence. Age-related changes cause a decline in mitochondrial quality and integrity due to increased mitochondrial mutations and oxidative damage. Thus, aging can severely impact mitochondrial functions,...
21.5K
01:27Pharmacodynamics in Geriatric Patients: Effects of Age
339
Age-related pharmacokinetic changes are extensively documented, but understanding age-related pharmacodynamic alterations is relatively limited. This knowledge gap can be partly attributed to the complexity of developing appropriate measures of drug responses compared to bioanalytical methods for determining drug concentrations.Most information regarding age-related differences in human pharmacodynamics originates from cross-sectional studies. However, these studies assume that observed mean...
339
01:15Drug Dosing: Geriatric Patients
368
Elderly individuals encompass a diverse population with varying degrees of age-related physiological changes. Defining the elderly presents challenges, as the geriatric population is often arbitrarily categorized as individuals older than 65. However, many individuals in this group lead active and healthy lives, with an increasing number surpassing 85 years and falling into the older elderly category. Physiological changes associated with aging impact performance capacity and homeostatic...
368
01:18Pharmacokinetics in Geriatric Patients: Effect of Age on Drug Metabolism
354
Geriatric patients show significant variation in how their bodies process medications, which can change how effective and safe treatments are. The liver is the primary organ where drug metabolism occurs, involving two main types of chemical reactions: phase I and II. Phase I metabolism is driven by the cytochrome P450 enzyme system, which includes key types such as CYP3A, CYP2D6, and CYP2C9. Research indicates that while aging doesn't notably alter the levels or activity of these enzymes, it...
354