Biomarkers of ageing are biological parameters of an organism that either alone or in some multivariate composite will, in the absence of disease, better predict functional capability at some late age than will chronological age. In humans and non-human primates, these include indicators such as blood pressure, body mass index, fasting glucose levels, and cholesterol levels.
Some potential biomarkers of ageing may include:
1. Telomere length: Telomeres are the ends of chromosomes that shorten as cells divide. The length of these telomeres is often used as a biomarker for ageing, as shorter telomeres are associated with shorter lifespans.
2. Epigenetic changes: As we age, there are changes in how our genes are expressed, or "turned on and off." These changes can be used as biomarkers for ageing.
3. Protein levels: Certain proteins in the blood can increase or decrease with age, such as C-reactive protein (associated with inflammation) and albumin (a measure of nutritional status).
4. Genetic mutations: Over time, our DNA can accumulate damage or mutations, which can be used as a biomarker for ageing.
5. Mitochondrial function: Our mitochondria (the "powerhouse" of the cell) tend to decline in function as we age, which can also be used as a biomarker for ageing.
In non-human primates, similar biomarkers can be used. However, there may also be species-specific markers. For example, in rhesus monkeys, the level of dehydroepiandrosterone sulfate (DHEAS) in the blood decreases with age, which has been considered as a potential biomarker of ageing in this species.
It's critical to note that most of these biomarkers indicate correlations rather than causation, and further research is necessary to identify reliable and consistent biomarkers of ageing in humans and non-human primates. |
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