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Decrease in ATP biosynthesis and dysfunction of biological membranes. Two possible key mechanisms of phenoptosis
1Center for Rehabilitation Medicine, Dnepropetrovsk, 49000, Ukraine. alex-rjechewsky@mail.ru.
Abstract:
Metabolic syndrome is extremely prevalent in the world and can be considered as one of main factors leading to accelerated aging and premature death. This syndrome may be closely linked with age-related disruptions in hypothalamic-pituitary system function, which perhaps represent a trigger mechanism of development of endocrine and cardiovascular pathologies. Age-related elevation of the sensitivity threshold of the hypothalamus to regulatory signals in association with low mobility and excessive diet trigger a cascade of biochemical reactions that might be used for activation of programmed death of the organism - phenoptosis. Accumulation of fatty acids in a cell and resulting lipotoxicity include resistance to insulin and leptin, endoplasmic reticulum stress, uncoupling of oxidation and phosphorylation, and dysfunction of biological membranes. Decrease in ATP synthesis is correlated with accumulation of calcium ions in cells, dysfunction of mitochondria, and increasing apoptotic activity. Age-related activation of mTOR (which is greatly influenced by excess energy substrates) has deleterious impact on one of the main mechanisms of cell defense by which defective mitochondria are replaced: mitophagy and biogenesis of mitochondria will be suppressed, and this will increase in greater degree mitochondrial dysfunction and oxidative stress. Fatty acid-induced inflammation will increase activity of nuclear factor NF-κB, the well-known stimulator of age-related pathologies. The final stage of phenoptosis can be represented by endothelium dysfunction related with oxidative stress, insulin resistance, and the most prevalent cardiovascular pathologies.
Insights
Metabolic syndrome accelerates aging and premature death by disrupting hypothalamic function. This leads to cellular damage, mitochondrial dysfunction, and inflammation, ultimately causing cardiovascular issues.
Area of Science:
- Endocrinology
- Gerontology
- Cellular Biology
Background:
- Metabolic syndrome is a global health concern linked to accelerated aging and mortality.
- Age-related hypothalamic-pituitary dysfunction may trigger endocrine and cardiovascular diseases.
- Lifestyle factors like poor diet and low mobility exacerbate age-related metabolic dysregulation.
Purpose of the Study:
- To explore the link between metabolic syndrome, aging, and programmed cell death (phenoptosis).
- To elucidate the cellular mechanisms underlying metabolic syndrome-associated aging and pathology.
- To investigate the role of hypothalamic sensitivity, lipotoxicity, and mitochondrial dysfunction in phenoptosis.
Main Methods:
- Review of current literature on metabolic syndrome, aging, and cellular pathways.
- Analysis of biochemical cascades triggered by age-related hypothalamic changes and lifestyle factors.
- Examination of molecular mechanisms including lipotoxicity, insulin/leptin resistance, endoplasmic reticulum stress, and mitochondrial dynamics.
Main Results:
- Accumulation of fatty acids leads to lipotoxicity, causing insulin resistance, endoplasmic reticulum stress, and membrane dysfunction.
- Decreased ATP synthesis correlates with calcium overload, mitochondrial dysfunction, and increased apoptosis.
- Age-related mTOR activation impairs mitophagy and mitochondrial biogenesis, worsening mitochondrial dysfunction and oxidative stress.
- Fatty acid-induced inflammation activates NF-κB, promoting age-related pathologies.
- Phenoptosis culminates in endothelium dysfunction, insulin resistance, and cardiovascular diseases.
Conclusions:
- Metabolic syndrome significantly contributes to accelerated aging and premature death through complex cellular and molecular pathways.
- Dysregulation of hypothalamic function, lipotoxicity, and mitochondrial dysfunction are key drivers of phenoptosis.
- Targeting these pathways may offer strategies to mitigate age-related diseases and improve longevity.
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