Peptide Humanin

Peptide humanin is a short peptide encoded by the mitochondrial genome, consisting of 24 amino acids,
Its sequence is Met-Ala-Pro-Arg-Gly-Phe-Ser-Cys-Leu-Leu-Leu-Leu-Thr-Ser-Glu-Ile-Asp-Leu-Pro-Val-Lys-Arg-Arg-Ala. As the first mitochondrial derived peptide (MDP) discovered, Humanin is highly conserved in evolution and exists in various species such as humans, naked mole rats, nematodes, etc. Its level decreases with age, but significantly increases in the offspring of centenarians, suggesting a close relationship with lifespan regulation. Preclinical studies have also revealed that it is closely related to the maintenance of mitochondrial function, and a decrease in its level is associated with an increased risk of age-related diseases such as AD and mitochondrial encephalomyopathy. Although its clinical application is still limited to the field of scientific research, its potential as an anti-aging and disease intervention target has attracted widespread attention, and may provide new strategies for the treatment of neurodegenerative diseases, cardiovascular diseases, and metabolic syndrome in the future.

 

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As a class of neuroprotective peptides or active ingredients, peptide humanin (human body) have shown important value in maintaining brain health, improving cognitive function, preventing and treating neurodegenerative diseases, and other aspects.

The application in the field of cognitive health covers the full stage intervention from mild cognitive impairment (MCI) to Alzheimer's disease (AD), improving memory, attention, and executive function through multi-target action.

Delaying cognitive decline

 

Its antioxidant components (such as KOXpqq and ergotamine) can clear free radicals and reduce oxidative stress damage to memory related brain areas such as the hippocampus. For example, the TG type Omega-3 component in Swisse high concentration fish oil can reduce amyloid deposition in the brain, which is one of the core pathological markers of AD. Long term supplementation can significantly reduce the risk of MCI or AD transformation in healthy elderly individuals, providing long-term protection for brain health.

Enhance learning and memory abilities

 

Improving learning and memory processes by enhancing synaptic plasticity and neurotransmitter release. For example, phosphatidylserine in enkephalin can promote membrane fluidity of brain cells and accelerate neural signal transmission; DHA algae oil supports the integrity of neuronal membrane structure and improves information processing efficiency. Clinical studies have shown that after taking neuroprotective products for 3 months, subjects' scores in cognitive tests such as vocabulary memory and logical reasoning significantly improved, verifying the effectiveness in improving cognitive function.

Peptide humanin as a mitochondrial derived peptide (MDP), the discovery and research process of Humanin not only reveals the new role of mitochondria in cell biology, but also brings new hope to fields such as anti-aging, neuroprotection, and metabolic disease treatment. The following is a detailed review of the discovery and development history of Humanin.

The discovery can be traced back to the early 21st century, when scientists were working to find proteins that could protect neurons from toxic substances associated with Alzheimer's disease (AD). Alzheimer's disease is a serious neurodegenerative disease characterized by massive neuronal death, and toxic substances such as beta amyloid (A β) are considered key factors leading to neuronal apoptosis. In 2001, three independent research teams almost simultaneously discovered Humanin.

These three findings collectively reveal the existence of mitochondrial derived peptides as a neuroprotective agent. Encoded by the mitochondrial 16S ribosomal RNA gene (MT-RNR2), it is a small molecule polypeptide composed of 24 amino acids. Its structure contains a three turn alpha helix with no symmetry, which provides the basis for its interaction with various cellular receptors and enables it to perform multiple biological functions within the cell.

After the discovery of Humanin, scientists quickly began studying its biological functions. Early studies have shown that Humanin has strong anti apoptotic ability and can protect neurons from AD related toxic substances such as A β, APP mutants, and presenilin 1 and 2 that induce apoptosis. These toxic substances accumulate in the brains of AD patients, leading to neuronal death and cognitive decline, and the emergence of Humanin provides a new strategy to combat these toxic substances.

In addition, Humanin can protect cells from various stress injuries by inhibiting oxidative stress, reducing inflammatory responses, and other mechanisms. Oxidative stress and inflammatory response are important mechanisms for cell damage and disease occurrence, and Humanin can regulate these processes to maintain cellular homeostasis and health.

As research deepens, scientists have discovered that Humanin is not only present in humans, but also widely present in various species such as naked mole rats and nematodes, and exhibits high conservation among different species. This conservatism suggests that Humanin may play an important role in the evolutionary process, and its functions may have similarities across different species, providing a broader model for studying the biological functions of Humanin.

1. Anti aging research

In recent years, significant progress has been made in the field of anti-aging research. Research has shown that the level of Humanin decreases with age, but significantly increases in centenarians and their offspring. This association prompt may be closely related to lifespan regulation. Animal experiments have shown that nematodes overexpressing Humanin significantly prolong their lifespan, and this extension depends on the daf-16/FoxO signaling pathway. Daf-16/FoxO is an important transcription factor that plays a crucial role in cellular stress response, metabolic regulation, and lifespan regulation. It may promote cellular stress resistance and metabolic health by activating the daf-16/FoxO signaling pathway, thereby extending lifespan.

In addition, exogenous supplementation of Humanin analogs (such as HNG) can improve metabolic parameters, reduce inflammatory markers, and delay cognitive decline in mice. These studies provide strong support for the development of anti-aging drugs. For example, in metabolism, its analogues can improve insulin sensitivity and glucose tolerance of mice, reduce blood sugar and lipid levels, and thus prevent the occurrence of metabolic diseases such as diabetes. In terms of cognition, its analogues can reduce A β deposition and neuroinflammation in the mouse brain, protect neurons from damage, and thus delay cognitive decline and the occurrence of Alzheimer's disease.

2. Neuroprotection and Disease Treatment

The neuroprotective effect makes it a potential candidate drug for treating neurodegenerative diseases such as AD, Parkinson's disease, etc. Research has shown that Humanin can protect neurons from damage by inhibiting neuronal apoptosis, reducing oxidative stress, and inflammatory responses. In the AD model, it can reduce A β - induced neuronal death and synaptic loss, and improve cognitive function in mice. In addition, Humanin can promote the proliferation and differentiation of neural stem cells, facilitating nerve repair and regeneration. Neural stem cells have self-renewal and multipotent differentiation potential, and can differentiate into neurons, astrocytes, oligodendrocytes, etc., participating in the repair and regeneration of the nervous system. H may promote the repair and regeneration of the nervous system by regulating the proliferation and differentiation of neural stem cells, thereby treating neurodegenerative diseases.

3. Treatment of metabolic diseases

It has also shown potential in the field of metabolic disease treatment. Research shows that it can promote insulin sensitivity, regulate metabolic adaptation, and has therapeutic effect on metabolic diseases such as diabetes. Insulin sensitivity refers to the ability of cells to respond to insulin. The decline of insulin sensitivity is one of the important mechanisms of metabolic diseases such as diabetes. It is possible to improve blood glucose control by regulating the insulin signaling pathway and increasing cell sensitivity to insulin. In addition, it can protect the cardiovascular system from oxidative stress and inflammatory damage, and reduce the risk of cardiovascular diseases such as atherosclerosis. Cardiovascular disease is one of the important complications of metabolic diseases, and its antioxidant and anti-inflammatory effects can protect the cardiovascular system from damage and prevent the occurrence of cardiovascular disease.

Although it has shown great potential in anti-aging, neuroprotection, and treatment of metabolic diseases, its clinical application still faces many challenges. Future research needs to further elucidate the detailed mechanism of action, receptor binding characteristics, and pharmacokinetic properties in order to optimize its administration strategy and peptide structure. For example, it is necessary to determine the specific targets and signaling pathways within the cell, as well as their binding modes and affinities with different receptors. These pieces of information are crucial for developing more effective Humanin analogs and drugs.

In addition, large-scale population cohort studies are crucial for verifying the value as reliable biomarkers. By collecting a large number of samples and data from the population, analyzing the relationship between level and age, disease status, etc., it can be determined whether it can be used as a biomarker for predicting aging and disease risk. This will provide a more solid scientific basis for the clinical application of peptide humanin.

Meanwhile, with the continuous development of technologies such as gene editing and cell therapy, the application prospects will be even broader. For example, gene editing technology can be used to introduce its genes into specific cells for sustained expression, thereby exerting long-term protective effects. Alternatively, cell therapy techniques can be used to transplant cells expressing it into damaged tissues, promoting tissue repair and regeneration. These new technologies will provide more possibilities for the clinical application of Humanin.

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