Selank is a neuro-immunomodulatory peptide developed by the Russian Academy of Sciences, which shares similarities with Semax in terms of its molecular structure and biological characteristics. The structure of Selank directly determines its excellent drug-like properties, dual-target specificity, and biological safety. The key features are as follows:
Molecular Structure and Characteristics
1.Optimization of Homologous Structure to Eliminate Side Effects
Core Sequence: The core sequence of Selank is derived from the naturally occurring Tuftsin peptide in the human body, showing high homology. Due to its similarity to the natural sequence, Selank does not trigger immune responses or antibody formation.
C-terminal Structure Optimization: The extended structure at the C-terminal effectively eliminates the pro-inflammatory activity of natural Tuftsin, retaining only its beneficial immune-regulating effects. This optimization significantly improves the safety of the drug.
2.Enhanced Protease Resistance
Pro-Gly-Pro Dipeptide Structure: The rigid Pro-Gly-Pro structure creates spatial hindrance, completely shielding protease cleavage sites like carboxypeptidases and aminopeptidases in the body. Compared to natural Tuftsin, the plasma half-life of Selank is extended by more than 25 times-from just 2 minutes to 4 hours-resulting in a longer duration of action.
3.Blood-Brain Barrier Penetration
Small Molecule Structure: Selank is a linear heptapeptide (molecular weight < 800 Da) with an optimized lipophilicity/water solubility ratio, which allows it to efficiently penetrate the blood-brain barrier. After nasal administration, effective concentrations can be detected in cerebrospinal fluid within 5 minutes, and peak concentrations in the central nervous system are reached within 20 minutes.
4.Dual Target Specificity (Central and Peripheral Systems)
Central and Peripheral Targeting: Selank acts on both the central nervous system and peripheral immune system. In the central nervous system, it preferentially accumulates in key areas for emotional and cognitive regulation, such as the hippocampus, amygdala, and prefrontal cortex. In the peripheral system, it targets immune cells (such as lymphocytes, monocytes, and macrophages), achieving neuroimmune synergistic regulation.
Non-Sedating Active Properties
Unlike traditional anxiolytic drugs, the anxiolytic effect of Selank does not rely on binding to the benzodiazepine receptor, meaning it does not cause sedation, drowsiness, muscle relaxation, or cognitive impairment. It can improve mood while maintaining or even enhancing attention and alertness.
Core Mechanisms of Action
The pharmacological effects of Selank are achieved through multi-target and multi-pathway synergistic regulation, resulting in neuroimmune modulation. The following are its six core mechanisms:
1.Core Anti-Anxiety and Anti-Stress Mechanisms
GABAergic System Regulation: Selank upregulates the expression of glutamate decarboxylase (GAD), promoting the synthesis of the inhibitory neurotransmitter GABA, while inhibiting GABA transaminase activity to reduce GABA degradation. This significantly increases GABA levels in the hippocampus, amygdala, and prefrontal cortex, alleviating anxiety, tension, and panic at the root level.
HPA Axis Suppression: Selank can directly inhibit excessive release of corticotropin-releasing hormone (CRH) from the hypothalamus, blocking the cascade activation of the hypothalamic-pituitary-adrenal (HPA) axis under stress. This reduces cortisol secretion, reverses chronic stress-induced HPA axis dysfunction, and alleviates stress-related anxiety, insomnia, mood disorders, and decreased immunity.
2.Neurotransmitter System Balance Regulation
Serotonergic System: Selank upregulates the synthesis and release of serotonin in the prefrontal cortex and hippocampus, positively regulating the expression of 5-HT1A receptors, improving mood regulation, and alleviating depression and anxiety. Unlike SSRIs, it does not cause sexual dysfunction, weight gain, or gastrointestinal discomfort.
Dopaminergic System: Selank enhances dopamine levels in the prefrontal cortex and striatum, optimizing dopamine D2 receptor expression. This improves attention and executive function, alleviating anxiety-related inattention and mental fatigue, without the addiction or overstimulation effects seen with stimulant drugs.
Norepinephrinergic System: Selank balances the levels of norepinephrine in the central nervous system, inhibiting excessive release due to stress and reducing anxiety-related symptoms like palpitations, sweating, and hypervigilance, without causing sedation or a drop in blood pressure.
Neuroprotection and Neuroplasticity Promotion
Upregulation of Neurotrophic Factors: Selank significantly increases the expression of brain-derived neurotrophic factor (BDNF) and nerve growth factor (NGF) in the hippocampus and prefrontal cortex, promoting dendritic spine formation, synaptogenesis, and synaptic plasticity, thereby enhancing long-term potentiation (LTP) effects and improving cognitive functions like learning, memory, and attention.
Inhibition of Neuronal Apoptosis: Selank activates the PI3K/Akt survival pathway, upregulating anti-apoptotic proteins like Bcl-2 and downregulating pro-apoptotic proteins like Bax and Caspase-3, preventing neuronal apoptosis in the hippocampus induced by chronic stress and oxidative stress, and reversing hippocampal atrophy and cognitive decline.
Immune Balance Regulation (Core Feature Derived from Tuftsin)
Innate Immune Regulation: Selank targets monocytes, macrophages, and neutrophils, enhancing their phagocytic ability to clear pathogens while suppressing excessive activation. It reduces the release of pro-inflammatory cytokines like TNF-α, IL-1β, and IL-6, balancing pro-inflammatory and anti-inflammatory responses and preventing excessive inflammation.
Adaptive Immune Regulation: Selank modulates the proliferation and differentiation of T lymphocytes and B lymphocytes, balancing Th1/Th2/Th17 cell subtypes. It suppresses excessive autoimmune responses and enhances specific immune responses, showing significant effects in regulating allergic diseases, autoimmune diseases, and recurrent infections.
CNS Inflammation Inhibition: Selank suppresses the excessive activation of microglial cells, promoting their polarization to the anti-inflammatory M2 type, reducing the release of pro-inflammatory cytokines in the central nervous system, and alleviating anxiety, cognitive decline, and brain fog induced by neuroinflammation. It also protects the integrity of the blood-brain barrier, preventing peripheral inflammatory factors from entering the brain.
Sleep Quality Improvement Selank regulates the circadian rhythm and emotional pathways, improving sleep quality without the sedative effects and hangover symptoms of hypnotic drugs:
It shortens sleep onset latency, reduces nighttime awakenings, and increases deep sleep duration, enhancing sleep efficiency.
It alleviates anxiety and stress-induced insomnia, early waking, and nightmares, improving sleep architecture without suppressing REM sleep, and leaving no drowsiness or dizziness upon waking.
Addiction Withdrawal Assistance Selank significantly alleviates withdrawal symptoms such as anxiety, irritability, cravings, and insomnia during substance withdrawal, reducing the risk of relapse:
It inhibits excessive activation of the HPA axis and central nervous inflammation caused by alcohol, opioids, amphetamines, and other substances, helping to alleviate anxiety, panic, and emotional breakdowns associated with withdrawal.
It regulates the dopaminergic reward system to alleviate anhedonia and drug cravings associated with withdrawal, and has no addictive properties, making it safe for use as an adjunct to addiction withdrawal treatment.
Clinical Research and Expanding Applications
Selank has been applied in various clinical fields, including:
Sleep Disorders: Improving sleep quality in anxiety and stress-related insomnia without sedative side effects.
Chronic Fatigue Syndrome: Alleviating chronic fatigue, energy loss, and inattention by regulating immune and neurological functions.
Allergic Diseases: Reducing the frequency and severity of allergic rhinitis, bronchial asthma, and atopic dermatitis by modulating Th1/Th2 balance.
Autoimmune Diseases: Assisting in regulating autoimmune responses and reducing inflammation in diseases like rheumatoid arthritis and Hashimoto's thyroiditis.
Immunodeficiency: Enhancing the body's immune defense to reduce the occurrence of infections, especially in patients with recurrent respiratory infections or post-surgical immunodeficiency.
Age-Related Cognitive Decline: Improving memory, attention, and delaying cognitive decline in the elderly.
Post-COVID Syndrome (Long COVID): Alleviating brain fog, chronic fatigue, anxiety, and sleep disorders associated with long COVID by regulating central nervous system inflammation and immune function.
Addiction Withdrawal: Assisting in the withdrawal process from alcohol, opioids, amphetamines, and nicotine, alleviating withdrawal symptoms, and reducing the risk of relapse.
Perioperative Stress Management: Reducing preoperative anxiety and modulating immune function post-surgery to reduce infections and complications associated with surgical stress.
Conclusion
Selank is a neuro-immunomodulatory peptide with broad clinical applications, offering significant advantages due to its unique molecular structure and multi-target mechanism. It can effectively improve mood, cognition, immune function, and sleep quality, while also assisting in addiction withdrawal and addressing a range of neurological and immune-related disorders.
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