Pinealon / 99% purity / 20mg PI20 / Neuroprotection / Brain Function Improvement

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1.            Pinealon (also known as the EDR tripeptide) is one of the representative molecules of ultra-short peptide bioregulators. Developed by the team of Vladimir Khavinson at the St. Petersburg Institute of Bioregulation and Gerontology in Russia, its core sequence is Glutamic acid-Aspartic acid-Arginine (Glu-Asp-Arg). It is a typical research subject in peptide bioregulation theory. Characterized by an extremely low molecular weight, direct nuclear regulation of gene expression, and the ability to penetrate the blood-brain barrier, it is currently primarily applied in the form of research-grade raw materials in basic and preclinical studies in fields such as neurobiology and geriatric medicine.

   1. Molecular Structure and Core Parameters

        Pinealon is a standard linear tripeptide that belongs to the category of ultra-short peptides (USPs) (defined as having ≤4 amino acid residues). Its core structural parameters are as follows:

   • Amino Acid Sequence: Glu-Asp-Arg (single-letter abbreviation: EDR).
   • Free Peptide Molecular Weight: Approximately 418.4 Da (fluctuating in the range of 370–432 Da depending on the salt form or crystalline water state).
   • Molecular Formula: Primarily C₁₅H₂₆N₆O₈ (in the free state).
   • Structural Characteristics: The N-terminus is acidic glutamic acid, the middle is acidic aspartic acid, and the C-terminus is basic arginine. The overall structure is amphiphilic and carries a net charge at physiological pH. The guanidino side chain of arginine is the key site for its membrane permeability and biological activity.

   2. Physicochemical Properties

   • Appearance: White to off-white lyophilized powder with no odor.
   • Solubility: Highly soluble in water, physiological saline, and other aqueous systems; also soluble in certain polar organic solvents (e.g., DMSO).
   • Stability: Due to its extremely low molecular weight and lack of complex higher-order structures, it remains stable for over 2 years when stored in sealed conditions at -20°C in a solid state. After reconstitution, it can be stored at 2–8°C for about 30 days. Its resistance to enzymatic degradation is significantly superior to that of long-chain polypeptides.
   • Membrane Permeability: Its molecular weight is well below the threshold of the blood-brain barrier (500 Da), and the arginine residue confers transmembrane penetration capabilities, allowing it to enter neurons and the cell nucleus without the need for receptor mediation.

2. Its core mechanisms of action primarily include the following aspects:

   1. Epigenetic Regulation and Gene Expression
       Pinealon can cross the blood-brain barrier and directly enter the nucleus of neurons. Its specific amino acid sequence (Glu-Asp-Arg) enables it to bind to specific DNA regulatory regions on chromatin. This binding does not alter the DNA sequence itself but changes the compactness of the chromatin, making specific gene regions more accessible to transcription factors, thereby upregulating the expression of neuroprotective-related genes.

   2. Upregulation of Neurotrophic Factors
        Through the aforementioned gene regulatory mechanisms, Pinealon can significantly increase the expression of brain-derived neurotrophic factor (BDNF), nerve growth factor (NGF), and glial cell line-derived neurotrophic factor (GDNF). These proteins are crucial for neuroplasticity, dendritic growth, synaptic maintenance, and the formation of long-term memory. Studies have shown that Pinealon can increase BDNF expression in the hippocampus by 45–60%.

   3. Antioxidative Stress and Inhibition of Apoptosis
        Pinealon can upregulate genes encoding antioxidant enzymes (such as superoxide dismutase [SOD] and catalase [CAT]), thereby enhancing the cell's endogenous antioxidant capacity and reducing the accumulation of reactive oxygen species (ROS) and lipid peroxidation damage. Simultaneously, it inhibits the abnormal activation of extracellular signal-regulated kinases 1/2 (ERK1/2), blocks harmful signal transduction pathways, reduces spontaneous cell death (apoptosis), and maintains neuronal homeostasis.

   4. Improvement of Mitochondrial Function and Energy Metabolism
        Brain tissue is a high-oxygen-consuming organ, and the decline in mitochondrial function is closely related to cognitive impairment. Pinealon can improve neuronal energy metabolism by upregulating the expression of mitochondrial biogenesis factors (such as PGC-1α), increasing mitochondrial membrane potential, and boosting ATP production. This fundamentally addresses the energy deficiency caused by aging or metabolic stress.

   5. Neuroendocrine and Circadian Rhythm Regulation
        In addition to direct neuroprotection, Pinealon can also act on the pineal gland and the hypothalamic-pituitary-adrenal (HPA) axis. It helps restore the natural synthesis of melatonin, improves the synchronization of the sleep-wake cycle, and regulates the secretion of stress hormones (such as cortisol), thereby enhancing the body's adaptability to stress and maintaining neuroendocrine homeostasis.

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