Selank vs VIP

Selank

Selank is a synthetic heptapeptide analogue of the naturally occurring immunomodulatory peptide tuftsin (Thr-Lys-Pro-Arg), extended with a Pro-Gly-Pro sequence for modulated metabolic stability. Selank exerts its effects primarily through modulation of the GABAergic system, influencing GABA-A receptor subunit expression and monoamine neurotransmitter metabolism, particularly serotonin and norepinephrine. It also demonstrates immunomodulatory activity by regulating cytokine balance and enhancing phagocytic activity. Research conducted at the Institute of Molecular Genetics in Moscow revealed that Selank significantly altered the expression of 36 genes related to GABAergic neurotransmission in hippocampal tissue (Zozulya et al., 2001). Studies in Bulletin of Experimental Biology and Medicine demonstrated anxiolytic effects comparable to benzodiazepines but without sedation, motor impairment, or dependence risk. Further work by Kozlovskii and Danchev showed that Selank modulated memory trace stability in rodent avoidance tasks, suggesting dual anxiolytic-nootropic activity. Compared to Semax, Selank produces a calming, anxiolytic profile rather than a stimulatory cognitive raise. Where Semax primarily modulates BDNF and melanocortin pathways, Selank operates through GABA modulation and immune regulation. Diazepam and other classical anxiolytics share Selank's target system but carry tolerance and withdrawal risks that research suggests Selank does not. Store lyophilized Selank at -20°C in a desiccated environment. After reconstitution with bacteriostatic water, refrigerate at 2-8°C and use within 3-4 weeks. Selank is primarily studied by neuropharmacologists, behavioral researchers investigating anxiety models, and immunologists examining peptide-based immune modulation.

VIP

VIP (Vasoactive Intestinal Peptide) is a 28-amino acid neuropeptide belonging to the secretin/glucagon superfamily, originally isolated from porcine duodenum by Said and Mutt in 1970. VIP signals through two G-protein coupled receptors, VPAC1 and VPAC2, both of which activate adenylyl cyclase to elevate intracellular cAMP. Widely distributed throughout the central and peripheral nervous systems, VIP functions as a neurotransmitter and neuromodulator with roles in vasodilation, smooth muscle relaxation, exocrine secretion, circadian rhythm regulation, and neuroprotection. Research by Delgado et al. (2004) in Pharmacological Reviews comprehensively characterized VIP's anti-inflammatory properties, demonstrating suppression of TNF-alpha, IL-6, and IL-12 in activated macrophages while upregulating the anti-inflammatory cytokine IL-10. Studies published in the Journal of Neuroscience by Bhatt et al. showed that VIP protected hippocampal neurons from excitotoxic and oxidative damage through VPAC2-mediated cAMP/PKA signaling. Abad et al. in Annals of the New York Academy of Sciences reported that VIP use ameliorated experimental autoimmune encephalomyelitis in murine models, suggesting therapeutic potential in neuroinflammatory conditions. Additional research has shown VIP regulates the suprachiasmatic nucleus master clock, influencing circadian output. Compared to PACAP (Pituitary Adenylate Cyclase-Activating Polypeptide), which shares significant structural homology and receptor overlap, VIP has higher selectivity for VPAC receptors and lower affinity for PAC1 receptors. This makes VIP preferred for research specifically targeting VPAC-mediated pathways rather than the broader PAC1-dependent neuroprotective signaling. VIP is sensitive to degradation. Store lyophilized at -20°C. Reconstitute with bacteriostatic water and store at 2-8°C, using within 2-3 weeks. Studied by neuroscientists, immunologists, chronobiologists, and pulmonary researchers investigating airway smooth muscle regulation.

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