CREB (cAMP Response Element-Binding Protein)
Definition
A transcription factor activated by cAMP signaling that plays a key role in memory formation, neuronal survival, and neuroplasticity. Nootropic peptides like Semax and Dihexa are studied for their effects on CREB-dependent gene expression.
Related Terms in Signaling Pathways
NF-κB (Nuclear Factor Kappa B)
A protein complex that controls transcription of inflammatory genes. When activated, NF-κB drives production of pro-inflammatory cytokines. Several peptides (KPV, BPC-157, Thymosin Alpha-1) are studied for their ability to inhibit NF-κB, reducing inflammation.
PI3K/AKT/mTOR Pathway
A central intracellular signaling cascade that regulates cell growth, metabolism, survival, and protein synthesis. Activated by growth factors including IGF-1 and insulin. Many anabolic and growth-promoting peptides exert effects through this pathway. mTOR inhibition (e.g., by rapamycin) is a separate longevity research strategy.
AMPK (AMP-Activated Protein Kinase)
A cellular energy sensor activated when ATP levels are low (e.g., during exercise or fasting). AMPK activation promotes glucose uptake, fatty acid oxidation, mitochondrial biogenesis, and autophagy. AICAR (a nucleoside analog, not a peptide) activates AMPK indirectly via its intracellular metabolite ZMP; the mitochondrial-derived peptide MOTS-c also activates AMPK signaling.
BDNF (Brain-Derived Neurotrophic Factor)
A protein that supports neuron survival, growth, and synaptic plasticity. Critical for learning and memory. Several nootropic peptides (Semax, Selank, Cerebrolysin, Dihexa) are studied for their ability to increase BDNF expression.
SNARE Complex
A set of proteins (including SNAP-25, VAMP, and syntaxin) that mediate the fusion of neurotransmitter vesicles with the cell membrane, enabling neurotransmitter release. Botox and the cosmetic peptide SNAP-8 work by inhibiting SNARE complex assembly, reducing muscle contraction.
JAK/STAT Pathway
A signaling pathway used by cytokines, interferons, and growth factors to regulate immune responses, cell growth, and differentiation. Some immunomodulatory peptides interact with JAK/STAT signaling to modulate inflammation.
MAPK/ERK Pathway
A chain of proteins (Ras-Raf-MEK-ERK) that transmits growth signals from cell surface receptors to the nucleus, promoting cell division and differentiation. Relevant to tissue-repair peptides like BPC-157 and growth factors like IGF-1.