TLQP 21 is a VGF-derived peptide, spans residues 556-576 of the precursor sequence. Protects cerebellar granule cells (CGCs) from serum and potassium deprivation-induced apoptosis. Increases energy expenditure and prevents early phase diet-induced diabetes.
TLQP 21 is a biologically active peptide derived from the C-terminal region of the VGF protein, a neuropeptide precursor widely expressed in the central and peripheral nervous systems. As a member of the VGF-derived peptide family, TLQP 21 has garnered substantial attention due to its modulatory roles in energy homeostasis, neuroendocrine signaling, and metabolic regulation. Its unique amino acid sequence enables specific interactions with cellular receptors, making it a valuable tool for probing peptide-receptor mechanisms and neurobiological pathways. Researchers utilize TLQP 21 to investigate its involvement in physiological processes, particularly those linked to neuropeptide signaling, metabolic adaptation, and cellular stress responses.
Peptide-receptor interaction studies: TLQP 21 is frequently employed in experimental models to elucidate the molecular mechanisms underlying neuropeptide-receptor interactions. Its well-characterized structure allows for detailed examination of binding specificity and downstream signaling events, providing insight into the functional dynamics of G protein-coupled receptors (GPCRs) and related transduction pathways. By applying TLQP 21 in receptor binding assays and functional readouts, researchers can dissect the contributions of VGF-derived peptides to neural communication and regulatory circuits.
Metabolic research: The peptide is widely used in metabolic studies to assess its impact on energy expenditure, lipid metabolism, and glucose homeostasis. TLQP 21's ability to modulate metabolic parameters has made it a model compound for exploring the physiological regulation of adipose tissue function, insulin sensitivity, and overall energy balance. Experimental applications often involve in vitro and in vivo systems to determine how peptide signaling influences metabolic adaptation under various nutritional and environmental conditions.
Neurobiological pathway analysis: TLQP 21 serves as a pivotal molecular probe for mapping neuroendocrine circuits and understanding the integration of neural and hormonal signals. By introducing the peptide into neuronal cultures or animal models, investigators can monitor changes in neurotransmitter release, synaptic plasticity, and neurotrophic factor expression. These studies contribute to a deeper understanding of how VGF-derived peptides participate in brain function, stress adaptation, and behavioral responses.
Cell signaling investigation: The peptide is utilized to investigate intracellular signaling cascades activated by neuropeptide ligands. Researchers apply TLQP 21 in cell-based assays to monitor activation of second messenger systems, such as cyclic AMP and calcium flux, as well as downstream transcriptional responses. These experiments provide valuable data on the specificity and kinetics of signal transduction events initiated by peptide ligands, advancing knowledge of cell communication and regulatory feedback mechanisms.
Peptide structure-activity relationship (SAR) studies: TLQP 21 is an important reference molecule for structure-activity relationship investigations within the VGF peptide family. By synthesizing and testing analogs or truncated versions, researchers can delineate the critical residues responsible for biological activity, receptor affinity, and functional selectivity. Such SAR analyses are essential for identifying pharmacophores, optimizing peptide-based probes, and informing the design of novel modulators targeting neuropeptide pathways.
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