PACAP-38 (16-38), human, mouse, rat demonstrates potent, efficacious, and sustained stimulatory effects on sympathetic neuronal NPY and catecholamine production. PACAP is a potent activator of cAMP formation.
PACAP-38 (16-38), human, mouse, rat is a synthetic peptide fragment derived from the C-terminal region of the pituitary adenylate cyclase-activating polypeptide (PACAP-38), a neuropeptide with significant roles in neurotransmission, neuroprotection, and cellular signaling. This particular sequence, corresponding to residues 16 through 38 of the full-length PACAP-38, is conserved across human, mouse, and rat species, making it a versatile tool for comparative studies in mammalian systems. As a truncated analog, it is frequently utilized to probe the structure-function relationships of PACAP and to dissect receptor subtype selectivity, especially in the context of PAC1, VPAC1, and VPAC2 receptor interactions. Its application in research enables precise modulation and analysis of PACAP-mediated signaling pathways, providing insights into the molecular mechanisms underlying neuroendocrine regulation and cellular communication.
Receptor Antagonism Studies: PACAP-38 (16-38) is widely employed as a selective antagonist in studies investigating PACAP-specific receptor pathways. By competitively binding to PAC1 receptors, the peptide fragment inhibits the action of endogenous PACAP, allowing researchers to delineate the physiological and biochemical consequences of receptor activation versus blockade. This approach is instrumental in characterizing receptor pharmacology, mapping downstream signaling cascades, and distinguishing the contributions of different receptor subtypes in neural and peripheral tissues.
Neuropeptide Functional Analysis: The truncated peptide serves as a valuable molecular probe for dissecting the functional domains of PACAP. By comparing the biological activities of full-length PACAP-38 and its 16-38 fragment, investigators can identify critical residues involved in receptor interaction, signal transduction, and cellular response. Such structure-activity relationship studies are essential for understanding the mechanisms governing neuropeptide specificity, efficacy, and receptor engagement, thereby facilitating the rational design of novel modulators and therapeutic candidates.
Cellular Signaling Research: Researchers utilize PACAP-38 (16-38) in cell-based assays to investigate intracellular signaling events mediated by PACAP receptors. By applying the fragment to cultured neuronal or endocrine cells, it is possible to modulate cyclic AMP production, calcium mobilization, and other second messenger systems. This enables detailed analysis of PACAP-dependent signaling networks, elucidation of cross-talk with other pathways, and assessment of cellular responses to receptor antagonism under various experimental conditions.
Neuroendocrine System Investigation: The peptide fragment is a critical tool in studies focused on the neuroendocrine axis, particularly in elucidating the regulatory roles of PACAP in hormone secretion and stress response. By selectively blocking PACAP signaling in hypothalamic-pituitary or peripheral endocrine models, researchers can assess the impact on hormone release, feedback mechanisms, and neuroendocrine integration. This contributes to a deeper understanding of the physiological functions of PACAP and its relevance to stress adaptation, metabolic control, and homeostatic balance.
Comparative Species Analysis: Due to its conserved sequence across human, mouse, and rat, PACAP-38 (16-38) supports cross-species investigations into peptide-receptor interactions and functional conservation. This enables the study of evolutionary aspects of neuropeptide signaling and facilitates translational research by allowing findings in animal models to be more directly related to human biology. Such comparative analyses are particularly valuable for validating experimental models, optimizing in vitro and in vivo protocols, and advancing the development of receptor-targeted research tools.
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