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• W2019809103 abstract "Chromogranin A (CgA) is a member of the granin family of molecules found in secretory granules of endocrine and neuro-endocrine cells. Here, we have identified a new 23-mer CgA-derived peptide secreted from pituitary AtT-20 cells, which we named pyroGlu-serpinin (pGlu-serpinin). LC–MS studies of peptides in conditioned medium of AtT-20 cells indicate that pGlu-serpinin is derived from initial processing of mouse CgA at paired basic residues, Arg461–Arg462 and Arg433–Arg434, to yield a previously described 26 amino acid peptide, serpinin. Three amino acids are then cleaved from the N terminus of serpinin, yielding a peptide with an N-terminal glutamine, which is then subsequently pyroglutaminated. Immunocytochemistry showed co-localization of pGlu-serpinin with adrenocorticotropic hormone in secretory granules of AtT-20 cells, and it was released in an activity-dependent manner. Functional studies demonstrated that pGlu-serpinin was able to prevent radical oxygen species (hydrogen peroxide)-induced cell death of AtT-20 cells and cultured rat cerebral cortical neurons at a concentration of 1 and 10 nM, respectively. These data indicate that pGlu-serpinin has anti-apoptotic effects that may be important in neuroprotection of central nervous system neurons and pituitary cells. Furthermore, pGlu-serpinin added to the media of AtT-20 cells up-regulated the transcription of the serine protease inhibitor, protease nexin-1 (PN-1) mRNA. pGlu-serpinin’s ability to increase levels of PN-1, a potent inhibitor of plasmin released during inflammatory processes causing cell death, may play a role in protecting cells under adverse pathophysiological conditions." @default.
• W2019809103 created "2016-06-24" @default.
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• W2019809103 date "2011-05-03" @default.
• W2019809103 modified "2023-09-23" @default.
• W2019809103 title "Role of pGlu-Serpinin, a Novel Chromogranin A-Derived Peptide in Inhibition of Cell Death" @default.
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• W2019809103 doi "https://doi.org/10.1007/s12031-011-9521-7" @default.
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