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• W2022795275 abstract "Pancreatic polypeptide (PP) is synthesized as an amino-terminal moiety of a precursor peptide and is released into plasma during stimulation as an amidated hormone (PP1–36). The purpose of this investigation was to ascertain the immunoreactive forms of PP in human plasma using HPLC chromatographic technique. Plasma was obtained from five normal volunteers under various postprandial intervals and from the Blood Bank. PP in each plasma sample was processed for HPLC analysis by immunoprecipitation and/or immunoaffinity extractions. Migration patterns of PP-forms were identified under isocratic elution. This study shows that human plasma contains four distinct immunoreactive (IR) forms of PP during stimulation by a protein-rich meal. These forms are PP1–36 (peak 4), PP3–36 (peak 3) and unidentified material migrating as peak 2 and peak 1. The corresponding migration constants were Kav 0.828 ± 0.004, Kav 0.790 ± 0.003, Kav 0.570 ± 0.009 and Kav 0.409 ± 0.007, respectively. The predominant fasting from of IR PP chromatographed as peak 1, while peaks 2 and 4 were reduced in amplitude. The 1 h and 3 h postprandial chromatograms of HPLC profiles of plasma PP were similar in shape but lower in relative magnitude and amplitude. The authenticity of peak 4 as the migration of native PP1–36 was confirmed using purified IR native PP1–36 extracted from human pancreas. Partial amino acid sequence analysis of PP peak 3 revealed deletions of two N-terminal amino acid residues. The chemical identities of peaks 1 and 2 are unknown but appear to differ from PP in peaks 3 and 4 by virtue of their migration profiles. It is concluded that there are at least four distinct IR forms of PP in human plasma. Native PP1–36 accounts for less than 1% of total PP after an overnight fast and is about 13 of total postprandial IR plasma PP. Discernment of the nature and etiology of forms of PP in plasma may provide a new understanding of the role of PP in mammalian physiology." @default.
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• W2022795275 date "1991-05-01" @default.
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• W2022795275 title "Patterns of immunoreactive pancreatic polypeptide in human plasma" @default.
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• W2022795275 doi "https://doi.org/10.1016/0167-0115(91)90230-e" @default.
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