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  • Title: Vasopressin(1-8) (des-glycinamide9-[Arg8]vasopressin) is an endogenous peptide present in rat plasma.
    Author: Laczi F, Burbach JP, Van der Kleij AA, De Wied D, Wiegant VM.
    Journal: Peptides; 1991; 12(2):329-32. PubMed ID: 2067985.
    Abstract:
    Using a radioimmunoassay for [Arg8]vasopressin(1-8) (des-glycinamide9-[Arg8]vasopressin; DGAVP) endogenous immunoreactive DGAVP (IR-DGAVP) was detected in extracts of plasma prepared from trunk blood of male Wistar rats. The IR-DGAVP was further characterized by reversed-phase high pressure liquid chromatography (HPLC). One of the two immunoreactive peaks obtained by HPLC coeluted with synthetic DGAVP and did not cross-react in a radioimmunoassay specific for [Arg8]vasopressin(1-9) (AVP). The other showed the chromatographical and radioimmunological characteristics of AVP. Analysis by HPLC of plasma prepared from fresh blood spiked with 3H-AVP indicated that under the experimental conditions employed no DGAVP was formed during extraction. The results indicate that DGAVP is present in rat plasma, possibly as an endogenous metabolite of AVP.
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