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    Acylated apelin-13 amide analogues exhibit enzyme resistance and prolonged insulin releasing, glucose lowering and anorexic properties

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    Authors
    O'Harte, Finbarr P. M.
    Parthsarathy, Vadivel cc
    Hogg, Christopher
    Flatt, Peter R.
    Issue Date
    2017-10-04
    
    Metadata
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    Abstract
    The adipokine, apelin has many biological functions but its activity is curtailed by rapid plasma degradation. Fatty acid derived apelin analogues represent a new and exciting avenue for the treatment of obesity-diabetes. This study explores four novel fatty acid modified apelin-13 analogues, namely, (Lys8GluPAL)apelin-13 amide, pGlu(Lys8GluPAL)apelin-13 amide, Lys8GluPAL(Tyr13)apelin-13 and Lys8GluPAL(Val13)apelin-13. Fatty acid modification extended the half-life of native apelin-13 to >24 h in vitro. pGlu(Lys8GluPAL)apelin-13 amide was the most potent insulinotropic analogue in BRIN-BD11 cells and isolated islets with maximal stimulatory effects of up to 2.7-fold (p < .001). (Lys8GluPAL)apelin-13 amide (1.9-fold) and Lys8GluPAL(Tyr13)apelin-13 (1.7-fold) were less effective, whereas Lys8GluPAL(Val13)apelin-13 had an inhibitory effect on insulin secretion. Similarly, pGlu(Lys8GluPAL)apelin-13 amide was most potent in increasing beta-cell intracellular Ca2+ concentrations (1.8-fold, p < .001) and increasing glucose uptake in 3T3-L1 adipocytes (2.3-fold, p < .01). Persistent biological action was observed with both pGlu(Lys8GluPAL)apelin-13 amide and (Lys8GluPAL)apelin-13 amide significantly reducing blood glucose (39–43%, p < .01) and enhancing insulin secretion (43–56%, p < .001) during glucose tolerance tests in diet-induced obese mice. pGlu(Lys8GluPAL)apelin-13 amide and (Lys8GluPAL)apelin-13 amide also inhibited feeding (28–40%, p < .001), whereas Lys8GluPAL(Val13)apelin-13 increased food intake (8%, p < .05) in mice. These data indicate that novel enzymatically stable analogues of apelin-13 may be suitable for future development as therapeutic agents for obesity-diabetes.
    Citation
    O'Harte, Finbarr, Parthsarathy, Vadivel, Hogg, Christopher and Flatt, Peter (2017) Acylated apelin-13 amide analogues exhibit enzyme resistance and prolonged insulin releasing, glucose lowering and anorexic properties. Biochemical Pharmacology, 146 . pp. 165-173.
    Publisher
    Elsevier
    Journal
    Biochemical Pharmacology
    URI
    http://hdl.handle.net/10545/622905
    DOI
    10.1016/j.bcp.2017.10.002
    Additional Links
    http://uir.ulster.ac.uk/38767/
    Type
    Journal article
    ISSN
    0006-2952
    ae974a485f413a2113503eed53cd6c53
    10.1016/j.bcp.2017.10.002
    Scopus Count
    Collections
    Environmental Sustainability Research Centre

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