Macroalgal protein hydrolysates from Palmaria palmata influence the 'incretin effect' in vitro via DPP-4 inhibition and upregulation of insulin, GLP-1 and GIP secretion

Journal article

McLaughlin, C.M., Harnedy-Rothwell, P.A., Lafferty, R.A., Sharkey, S., Parthsarathy, V., Allsopp, P.J., McSorley, E.M., FitzGerald, R.J. and O'Harte, F.P.M. 2021. Macroalgal protein hydrolysates from Palmaria palmata influence the 'incretin effect' in vitro via DPP-4 inhibition and upregulation of insulin, GLP-1 and GIP secretion. European Journal of Nutrition. 60 (8), pp. 4439-4452. https://doi.org/10.1007/s00394-021-02583-3
AuthorsMcLaughlin, C.M., Harnedy-Rothwell, P.A., Lafferty, R.A., Sharkey, S., Parthsarathy, V., Allsopp, P.J., McSorley, E.M., FitzGerald, R.J. and O'Harte, F.P.M.
Abstract

Purpose:
This study investigated metabolic benefits of protein hydrolysates from the macroalgae Palmaria palmata, previously shown to inhibit dipeptidylpeptidase-4 (DPP-4) activity in vitro.

Methods:
Previously, Alcalase/Flavourzyme-produced P. palmata protein hydrolysate (PPPH) improved glycaemia and insulin production in streptozotocin-induced diabetic mice. Here the PPPH, was compared to alternative Alcalase, bromelain and Promod-derived hydrolysates and an unhydrolysed control. All PPPH's underwent simulated gastrointestinal digestion (SGID) to establish oral bioavailability. PPPH's and their SGID counterparts were tested in pancreatic, clonal BRIN-BD11 cells to assess their insulinotropic effect and associated intracellular mechanisms. PPPH actions on the incretin effect were assessed via measurement of DPP-4 activity, coupled with GLP-1 and GIP release from GLUTag and STC-1 cells, respectively. Acute in vivo effects of Alcalase/Flavourzyme PPPH administration on glucose tolerance and satiety were assessed in overnight-fasted mice.

Results:
PPPH's (0.02-2.5 mg/ml) elicited varying insulinotropic effects (p < 0.05-0.001). SGID of the unhydrolysed protein control, bromelain and Promod PPPH's retained, or improved, bioactivity regarding insulin secretion, DPP-4 inhibition and GIP release. Insulinotropic effects were retained for all SGID-hydrolysates at higher PPPH concentrations. DPP-4 inhibitory effects were confirmed for all PPPH's and SGID counterparts (p < 0.05-0.001). PPPH's were shown to directly influence the incretin effect via upregulated GLP-1 and GIP (p < 0.01-0.001) secretion in vitro, largely retained after SGID. Alcalase/Flavourzyme PPPH produced the greatest elevation in cAMP (p < 0.001, 1.7-fold), which was fully retained post-SGID. This hydrolysate elicited elevations in intracellular calcium (p < 0.01) and membrane potential (p < 0.001). In acute in vivo settings, Alcalase/Flavourzyme PPPH improved glucose tolerance (p < 0.01-0.001) and satiety (p < 0.05-0.001).

Conclusion:
Bioavailable PPPH peptides may be useful for the management of T2DM and obesity.

Keywordsdiabetes; obesity; protein hydrolysate; insulin
Year2021
JournalEuropean Journal of Nutrition
Journal citation60 (8), pp. 4439-4452
PublisherSpringer
ISSN1436-6207
1436-6215
Digital Object Identifier (DOI)https://doi.org/10.1007/s00394-021-02583-3
Web address (URL)https://link.springer.com/article/10.1007/s00394-021-02583-3
http://europepmc.org/abstract/med/34081167
Output statusPublished
Publication dates03 Jun 2021
Publication process dates
Accepted11 May 2021
Deposited26 May 2022
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https://repository.derby.ac.uk/item/96yw2/macroalgal-protein-hydrolysates-from-palmaria-palmata-influence-the-incretin-effect-in-vitro-via-dpp-4-inhibition-and-upregulation-of-insulin-glp-1-and-gip-secretion

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