title: Potential of a renin inhibitory peptide from the red seaweed Palmaria palmata as a functional food ingredient following confirmation and characterization of a hypotensive effect in spontaneously hypertensive rats.
abstract: This work examined the resistance of the renin inhibitory, tridecapeptide IRLIIVLMPILMA derived previously from a Palmaria palmata papain hydrolysate, during gastrointestinal (GI) transit. Following simulated GI digestion, breakdown products were identified using mass spectrometry analysis and the known renin and angiotensin I converting enzyme inhibitory dipeptide IR was identified. In vivo animal studies using spontaneously hypertensive rats (SHRs) were used to confirm the antihypertensive effects of both the tridecapeptide IRLIIVLMPILMA and the seaweed protein hydrolysate from which this peptide was isolated. After 24 h, the SHR group fed the P. palmata protein hydrolysate recorded a drop of 34 mm Hg in systolic blood pressure (SBP) from 187 (±0.25) to 153 (± 0.64) mm Hg SBP, while the group fed the tridecapeptide IRLIIVLMPLIMA presented a drop of 33 mm Hg in blood pressure from 187 (±0.95) to 154 (±0.94) mm Hg SBP compared to the SBP recorded at time zero. The results of this study indicate that the seaweed protein derived hydrolysate has potential for use as antihypertensive agents and that the tridecapeptide is cleaved and activated to the dipeptide IR when it travels through the GI tract. Both the hydrolysate and peptide reduced SHR blood pressure when administered orally over a 24 h period.
authors: Food Biosciences Department, Teagasc Food Research Centre , Ashtown, Dublin 15, Ireland.
authors: Ciaran
authors: C
authors: Fitzgerald
authors: Rotimi E
authors: RE
authors: Aluko
authors: Mohammad
authors: M
authors: Hossain
authors: Dilip K
authors: DK
authors: Rai
authors: Maria
authors: M
authors: Hayes
mesh_terms: D000818:Animals; D000959:Antihypertensive Agents / Q000008:administration & dosage* / Q000737:chemistry / Q000302:isolation & purification; D001794:Blood Pressure / Q000187:drug effects; D005260:Female; D055951:Functional Food / Q000032:analysis; D006801:Humans; D006973:Hypertension / Q000188:drug therapy* / Q000503:physiopathology; D008297:Male; D009842:Oligopeptides / Q000008:administration & dosage* / Q000737:chemistry / Q000302:isolation & purification; D010936:Plant Extracts / Q000008:administration & dosage* / Q000737:chemistry / Q000302:isolation & purification; D051381:Rats; D011918:Rats, Inbred SHR; D000461:Rhodophyta / Q000737:chemistry*; D012624:Seaweed / Q000737:chemistry*
chemical_list: D000959:Antihypertensive Agents; D009842:Oligopeptides; D010936:Plant Extracts; C027509:renin inhibitory peptide
keywords: in vitro simulated gastrointestinal digestion; red macroalga; renin inhibitory peptides; spontaneously hypertensive rats