title: One-week antihypertensive effect of Ile-Gln-Pro in spontaneously hypertensive rats.
abstract: The antihypertensive effect of an angiotensin I-converting enzyme (ACE) inhibitory peptide Ile-Gln-Pro (IQP), whose sequence was derived from Spirulina platensis , was investigated in spontaneously hypertensive rats (SHRs) for 1 week. The weighted systolic blood pressure (SBP) and diastolic blood pressure (DBP) of the peptide IQP-treated group were significantly lower than those of the negative control group from the third and fourth days, respectively. Accompanying the blood pressure reduction, a significant regulation of the expression of major components of the renin-angiotensin system (RAS) was found in the treatment group, including downregulation of the mRNA levels of renin, ACE, and the angiotensin II type 1 (AT1) receptor in the kidney, as well as serum angiotensinogen (Ang), ACE, and angiotensin II (Ang II) concentrations. The treatment group also showed upregulation of mRNA expression of the angiotensin II type 2 (AT2) receptor in the kidney. Our findings suggested that IQP might be of potential use in the treatment of hypertension.
authors.affiliation: Department of Applied Biological Chemistry, Graduate School of Agricultural and Life Sciences, The University of Tokyo, Tokyo 113-8657, Japan.
authors.forename: Jun
authors.initials: J
authors.lastname: Lu
authors.forename: Yoriko
authors.initials: Y
authors.lastname: Sawano
authors.forename: Takuya
authors.initials: T
authors.lastname: Miyakawa
authors.forename: You-Lin
authors.initials: YL
authors.lastname: Xue
authors.forename: Mu-Yi
authors.initials: MY
authors.lastname: Cai
authors.forename: Yukari
authors.initials: Y
authors.lastname: Egashira
authors.forename: Di-Feng
authors.initials: DF
authors.lastname: Ren
authors.forename: Masaru
authors.initials: M
authors.lastname: Tanokura
mesh_terms: D000818:Animals; D000959:Antihypertensive Agents / Q000008:administration & dosage*; D001794:Blood Pressure / Q000187:drug effects; D004195:Disease Models, Animal; D015870:Gene Expression / Q000187:drug effects; D006801:Humans; D006973:Hypertension / Q000188:drug therapy* / Q000235:genetics / Q000378:metabolism / Q000503:physiopathology; D008297:Male; D010455:Peptides / Q000008:administration & dosage*; D051381:Rats; D011918:Rats, Inbred SHR; D012083:Renin / Q000235:genetics / Q000378:metabolism
chemical_list: D000959:Antihypertensive Agents; D010455:Peptides; D012083:Renin