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Maruyama S, Segawa Y, Harui A, Yamamoto K, Hashimoto H, Osera T, Kurihara N. Influence of Intestinal Barrier on Alleviating an Increase in Blood Pressure by Sodium Alginate Intake in 2-Kidney, 1-Clip Renovascular Hypertensive Rats. Mar Drugs 2023; 21:324. [PMID: 37367649 DOI: 10.3390/md21060324] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/28/2023] [Revised: 05/15/2023] [Accepted: 05/24/2023] [Indexed: 06/28/2023] Open
Abstract
Sodium alginate (SALG) is a substance derived from brown seaweed that has been shown to reduce blood pressure (BP). However, its effects on renovascular hypertension caused by 2-kidney, 1-clip (2K1C) are not yet clear. Previous research suggests that hypertensive rats have increased intestinal permeability, and that SALG improves the gut barrier in inflammatory bowel disease mouse models. Therefore, the goal of this study was to determine whether the antihypertensive effects of SALG involve the intestinal barrier in 2K1C rats. Rats were fed either a 1.0% SALG diet or a control diet for six weeks after being subjected to 2K1C surgery or a sham operation. The systolic BP was measured weekly, and the mean arterial BP was measured at the end of the study. Intestinal samples were taken for analysis, and plasma lipopolysaccharide (LPS) levels were measured. The results showed that BP in 2K1C rats was significantly higher than in SHAM rats when fed CTL, but not when fed SALG. The gut barrier in 2K1C rats was improved by SALG intake. Plasma LPS levels also differed depending on the animal model and diet. In conclusion, dietary SALG may alleviate 2K1C renovascular hypertension by altering the gut barrier.
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Affiliation(s)
- Saki Maruyama
- Hygiene and Preventive Medicine, Graduate School of Home Economics, Kobe Women's University, 2-1 Higashisuma-Aoyama, Suma, Kobe 654-8585, Japan
| | - Yukiko Segawa
- Hygiene and Preventive Medicine, Graduate School of Home Economics, Kobe Women's University, 2-1 Higashisuma-Aoyama, Suma, Kobe 654-8585, Japan
- Faculty of Cookery and Confectionery, Osaka Seikei College, 10-62 Aikawa, Higashiyodogawa, Osaka 533-0007, Japan
| | - Ayaka Harui
- Hygiene and Preventive Medicine, Graduate School of Home Economics, Kobe Women's University, 2-1 Higashisuma-Aoyama, Suma, Kobe 654-8585, Japan
| | - Kanae Yamamoto
- Hygiene and Preventive Medicine, Graduate School of Home Economics, Kobe Women's University, 2-1 Higashisuma-Aoyama, Suma, Kobe 654-8585, Japan
| | - Hiroko Hashimoto
- Hygiene and Preventive Medicine, Graduate School of Home Economics, Kobe Women's University, 2-1 Higashisuma-Aoyama, Suma, Kobe 654-8585, Japan
- Faculty of Nutrition, Osaka Seikei College, 10-62 Aikawa, Higashiyodogawa, Osaka 533-0007, Japan
| | - Tomoko Osera
- Hygiene and Preventive Medicine, Graduate School of Home Economics, Kobe Women's University, 2-1 Higashisuma-Aoyama, Suma, Kobe 654-8585, Japan
- Department of Nutrition and Health Sciences, Toyo University, 1-1-1 Izumino, Ora-gun, Itakura-machi 374-0193, Gunma, Japan
| | - Nobutaka Kurihara
- Hygiene and Preventive Medicine, Graduate School of Home Economics, Kobe Women's University, 2-1 Higashisuma-Aoyama, Suma, Kobe 654-8585, Japan
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Purcell D, Packer MA, Hayes M. Angiotensin-I-Converting Enzyme Inhibitory Activity of Protein Hydrolysates Generated from the Macroalga Laminaria digitata (Hudson) JV Lamouroux 1813. Foods 2022; 11:foods11121792. [PMID: 35741988 PMCID: PMC9222848 DOI: 10.3390/foods11121792] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/10/2022] [Revised: 06/13/2022] [Accepted: 06/14/2022] [Indexed: 02/01/2023] Open
Abstract
Seaweeds have a long history of use as both food and medicine, especially in Asian cultures. Moreover, there is growing interest in the use of seaweed ingredients and bioactive compounds in pharmaceutical and nutraceutical products. One ailment that seaweed bioactive compounds may impact is hypertension caused by the enzyme Angiotensin Converting Enzyme 1 (ACE-1; EC 3.4.15.1), found within the Renin-Angiotensin Aldosterone System (RAAS), which causes vasoconstriction of blood vessels, including veins and arteries. The aim of this paper is to generate bioactive peptide containing protein hydrolysates from the brown seaweed Laminaria digitata (Hudson) JV Lamouroux 1813. Proteins were extracted from this seaweed by disrupting the seaweed cell wall using a combination of carbohydrases and proteolytic enzymes. Bioactive peptide containing permeates were generated from L. digitata protein hydrolysates, and both hydrolysates and permeates were screened for their ability to inhibit the enzyme ACE-1. The protein content of the permeate fractions was found to be 23.87% compared to the untreated seaweed, which contained 15.08% protein using LECO analysis. Hydrolysis and filtration resulted in a “white” protein powder, and the protein content of this powder increased by 9% compared to the whole seaweed. The total amino acid (TAA) content of the L. digitata protein permeate was 53.65 g/100 g of the sample, and contains over 32% essential amino acids (EAA). Furthermore, the L. digitata permeate was found to inhibit the ACE-1 enzyme by 75% when compared to the commercial drug Captopril© when assayed at a concentration of 1 mg/mL. The inhibition of ACE-1 (the IC50 value) of 590 µg/mL for the L. digitata permeate compares well with Captopril©, which had 100% inhibition of ACE-1, with an IC50 value of 500 µg/mL. This study indicates that there is potential to develop protein powders with ACE-1 inhibitory bioactivities from the brown seaweed L. digitata using enzymatic hydrolysis as a cell disruption and protein extraction/hydrolysate generation procedure.
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Affiliation(s)
- Diane Purcell
- Food BioSciences, Teagasc, Ashtown, Dublin 15, D15 DY05 Dublin, Ireland
- Cawthron Institute, 98 Halifax Street, Nelson 7010, New Zealand
| | | | - Maria Hayes
- Food BioSciences, Teagasc, Ashtown, Dublin 15, D15 DY05 Dublin, Ireland
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