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Strauss-Kruger M, Pieters M, van Zyl T, Kruger R, Jacobs A, Jansen van Vuren E, Louw R, Mels CCMC. Urinary metabolomics signature of animal and plant protein intake and its association with 24-h blood pressure: the African-PREDICT study. Hypertens Res 2024; 47:2456-2470. [PMID: 38965426 PMCID: PMC11374704 DOI: 10.1038/s41440-024-01767-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/26/2024] [Revised: 05/24/2024] [Accepted: 06/06/2024] [Indexed: 07/06/2024]
Abstract
The contrasting relationships of plant and animal protein intake with blood pressure (BP) may be partially attributed to the differential non-protein (e.g., saturated fat and fibre) and amino acid (AA) compositions. This study determined whether animal and plant protein intake were related to differential metabolomic profiles associated with BP. This study included 1008 adults from the African-PREDICT study (aged 20-30 years). Protein intake was determined using 24-h dietary recalls. Twenty-four-hour ambulatory BP was measured. Amino acids and acylcarnitines were analysed in spot urine samples using liquid chromatography-tandem mass spectrometry-based metabolomics. Participants with a low plant, high animal protein intake had higher SBP (by 3 mmHg, p = 0.011) than those with high plant, low animal protein intake (low-risk group). We found that the relationships of plant and animal protein intake with 24-h SBP were partially mediated by BMI and saturated fat intake, which were independently associated with SBP. Protein intake was therefore not related to SBP in multiple regression analysis after adjusting for confounders. In the low-risk group, methionine (Std. β = -0.217; p = 0.034), glutamic acid (Std. β = -0.220; p = 0.031), glycine (Std. β = -0.234; p = 0.025), and proline (Std. β = -0.266; p = 0.010) were inversely related to SBP, and beta-alanine (Std. β = -0.277; p = 0.020) to DBP. Ultimately a diet high in animal and low in plant protein intake may contribute to higher BP by means of increased BMI and saturated fat intake. Conversely, higher levels of urinary AAs observed in adults consuming a plant rich diet may contribute to lower BP.
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Affiliation(s)
- Michél Strauss-Kruger
- Hypertension in Africa Research Team (HART), North-West University, Potchefstroom, 2520, North-West Province, South Africa
- SAMRC Extramural Unit for Hypertension and Cardiovascular Disease, Faculty of Health Sciences, North-West University, Potchefstroom, South Africa
| | - Marlien Pieters
- SAMRC Extramural Unit for Hypertension and Cardiovascular Disease, Faculty of Health Sciences, North-West University, Potchefstroom, South Africa
- Centre of Excellence for Nutrition (CEN), North-West University, Potchefstroom, 2520, South Africa
| | - Tertia van Zyl
- SAMRC Extramural Unit for Hypertension and Cardiovascular Disease, Faculty of Health Sciences, North-West University, Potchefstroom, South Africa
- Centre of Excellence for Nutrition (CEN), North-West University, Potchefstroom, 2520, South Africa
| | - Ruan Kruger
- Hypertension in Africa Research Team (HART), North-West University, Potchefstroom, 2520, North-West Province, South Africa
- SAMRC Extramural Unit for Hypertension and Cardiovascular Disease, Faculty of Health Sciences, North-West University, Potchefstroom, South Africa
| | - Adriaan Jacobs
- Hypertension in Africa Research Team (HART), North-West University, Potchefstroom, 2520, North-West Province, South Africa
- SAMRC Extramural Unit for Hypertension and Cardiovascular Disease, Faculty of Health Sciences, North-West University, Potchefstroom, South Africa
| | - Esmé Jansen van Vuren
- Hypertension in Africa Research Team (HART), North-West University, Potchefstroom, 2520, North-West Province, South Africa
- SAMRC Extramural Unit for Hypertension and Cardiovascular Disease, Faculty of Health Sciences, North-West University, Potchefstroom, South Africa
| | - Roan Louw
- Human Metabolomics, North-West University, Potchefstroom, 2520, North-West Province, South Africa
| | - Carina C M C Mels
- Hypertension in Africa Research Team (HART), North-West University, Potchefstroom, 2520, North-West Province, South Africa.
- SAMRC Extramural Unit for Hypertension and Cardiovascular Disease, Faculty of Health Sciences, North-West University, Potchefstroom, South Africa.
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2
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Kalaycı R, Bingül İ, Soluk-Tekkeşin M, Olgaç V, Bekpınar S, Uysal M. The effect of glycine on oxidative stress, inflammation and renin-angiotensin system in kidneys and aorta of cyclosporine-administered rats. Drug Chem Toxicol 2024; 47:473-482. [PMID: 37338155 DOI: 10.1080/01480545.2023.2219036] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/03/2023] [Accepted: 05/07/2023] [Indexed: 06/21/2023]
Abstract
Cyclosporine A (CsA) is an immunosuppressive drug, used in organ transplantations. Oxidative stress, inflammation and renin-angiotensin system (RAS) activation play an important role in CsA-toxicity. Glycine (Gly) has antioxidant and anti-inflammatory effects. In this study, Gly was investigated for its protective role against CsA-induced toxicity. CsA (20 mg/kg/day; subcutaneously) was administered to rats along with Gly injection (250 or 1000 mg/kg; intraperitoneally) for 21 days. Renal function markers [serum urea and creatinine and urinary protein and kidney injury molecule levels and creatinine clearance values] together with histopathological examinations were performed. Oxidative stress (reactive oxygen species, thiobarbutiric acid reactive substances, advanced oxidation products of protein, glutathione, ferric reducing anti-oxidant power and 4-hydroxynonenal levels), and inflammation (myeloperoxidase activity) were determined in kidney tissue. The RAS system [angiotensin II (Ang II) levels, and mRNA expressions of angiotensin converting enzyme (ACE), angiotensin II type-I receptor (AT1R)] and NADPH-oxidase 4 (NOX4) were measured in kidney and aorta. CsA caused significant disturbances in renal function markers, increases in oxidative stress and inflammation parameters and renal damage. Serum angiotensin II levels and mRNA expressions of ACE, AT1R and NOX4 elevated in the aorta and kidney of CsA-rats. Gly, especially its high-dose, alleviated renal function markers, oxidative stress, inflammation and renal damage in CsA-rats. Moreover, serum Ang II levels and mRNA expressions of ACE, AT1R and NOX4 decreased significantly in aorta and kidney in CsA-rats due to Gly treatment. Our results indicate that Gly may be useful for the prevention of CsA-induced renal and vascular toxicity.
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Affiliation(s)
- Rivaze Kalaycı
- Department of Laboratory Animals Science, Aziz Sancar Institude of Experimental Medicine, Istanbul University, Istanbul, Turkey
| | - İlknur Bingül
- Department of Medical Biochemistry, Istanbul Faculty of Medicine, Istanbul University, Istanbul, Turkey
| | - Merva Soluk-Tekkeşin
- Department of Pathology, Oncology Institute, Istanbul University, Istanbul, Turkey
| | - Vakur Olgaç
- Department of Pathology, Oncology Institute, Istanbul University, Istanbul, Turkey
| | - Seldağ Bekpınar
- Department of Medical Biochemistry, Istanbul Faculty of Medicine, Istanbul University, Istanbul, Turkey
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3
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Vargas MH, Chávez J, Del-Razo-Rodríguez R, Muñoz-Perea C, Romo-Domínguez KJ, Báez-Saldaña R, Rumbo-Nava U, Guerrero-Zúñiga S. Glycine by enteral route does not improve major clinical outcomes in severe COVID-19: a randomized clinical pilot trial. Sci Rep 2024; 14:11566. [PMID: 38773199 PMCID: PMC11109244 DOI: 10.1038/s41598-024-62321-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/28/2023] [Accepted: 05/15/2024] [Indexed: 05/23/2024] Open
Abstract
There is a worrying scarcity of drug options for patients with severe COVID-19. Glycine possesses anti-inflammatory, cytoprotective, endothelium-protective, and platelet-antiaggregant properties, so its use in these patients seems promising. In this open label, controlled clinical trial, inpatients with severe COVID-19 requiring mechanical ventilation randomly received usual care (control group) or usual care plus 0.5 g/kg/day glycine by the enteral route (experimental group). Major outcomes included mortality, time to weaning from mechanical ventilation, total time on mechanical ventilation, and time from study recruitment to death. Secondary outcomes included laboratory tests and serum cytokines. Patients from experimental (n = 33) and control groups (n = 23) did not differ in basal characteristics. There were no differences in mortality (glycine group, 63.6% vs control group, 52.2%, p = 0.60) nor in any other major outcome. Glycine intake was associated with lower fibrinogen levels, either evaluated per week of follow-up (p < 0.05 at weeks 1, 2, and 4) or as weighted mean during the whole hospitalization (608.7 ± 17.7 mg/dl vs control 712.2 ± 25.0 mg/dl, p = 0.001), but did not modify any other laboratory test or cytokine concentration. In summary, in severe COVID-19 glycine was unable to modify major clinical outcomes, serum cytokines or most laboratory tests, but was associated with lower serum fibrinogen concentration.Registration: ClinicalTrials.gov NCT04443673, 23/06/2020.
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Affiliation(s)
- Mario H Vargas
- Departamento de Investigación en Hiperreactividad Bronquial, Instituto Nacional de Enfermedades Respiratorias Ismael Cosío Villegas, Calzada de Tlalpan 4502, CP 14080, Ciudad de México, México.
| | - Jaime Chávez
- Departamento de Investigación en Hiperreactividad Bronquial, Instituto Nacional de Enfermedades Respiratorias Ismael Cosío Villegas, Calzada de Tlalpan 4502, CP 14080, Ciudad de México, México
| | - Rosangela Del-Razo-Rodríguez
- Servicio Clínico de Neumología Pediátrica, Instituto Nacional de Enfermedades Respiratorias Ismael Cosío Villegas, Ciudad de México, México
| | - Carolina Muñoz-Perea
- Servicio de Urgencias, Instituto Nacional de Enfermedades Respiratorias Ismael Cosío Villegas, Ciudad de México, México
| | - Karina Julieta Romo-Domínguez
- Servicio de Urgencias, Instituto Nacional de Enfermedades Respiratorias Ismael Cosío Villegas, Ciudad de México, México
- Servicio de Neumología, Hospital Infantil del Estado de Sonora, Hermosillo, Sonora, México
| | - Renata Báez-Saldaña
- Servicio Clínico 3, Instituto Nacional de Enfermedades Respiratorias Ismael Cosío Villegas, Ciudad de México, México
| | - Uriel Rumbo-Nava
- Servicio Clínico 3, Instituto Nacional de Enfermedades Respiratorias Ismael Cosío Villegas, Ciudad de México, México
| | - Selene Guerrero-Zúñiga
- Unidad de Medicina del Sueño, Instituto Nacional de Enfermedades Respiratorias Ismael Cosío Villegas, Ciudad de México, México
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Trejo-Moreno C, Alvarado-Ojeda ZA, Méndez-Martínez M, Cruz-Muñoz ME, Castro-Martínez G, Arrellín-Rosas G, Zamilpa A, Jimenez-Ferrer JE, Baez Reyes JC, Fragoso G, Salgado GR. Aqueous Fraction from Cucumis sativus Aerial Parts Attenuates Angiotensin II-Induced Endothelial Dysfunction In Vivo by Activating Akt. Nutrients 2023; 15:4680. [PMID: 37960332 PMCID: PMC10649625 DOI: 10.3390/nu15214680] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/12/2023] [Revised: 10/27/2023] [Accepted: 11/02/2023] [Indexed: 11/15/2023] Open
Abstract
BACKGROUND Endothelial dysfunction (ED) is a marker of vascular damage and a precursor of cardiovascular diseases such as hypertension, which involve inflammation and organ damage. Nitric oxide (NO), produced by eNOS, which is induced by pAKT, plays a crucial role in the function of a healthy endothelium. METHODS A combination of subfractions SF1 and SF3 (C4) of the aqueous fraction from Cucumis sativus (Cs-Aq) was evaluated to control endothelial dysfunction in vivo and on HMEC-1 cells to assess the involvement of pAkt in vitro. C57BL/6J mice were injected daily with angiotensin II (Ang-II) for 10 weeks. Once hypertension was established, either Cs-AqC4 or losartan was orally administered along with Ang-II for a further 10 weeks. Blood pressure (BP) was measured at weeks 0, 5, 10, 15, and 20. In addition, serum creatinine, inflammatory status (in the kidney), tissue damage, and vascular remodeling (in the liver and aorta) were evaluated. Cs-AqC4 was also tested in vitro on HMEC-1 cells stimulated by Ang-II to assess the involvement of Akt phosphorylation. RESULTS Cs-AqC4 decreased systolic and diastolic BP, reversed vascular remodeling, decreased IL-1β and TGF-β, increased IL-10, and decreased kidney and liver damage. In HMEC-1 cells, AKT phosphorylation and NO production were increased. CONCLUSIONS Cs-AqC4 controlled inflammation and vascular remodeling, alleviating hypertension; it also improved tissue damage associated with ED, probably via Akt activation.
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Affiliation(s)
- Celeste Trejo-Moreno
- Facultad de Medicina, Universidad Autónoma del Estado de Morelos, Cuernavaca 62350, Morelos, Mexico; (C.T.-M.); (Z.A.A.-O.); (M.E.C.-M.); (G.A.-R.)
| | - Zimri Aziel Alvarado-Ojeda
- Facultad de Medicina, Universidad Autónoma del Estado de Morelos, Cuernavaca 62350, Morelos, Mexico; (C.T.-M.); (Z.A.A.-O.); (M.E.C.-M.); (G.A.-R.)
| | - Marisol Méndez-Martínez
- Departamento de Sistemas Biológicos, División de Ciencias Biológicas y de la Salud, Universidad Autónoma Metropolitana-Xochimilco, Ciudad de México 04960, Mexico;
| | - Mario Ernesto Cruz-Muñoz
- Facultad de Medicina, Universidad Autónoma del Estado de Morelos, Cuernavaca 62350, Morelos, Mexico; (C.T.-M.); (Z.A.A.-O.); (M.E.C.-M.); (G.A.-R.)
| | - Gabriela Castro-Martínez
- Doctorado en Ciencias Biológicas y de la Salud, Universidad Autónoma Metropolitana, Ciudad de México 04960, Mexico;
| | - Gerardo Arrellín-Rosas
- Facultad de Medicina, Universidad Autónoma del Estado de Morelos, Cuernavaca 62350, Morelos, Mexico; (C.T.-M.); (Z.A.A.-O.); (M.E.C.-M.); (G.A.-R.)
- Facultad de Ciencias de la Salud, Universidad Panamericana, Ciudad de México 03920, Mexico
| | - Alejandro Zamilpa
- Centro de Investigación Biomédica del Sur, Instituto Mexicano del Seguro Social, Xochitepec 62790, Morelos, Mexico; (A.Z.); (J.E.J.-F.)
| | - Jesús Enrique Jimenez-Ferrer
- Centro de Investigación Biomédica del Sur, Instituto Mexicano del Seguro Social, Xochitepec 62790, Morelos, Mexico; (A.Z.); (J.E.J.-F.)
| | - Juan Carlos Baez Reyes
- Escuela Nacional Preparatoria No. 1, Universidad Nacional Autónoma de México, Ciudad de México 16030, Mexico;
| | - Gladis Fragoso
- Instituto de Investigaciones Biomédicas, Universidad Nacional Autónoma de México, Ciudad de México 04510, Mexico
| | - Gabriela Rosas Salgado
- Facultad de Medicina, Universidad Autónoma del Estado de Morelos, Cuernavaca 62350, Morelos, Mexico; (C.T.-M.); (Z.A.A.-O.); (M.E.C.-M.); (G.A.-R.)
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5
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Johnson AA, Cuellar TL. Glycine and aging: Evidence and mechanisms. Ageing Res Rev 2023; 87:101922. [PMID: 37004845 DOI: 10.1016/j.arr.2023.101922] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/01/2023] [Accepted: 03/30/2023] [Indexed: 04/03/2023]
Abstract
The restriction of calories, branched-chain amino acids, and methionine have all been shown to extend lifespan in model organisms. Recently, glycine was shown to significantly boost longevity in genetically heterogenous mice. This simple amino acid similarly extends lifespan in rats and improves health in mammalian models of age-related disease. While compelling data indicate that glycine is a pro-longevity molecule, divergent mechanisms may underlie its effects on aging. Glycine is abundant in collagen, a building block for glutathione, a precursor to creatine, and an acceptor for the enzyme Glycine N-methyltransferase (GNMT). A review of the literature strongly implicates GNMT, which clears methionine from the body by taking a methyl group from S-adenosyl-L-methionine and methylating glycine to form sarcosine. In flies, Gnmt is required for reduced insulin/insulin-like growth factor 1 signaling and caloric restriction to fully extend lifespan. The geroprotector spermidine requires Gnmt to upregulate autophagy genes and boost longevity. Moreover, the overexpression of Gnmt is sufficient to extend lifespan and reduce methionine levels. Sarcosine, or methylglycine, declines with age in multiple species and is capable of inducing autophagy both in vitro and in vivo. Taken all together, existing evidence suggests that glycine prolongs life by mimicking methionine restriction and activating autophagy.
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Lázaro-Suárez ML, Domínguez de la Mora I, Rodríguez-Aguilar JC, Fortis-Barrera Á, Blancas-Flores G, Gómez-Zamudio JH, Alarcon-Villaseñor EF, Román-Ramos R, Alarcon-Aguilar FJ. Role of Perivascular Adipose Tissue in Aorta Reactivity from Obese and Hyperglycemic CD-1 Mice: New Insights into Perivascular Adipose Tissue. Metab Syndr Relat Disord 2023; 21:101-108. [PMID: 36399542 DOI: 10.1089/met.2022.0050] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022] Open
Abstract
Background: Perivascular adipose tissue (PVAT) plays an essential role in cardiovascular homeostasis. However, during obesity and diabetes, its role in vascular tone regulation is unclear. This study aimed to evaluate the function of the PVAT on aorta reactivity in the lean and cafeteria (CAF) diet-induced obese-hyperglycemic mice model. Methods: Aorta reactivity to phenylephrine, KCl, and acetylcholine was analyzed in lean (n = 6) and obese mice (n = 6). Also, nitric oxide (NO-) and cyclooxygenase participation, in the presence (n = 6) and absence (n = 6) of PVAT, were examined in the aortas. Results: After a CAF diet for 19 weeks, obese mice showed increased body weight, glucose intolerance, and hypercholesterolemia concerning lean mice. Vascular reactivity to phenylephrine was reduced significantly in the aorta of obese mice. In contrast, the contraction produced by KCl (80 mM) was increased in the aorta of obese mice independent of PVAT. Acetylcholine-induced vasorelaxation diminished in the aortas of obese mice in the presence of PVAT. Nonselective inhibition of cyclooxygenases likely shows that PVAT and endothelium release vasorelaxant prostanoids. Conclusions: The results suggest that PVAT modulates aorta reactivity by releasing NO-, decreasing the α1-adrenergic response to phenylephrine, and probably releasing vasorelaxant prostanoids. The data suggest that PVAT regulates the vascular smooth muscle and endothelial function in a CAF diet-induced obese-hyperglycemic mice model.
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Affiliation(s)
- Martha L Lázaro-Suárez
- Laboratorio de Farmacología, Departamento de Ciencias de la Salud, DCBS, Universidad Autónoma Metropolitana-Iztapalapa, Ciudad de México, México
| | - Israel Domínguez de la Mora
- Laboratorio de Farmacología, Departamento de Ciencias de la Salud, DCBS, Universidad Autónoma Metropolitana-Iztapalapa, Ciudad de México, México
| | - Juan Carlos Rodríguez-Aguilar
- Laboratorio de Farmacología, Departamento de Ciencias de la Salud, DCBS, Universidad Autónoma Metropolitana-Iztapalapa, Ciudad de México, México
| | - Ángeles Fortis-Barrera
- Laboratorio de Farmacología, Departamento de Ciencias de la Salud, DCBS, Universidad Autónoma Metropolitana-Iztapalapa, Ciudad de México, México
| | - Gerardo Blancas-Flores
- Laboratorio de Farmacología, Departamento de Ciencias de la Salud, DCBS, Universidad Autónoma Metropolitana-Iztapalapa, Ciudad de México, México
| | - Jaime H Gómez-Zamudio
- Unidad de Investigación Médica en Bioquímica, Hospital de Especialidades, Centro Médico Nacional Siglo XXI, Instituto Mexicano del Seguro Social, Ciudad de Mexico, Mexico
| | | | - Rubén Román-Ramos
- Laboratorio de Farmacología, Departamento de Ciencias de la Salud, DCBS, Universidad Autónoma Metropolitana-Iztapalapa, Ciudad de México, México
| | - Francisco Javier Alarcon-Aguilar
- Laboratorio de Farmacología, Departamento de Ciencias de la Salud, DCBS, Universidad Autónoma Metropolitana-Iztapalapa, Ciudad de México, México
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7
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Rodríguez-Rodríguez P, Ragusky K, Phuthong S, Ruvira S, Ramiro-Cortijo D, Cañas S, Rebollo-Hernanz M, Morales MD, López de Pablo ÁL, Martín-Cabrejas MA, Arribas SM. Vasoactive Properties of a Cocoa Shell Extract: Mechanism of Action and Effect on Endothelial Dysfunction in Aged Rats. Antioxidants (Basel) 2022; 11:antiox11020429. [PMID: 35204310 PMCID: PMC8869230 DOI: 10.3390/antiox11020429] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/14/2021] [Revised: 02/15/2022] [Accepted: 02/19/2022] [Indexed: 02/06/2023] Open
Abstract
Cocoa has cardiovascular beneficial effects related to its content of antioxidant phytochemicals. Cocoa manufacturing produces large amounts of waste, but some by-products may be used as ingredients with health-promoting potential. We aimed to investigate the vasoactive actions of an extract from cocoa shell (CSE), a by-product containing theobromine (TH), caffeine (CAF) and protocatechuic acid (PCA) as major phytochemicals. In carotid and iliac arteries from 5-month and 15-month-old rats, we investigated CSE vasoactive properties, mechanism of action, and the capacity of CSE, TH, CAF and PCA to improve age-induced endothelial dysfunction. Vascular function was evaluated using isometric tension recording and superoxide anion production by dihydroethidium (DHE) staining and confocal microscopy. CSE caused endothelium-dependent vasorelaxation, blocked by L-NAME, but not indomethacin, regardless of sex, age, or vessel type. CSE maximal responses and EC50 were significantly lower compared to acetylcholine (ACh). Arterial preincubation with CSE, TH, CAF or PCA, significantly reduced the number of vascular DHE-positive cells. Compared to adult males, iliac arteries from aged males exhibited reduced ACh concentration-dependent vasodilatation but larger CSE responses. In iliac arteries from aged male and female rats, preincubation with 10−4 M CSE and PCA, but not TH or CAF, improved ACh-relaxations. In conclusion, CSE has vasodilatory properties associated with increased nitric oxide bioavailability, related to its antioxidant phytochemicals, being particularly relevant PCA. Therefore, CSE is a potential food ingredient for diseases related to endothelial dysfunction.
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Affiliation(s)
- Pilar Rodríguez-Rodríguez
- Department of Physiology, Faculty of Medicine, Universidad Autónoma de Madrid, C/Arzobispo Morcillo 2, 28029 Madrid, Spain; (P.R.-R.); (K.R.); (S.R.); (D.R.-C.); (Á.L.L.d.P.)
- Food, Oxidative Stress and Cardiovascular Health (FOSCH) Multidisciplinary Research Team, Universidad Autónoma de Madrid, Ciudad Universitaria de Cantoblanco, 28049 Madrid, Spain; (S.C.); (M.R.-H.); (M.A.M.-C.)
| | - Kendal Ragusky
- Department of Physiology, Faculty of Medicine, Universidad Autónoma de Madrid, C/Arzobispo Morcillo 2, 28029 Madrid, Spain; (P.R.-R.); (K.R.); (S.R.); (D.R.-C.); (Á.L.L.d.P.)
| | - Sophida Phuthong
- Department of Physiology, Faculty of Medicine, Khon Kaen University, Khon Kaen 40002, Thailand;
| | - Santiago Ruvira
- Department of Physiology, Faculty of Medicine, Universidad Autónoma de Madrid, C/Arzobispo Morcillo 2, 28029 Madrid, Spain; (P.R.-R.); (K.R.); (S.R.); (D.R.-C.); (Á.L.L.d.P.)
- Food, Oxidative Stress and Cardiovascular Health (FOSCH) Multidisciplinary Research Team, Universidad Autónoma de Madrid, Ciudad Universitaria de Cantoblanco, 28049 Madrid, Spain; (S.C.); (M.R.-H.); (M.A.M.-C.)
- PhD Programme in Pharmacology and Physiology, Doctoral School, Universidad Autónoma de Madrid, 28049 Madrid, Spain
| | - David Ramiro-Cortijo
- Department of Physiology, Faculty of Medicine, Universidad Autónoma de Madrid, C/Arzobispo Morcillo 2, 28029 Madrid, Spain; (P.R.-R.); (K.R.); (S.R.); (D.R.-C.); (Á.L.L.d.P.)
- Food, Oxidative Stress and Cardiovascular Health (FOSCH) Multidisciplinary Research Team, Universidad Autónoma de Madrid, Ciudad Universitaria de Cantoblanco, 28049 Madrid, Spain; (S.C.); (M.R.-H.); (M.A.M.-C.)
| | - Silvia Cañas
- Food, Oxidative Stress and Cardiovascular Health (FOSCH) Multidisciplinary Research Team, Universidad Autónoma de Madrid, Ciudad Universitaria de Cantoblanco, 28049 Madrid, Spain; (S.C.); (M.R.-H.); (M.A.M.-C.)
- Department of Agricultural Chemistry and Food Science, Faculty of Science, Universidad Autónoma de Madrid, Ciudad Universitaria de Cantoblanco, 28049 Madrid, Spain
- Institute of Food Science Research, CIAL (UAM-CSIC), Universidad Autonoma de Madrid, C/Nicolás Cabrera, 9, 28049 Madrid, Spain
| | - Miguel Rebollo-Hernanz
- Food, Oxidative Stress and Cardiovascular Health (FOSCH) Multidisciplinary Research Team, Universidad Autónoma de Madrid, Ciudad Universitaria de Cantoblanco, 28049 Madrid, Spain; (S.C.); (M.R.-H.); (M.A.M.-C.)
- Department of Agricultural Chemistry and Food Science, Faculty of Science, Universidad Autónoma de Madrid, Ciudad Universitaria de Cantoblanco, 28049 Madrid, Spain
- Institute of Food Science Research, CIAL (UAM-CSIC), Universidad Autonoma de Madrid, C/Nicolás Cabrera, 9, 28049 Madrid, Spain
| | - María Dolores Morales
- Confocal Microscopy Service (SiDI), Faculty of Medicine, Universidad Autonoma de Madrid, C/Arzobispo Morcillo 2, 28029 Madrid, Spain;
| | - Ángel L. López de Pablo
- Department of Physiology, Faculty of Medicine, Universidad Autónoma de Madrid, C/Arzobispo Morcillo 2, 28029 Madrid, Spain; (P.R.-R.); (K.R.); (S.R.); (D.R.-C.); (Á.L.L.d.P.)
- Food, Oxidative Stress and Cardiovascular Health (FOSCH) Multidisciplinary Research Team, Universidad Autónoma de Madrid, Ciudad Universitaria de Cantoblanco, 28049 Madrid, Spain; (S.C.); (M.R.-H.); (M.A.M.-C.)
| | - María A. Martín-Cabrejas
- Food, Oxidative Stress and Cardiovascular Health (FOSCH) Multidisciplinary Research Team, Universidad Autónoma de Madrid, Ciudad Universitaria de Cantoblanco, 28049 Madrid, Spain; (S.C.); (M.R.-H.); (M.A.M.-C.)
- Department of Agricultural Chemistry and Food Science, Faculty of Science, Universidad Autónoma de Madrid, Ciudad Universitaria de Cantoblanco, 28049 Madrid, Spain
- Institute of Food Science Research, CIAL (UAM-CSIC), Universidad Autonoma de Madrid, C/Nicolás Cabrera, 9, 28049 Madrid, Spain
| | - Silvia M. Arribas
- Department of Physiology, Faculty of Medicine, Universidad Autónoma de Madrid, C/Arzobispo Morcillo 2, 28029 Madrid, Spain; (P.R.-R.); (K.R.); (S.R.); (D.R.-C.); (Á.L.L.d.P.)
- Food, Oxidative Stress and Cardiovascular Health (FOSCH) Multidisciplinary Research Team, Universidad Autónoma de Madrid, Ciudad Universitaria de Cantoblanco, 28049 Madrid, Spain; (S.C.); (M.R.-H.); (M.A.M.-C.)
- Correspondence:
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8
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Simmons RM, McKnight SM, Edwards AK, Wu G, Satterfield MC. Obesity increases hepatic glycine dehydrogenase and aminomethyltransferase expression while dietary glycine supplementation reduces white adipose tissue in Zucker diabetic fatty rats. Amino Acids 2020; 52:1413-1423. [PMID: 33057941 DOI: 10.1007/s00726-020-02901-9] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/10/2020] [Accepted: 10/06/2020] [Indexed: 12/31/2022]
Abstract
Obesity is associated with altered glycine metabolism in humans. This study investigated the mechanisms regulating glycine metabolism in obese rats. Eight-week-old Zucker diabetic fatty rats (ZDF; a type-II diabetic animal model) received either 1% glycine or 1.19% L-alanine (isonitrogenous control) in drinking water for 6 weeks. An additional group of lean Zucker rats also received 1.19% L-alanine as a lean control. Glycine concentrations in serum and liver were markedly lower in obese versus lean rats. Enteral glycine supplementation restored both serum and hepatic glycine levels, while reducing mesenteric and internal white fat mass compared with alanine-treated ZDF rats. Blood glucose and non-esterified fatty acid (NEFA) concentrations did not differ between the control and glycine-supplemented ZDF rats (P > 0.10). Both mRNA and protein expression of aminomethyltransferase (AMT) and glycine dehydrogenase, decarboxylating (GLDC) were increased in the livers of obese versus lean rats (P < 0.05). In contrast, glycine cleavage system H (GCSH) hepatic mRNA expression was downregulated in obese versus lean rats, although there was no change in protein expression. These findings indicate that reduced quantities of glycine observed in obese subjects likely results from an upregulation of the hepatic glycine cleavage system and that dietary glycine supplementation potentially reduces obesity in ZDF rats.
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Affiliation(s)
- Rebecca M Simmons
- Department of Animal Science, Texas A&M University, College Station, TX, 77843, USA
| | - Sorin M McKnight
- Department of Animal Science, Texas A&M University, College Station, TX, 77843, USA
| | - Ashley K Edwards
- Department of Animal Science, Texas A&M University, College Station, TX, 77843, USA
| | - Guoyao Wu
- Department of Animal Science, Texas A&M University, College Station, TX, 77843, USA
| | - Michael C Satterfield
- Department of Animal Science, Texas A&M University, College Station, TX, 77843, USA.
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9
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Zakaria ER, Joseph B, Hamidi M, Zeeshan M, Algamal A, Sartaj F, Althani M, Fadl T, Madan D. Glycine improves peritoneal vasoreactivity to dialysis solutions in the elderly. Qatar Med J 2019; 2019:19. [PMID: 31903325 PMCID: PMC6929513 DOI: 10.5339/qmj.2019.19] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/03/2019] [Accepted: 07/03/2019] [Indexed: 11/23/2022] Open
Abstract
Background: Peritoneal dialysis solution (PDS) dilates peritoneal microvessels predominantly by the activation of the endothelial nitric oxide (NO) pathway. We made an incidental observation of decreased PDS-induced, NO-dependent peritoneal microvascular vasoreactivity in elderly rats naïve to PDS exposure. We hypothesized that this subordinate NO-mediated peritoneal microvascular vasoreactivity is caused by increased oxidative stress in the aged endothelium, which compromises NO bioavailability in the elderly, and that peritoneal microvascular vasoreactivity can be improved by the supplementation of antioxidant glycine to PDS. Methods: We studied PDS-mediated vasoreactivity of four intestinal visceral arterioles of different orders by in vivo intravital microscopy in weaned, adult, and elderly rats to (i) confirm subordinate vasoreactivity to PDS in elderly rats; (ii) restore vasoreactivity by glycine supplementation; and (iii) establish age as an independent risk factor for endothelial cell dysfunction. Results: In a crossover series, peritoneal microvascular vasoreactivity to PDS exposure was remarkably decreased in elderly rats. This subordinate vasoreactivity was completely restored by the supplementation of glycine to PDS. In a separate series, we assessed in situ endothelial cell function in weaned and adult rats using the cumulative acetylcholine concentration–response curves. Unlike the adults, the weaned rats demonstrated remarkable sensitivity and reactivity to cumulative acetylcholine concentrations, suggesting the dependency of endothelial cell function on age. Conclusion: Aging is an independent risk factor for peritoneal microvascular endothelial cell dysfunction. Endothelial function in the elderly can be recovered by reinforcing the bioavailability of endothelial-derived NO through glycine. Dietary glycine supplementation is a potential therapeutic strategy to decrease the burden of oxidative stress on the aged endothelium.
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Affiliation(s)
- El Rasheid Zakaria
- The University of Arizona, Division of Trauma, Critical Care, Burns & Emergency Surgery, Tucson, AZ 85721, USA
| | - Bellal Joseph
- The University of Arizona, Division of Trauma, Critical Care, Burns & Emergency Surgery, Tucson, AZ 85721, USA
| | - Mohammad Hamidi
- The University of Arizona, Division of Trauma, Critical Care, Burns & Emergency Surgery, Tucson, AZ 85721, USA
| | - Muhammad Zeeshan
- The University of Arizona, Division of Trauma, Critical Care, Burns & Emergency Surgery, Tucson, AZ 85721, USA
| | - Abdelrahman Algamal
- Qatar University, Biomedical Research Center & College of Arts and Health Sciences, P.O. Box 2713, Doha, Qatar
| | - Faheem Sartaj
- Qatar University, Biomedical Research Center & College of Arts and Health Sciences, P.O. Box 2713, Doha, Qatar
| | - Maha Althani
- Qatar University, Biomedical Research Center & College of Arts and Health Sciences, P.O. Box 2713, Doha, Qatar
| | - Tassnim Fadl
- Qatar University, Biomedical Research Center & College of Arts and Health Sciences, P.O. Box 2713, Doha, Qatar
| | - Dana Madan
- Qatar University, Biomedical Research Center & College of Arts and Health Sciences, P.O. Box 2713, Doha, Qatar
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10
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Glycine Suppresses AGE/RAGE Signaling Pathway and Subsequent Oxidative Stress by Restoring Glo1 Function in the Aorta of Diabetic Rats and in HUVECs. OXIDATIVE MEDICINE AND CELLULAR LONGEVITY 2019; 2019:4628962. [PMID: 30944692 PMCID: PMC6421782 DOI: 10.1155/2019/4628962] [Citation(s) in RCA: 28] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/25/2018] [Accepted: 01/13/2019] [Indexed: 12/20/2022]
Abstract
Oxidative stress plays a crucial role in the pathogenesis of diabetic vascular complications. It is known that the accumulation of advanced glycation end products (AGEs) and the activation of the receptor of AGEs (RAGE) induce sustained oxidative stress in the vascular tissue. Growing evidence indicates that glycine, the simplest amino acid, exerts antioxidant and antiglycation effects and also improves vascular function. However, the mechanism whereby glycine protects vascular tissue against oxidative stress in models with diabetes has not been investigated. In the present study, we evaluated whether glycine can attenuate oxidative stress by suppressing the AGE/RAGE signaling pathway in the aorta of streptozotocin-induced diabetic rats and in human umbilical vascular endothelial cells (HUVECs). Our results showed that oral glycine administration increased NO content and ameliorated oxidative stress in the serum and aorta of diabetic rats. The AGE/RAGE signaling pathway in the aorta of diabetic rats was significantly attenuated by glycine treatment as manifested by decreases in levels of AGEs, RAGE, Nox4, and NF-κB p65. The suppressive effect of glycine on the formation of AGEs was associated with increased activity and expression of aortic glyoxalase-1 (Glo1), a crucial enzyme that degrades methylglyoxal (MG), the major precursor of AGEs. In MG-treated HUVECs, glycine restored the function of Glo1, suppressed the AGE/RAGE signaling pathway, and inhibited the generation of reactive oxygen species. In addition, the reduction in the formation of AGEs in HUVECs caused by glycine treatment was inhibited by Glo1 inhibition. Taken together, our study provides evidence that glycine might inhibit the AGE/RAGE pathway and subsequent oxidative stress by improving Glo1 function, thus protecting against diabetic macrovascular complications.
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Qin C, Zhang L, Wang X, Duan Y, Ye Z, Xie M. Evaluation of Carotid Plaque Neovascularization in Patients With Coronary Heart Disease on Contrast-Enhanced Ultrasonography. JOURNAL OF ULTRASOUND IN MEDICINE : OFFICIAL JOURNAL OF THE AMERICAN INSTITUTE OF ULTRASOUND IN MEDICINE 2018; 37:823-831. [PMID: 29027678 DOI: 10.1002/jum.14410] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/24/2017] [Revised: 06/05/2017] [Accepted: 06/16/2017] [Indexed: 06/07/2023]
Abstract
OBJECTIVES To examine the repeatability of quantitative time-intensity curve analysis of neovascularization within carotid plaques with contrast-enhanced ultrasonography (US) and to investigate carotid plaque neovascularization in patients with coronary heart disease using contrast-enhanced US and the correlation between risk factors and acute coronary syndrome (ACS). METHODS Sixty patients with ACS and 60 with stable coronary artery disease (CAD) underwent conventional carotid and contrast-enhanced US, and plaque enhancement was observed and analyzed quantitatively. Carotid contrast-enhanced US was performed within 1 month of ACS occurrence. Interobserver and intraobserver variability of the measurements was assessed. The peak signal intensity was the maximum number of contrast microbubbles that local tissues could accumulate, reflecting the local microvascular density and representing the capillary volume. RESULTS The ACS group had higher low-density lipoprotein cholesterol (mean ± SD, 3.21 ± 0.75 versus 2.53 ± 0.71 mmol/L; P < .01) and high-sensitivity C-reactive protein (CRP; 3.76 ± 0.19 versus 2. 93 ± 0.15 mg/L; P < .01) levels than the stable CAD group. The proportion of soft plaques in the ACS group (81%) was higher than in the stable CAD group (53%). The proportion of plaque enhancement, peak signal intensity, and plaque-to-carotid lumen enhancement intensity ratio were higher in the ACS group than the stable CAD group. The peak signal intensity was correlated with the high-sensitivity CRP value. Logistic regression analyses indicated that age (65-74 years), high-sensitivity CRP, and enhancement intensity were correlated with the occurrence of ACS. The sensitivity and specificity of the peak signal intensity in carotid plaques were 80.0% and 88.3%, respectively (cutoff value, 9.97 dB; area under the receiver operating characteristic curve, 0.865). The time-intensity curve measurements had good repeatability. CONCLUSIONS Carotid plaque enhancement is a potential independent risk factor for ACS occurrence. These results illustrate the correlation of carotid plaque vulnerability with the coronary artery symptomatic state according to the common pathogenetic mechanism of atherosclerosis.
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Affiliation(s)
- Chuan Qin
- Department of Ultrasound, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
- Hubei Province Key Laboratory of Molecular Imaging, Wuhan, China
- Department of Ultrasound, Central Hospital, Karamay, China
| | - Li Zhang
- Department of Ultrasound, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
- Hubei Province Key Laboratory of Molecular Imaging, Wuhan, China
| | - Xinfang Wang
- Department of Ultrasound, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
- Hubei Province Key Laboratory of Molecular Imaging, Wuhan, China
| | - Yilian Duan
- Department of Ultrasound, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
- Hubei Province Key Laboratory of Molecular Imaging, Wuhan, China
| | - Zhou Ye
- Department of Ultrasound, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
- Department of Ultrasound, Central Hospital, Karamay, China
| | - Mingxing Xie
- Department of Ultrasound, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
- Hubei Province Key Laboratory of Molecular Imaging, Wuhan, China
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Trejo-Moreno C, Méndez-Martínez M, Zamilpa A, Jiménez-Ferrer E, Perez-Garcia MD, Medina-Campos ON, Pedraza-Chaverri J, Santana MA, Esquivel-Guadarrama FR, Castillo A, Cervantes-Torres J, Fragoso G, Rosas-Salgado G. Cucumis sativus Aqueous Fraction Inhibits Angiotensin II-Induced Inflammation and Oxidative Stress In Vitro. Nutrients 2018; 10:nu10030276. [PMID: 29495578 PMCID: PMC5872694 DOI: 10.3390/nu10030276] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/02/2018] [Revised: 02/15/2018] [Accepted: 02/25/2018] [Indexed: 01/05/2023] Open
Abstract
Inflammation and oxidative stress play major roles in endothelial dysfunction, and are key factors in the progression of cardiovascular diseases. The aim of this study was to evaluate in vitro the effect of three subfractions (SFs) from the Cucumis sativus aqueous fraction to reduce inflammatory factors and oxidative stress induced by angiotensin II (Ang II) in human microvascular endothelial cells-1 (HMEC-1) cells. The cells were cultured with different concentrations of Ang II and 0.08 or 10 μg/mL of SF1, SF2, or SF3, or 10 μmol of losartan as a control. IL-6 (Interleukin 6) concentration was quantified. To identify the most effective SF combinations, HMEC-1 cells were cultured as described above in the presence of four combinations of SF1 and SF3. Then, the effects of the most effective combination on the expression of adhesion molecules, the production of reactive oxygen species (ROS), and the bioavailability of nitric oxide (NO) were evaluated. Finally, a mass spectrometry analysis was performed. Both SF1 and SF3 subfractions decreased the induction of IL-6 by Ang II, and C4 (SF1 and SF3, 10 μg/mL each) was the most effective combination to inhibit the production of IL-6. Additionally, C4 prevented the expression of adhesion molecules, reduced the production of ROS, and increased the bioavailability of NO. Glycine, arginine, asparagine, lysine, and aspartic acid were the main components of both subfractions. These results demonstrate that C4 has anti-inflammatory and antioxidant effects.
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Affiliation(s)
- Celeste Trejo-Moreno
- Instituto de Investigación en Ciencias Básicas y Aplicadas, Universidad Autónoma del Estado de Morelos, Av. Universidad 1001, Cuernavaca, Morelos CP 62209, Mexico.
- Facultad de Medicina, Universidad Autónoma del Estado de Morelos, Leñeros S/N, Cuernavaca, Morelos CP 62350, Mexico.
| | - Marisol Méndez-Martínez
- Instituto de Investigación en Ciencias Básicas y Aplicadas, Universidad Autónoma del Estado de Morelos, Av. Universidad 1001, Cuernavaca, Morelos CP 62209, Mexico.
- Facultad de Medicina, Universidad Autónoma del Estado de Morelos, Leñeros S/N, Cuernavaca, Morelos CP 62350, Mexico.
| | - Alejandro Zamilpa
- Laboratorio de Farmacología, Centro de Investigación Biomédica del Sur, Instituto Mexicano del Seguro Social, Republica de Argentina 1, Xochitepec, Morelos CP 62790, Mexico.
| | - Enrique Jiménez-Ferrer
- Laboratorio de Farmacología, Centro de Investigación Biomédica del Sur, Instituto Mexicano del Seguro Social, Republica de Argentina 1, Xochitepec, Morelos CP 62790, Mexico.
| | - Maria Dolores Perez-Garcia
- Laboratorio de Farmacología, Centro de Investigación Biomédica del Sur, Instituto Mexicano del Seguro Social, Republica de Argentina 1, Xochitepec, Morelos CP 62790, Mexico.
| | - Omar N Medina-Campos
- Departamento de Biología, Facultad de Química, Universidad Nacional Autónoma de México, Coyoacán, Mexico City CP 04510, Mexico.
| | - José Pedraza-Chaverri
- Departamento de Biología, Facultad de Química, Universidad Nacional Autónoma de México, Coyoacán, Mexico City CP 04510, Mexico.
| | - María Angélica Santana
- Centro de Investigación en Dinámica Celular (IICBA), Universidad Autónoma del Estado de Morelos, Av. Universidad 1001, Cuernavaca, Morelos CP 62209, Mexico.
| | | | - Aida Castillo
- Departamento de Fisiología Biofísica y Neurociencias del Centro de Investigación y Estudios Avanzados del Instituto Politécnico Nacional (CINVESTAV del IPN), Mexico City CP 07360, Mexico.
| | - Jacquelynne Cervantes-Torres
- Departamento de Inmunología, Instituto de Investigaciones Biomédicas, Universidad Nacional Autónoma de México, Coyoacán, Mexico City CP 04510, Mexico.
| | - Gladis Fragoso
- Departamento de Inmunología, Instituto de Investigaciones Biomédicas, Universidad Nacional Autónoma de México, Coyoacán, Mexico City CP 04510, Mexico.
| | - Gabriela Rosas-Salgado
- Facultad de Medicina, Universidad Autónoma del Estado de Morelos, Leñeros S/N, Cuernavaca, Morelos CP 62350, Mexico.
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13
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McCarty MF, O'Keefe JH, DiNicolantonio JJ. Dietary Glycine Is Rate-Limiting for Glutathione Synthesis and May Have Broad Potential for Health Protection. Ochsner J 2018; 18:81-87. [PMID: 29559876 PMCID: PMC5855430] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/08/2023] Open
Abstract
BACKGROUND Glutathione is a key scavenging antioxidant that opposes the proinflammatory signaling of hydrogen peroxide. Boosting cellular glutathione levels may have broad utility in the prevention and treatment of disorders driven by oxidative stress. Supplemental N-acetylcysteine has been employed for this purpose. Could supplemental glycine likewise promote glutathione synthesis? METHODS We conducted a review of the pertinent literature using PubMed. RESULTS Tissue glycine levels are lower than the glutathione synthase Michaelis constant (Km) for glycine. When glycine availability is too low to sustain a normal rate of glutathione synthesis, the consequent rise in tissue levels of gamma-glutamylcysteine leads to an increase in urinary excretion of its alternative metabolite 5-L-oxoproline. The fact that urinary excretion of this metabolite is elevated in vegetarians and others consuming relatively low-protein diets strongly suggests that dietary glycine can be rate-limiting for glutathione synthesis in normally fed humans. Moreover, supplemental glycine has been reported to increase tissue glutathione levels in several animal studies. Glycine is a biosynthetic precursor for porphyrins, purines, creatine, sarcosine, and bile salts; is an agonist for glycine-gated chloride channels and a coagonist for N-methyl-D-aspartate receptors; inhibits protein glycation; and increases hepatic production of pyruvate, an effective scavenger of hydrogen peroxide. Supplemental glycine may have the potential for improving endothelial function, preventing cardiac hypertrophy, aiding control of metabolic syndrome, preventing the complications of diabetes, dampening inflammation, protecting the liver, and promoting effective sleep. CONCLUSION Clinical research is warranted to evaluate the impact of supplemental glycine on glutathione levels and on various health disorders.
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Affiliation(s)
| | - James H. O'Keefe
- Department of Cardiology, Mid America Heart Institute, Saint Luke's Health System, Kansas City, MO
| | - James J. DiNicolantonio
- Department of Cardiology, Mid America Heart Institute, Saint Luke's Health System, Kansas City, MO
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Wang L, Liu S, Yang W, Yu H, Zhang L, Ma P, Wu P, Li X, Cho K, Xue S, Jiang B. Plasma Amino Acid Profile in Patients with Aortic Dissection. Sci Rep 2017; 7:40146. [PMID: 28071727 PMCID: PMC5223271 DOI: 10.1038/srep40146] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/16/2016] [Accepted: 11/28/2016] [Indexed: 12/13/2022] Open
Abstract
Aortic dissection (AD), a severe cardiovascular disease with the characteristics of high mortality, is lack of specific clinical biomarkers. In order to facilitate the diagnosis of AD, we investigated plasma amino acid profile through metabolomics approach. Total 33 human subjects were enrolled in the study: 11 coronary heart disease (CHD) patients without aortic lesion and 11 acute AD and 11 chronic AD. Amino acids were identified in plasma using liquid chromatography and mass spectrometry (LC-MS/MS), and were further subjected to multiple logistic regression analysis. The score plots of principal component analysis (PCA) and partial least squares-discriminate analysis (PLS-DA) showed clear discrimination of CHD patients with AD, acute AD or chronic AD patients, respectively. The contents of histidine, glycine, serine, citrate, ornithine, hydroxyproline, proline and sarcosine were significant different in acute AD patients comparing with CHD patients. The levels of citrate, GABA, glutamate and cysteine were significant different in chronic AD patients comparing with CHD patients. The contents of glutamate and phenylalanine were significant changed in acute AD patients comparing with chronic AD patients. Plasma aminograms were significantly altered in patients with AD comparing with CHD, especially in acute AD, suggesting amino acid profile is expected to exploit a novel, non-invasive, objective diagnosis for AD.
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Affiliation(s)
- Linlin Wang
- Shanghai Institute of Materia Medica, Chinese Academy of Sciences, Shanghai 201203, China
| | - Sha Liu
- Department of Cardiovascular Surgery, Renji Hospital, Shanghai Jiaotong University School of Medicine, Shanghai 200127, China.,Covidien (Shanghai) Management Consulting Co., Ltd, Shanghai 200233, China
| | - Wengang Yang
- Department of Cardiovascular Surgery, Renji Hospital, Shanghai Jiaotong University School of Medicine, Shanghai 200127, China
| | - Haitao Yu
- Shanghai Institute of Materia Medica, Chinese Academy of Sciences, Shanghai 201203, China
| | - Li Zhang
- Shanghai Institute of Materia Medica, Chinese Academy of Sciences, Shanghai 201203, China
| | - Ping Ma
- The Second Artillery General Hospital PLA, Beijing 100088, China
| | - Peng Wu
- Shanghai Institute of Materia Medica, Chinese Academy of Sciences, Shanghai 201203, China
| | - Xue Li
- Shanghai Institute of Materia Medica, Chinese Academy of Sciences, Shanghai 201203, China
| | - Kenka Cho
- Takarazuka University of Medical and Health Care, Hanayashiki-Midorigaoka, Takarazuka-city 6660162, Japan
| | - Song Xue
- Department of Cardiovascular Surgery, Renji Hospital, Shanghai Jiaotong University School of Medicine, Shanghai 200127, China
| | - Baohong Jiang
- Shanghai Institute of Materia Medica, Chinese Academy of Sciences, Shanghai 201203, China
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