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Regazzoni L, Fumagalli L, Artasensi A, Gervasoni S, Gilardoni E, Mazzolari A, Aldini G, Vistoli G. Cyclo(His-Pro) Exerts Protective Carbonyl Quenching Effects through Its Open Histidine Containing Dipeptides. Nutrients 2022; 14:1775. [PMID: 35565743 PMCID: PMC9103439 DOI: 10.3390/nu14091775] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/11/2022] [Revised: 04/11/2022] [Accepted: 04/19/2022] [Indexed: 12/12/2022] Open
Abstract
Cyclo(His-Pro) (CHP) is a cyclic dipeptide which is endowed with favorable pharmacokinetic properties combined with a variety of biological activities. CHP is found in a number of protein-rich foods and dietary supplements. While being stable at physiological pH, CHP can open yielding two symmetric dipeptides (His-Pro, Pro-His), the formation of which might be particularly relevant from dietary CHP due to the gastric acidic environment. The antioxidant and protective CHP properties were repeatedly reported although the non-enzymatic mechanisms were scantly investigated. The CHP detoxifying activity towards α,β unsaturated carbonyls was never investigated in detail, although its open dipeptides might be effective as already observed for histidine containing dipeptides. Hence, this study investigated the scavenging properties of TRH, CHP and its open derivatives towards 4-hydroxy-2-nonenal. The obtained results revealed that Pro-His possesses a marked activity and is more reactive than l-carnosine. As investigated by DFT calculations, the enhanced reactivity can be ascribed to the greater electrophilicity of the involved iminium intermediate. These findings emphasize that the primary amine (as seen in l-carnosine) can be replaced by secondary amines with beneficial effects on the quenching mechanisms. Serum stability of the tested peptides was also evaluated, showing that Pro-His is characterized by a greater stability than l-carnosine. Docking simulations suggested that its hydrolysis can be catalyzed by serum carnosinase. Altogether, the reported results evidence that the antioxidant CHP properties can be also due to the detoxifying activity of its open dipeptides, which might be thus responsible for the beneficial effects induced by CHP containing food.
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Affiliation(s)
- Luca Regazzoni
- Dipartimento di Scienze Farmaceutiche, Università degli Studi di Milano, I-20133 Milano, Italy; (L.R.); (L.F.); (A.A.); (S.G.); (E.G.); (A.M.); (G.A.)
| | - Laura Fumagalli
- Dipartimento di Scienze Farmaceutiche, Università degli Studi di Milano, I-20133 Milano, Italy; (L.R.); (L.F.); (A.A.); (S.G.); (E.G.); (A.M.); (G.A.)
| | - Angelica Artasensi
- Dipartimento di Scienze Farmaceutiche, Università degli Studi di Milano, I-20133 Milano, Italy; (L.R.); (L.F.); (A.A.); (S.G.); (E.G.); (A.M.); (G.A.)
| | - Silvia Gervasoni
- Dipartimento di Scienze Farmaceutiche, Università degli Studi di Milano, I-20133 Milano, Italy; (L.R.); (L.F.); (A.A.); (S.G.); (E.G.); (A.M.); (G.A.)
- Department of Physics, Università di Cagliari, Citt. Universitaria, I-09042 Monserrato, Italy
| | - Ettore Gilardoni
- Dipartimento di Scienze Farmaceutiche, Università degli Studi di Milano, I-20133 Milano, Italy; (L.R.); (L.F.); (A.A.); (S.G.); (E.G.); (A.M.); (G.A.)
| | - Angelica Mazzolari
- Dipartimento di Scienze Farmaceutiche, Università degli Studi di Milano, I-20133 Milano, Italy; (L.R.); (L.F.); (A.A.); (S.G.); (E.G.); (A.M.); (G.A.)
| | - Giancarlo Aldini
- Dipartimento di Scienze Farmaceutiche, Università degli Studi di Milano, I-20133 Milano, Italy; (L.R.); (L.F.); (A.A.); (S.G.); (E.G.); (A.M.); (G.A.)
| | - Giulio Vistoli
- Dipartimento di Scienze Farmaceutiche, Università degli Studi di Milano, I-20133 Milano, Italy; (L.R.); (L.F.); (A.A.); (S.G.); (E.G.); (A.M.); (G.A.)
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Dai H, Fu Q, Chen H, Zhang M, Sun M, Gu Y, Zhou N, Yang T. A novel numerical model of combination levels of C-peptide and insulin in coronary artery disease risk prediction. MATHEMATICAL BIOSCIENCES AND ENGINEERING : MBE 2021; 18:2675-2687. [PMID: 33892566 DOI: 10.3934/mbe.2021136] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
OBJECTIVE Insulin resistance is a major risk factor for coronary artery disease (CAD). The C-peptide-to-insulin ratio (C/I) is associated with hepatic insulin clearance and insulin resistance. The current study was designed to establish a novel C/I index (CPIRI) model and provide early risk assessment of CAD. METHODS A total of 865 adults diagnosed with new-onset diabetes mellitus (DM) within one year and 54 healthy controls (HC) were recruited to develop a CPIRI model. The CPIRI model was established with fasting C/I as the independent variable and homeostasis model assessment of insulin resistance (HOMA-IR) as the dependent variable. Associations between the CPIRI model and the severity of CAD events were also assessed in 45 hyperglycemic patients with CAD documented via coronary arteriography (CAG) and whom underwent stress echocardiography (SE) and exercise electrocardiography test (EET). RESULTS Fasting C-peptide/insulin and HOMA-IR were hyperbolically correlated in DM patients and HC, and log(C/I) and log(HOMA-IR) were linearly and negatively correlated. The respective correlational coefficients were -0.83 (p < 0.001) and -0.76 (p < 0.001). The equations CPIRI(DM) = 670/(C/I)2.24 + 0.25 and CPIRI(HC) = 670/(C/I)2.24 - 1 (F = 1904.39, p < 0.001) were obtained. Patients with insulin resistance exhibited severe coronary artery impairment and myocardial ischemia. In CAD patients there was no significant correlation between insulin resistance and the number of vessels involved. CONCLUSIONS CPIRI can be used to effectively evaluate insulin resistance, and the combination of CPIRI and non-invasive cardiovascular examination is of great clinical value in the assessment of CAD.
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Affiliation(s)
- Hao Dai
- Department of Endocrinology and Metabolism, the First Affiliated Hospital with Nanjing Medical University, 300 Guangzhou Road, Nanjing 210029, China
| | - Qi Fu
- Department of Endocrinology and Metabolism, the First Affiliated Hospital with Nanjing Medical University, 300 Guangzhou Road, Nanjing 210029, China
| | - Heng Chen
- Department of Endocrinology and Metabolism, the First Affiliated Hospital with Nanjing Medical University, 300 Guangzhou Road, Nanjing 210029, China
| | - Mei Zhang
- Department of Endocrinology and Metabolism, the First Affiliated Hospital with Nanjing Medical University, 300 Guangzhou Road, Nanjing 210029, China
| | - Min Sun
- Department of Endocrinology and Metabolism, the First Affiliated Hospital with Nanjing Medical University, 300 Guangzhou Road, Nanjing 210029, China
| | - Yong Gu
- Department of Endocrinology and Metabolism, the First Affiliated Hospital with Nanjing Medical University, 300 Guangzhou Road, Nanjing 210029, China
| | - Ningtian Zhou
- Department of Cardiology, the First Affiliated Hospital with Nanjing Medical University, 300 Guangzhou Road, Nanjing 210029, China
| | - Tao Yang
- Department of Endocrinology and Metabolism, the First Affiliated Hospital with Nanjing Medical University, 300 Guangzhou Road, Nanjing 210029, China
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Salis ER, Reith DM, Wheeler BJ, Broadbent RS, Medlicott NJ. Insulin resistance, glucagon-like peptide-1 and factors influencing glucose homeostasis in neonates. Arch Dis Child Fetal Neonatal Ed 2017; 102:F162-F166. [PMID: 27589992 DOI: 10.1136/archdischild-2015-309174] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/14/2015] [Revised: 07/01/2016] [Accepted: 08/11/2016] [Indexed: 11/04/2022]
Abstract
OBJECTIVES To explore the relationships between postmenstrual age (PMA), insulin, C-peptide, glucagon and blood glucose concentrations (BGCs) in preterm and term neonates. To compare glucagon-like peptide-1 (GLP-1) concentrations in fed versus never-fed neonates. DESIGN Observational. SETTING Dunedin Hospital Neonatal Intensive Care Unit, New Zealand. PATIENTS Term or preterm euglycaemic neonates (102) receiving routine blood tests (343 samples). INTERVENTIONS None: plasma was obtained from surplus samples from routine clinical care. MAIN OUTCOME MEASURES Insulin, C-peptide, GLP-1 and glucagon concentrations were measured in temporal association with BGC. RESULTS Insulin and C-peptide concentrations were elevated in very preterm infants (PMA≤32 weeks) and decreased to term; this relationship persisted when BGCs were accounted for. Generalised linear mixed models showed that insulin:C-peptide ratio and insulin:BGC ratio decreased significantly with increasing PMA (p<0.001). GLP-1 increased following initial oral feeds regardless of PMA (p<0.001). CONCLUSION Preterm neonates exhibit insulin resistance in the absence of hyperglycaemia. Enteral feeds result in an increase in GLP-1. These factors are likely to contribute to the increased risk of hyperglycaemia in premature neonates (PMA<32 weeks).
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Affiliation(s)
- Emma R Salis
- New Zealand's National School of Pharmacy, University of Otago, Dunedin, New Zealand
| | - David M Reith
- Department of Women's and Children's Health, Dunedin School of Medicine, University of Otago, Dunedin, New Zealand
| | - Benjamin J Wheeler
- Department of Women's and Children's Health, Dunedin School of Medicine, University of Otago, Dunedin, New Zealand
| | - Roland S Broadbent
- Department of Women's and Children's Health, Dunedin School of Medicine, University of Otago, Dunedin, New Zealand
| | - Natalie J Medlicott
- New Zealand's National School of Pharmacy, University of Otago, Dunedin, New Zealand
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Salis ER, Reith DM, Wheeler BJ, Broadbent RS, Medlicott NJ. Hyperglycaemic preterm neonates exhibit insulin resistance and low insulin production. BMJ Paediatr Open 2017; 1:e000160. [PMID: 29637163 PMCID: PMC5862205 DOI: 10.1136/bmjpo-2017-000160] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/17/2017] [Revised: 07/25/2017] [Accepted: 07/26/2017] [Indexed: 12/04/2022] Open
Abstract
OBJECTIVES To explore and compare the relationships between postmenstrual age (PMA), insulin, C-peptide and blood glucose concentrations (BGC) in hyperglycaemic and euglycaemic preterm neonates (PMA <30 weeks). DESIGN Observational. SETTING Dunedin Hospital Neonatal Intensive Care Unit, New Zealand. PATIENTS Preterm neonates were recruited and included nine insulin-treated hyperglycaemic and 20 euglycaemic neonates. Samples for euglycaemic neonates were obtained from leftover blood, and for insulin-treated neonates, additional blood was collected at the same time as the patients' routine 4 hourly blood glucose test over a 24-hour period (six samples). MAIN OUTCOME MEASURES Blood samples were collected, plasma was analysed for insulin and C-peptide and was measured in temporal association with BGC. RESULTS The euglycaemic neonates had a mean PMA (SD) of 28 (1.4) weeks and the insulin-treated neonates had 25.5 (1.8) weeks. C-peptide plasma concentrations were significantly lower (p<0.01) in the insulin-treated hyperglycaemic neonates (51.7 (100) pmol/L; 200(208) pmol/L) indicating lower insulin production. Insulin plasma concentrations (r=-0.38), BGC (r=-0.38), C-peptide plasma concentrations (r=0.36) and insulin/C-peptide ratios (r=-0.49) were all significantly affected by PMA (p<0.01). As expected, insulin plasma concentrations were higher in the insulin-treated hyperglycaemic neonates (156 (161) pmol/L; 93.2 (63.1) pmol/L, p<0.01) confirming that intravenous exogenous insulin reached these neonates. CONCLUSIONS This study demonstrates that preterm neonates exhibit insulin resistance, hyperglycaemic neonates have lower insulin production than euglycaemic neonates and treatment with exogenous insulin did not appear to suppress insulin production in these neonates.
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Affiliation(s)
- Emma R Salis
- New Zealand's National School of Pharmacy, University of Otago, Dunedin, New Zealand
| | - David M Reith
- Department of Women's and Child Health, Dunedin School of Medicine, University of Otago, Dunedin, New Zealand
| | - Benjamin J Wheeler
- Department of Women's and Child Health, Dunedin School of Medicine, University of Otago, Dunedin, New Zealand
| | - Roland S Broadbent
- Department of Women's and Child Health, Dunedin School of Medicine, University of Otago, Dunedin, New Zealand
| | - Natalie J Medlicott
- New Zealand's National School of Pharmacy, University of Otago, Dunedin, New Zealand
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Salis ER, Soelbeck MK, Reith DM, Wheeler BJ, Broadbent RS, Medlicott NJ. Effect of gestational age and blood glucose on C-peptide excretion rate and clearance in neonates. J Paediatr Child Health 2016; 52:60-6. [PMID: 26228184 DOI: 10.1111/jpc.12977] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Accepted: 06/28/2015] [Indexed: 11/30/2022]
Abstract
AIMS The aim of this study was to measure urinary C-peptide concentrations, and then calculate C-peptide clearance (Cl), and excretion rate (UER) in neonates. In addition, the effect of gestational age (GA) and blood glucose levels (BGL) on C-peptide UER were investigated. METHODS Insulin concentrations in plasma and C-peptide concentrations were measured in plasma and urine, in 20 neonates. Chemiluminescent immunoassays were used for insulin and C-peptide measurements, with urine diluted to 40% with bovine serum albumin 1% in phosphate buffered saline. Urine volume and time of collection were recorded and used to calculate UER and Cl. RESULTS The mean Cl of C-peptide was 0.309 ± 0.329 mL/min/kg, and UER was 0.0329 ± 0.0342 pmol/min/kg. Correlations between Cl or UER and GA were not significant (P > 0.05). No significant correlation was shown between Cl or UER and BGL (P > 0.05). CONCLUSIONS Both Cl and UER were highly variable in neonates, but were not correlated with GA. Additionally, BGL did not appear to affect C-peptide UER and Cl. As GA and BGL did not appear to affect Cl and UER, urinary C-peptide may provide a non-invasive method of measuring insulin production in neonates.
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Affiliation(s)
- Emma R Salis
- New Zealand's National School of Pharmacy, University of Otago, Dunedin, New Zealand
| | - Mikkel K Soelbeck
- Department of Pharmacy, Faculty of Health and Medical Science, University of Copenhagen, Copenhagen, Denmark
| | - David M Reith
- Department of Women's and Children's Health, Dunedin School of Medicine, University of Otago, Dunedin, New Zealand
| | - Benjamin J Wheeler
- Department of Women's and Children's Health, Dunedin School of Medicine, University of Otago, Dunedin, New Zealand
| | - Roland S Broadbent
- Department of Women's and Children's Health, Dunedin School of Medicine, University of Otago, Dunedin, New Zealand
| | - Natalie J Medlicott
- New Zealand's National School of Pharmacy, University of Otago, Dunedin, New Zealand
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Prasad C, Imrhan V, Juma S, Maziarz M, Prasad A, Tiernan C, Vijayagopal P. Bioactive Plant Metabolites in the Management of Non-Communicable Metabolic Diseases: Looking at Opportunities beyond the Horizon. Metabolites 2015; 5:733-65. [PMID: 26703752 PMCID: PMC4693193 DOI: 10.3390/metabo5040733] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/08/2015] [Revised: 12/02/2015] [Accepted: 12/09/2015] [Indexed: 02/06/2023] Open
Abstract
There has been an unprecedented worldwide rise in non-communicable metabolic diseases (NCDs), particularly cardiovascular diseases (CVD) and diabetes. While modern pharmacotherapy has decreased the mortality in the existing population, it has failed to stem the rise. Furthermore, a large segment of the world population cannot afford expensive pharmacotherapy. Therefore, there is an urgent need for inexpensive preventive measures to control the rise in CVD and diabetes and associated co-morbidities. The purpose of this review is to explore the role of food bioactives in prevention of NCDs. To this end, we have critically analyzed the possible utility of three classes of food bioactives: (a) resistant starch, a metabolically resistant carbohydrate known to favorably modulate insulin secretion and glucose metabolism; (b) cyclo (His-Pro), a food-derived cyclic dipeptides; and (c) polyphenol-rich berries. Finally, we have also briefly outlined the strategies needed to prepare these food-bioactives for human use.
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Affiliation(s)
- Chandan Prasad
- Department of Nutrition and Food Sciences, Texas Woman's University, Denton, TX 76204, USA.
- Department of Medicine, LSU Health Sciences Center, New Orleans, LA 70112, USA.
| | - Victorine Imrhan
- Department of Nutrition and Food Sciences, Texas Woman's University, Denton, TX 76204, USA.
| | - Shanil Juma
- Department of Nutrition and Food Sciences, Texas Woman's University, Denton, TX 76204, USA.
| | - Mindy Maziarz
- Department of Nutrition and Food Sciences, Texas Woman's University, Houston, TX 77030, USA.
| | - Anand Prasad
- Department of Medicine, Division of Cardiology, UT Health Science Center at San Antonio, 7703 Floyd Curl Drive, San Antonio, TX 78229, USA.
| | - Casey Tiernan
- Department of Nutrition and Food Sciences, Texas Woman's University, Denton, TX 76204, USA.
| | - Parakat Vijayagopal
- Department of Nutrition and Food Sciences, Texas Woman's University, Denton, TX 76204, USA.
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Udiong CEJ, Udoh AE, Etukudoh ME. Evaluation of thyroid function in diabetes mellitus in Calabar, Nigeria. Indian J Clin Biochem 2012; 22:74-8. [PMID: 23105687 DOI: 10.1007/bf02913318] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The prevalence of abnormal thyroid hormone levels in diabetes mellitus in Nigeria is not well described. To determine the incidence of abnormal thyroid hormone levels in diabetics in Calabar, Nigeria, fasting blood samples from 161 diabetic subjects and 105 non-diabetic controls were analysed. Free thyroxine (FT), thyroid stimulating hormone (TSH), total triiodothyronine (T(3)) and total thyroxine (T(4)) kits obtained from Biomerica Inc. of USA were used for the analysis. TSH levels (1.80±1.62) in diabetics were significantly lower (p=0.016) than the level in non-diabetic controls (2.34±1.24). Male diabetics had lower (p<0.05) levels of TSH (1.192±0.68 miu/ml) than diabetic females (1.90±1.70 mlu/mt). The level of T(3) in diabetic males (125±97ng/ml) was higher than the level in females (98±75ng/dl). TSH (F=2.74, p=0.049), T(4)(F=56.87, p=0.001), T(3)(F=56.44, P=0.001) in diabetics and FT(4) (F=5.74, p=0.002) in controls showed significant variation with the ages of the subjects. Out of 161 diabetics subjects studies 26.6% had low plasma thyroid hormone levels (FT(4)>2.01 ng/dl). This study has shown a high incidence (46.5%) of abnormal thyroid hormone levels among the diabetics in Nigeria (hypothyroidism 26.6%, hyperthyroidism, 19.9%). The prevalence of hypothyroidism was higher in women (16.8%) than in men (9.9%), while hyperthyroidism was higher in males (11%) than in females (8%). This study has defined thyroid function status of diabetics in Calabar, Nigeria probably the first of such work in Africa.
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Affiliation(s)
- C E J Udiong
- Department of Chemical Pathology, College of medical Sciences, University of Calabar, PMB 115, Calabar, Cross River State Nigeria
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Focus on cyclo(His-Pro): history and perspectives as antioxidant peptide. Amino Acids 2007; 35:283-9. [DOI: 10.1007/s00726-007-0629-6] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/20/2007] [Accepted: 10/30/2007] [Indexed: 10/22/2022]
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Abstract
Thyrotropin-releasing hormone (TRH) is localized in the brain hypothalamus and stimulates the secretion and synthesis of pituitary thyrotropin (TSH). Although TRH deficiency caused by artificial hypothalamic destructions has been reported to result in significant decreases in TSH secretion in rodents, clinical observations from the patients with possible TRH deficiency did not entirely agree with these animal results. Because of its ubiquitous distribution throughout the brain and in the peripheral tissues, TRH has been suggested to possess a wide variety of functions in these regions. However, the neurobehavioral and peripheral actions of TRH still remains to be established. It has been, therefore, anticipated that detailed analysis of TRH-knockout mice might provide insight into the physiological significance of endogenous TRH. The present review focuses on the phenotypic findings of mice deficient in TRH.
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Affiliation(s)
- Masanobu Yamada
- Department of Medicine and Molecular Science, Gunma University Graduate School of Medicine, Maebashi, Japan
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