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Cheng Q, Liu XC, Chen CL, Huang YQ, Feng YQ, Chen JY. The U-Shaped Association of Non-High-Density Lipoprotein Cholesterol Levels With All-Cause and Cardiovascular Mortality Among Patients With Hypertension. Front Cardiovasc Med 2021; 8:707701. [PMID: 34336961 PMCID: PMC8316599 DOI: 10.3389/fcvm.2021.707701] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/10/2021] [Accepted: 06/15/2021] [Indexed: 01/06/2023] Open
Abstract
Background: Non-high-density lipoprotein cholesterol (non-HDL-C) is a valuable indicator in routine blood lipid tests, but the associations of non-HDL-C with mortality in hypertensive population still remain uncertain. Methods: In the National Health and Nutrition Examination Surveys from 1999 to 2014, participants having hypertension were included and grouped by non-HDL-C levels (<130, 130–159, 160–189, 190–219, and ≥220 mg/dl). Multivariate Cox regression was conducted for calculation of hazard ratios (HR) and 95% confidence interval (CI). To reveal the relationship between non-HDL-C and mortality, Kaplan–Meier survival curves, restricted cubic spline, linear regression, and subgroup analysis were also applied. Results: A total of 12,169 participants (47.52% males, mean age 57.27 ± 15.79 years) were included. During average follow-up of 92.5 months, 1,946 (15.99%) all-cause deaths and 422 (3.47%) cardiovascular deaths occurred. After adjusting for confounders, the association of non-HDL-C with mortality was detected as U-shaped. Threshold values were observed at 158 mg/dl for all-cause mortality and 190 mg/dl as to cardiovascular mortality. Below the threshold, every 10 mg/dl increment in non-HDL-C attributed to relatively low all-cause mortality significantly (HR = 0.94, 95% CI: 0.92–0.96). Above the threshold, non-HDL-C has significant positive associations with both all-cause (HR = 1.03, 95% CI: 1.01–1.05) and cardiovascular mortality (HR = 1.09, 95% CI: 1.05–1.14). For subgroups analysis, similar results were found among participants age <65 years old, non-white population, those were not taking lipid-lowering drugs, and subjects with body mass index (BMI) ≥25 kg/m2. Conclusion: The U-shaped association was detected between non-HDL-C and mortality among hypertensive population.
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Affiliation(s)
- Qi Cheng
- School of Medicine, South China University of Technology, Guangzhou, China.,Department of Cardiology, Guangdong Cardiovascular Institute, Guangdong Provincial People's Hospital, Guangdong Academy of Medical Sciences, Guangzhou, China
| | - Xiao-Cong Liu
- Department of Cardiology, Guangdong Cardiovascular Institute, Guangdong Provincial People's Hospital, Guangdong Academy of Medical Sciences, Guangzhou, China
| | - Chao-Lei Chen
- Department of Cardiology, Guangdong Cardiovascular Institute, Guangdong Provincial People's Hospital, Guangdong Academy of Medical Sciences, Guangzhou, China
| | - Yu-Qing Huang
- Department of Cardiology, Guangdong Cardiovascular Institute, Guangdong Provincial People's Hospital, Guangdong Academy of Medical Sciences, Guangzhou, China
| | - Ying-Qing Feng
- School of Medicine, South China University of Technology, Guangzhou, China.,Department of Cardiology, Guangdong Cardiovascular Institute, Guangdong Provincial People's Hospital, Guangdong Academy of Medical Sciences, Guangzhou, China
| | - Ji-Yan Chen
- School of Medicine, South China University of Technology, Guangzhou, China.,Department of Cardiology, Guangdong Cardiovascular Institute, Guangdong Provincial People's Hospital, Guangdong Academy of Medical Sciences, Guangzhou, China
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Wang H, Zheng Z, Zhang N, Zhou Y, Jin S. Regular transient limb ischemia protects endothelial function against hypercholesterolemic damage in rabbits. Sci Prog 2021; 104:368504211036858. [PMID: 34351826 PMCID: PMC10358469 DOI: 10.1177/00368504211036858] [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] [Indexed: 11/17/2022]
Abstract
Regular transient limb ischemia (RTLI) can prevent atherosclerosis in hypercholesterolemic rabbits. As endothelial dysfunction is the initial factor leading to atherosclerosis, we investigated the effect of RTLI on endothelial function in hypercholesterolemic rabbits. We randomly allocated 15 New Zealand white rabbits to three groups, five animals per group: the hypercholesterolemic group (Group H), the sham RTLI group (Group S), and the RTLI group (Group L). All rabbits received hypercholesterolemic fodder daily. No intervention was performed on the rabbits in Group H. Rabbits in Group S were kept in hutches, with a deflated cuff applied to their left hind limb for 60 min every day. For rabbits in Group L, RTLI (six cycles of 5-min ischemia and 5-min reperfusion of the left hind limb) was applied once daily for 12 weeks. At the end of week 12, a segment of the abdominal aorta was isolated from each rabbit for in vitro measurement of the endothelium-dependent vasodilation (EDV) response to different concentrations of acetylcholine and the endothelium-independent vasodilation (EIV) response to sodium nitroprusside. The EDV response was significantly higher in Group L than in Groups S and H (p < 0.05), with no significant difference between Groups S and H (p > 0.05). There was no difference in the EIV response among the three groups. RTLI could improve the EDV response, protecting endothelial function against hypercholesterolemic damage.
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Affiliation(s)
- Hongli Wang
- Department of Anesthesia, The Fifth Central Hospital of Tianjin, Tianjin, China
| | - Zhinan Zheng
- Department of Anesthesia, The Sixth Affiliated Hospital, Sun Yat-sen University, Guangzhou, China
| | - Nanrong Zhang
- Department of Anesthesia, The Sixth Affiliated Hospital, Sun Yat-sen University, Guangzhou, China
| | - Yan Zhou
- Department of Anesthesia, The Sixth Affiliated Hospital, Sun Yat-sen University, Guangzhou, China
| | - Sanqing Jin
- Department of Anesthesia, The Sixth Affiliated Hospital, Sun Yat-sen University, Guangzhou, China
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3
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Li K, Fan F, Zheng B, Jia J, Liu B, Liu J, Chen C, Zhou J, Zhang Y, Huo Y. Associations between remnant lipoprotein cholesterol and central systolic blood pressure in a Chinese community-based population: a cross-sectional study. Lipids Health Dis 2021; 20:60. [PMID: 34174876 PMCID: PMC8235613 DOI: 10.1186/s12944-021-01490-0] [Citation(s) in RCA: 17] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2021] [Accepted: 06/14/2021] [Indexed: 12/15/2022] Open
Abstract
Background The lipid profile is reportedly related to peripheral blood pressure or pulse wave velocity. However, no studies have investigated the associations between lipid parameters, especially remnant lipoprotein cholesterol (RLP-C), and central systolic blood pressure (cSBP). Methods This study used baseline data of a community-based cohort in Beijing, China. Participants who had been treated with anti-hypertensive or lipid-lowering agents were excluded. RLP-C is equal to total cholesterol (TC) minus the sum of low-density lipoprotein cholesterol (LDL-C) and high-density lipoprotein cholesterol (HDL-C). An Omron HEM-9000AI device was used to measure non-invasive cSBP. The associations between blood lipid profile and non-invasive cSBP were evaluated using multivariable regression models. Results The 5173 included participants were 55.0 ± 8.5 years old; 35.7% (1845) of participants were men. Increased cSBP was significantly associated with increased TC, LDL-C, non-high-density lipoprotein cholesterol (non-HDL-C), triglyceride (TG), and RLP-C but with decreased HDL-C, even after adjusting for possible covariates. When simultaneously entering individual pairs of RLP-C and other blood lipid parameters into the multivariable regression model, RLP-C remained significantly associated with cSBP, even after adjusting for other lipids. Compared with participants who had RLP-C levels in the first quartile (Q1), cSBP for those with RLP-C in Q4 was increased to 4.57 (95% confidence interval [CI]: 3.08–6.06) mmHg after adjusting for LDL-C, 4.50 (95%CI: 2.98–6.02) mmHg after adjusting for TC, 3.91 (95%CI: 1.92–5.89) mmHg after adjusting for TG, 5.15 (95%CI: 3.67–6.63) mmHg after adjusting for HDL-C, and 4.10 (95%CI: 2.36–5.84) mmHg after adjusting for non-HDL-C. Conclusions Increased blood RLP-C level was significantly associated with higher cSBP in a Chinese population, independently of other lipids, which indicates its importance in individual cardiovascular risk assessment.
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Affiliation(s)
- Kaiyin Li
- Department of Cardiology, Peking University First Hospital, No. 8 Xishiku Street, Xicheng District, Beijing, 100034, China
| | - Fangfang Fan
- Department of Cardiology, Peking University First Hospital, No. 8 Xishiku Street, Xicheng District, Beijing, 100034, China
| | - Bo Zheng
- Department of Cardiology, Peking University First Hospital, No. 8 Xishiku Street, Xicheng District, Beijing, 100034, China
| | - Jia Jia
- Department of Cardiology, Peking University First Hospital, No. 8 Xishiku Street, Xicheng District, Beijing, 100034, China
| | - Bo Liu
- Department of Cardiology, Peking University First Hospital, No. 8 Xishiku Street, Xicheng District, Beijing, 100034, China
| | - Jiahui Liu
- Department of Cardiology, Peking University First Hospital, No. 8 Xishiku Street, Xicheng District, Beijing, 100034, China
| | - Chuyun Chen
- Department of Cardiology, Peking University First Hospital, No. 8 Xishiku Street, Xicheng District, Beijing, 100034, China
| | - Jing Zhou
- Department of Cardiology, Peking University First Hospital, No. 8 Xishiku Street, Xicheng District, Beijing, 100034, China.
| | - Yan Zhang
- Department of Cardiology, Peking University First Hospital, No. 8 Xishiku Street, Xicheng District, Beijing, 100034, China. .,Institute of Cardiovascular Disease, Peking University First hospital, No. 8 Xishiku Street, Xicheng District, Beijing, 100034, China.
| | - Yong Huo
- Department of Cardiology, Peking University First Hospital, No. 8 Xishiku Street, Xicheng District, Beijing, 100034, China
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de Lima SLS, Gomes MJC, da Silva BP, Alves NEG, Toledo RCL, Theodoro JMV, Moreira MEDC, Bento JAC, Bassinello PZ, da Matta SLP, De Mejía EG, Martino HSD. Whole flour and protein hydrolysate from common beans reduce the inflammation in BALB/c mice fed with high fat high cholesterol diet. Food Res Int 2019; 122:330-339. [PMID: 31229086 DOI: 10.1016/j.foodres.2019.04.013] [Citation(s) in RCA: 22] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/17/2018] [Revised: 04/04/2019] [Accepted: 04/06/2019] [Indexed: 01/07/2023]
Abstract
Common bean (Phaseolus vulgaris L.) is a source of bioactive peptides, but little is known about its effects on hypercholesterolemia, oxidative stress, and the inflammatory process. Therefore, the aim of this study was to evaluate the effect of whole flour and bean protein hydrolysate of common bean variety Carioca on inflammation and oxidative stress in BALB/c mice. Four experimental groups were included in the study: standard diet (SD), high fat high cholesterol diet (HFC), high fat high cholesterol diet and whole bean flour (HFC-F); and high fat high cholesterol diet and bean protein hydrolysate (HFC-PH). Animals fed with bean protein hydrolysate showed lower weight gain and food intake. Animals fed with whole bean flour showed lower alanine aminotransferase and low-density lipoprotein cholesterol levels than animals fed with bean protein hydrolysate. SOD mRNA was lower in HFC, HFC-F and HFC-PH groups whereas SOD concentration was higher in HFC-F and HFC-PH groups. HSP72 mRNA expression was lower in the HFC-F group in relation to HFC-PH. IL-10 and PPARα mRNA expression was lower in HFC-F and HFC-PH groups in comparison with SD. The whole bean flour and bean protein hydrolysate reduced inflammation and the risk factors for cardiovascular diseases in BALB/c mice.
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Affiliation(s)
| | | | - Bárbara Pereira da Silva
- Department of Nutrition and Health, Federal University of Viçosa, Viçosa, Minas Gerais 36570000, Brazil
| | | | - Renata Celi Lopes Toledo
- Department of Nutrition and Health, Federal University of Viçosa, Viçosa, Minas Gerais 36570000, Brazil
| | | | | | | | - Priscila Zaczuk Bassinello
- Embrapa Rice and Bean, Rodovia GO-462, Km 12. Zona Rural, Santo Antônio de Goiás, Goiás 75375000, Brazil
| | | | - Elvira Gonzalez De Mejía
- Department of Food Science and Human Nutrition, University of Illinois Urbana-Champaign. 228 ERML, MC-051, 1201 West Gregory Drive, Urbana, IL 61801, USA
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Oishi JC, Castro CA, Silva KA, Fabricio V, Cárnio EC, Phillips SA, Duarte ACGDO, Rodrigues GJ. Endothelial Dysfunction and Inflammation Precedes Elevations in Blood Pressure Induced by a High-Fat Diet. Arq Bras Cardiol 2019; 110:558-567. [PMID: 30226915 PMCID: PMC6023639 DOI: 10.5935/abc.20180086] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/18/2017] [Accepted: 10/06/2017] [Indexed: 12/11/2022] Open
Abstract
Background Obesity leads to a chronic inflammatory state, endothelial dysfunction and
hypertension. Objective To establish the time-course of events regarding inflammatory markers,
endothelial dysfunction, systolic blood pressure (SBP) in obesity in only
one experimental model. Methods We fed male Wistar rats (eight-week age) with a standard diet (Control - CT,
n = 35), or palatable high-fat diet (HFD, n = 35) for 24 weeks. Every six
weeks, 7 animals from each group were randomly selected for euthanasia. SBP
and serum levels of interleukin-6, tumor necrosis factor-α,
C-reactive protein, adiponectin and nitric oxide were determined.
Endothelial and vascular smooth muscle functions were determined in
dissected aorta and lipid peroxidation was measured. Statistical
significance was set at p < 0.05. Results Levels of pro-inflammatory cytokines began to increase after six weeks of a
high-fat diet, while those of the anti-inflammatory cytokine adiponectin
decreased. Interestingly, the endothelial function and serum nitric oxide
began to decrease after six weeks in HFD group. The SBP and lipid
peroxidation began to increase at 12 weeks in HFD group. In addition, we
showed that total visceral fat mass was negatively correlated with
endothelial function and positively correlated with SBP. Conclusion Our results show the time-course of deleterious effects and their correlation
with obesity.
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Affiliation(s)
| | | | - Karina Ana Silva
- Universidade Federal de São Carlos (UFSCar), São Paulo, SP - Brazil
| | - Victor Fabricio
- Universidade Federal de São Carlos (UFSCar), São Paulo, SP - Brazil
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Al-Dashti YA, Holt RR, Stebbins CL, Keen CL, Hackman RM. Dietary Flavanols: A Review of Select Effects on Vascular Function, Blood Pressure, and Exercise Performance. J Am Coll Nutr 2018; 37:553-567. [PMID: 29718795 DOI: 10.1080/07315724.2018.1451788] [Citation(s) in RCA: 20] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Abstract
An individual's diet affects numerous physiological functions and can play an important role in reducing the risk of cardiovascular disease. Epidemiological and clinical studies suggest that dietary flavanols can be an important modulator of vascular risk. Diets and plant extracts rich in flavanols have been reported to lower blood pressure, especially in prehypertensive and hypertensive individuals. Flavanols may act in part through signaling pathways that affect vascular function, nitric oxide availability, and the release of endothelial-derived relaxing and constricting factors. During exercise, flavanols have been reported to modulate metabolism and respiration (e.g., maximal oxygen uptake, O2 cost of exercise, and energy expenditure), and reduce oxidative stress and inflammation, resulting in increased skeletal muscle efficiency and endurance capacity. Flavanol-induced reductions in blood pressure during exercise may decrease the work of the heart. Collectively, these effects suggest that flavanols can act as an ergogenic aid to help delay the onset of fatigue. More research is needed to better clarify the effects of flavanols on vascular function, blood pressure regulation, and exercise performance and establish safe and effective levels of intake. Flavanol-rich foods and food products can be useful components of a healthy diet and lifestyle program for those seeking to better control their blood pressure or to enhance their physical activity. Key teaching points • Epidemiological and clinical studies indicate that dietary flavanols can reduce the risk of vascular disease. • Diets and plant extracts rich in flavanols have been reported to lower blood pressure and improve exercise performance in humans. • Mechanisms by which flavanols may reduce blood pressure function include alterations in signaling pathways that affect vascular function, nitric oxide availability, and the release of endothelial-derived relaxation and constriction factors. • Mechanisms by which flavanols may enhance exercise performance include modulation of metabolism and respiration (e.g., maximal oxygen uptake, O2 cost of exercise, and energy expenditure) and reduction of oxidative stress and inflammation. These effects can result in increased skeletal muscle efficiency and endurance capacity. • Further research is needed to clarify the amount, timing, and frequency of flavanol intake for blood pressure regulation and exercise performance.
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Affiliation(s)
- Yousef A Al-Dashti
- a Department of Nutrition , University of California, Davis , Davis , California , USA
| | - Roberta R Holt
- a Department of Nutrition , University of California, Davis , Davis , California , USA
| | - Charles L Stebbins
- b Department of Internal Medicine , University of California, Davis , Davis , California , USA
| | - Carl L Keen
- a Department of Nutrition , University of California, Davis , Davis , California , USA.,b Department of Internal Medicine , University of California, Davis , Davis , California , USA
| | - Robert M Hackman
- a Department of Nutrition , University of California, Davis , Davis , California , USA
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Leskov I, Neville A, Shen X, Pardue S, Kevil CG, Granger DN, Krzywanski DM. Nicotinamide nucleotide transhydrogenase activity impacts mitochondrial redox balance and the development of hypertension in mice. ACTA ACUST UNITED AC 2016; 11:110-121. [PMID: 28087333 DOI: 10.1016/j.jash.2016.12.002] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/12/2016] [Revised: 12/02/2016] [Accepted: 12/06/2016] [Indexed: 02/07/2023]
Abstract
Oxidant stress contributes to the initiation and progression of hypertension (HTN) by enhancing endothelial dysfunction and/or causing perturbations in nitric oxide homeostasis. Differences in mitochondrial function may augment this process and provide insight into why age of onset and clinical outcomes differ among individuals from distinct ethnic groups. We have previously demonstrated that variation in normal mitochondrial function and oxidant production exists in endothelial cells from individuals of Caucasian and African-American ethnicity and that this variation contributes to endothelial dysfunction. To model these distinct mitochondrial redox phenotypes, we used C57Bl/6N (6N) and C57Bl/6J (6J) mice that also display unique mitochondrial functional properties due to the differential expression nicotinamide nucleotide transhydrogenase (NNT). We demonstrate that the absence of NNT in 6J cells led to distinct mitochondrial bioenergetic profiles and a pro-oxidative mitochondrial phenotype characterized by increased superoxide production and reduced glutathione peroxidase activity. Interestingly, we found that 6J animals have significantly higher systolic blood pressure compared to 6N animals, and this difference is exacerbated by angiotensin II treatment. The changes in pressure were accompanied by both mitochondrial and vascular dysfunction revealed by impaired respiratory control ratios and endothelial-dependent vessel dilation. All end points could be significantly ameliorated by treatment with the mitochondria-targeted superoxide dismutase mimetic MitoTEMPO demonstrating a critical role for the production of mitochondrial reactive oxygen species in the development of HTN in these animals. Taken together, these data indicate that the absence of NNT leads to variation in mitochondrial function and contributes to a unique mitochondrial redox phenotype that influences susceptibility to HTN by contributing to endothelial and vascular dysfunction.
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Affiliation(s)
- Igor Leskov
- Department of Cellular Biology and Anatomy, School of Medicine, Shreveport, LA, USA; Center for Cardiovascular Diseases and Sciences, Louisiana State University Health Sciences Center-Shreveport, Shreveport, LA, USA
| | - Amber Neville
- Department of Cellular Biology and Anatomy, School of Medicine, Shreveport, LA, USA; Center for Cardiovascular Diseases and Sciences, Louisiana State University Health Sciences Center-Shreveport, Shreveport, LA, USA
| | - Xinggui Shen
- Center for Cardiovascular Diseases and Sciences, Louisiana State University Health Sciences Center-Shreveport, Shreveport, LA, USA; Department of Pathology, School of Medicine, Shreveport, LA, USA
| | - Sibile Pardue
- Center for Cardiovascular Diseases and Sciences, Louisiana State University Health Sciences Center-Shreveport, Shreveport, LA, USA; Department of Pathology, School of Medicine, Shreveport, LA, USA
| | - Christopher G Kevil
- Center for Cardiovascular Diseases and Sciences, Louisiana State University Health Sciences Center-Shreveport, Shreveport, LA, USA; Department of Pathology, School of Medicine, Shreveport, LA, USA
| | - D Neil Granger
- Center for Cardiovascular Diseases and Sciences, Louisiana State University Health Sciences Center-Shreveport, Shreveport, LA, USA; Department of Molecular and Cellular Physiology, School of Medicine, Shreveport, LA, USA
| | - David M Krzywanski
- Department of Cellular Biology and Anatomy, School of Medicine, Shreveport, LA, USA; Center for Cardiovascular Diseases and Sciences, Louisiana State University Health Sciences Center-Shreveport, Shreveport, LA, USA.
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Overview of Antagonists Used for Determining the Mechanisms of Action Employed by Potential Vasodilators with Their Suggested Signaling Pathways. Molecules 2016; 21:495. [PMID: 27092479 PMCID: PMC6274436 DOI: 10.3390/molecules21040495] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/27/2016] [Revised: 03/23/2016] [Accepted: 03/28/2016] [Indexed: 01/04/2023] Open
Abstract
This paper is a review on the types of antagonists and the signaling mechanism pathways that have been used to determine the mechanisms of action employed for vasodilation by test compounds. Thus, we exhaustively reviewed and analyzed reports related to this topic published in PubMed between the years of 2010 till 2015. The aim of this paperis to suggest the most appropriate type of antagonists that correspond to receptors that would be involved during the mechanistic studies, as well as the latest signaling pathways trends that are being studied in order to determine the route(s) that atest compound employs for inducing vasodilation. The methods to perform the mechanism studies were included. Fundamentally, the affinity, specificity and selectivity of the antagonists to their receptors or enzymes were clearly elaborated as well as the solubility and reversibility. All the signaling pathways on the mechanisms of action involved in the vascular tone regulation have been well described in previous review articles. However, the most appropriate antagonists that should be utilized have never been suggested and elaborated before, hence the reason for this review.
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Yildirim A, Senchenkova E, Granger DN. Hypercholesterolemia blunts the oxidative stress elicited by hypertension in venules through angiotensin II type-2 receptors. Microvasc Res 2016; 105:54-60. [PMID: 26775070 DOI: 10.1016/j.mvr.2016.01.002] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/01/2015] [Revised: 01/10/2016] [Accepted: 01/11/2016] [Indexed: 02/07/2023]
Abstract
OBJECTIVE Hypertension and hypercholesterolemia elicit inflammatory and thrombogenic responses in the microvasculature. However, little is known about whether and how risk factor combinations alter microvascular function. We examined how the actions of HTN+HCh on the microvasculature differ from the responses elicited by either risk factor alone. METHODS Intravital microscopy was used to monitor the adhesion and emigration of leukocytes and dihydrorhodamine oxidation in cremaster muscle venules of wild type mice that were infused with angiotensin II for 2 weeks (HTN), placed on a high cholesterol diet (HCD), or both. RESULTS Either HTN or HCh alone enhanced the production of reactive oxygen species and promoted the recruitment of leukocytes in venules. However, the combination of HTN and HCh produced changes in ROS production and leukocyte recruitment that were greatly attenuated compared to HTN alone. The inhibitory effects of HCh on the AngII mediated responses were also observed in genetically-induced HCh (ApoE-deficient mice). Treating HCh+HTN mice with an antagonist to AT2r reversed the HCh-dependent protection against oxidative stress and inflammation during HTN. CONCLUSIONS These findings indicate that HCh blunts the oxidative stress and inflammatory cell recruitment elicited by hypertension in venules through a mechanism that involves AT2 receptor activation.
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Affiliation(s)
- Alper Yildirim
- Department of Molecular & Cellular Physiology, LSU Health Sciences Center, Shreveport, Louisiana 71130, United States
| | - Elena Senchenkova
- Department of Molecular & Cellular Physiology, LSU Health Sciences Center, Shreveport, Louisiana 71130, United States
| | - D Neil Granger
- Department of Molecular & Cellular Physiology, LSU Health Sciences Center, Shreveport, Louisiana 71130, United States.
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Abstract
The aim of this review article is to summarize the current knowledge about mechanisms that connect blood pressure regulation and hypercholesterolemia, the mutual interaction between hypertension and hypercholesterolemia, and their influence on atherosclerosis development. Our research shows that at least one-third of the population of Western Europe has hypertension and hypercholesterolemia. Several biohumoral mechanisms could explain the relationship between hypertension and hypercholesterolemia and the association between these risk factors and accelerated atherosclerosis. The most investigated mechanisms are the renin-angiotensin-aldosterone system, oxidative stress, endothelial dysfunction, and increased production of endothelin-1. Arterial hypertension is frequently observed in combination with hypercholesterolemia, and this is related to accelerated atherosclerosis. Understanding the mechanisms behind this relationship could help explain the benefits of therapy that simultaneously reduce blood pressure and cholesterol levels.
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11
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Clark JL, Zahradka P, Taylor CG. Efficacy of flavonoids in the management of high blood pressure. Nutr Rev 2015; 73:799-822. [PMID: 26491142 DOI: 10.1093/nutrit/nuv048] [Citation(s) in RCA: 70] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023] Open
Abstract
Plant compounds such as flavonoids have been reported to exert beneficial effects in cardiovascular disease, including hypertension. Information on the effects of isolated individual flavonoids for management of high blood pressure, however, is more limited. This review is focused on the flavonoids, as isolated outside of the food matrix, from the 5 main subgroups consumed in the Western diet (flavones, flavonols, flavanones, flavan-3-ols, and anthocyanins), along with their effects on hypertension, including the potential mechanisms for regulating blood pressure. Flavonoids from all 5 subgroups have been shown to attenuate a rise in or to reduce blood pressure during several pathological conditions (hypertension, metabolic syndrome, and diabetes mellitus). Flavones, flavonols, flavanones, and flavanols were able to modulate blood pressure by restoring endothelial function, either directly, by affecting nitric oxide levels, or indirectly, through other pathways. Quercetin had the most consistent blood pressure-lowering effect in animal and human studies, irrespective of dose, duration, or disease status. However, further research on the safety and efficacy of the flavonoids is required before any of them can be used by humans, presumably in supplement form, at the doses required for therapeutic benefit.
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Affiliation(s)
- Jaime L Clark
- J.L. Clark, P. Zahradka, and C.G. Taylor are with the Department of Human Nutritional Sciences, University of Manitoba, Manitoba, Canada. P. Zahradka and C.G. Taylor are with the Department of Physiology and Pathophysiology, University of Manitoba, Manitoba, Canada. J.L. Clark, P. Zahradka, and C.G. Taylor are with the Canadian Centre for Agri-Food Research in Health and Medicine, St Boniface Research Centre, Winnipeg, Manitoba, Canada
| | - Peter Zahradka
- J.L. Clark, P. Zahradka, and C.G. Taylor are with the Department of Human Nutritional Sciences, University of Manitoba, Manitoba, Canada. P. Zahradka and C.G. Taylor are with the Department of Physiology and Pathophysiology, University of Manitoba, Manitoba, Canada. J.L. Clark, P. Zahradka, and C.G. Taylor are with the Canadian Centre for Agri-Food Research in Health and Medicine, St Boniface Research Centre, Winnipeg, Manitoba, Canada
| | - Carla G Taylor
- J.L. Clark, P. Zahradka, and C.G. Taylor are with the Department of Human Nutritional Sciences, University of Manitoba, Manitoba, Canada. P. Zahradka and C.G. Taylor are with the Department of Physiology and Pathophysiology, University of Manitoba, Manitoba, Canada. J.L. Clark, P. Zahradka, and C.G. Taylor are with the Canadian Centre for Agri-Food Research in Health and Medicine, St Boniface Research Centre, Winnipeg, Manitoba, Canada.
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Zheng YL, Yan BP, Zhang YT, Poon CCY. Noninvasive Characterization of Vascular Tone by Model-Based System Identification in Healthy and Heart Failure Patients. Ann Biomed Eng 2015; 43:2242-52. [PMID: 25650099 DOI: 10.1007/s10439-015-1266-y] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/20/2014] [Accepted: 01/24/2015] [Indexed: 10/24/2022]
Abstract
Current markers for heart failure (HF) diagnosis and prognosis are mainly for the evaluation of cardiac functions. Since previous studies have reported that HF patients demonstrated abnormal vascular responses to external stimuli, it is speculated that vascular tone, a measure of activation level of vascular wall, may be able to reflect these abnormalities to assist HF detection. Nevertheless, vascular tone is difficult to be objectively quantified using existing tools. In this study, a vascular tone index was estimated from noninvasive blood pressure and pulse transit time measurements using system identification technique. This method was evaluated in 35 subjects (10 healthy, 13 with HF risk factors and 12 HF patients) in a regular maximal exercise test. It was found that the vascular tone index significantly increased by 24.4 ± 26.6% (p < 0.01) during maximal exercise in the healthy subjects. Moreover, the response was gradually attenuated in the risk-factor and HF groups (15.8 ± 36.5 and 0.9 ± 17.9%, respectively). The results reveal the association between the vascular tone response to maximal exercise and HF disease or risks. To conclude, the proposed method provides a quantitative characterization of vascular tone which may be a useful indicator of the pathological changes of the arteries or the heart.
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Affiliation(s)
- Ya-Li Zheng
- Department of Surgery, The Chinese University of Hong Kong, Shatin, Hong Kong
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Rodrigues SF, Almeida-Paula LD, Granger DN. Synergistic effects of high blood cholesterol and hypertension on leukocyte and platelet recruitment in the cerebral microcirculation. Hypertension 2013; 63:747-52. [PMID: 24379186 DOI: 10.1161/hypertensionaha.113.02627] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
Abstract
Hypertension or hypercholesterolemia can induce a proinflammatory and prothrombogenic phenotype in the microcirculation of the brain; however, less is known about how the combination of these risk factors affects the vasculature. We recently reported that a moderate (60%) increase in plasma cholesterol blunts the recruitment of leukocytes and platelets in the cerebral microvessels elicited by hypertension. In this study, we examined whether larger increments in blood cholesterol (4-fold) exerts a similar modulating influence on the vasculature in the presence of hypertension. Apolipoprotein E-knockout mice with deoxycorticosterone acetate salt-induced hypertension were placed on a high-cholesterol diet and exhibited exaggerated leukocyte and platelet adhesion responses in cerebral microvessels. Intermittent feeding (every fourth day) with high-cholesterol diet yielded similar phenotypic changes in the vasculature. Once the mice were placed on high-cholesterol diet, 4 days on normal diet (ND) were needed to revert to a normal vascular phenotype. Angiotensin II type 1 receptors and reactive oxygen species seem to contribute to the vascular responses induced by hypercholesterolemia and hypertension. Our findings indicate that the combination of hypertension and large increases in plasma cholesterol concentration results in a severe, but reversible, inflammatory and thrombogenic phenotype in the cerebral microvasculature.
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Affiliation(s)
- Stephen F Rodrigues
- Department of Molecular and Cellular Physiology, LSU Health Sciences Center, 1501 Kings Highway, Shreveport, LA 71130-3932.
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