Biological nanotechnologies have provided considerable opportunities in the management of malignancies with delicate design and negligible toxicity,from preventive and diagnostic to therapeutic fields.Lipoproteins,bec...Biological nanotechnologies have provided considerable opportunities in the management of malignancies with delicate design and negligible toxicity,from preventive and diagnostic to therapeutic fields.Lipoproteins,because of their inherent blood-brain barrier permeability and lesion-homing capability,have been identified as promising strategies for high-performance theranostics of brain diseases.However,the application of natural lipoproteins remains limited owing to insufficient accumulation and complex purification processes,which can be critical for individual therapeutics and clinical translation.To address these issues,lipoprotein-inspired nano drug-delivery systems(nano-DDSs),which have been learned from nature,have been fabricated to achieve synergistic drug delivery involving site-specific accumulation and tractable preparation with versatile physicochemical functions.In this review,the barriers in brain disease treatment,advantages of state-of-the-art lipoprotein-inspired nano-DDSs,and bio-interactions of such nano-DDSs are highlighted.Furthermore,the characteristics and advanced applications of natural lipoproteins and tailor-made lipoprotein-inspired nano-DDSs are summarized.Specifically,the key designs and current applications of lipoprotein-inspired nano-DDSs in the field of brain disease therapy are intensively discussed.Finally,the current challenges and future perspectives in the field of lipoprotein-inspired nano-DDSs combined with other vehicles,such as exosomes,cell membranes,and bacteria,are discussed.展开更多
Objective Foreign studies have reported that coronary artery disease(CAD) patients with high baseline low-density lipoprotein cholesterol(LDL-C) may have a good prognosis, which is called the “cholesterol paradox”. ...Objective Foreign studies have reported that coronary artery disease(CAD) patients with high baseline low-density lipoprotein cholesterol(LDL-C) may have a good prognosis, which is called the “cholesterol paradox”. This study aimed to examine whether the “cholesterol paradox” also exists in the Chinese population.Methods A total of 2,056 patients who underwent the first percutaneous coronary intervention(PCI)between 2014 and 2016 were enrolled in this retrospective cohort study and classified into two groups based on baseline LDL-C = 2.6 mmol/L(100 mg/d L). The outcomes of interest included major adverse cardiovascular events(MACE), all-cause mortality, recurrent nonfatal myocardial infarction, unexpected coronary revascularization, or any nonfatal stroke.Results All-cause mortality occurred in 8 patients(0.7%) from the low-LDL-C group and 12 patients(2.4%) in the high-LDL-C group, with a significant difference between the two groups(adjusted hazard ratio: 4.030, 95% confidence interval: 1.088–14.934;P = 0.037). However, no significant differences existed for the risk of MACE or other secondary endpoints, such as unexpected revascularization, nor any nonfatal stroke in the two groups.Conclusion In this study, a high baseline LDL-C was not associated with a low risk of clinical outcomes in CAD patients undergoing first PCI, which suggested that the “cholesterol paradox” may be inapplicable to Chinese populations.展开更多
Diabetic dyslipidemia is characterized by quantitative and qualitative abnormalities in lipoproteins.In addition to glycation and oxidation,carbamylation is also a post-translational modification affecting lipoprotein...Diabetic dyslipidemia is characterized by quantitative and qualitative abnormalities in lipoproteins.In addition to glycation and oxidation,carbamylation is also a post-translational modification affecting lipoproteins in diabetes.Patients with type 2 diabetes(T2D)exhibit higher levels of carbamylated low-density lipoproteins(cLDL)and high-density lipoproteins(cHDL).Accumulating evidence suggests that cLDL plays a role in atherosclerosis in diabetes.cLDL levels have been shown to predict cardiovascular events and all-cause mortality.cLDL facilitates immune cell recruitment in the vascular wall,promotes accumulation of lipids in macrophages,and contributes to endothelial dysf-unction,endothelial nitric oxide-synthase(eNOS)inactivation and endothelial repair defects.Lastly,cLDL induces thrombus formation and platelet aggregation.On the other hand,recent data have demonstrated that cHDL serum level is independently associated with all-cause and cardiovascular-related mortality in T2D patients.This relationship may be causative since the atheroprotective properties of HDL are altered after carbamylation.Thus,cHDL loses the ability to remove cholesterol from macrophages,to inhibit monocyte adhesion and recruitment,to induce eNOS activation and to inhibit apoptosis.Taken together,it seems very likely that the abnormalities in the biological functions of LDL and HDL after carbamylation contribute to atherosclerosis and to the elevated cardiovascular risk in diabetes.展开更多
Hepatitis C virus(HCV) infects over 150 million people worldwide. In most cases, HCV infection becomes chronic causing liver disease ranging from fibrosis to cirrhosis and hepatocellular carcinoma. Viral persistence a...Hepatitis C virus(HCV) infects over 150 million people worldwide. In most cases, HCV infection becomes chronic causing liver disease ranging from fibrosis to cirrhosis and hepatocellular carcinoma. Viral persistence and pathogenesis are due to the ability of HCV to deregulate specific host processes, mainly lipid metabolism and innate immunity. In particular, HCV exploits the lipoprotein machineries for almost all steps of its life cycle. The aim of this review is to summarize current knowledge concerning the interplay between HCV and lipoprotein metabolism. We discuss the role played by members of lipoproteins in HCV entry, replication and virion production.展开更多
Patients with type 2 diabetes mellitus(T2DM) frequently exhibit macrovascular complications of atherosclerotic cardiovascular(CV) disease. High density lipoproteins(HDL) are protective against atherosclerosis. Low lev...Patients with type 2 diabetes mellitus(T2DM) frequently exhibit macrovascular complications of atherosclerotic cardiovascular(CV) disease. High density lipoproteins(HDL) are protective against atherosclerosis. Low levels of HDL cholesterol(HDL-C) independently contribute to CV risk. Patients with T2 DM not only exhibit low HDL-C, but also dysfunctional HDL. Furthermore, low concentration of HDL may increase the risk for the development of T2 DM through a decreased β cell survival and secretory function. In this paper, we discuss emerging concepts in the relationship of T2 DM with HDL.展开更多
Cymbopogon citratus(lemon grass)is commonly used in traditional folk medicine.The essential oil extracted from C.citratus has been reported as a potential anti-oxidant and anti-inflammatory agent.This study has been d...Cymbopogon citratus(lemon grass)is commonly used in traditional folk medicine.The essential oil extracted from C.citratus has been reported as a potential anti-oxidant and anti-inflammatory agent.This study has been designed to explore the protective effect of C.citratus(lemon grass)against modified LDL(OxLDL and H2O2 LDL)induced cytotoxicity in Peripheral Blood Mononuclear Cells(PBMC).The essential oil extracted from C.citratus(EOC)was subjected to FT-IR spectroscopic analysis for the identification of functional groups.In vitro antioxidant assays were carried out to assess the electron donating capability of EOC as compared with a known standard L-ascorbic acid.The cytoprotective effects of EOC were determined in PBMC induced with modified LDL.Spectra obtained from FT-IR analysis showed the presence of functional groups in EOC such as H-bonded,O-H stretching,N-H stretching,aldehyde-C-H stretching,aldehyde/ketone-C=O stretching,-C=C-stretching,-CH_(3) bending,-C-H in plane bending.EOC has greater antioxidant property when compared with the standard L-ascorbic acid.EOC at all test concentrations demonstrated free radical scavenging activity and cytoprotective effect when challenged against modified LDL in PBMC.The above results show EOC as a promising antioxidant and cytoprotective agent.展开更多
1 INTRODUCTION It’s evident that high level of cholesterol in blood is associated with the formation and devel-opment of familial hypercholestrolemia(FH)and atherosclerosis(AS).In general,choles-terol in blood is mai...1 INTRODUCTION It’s evident that high level of cholesterol in blood is associated with the formation and devel-opment of familial hypercholestrolemia(FH)and atherosclerosis(AS).In general,choles-terol in blood is mainly combined with low-density lipoproteins(LDL),very low-densitylipoproteins(VLDL)and high density lipoproteins(HDL).About 60%-80% cholesterolexists in LDL and VLDL.LDL and VLDL have been recognized as the principal展开更多
AIM:To evaluate the direct binding of two main chlamydial biovars(C.trachomatis and C.pneumoniae) to plasma lipoproteins and its effect on chlamydial infection rate in human hepatoma cell line(HepG2 cells). METHODS:Mu...AIM:To evaluate the direct binding of two main chlamydial biovars(C.trachomatis and C.pneumoniae) to plasma lipoproteins and its effect on chlamydial infection rate in human hepatoma cell line(HepG2 cells). METHODS:Murine plasma lipoproteins were fractionated and isolated using fast-performance liquid chromatography(FPLC),spotted on nitrocellulose membrane and incubated with chlamydial suspensions. Direct binding of chlamydial particles to lipoprotein fractions has been studied using lipopolysaccharide-specific antibodies in immuno-dot blot binding assay and immunoprecipitation analysis.Immunostaining protocol as well as flow cytometry analysis have been employed to study the infectivity rate of chlamydial species in HepG2 cells. RESULTS:Elementary bodies of both C.trachomatis and C.pneumoniae bind ApoB-containing fractions of plasma lipoproteins.That binding becomes stronger when heat-denatured FPLC fractions are used, suggesting a primary role of apolipoproteins in interaction between chlamydial particle and lipoprotein. Both chlamydial biovars efficiently propagate in human hepatoma cell line-HepG2 cells even in serum free conditions forming late-stage inclusion bodies and releasing extracellular elementary bodies.Preincubation of C.trachomatis and C.pneumoniae with native ApoB-containing lipoproteins enhances the rate of chlamydial infection in HepG2 cells.CONCLUSION:A productive infection caused by C. trachomatis and C.pneumoniae may take place in human-derived hepatocytes revealing hepatic cells as possible target in chlamydial infection.Obtained results may suggest the participation of lipoprotein receptors in the mechanism of attachment and/or entry of chlamydial particles into target cells.展开更多
Objective To study the releases of endothelin-1 and prostacyclin by endothelial cells in culture and to elucidate how these releases were influenced by smoke-treated low density lipoprotein. Methods We exposed en- dot...Objective To study the releases of endothelin-1 and prostacyclin by endothelial cells in culture and to elucidate how these releases were influenced by smoke-treated low density lipoprotein. Methods We exposed en- dothelial cell cultures to native or oxidized low density lipoproteins,low density lipoproteins treated by dimethylsul- foxide-soluble particles from cigarette smoke or dimethylsulfoxide alones. The release of endothelin-1 was assayed by bioassay and the release of prostacyclin was assayed by radioimmunoassay. Results Low density lipoproteins treated by smoke significantly increased the release or endothelin-1 (P<0.025) and decreased the release of prostacyclin (P< 0.02) by endothelial cells in culture, contrast to native or dimethylsulfoxide-treated lipoproteins. Conclusion The main part or vasoconstrictor activity in conditioned medium from bovine aortic EC is endothelin-1.展开更多
Background. The effects of physical exercises combined with a low-calorie diet on weight loss, body composition, lipoproteins profile, and physical fitness had been well described. However, Central Africa’s studies i...Background. The effects of physical exercises combined with a low-calorie diet on weight loss, body composition, lipoproteins profile, and physical fitness had been well described. However, Central Africa’s studies investigating these kinds of diets and exercise regimens are lacking. Objective. To investigate the effects of adding 14-weeks exercises to a hypocaloric diet on changes in body composition, lipoproteins concentrations, and physical capacities in obese Congolese women. Population and Methods. In total, 34 obese women aged 30 - 39 years (mean age: 33.7 ± 2.4 years) assigned to 14-weeks training program and low energy ketogenic diet. Body composition was assessed using classic methods and impedancemetry. Fasting plasma glucose (FPG) and fasting serum insulin were assessing using enzymatic colorimetric and radioim-munoradiometric methods. HOMA-IR and lipoproteins concentrations were assessed using standardized laboratory methods. VO2peak was measured on a treadmill during a progressive exercise test. Speed, cadence and stride length were measured along the 10-m level walkway. Muscular endurance was measured using the tests of sit-up and inflections-extensions of elbows. All the variables of the study were assessed at the beginning, in the 7-weeks, and in the 14-weeks of training methods. Results. Declines in body weight (16%), percent fat (12.1%), fat weight (26.4%), abdominal fat (34.2%), and waist circumference (10.4%) were found. A significant decrease in FPG (13%), fasting serum insulin (60.9%), HOMA-IR (64.7%), total cholesterol (12.2%), LDL-cholesterol (20.3%), triglycerides (92.8%), and VLDL-triglycerides (17.5%) was shown. In contrast, significant increase in HDL-cholesterol (27.13%) was found. The peak oxygen consumption VO2peak relative to body weight improved more in the 14-weeks training program (13.4%). Obese women exhibited higher values in the 14-weeks training program for speed gait (16.5%), cadence (9.1%), and stride length (15.7%) during normal walk and rapid walk. Weight loss combined with a low-calorie diet and 14-weeks training program improved significantly muscular endurance capacities. Conclusion. Exercise added to hypocaloric diet leads to decreases in body composition, to improve in insulin sensitivity, to enhancement of VO2peak and functional fitness. This may be helpful for the treatment of the metabolic complications of abdominal obesity.展开更多
Object To elucidate the physiological significance of the spiral flow in the arterial system from the viewpoint of atherogenic lipid transport,an ex vivo experimental comparative
Emerging data now indicate and address the strong relationship between H. pylori infection and the incidence of Type 2 DM, a growing body of evidence suggests that the infection with H. pylori may be associated with i...Emerging data now indicate and address the strong relationship between H. pylori infection and the incidence of Type 2 DM, a growing body of evidence suggests that the infection with H. pylori may be associated with insulin resistance, chronic inflammation, long-term diabetes complications, and cardiovascular risk factors. The present study was conducted to evaluate the relationship between the infection with Helicobacter pylori and disturbance in Lipid profile in Type 2 Diabetic patients. One hundred and five participants were enrolled, categorized into two groups of H. pylori positive cases and negative controls according to their results of H. pylori IgG antibodies. Subjects in both groups fill the structured questionnaire. Blood samples were drawn for measuring the FBS, 2hr-PP blood sugar, HbA1c, Lipid profile and oxidized LDL. The obtained results were statistically analyzed. The study methodology was approved by the Biomedical Ethics Committee in the Faculty of Medicine, Umm Al-Qura University, Makkah, KSA. 48 cases (45.7%) were diagnosed as H. pylori seropositive and 57 (54.3%) were negative. There is no significant difference in the mean age or mean BMI between the H. pylori negative and positive cases. Glycemic control was similar in the two groups. Total Cholesterol was higher in cases of positive H. pylori compared to negative controls (P < 0.001) and Triglycerides was significantly elevated too (P < 0.005). No significant difference in the levels of HDL-Cholesterol between the two groups, while the mean LDL-Cholesterol was found to be significantly increased in cases of H. pylori positive compared to negative controls (P < 0.001). Oxidized LDL levels in the positive cases was found to be increased significantly (P = 0.001) compared to negative controls. Infection with H. pylori is associated with increased levels of Total Cholesterol, Triglycerides, LDL-C and oxidized LDL in Type 2 Diabetic patients.展开更多
Rheological effects of acute and chronic HELP - treatment
The acute reduction of rheologically relevant plasma constituents such as fibrinogen and largesized lipoproteins significantly improves whole blood a... Rheological effects of acute and chronic HELP - treatment
The acute reduction of rheologically relevant plasma constituents such as fibrinogen and largesized lipoproteins significantly improves whole blood and plasma viscosity by a decrease of approximately 15%, erythrocyte aggregability decreases by 53% whereas erythrocyte filtrability improves by 10% (figure 3).……展开更多
基金financial support from the National Natural Science Foundation of China(No.82274104,82074024,82374042)the Open Project of Chinese Materia Medica FirstClass Discipline of Nanjing University of Chinese Medicine(No.2020YLXK019)Young Elite Scientists Sponsorship Program by CACM(No.2021-QNRC2-A01)
文摘Biological nanotechnologies have provided considerable opportunities in the management of malignancies with delicate design and negligible toxicity,from preventive and diagnostic to therapeutic fields.Lipoproteins,because of their inherent blood-brain barrier permeability and lesion-homing capability,have been identified as promising strategies for high-performance theranostics of brain diseases.However,the application of natural lipoproteins remains limited owing to insufficient accumulation and complex purification processes,which can be critical for individual therapeutics and clinical translation.To address these issues,lipoprotein-inspired nano drug-delivery systems(nano-DDSs),which have been learned from nature,have been fabricated to achieve synergistic drug delivery involving site-specific accumulation and tractable preparation with versatile physicochemical functions.In this review,the barriers in brain disease treatment,advantages of state-of-the-art lipoprotein-inspired nano-DDSs,and bio-interactions of such nano-DDSs are highlighted.Furthermore,the characteristics and advanced applications of natural lipoproteins and tailor-made lipoprotein-inspired nano-DDSs are summarized.Specifically,the key designs and current applications of lipoprotein-inspired nano-DDSs in the field of brain disease therapy are intensively discussed.Finally,the current challenges and future perspectives in the field of lipoprotein-inspired nano-DDSs combined with other vehicles,such as exosomes,cell membranes,and bacteria,are discussed.
基金supported by the Ethics Committee of Sir Run Run Shaw Hospital of Zhejiang University [NO.20200224-33]Key Project of Medical and Health Science and Technology of Zhejiang Province [NO. WKJ-ZJ-1715]+7 种基金Zhejiang Province Traditional Chinese Medicine Science and Technology Project [NO. 2017ZA006]Natural Science Foundation of Zhejiang Province [NO. LQ17H020006]Medical health Science and Technology project of Zhejiang Province [NO. 2017KY207]National Natural Science Foundation of China [82070408]Medical and health project [2021RC014]Hangzhou Medical Health Science and Technology Project [B20200116]“Pioneer” and “Leading Goose” R&D Program of Zhejiang[2023C04013]Administration of Traditional Chinese Medicine of Zhejiang Province [GZY-ZJ-KJ-23001]。
文摘Objective Foreign studies have reported that coronary artery disease(CAD) patients with high baseline low-density lipoprotein cholesterol(LDL-C) may have a good prognosis, which is called the “cholesterol paradox”. This study aimed to examine whether the “cholesterol paradox” also exists in the Chinese population.Methods A total of 2,056 patients who underwent the first percutaneous coronary intervention(PCI)between 2014 and 2016 were enrolled in this retrospective cohort study and classified into two groups based on baseline LDL-C = 2.6 mmol/L(100 mg/d L). The outcomes of interest included major adverse cardiovascular events(MACE), all-cause mortality, recurrent nonfatal myocardial infarction, unexpected coronary revascularization, or any nonfatal stroke.Results All-cause mortality occurred in 8 patients(0.7%) from the low-LDL-C group and 12 patients(2.4%) in the high-LDL-C group, with a significant difference between the two groups(adjusted hazard ratio: 4.030, 95% confidence interval: 1.088–14.934;P = 0.037). However, no significant differences existed for the risk of MACE or other secondary endpoints, such as unexpected revascularization, nor any nonfatal stroke in the two groups.Conclusion In this study, a high baseline LDL-C was not associated with a low risk of clinical outcomes in CAD patients undergoing first PCI, which suggested that the “cholesterol paradox” may be inapplicable to Chinese populations.
文摘Diabetic dyslipidemia is characterized by quantitative and qualitative abnormalities in lipoproteins.In addition to glycation and oxidation,carbamylation is also a post-translational modification affecting lipoproteins in diabetes.Patients with type 2 diabetes(T2D)exhibit higher levels of carbamylated low-density lipoproteins(cLDL)and high-density lipoproteins(cHDL).Accumulating evidence suggests that cLDL plays a role in atherosclerosis in diabetes.cLDL levels have been shown to predict cardiovascular events and all-cause mortality.cLDL facilitates immune cell recruitment in the vascular wall,promotes accumulation of lipids in macrophages,and contributes to endothelial dysf-unction,endothelial nitric oxide-synthase(eNOS)inactivation and endothelial repair defects.Lastly,cLDL induces thrombus formation and platelet aggregation.On the other hand,recent data have demonstrated that cHDL serum level is independently associated with all-cause and cardiovascular-related mortality in T2D patients.This relationship may be causative since the atheroprotective properties of HDL are altered after carbamylation.Thus,cHDL loses the ability to remove cholesterol from macrophages,to inhibit monocyte adhesion and recruitment,to induce eNOS activation and to inhibit apoptosis.Taken together,it seems very likely that the abnormalities in the biological functions of LDL and HDL after carbamylation contribute to atherosclerosis and to the elevated cardiovascular risk in diabetes.
基金Supported by AIRC(to Tripodi MNo.IG-13529 to Fimia GM)+6 种基金Ministry for Health of Italy(“Ricerca Corrente”to Grassi GTripodi MAlonzi TFimia GM and Ippolito G“Ricerca Finalizzata”to Fimia GM and Ippolito G)Ministry of University and Research of Italy(PRIN to Tripodi MPh D program to Di Caprio G)
文摘Hepatitis C virus(HCV) infects over 150 million people worldwide. In most cases, HCV infection becomes chronic causing liver disease ranging from fibrosis to cirrhosis and hepatocellular carcinoma. Viral persistence and pathogenesis are due to the ability of HCV to deregulate specific host processes, mainly lipid metabolism and innate immunity. In particular, HCV exploits the lipoprotein machineries for almost all steps of its life cycle. The aim of this review is to summarize current knowledge concerning the interplay between HCV and lipoprotein metabolism. We discuss the role played by members of lipoproteins in HCV entry, replication and virion production.
文摘Patients with type 2 diabetes mellitus(T2DM) frequently exhibit macrovascular complications of atherosclerotic cardiovascular(CV) disease. High density lipoproteins(HDL) are protective against atherosclerosis. Low levels of HDL cholesterol(HDL-C) independently contribute to CV risk. Patients with T2 DM not only exhibit low HDL-C, but also dysfunctional HDL. Furthermore, low concentration of HDL may increase the risk for the development of T2 DM through a decreased β cell survival and secretory function. In this paper, we discuss emerging concepts in the relationship of T2 DM with HDL.
文摘Cymbopogon citratus(lemon grass)is commonly used in traditional folk medicine.The essential oil extracted from C.citratus has been reported as a potential anti-oxidant and anti-inflammatory agent.This study has been designed to explore the protective effect of C.citratus(lemon grass)against modified LDL(OxLDL and H2O2 LDL)induced cytotoxicity in Peripheral Blood Mononuclear Cells(PBMC).The essential oil extracted from C.citratus(EOC)was subjected to FT-IR spectroscopic analysis for the identification of functional groups.In vitro antioxidant assays were carried out to assess the electron donating capability of EOC as compared with a known standard L-ascorbic acid.The cytoprotective effects of EOC were determined in PBMC induced with modified LDL.Spectra obtained from FT-IR analysis showed the presence of functional groups in EOC such as H-bonded,O-H stretching,N-H stretching,aldehyde-C-H stretching,aldehyde/ketone-C=O stretching,-C=C-stretching,-CH_(3) bending,-C-H in plane bending.EOC has greater antioxidant property when compared with the standard L-ascorbic acid.EOC at all test concentrations demonstrated free radical scavenging activity and cytoprotective effect when challenged against modified LDL in PBMC.The above results show EOC as a promising antioxidant and cytoprotective agent.
文摘1 INTRODUCTION It’s evident that high level of cholesterol in blood is associated with the formation and devel-opment of familial hypercholestrolemia(FH)and atherosclerosis(AS).In general,choles-terol in blood is mainly combined with low-density lipoproteins(LDL),very low-densitylipoproteins(VLDL)and high density lipoproteins(HDL).About 60%-80% cholesterolexists in LDL and VLDL.LDL and VLDL have been recognized as the principal
文摘AIM:To evaluate the direct binding of two main chlamydial biovars(C.trachomatis and C.pneumoniae) to plasma lipoproteins and its effect on chlamydial infection rate in human hepatoma cell line(HepG2 cells). METHODS:Murine plasma lipoproteins were fractionated and isolated using fast-performance liquid chromatography(FPLC),spotted on nitrocellulose membrane and incubated with chlamydial suspensions. Direct binding of chlamydial particles to lipoprotein fractions has been studied using lipopolysaccharide-specific antibodies in immuno-dot blot binding assay and immunoprecipitation analysis.Immunostaining protocol as well as flow cytometry analysis have been employed to study the infectivity rate of chlamydial species in HepG2 cells. RESULTS:Elementary bodies of both C.trachomatis and C.pneumoniae bind ApoB-containing fractions of plasma lipoproteins.That binding becomes stronger when heat-denatured FPLC fractions are used, suggesting a primary role of apolipoproteins in interaction between chlamydial particle and lipoprotein. Both chlamydial biovars efficiently propagate in human hepatoma cell line-HepG2 cells even in serum free conditions forming late-stage inclusion bodies and releasing extracellular elementary bodies.Preincubation of C.trachomatis and C.pneumoniae with native ApoB-containing lipoproteins enhances the rate of chlamydial infection in HepG2 cells.CONCLUSION:A productive infection caused by C. trachomatis and C.pneumoniae may take place in human-derived hepatocytes revealing hepatic cells as possible target in chlamydial infection.Obtained results may suggest the participation of lipoprotein receptors in the mechanism of attachment and/or entry of chlamydial particles into target cells.
文摘Objective To study the releases of endothelin-1 and prostacyclin by endothelial cells in culture and to elucidate how these releases were influenced by smoke-treated low density lipoprotein. Methods We exposed en- dothelial cell cultures to native or oxidized low density lipoproteins,low density lipoproteins treated by dimethylsul- foxide-soluble particles from cigarette smoke or dimethylsulfoxide alones. The release of endothelin-1 was assayed by bioassay and the release of prostacyclin was assayed by radioimmunoassay. Results Low density lipoproteins treated by smoke significantly increased the release or endothelin-1 (P<0.025) and decreased the release of prostacyclin (P< 0.02) by endothelial cells in culture, contrast to native or dimethylsulfoxide-treated lipoproteins. Conclusion The main part or vasoconstrictor activity in conditioned medium from bovine aortic EC is endothelin-1.
文摘Background. The effects of physical exercises combined with a low-calorie diet on weight loss, body composition, lipoproteins profile, and physical fitness had been well described. However, Central Africa’s studies investigating these kinds of diets and exercise regimens are lacking. Objective. To investigate the effects of adding 14-weeks exercises to a hypocaloric diet on changes in body composition, lipoproteins concentrations, and physical capacities in obese Congolese women. Population and Methods. In total, 34 obese women aged 30 - 39 years (mean age: 33.7 ± 2.4 years) assigned to 14-weeks training program and low energy ketogenic diet. Body composition was assessed using classic methods and impedancemetry. Fasting plasma glucose (FPG) and fasting serum insulin were assessing using enzymatic colorimetric and radioim-munoradiometric methods. HOMA-IR and lipoproteins concentrations were assessed using standardized laboratory methods. VO2peak was measured on a treadmill during a progressive exercise test. Speed, cadence and stride length were measured along the 10-m level walkway. Muscular endurance was measured using the tests of sit-up and inflections-extensions of elbows. All the variables of the study were assessed at the beginning, in the 7-weeks, and in the 14-weeks of training methods. Results. Declines in body weight (16%), percent fat (12.1%), fat weight (26.4%), abdominal fat (34.2%), and waist circumference (10.4%) were found. A significant decrease in FPG (13%), fasting serum insulin (60.9%), HOMA-IR (64.7%), total cholesterol (12.2%), LDL-cholesterol (20.3%), triglycerides (92.8%), and VLDL-triglycerides (17.5%) was shown. In contrast, significant increase in HDL-cholesterol (27.13%) was found. The peak oxygen consumption VO2peak relative to body weight improved more in the 14-weeks training program (13.4%). Obese women exhibited higher values in the 14-weeks training program for speed gait (16.5%), cadence (9.1%), and stride length (15.7%) during normal walk and rapid walk. Weight loss combined with a low-calorie diet and 14-weeks training program improved significantly muscular endurance capacities. Conclusion. Exercise added to hypocaloric diet leads to decreases in body composition, to improve in insulin sensitivity, to enhancement of VO2peak and functional fitness. This may be helpful for the treatment of the metabolic complications of abdominal obesity.
基金supported by Grants-in-Aid from the National Natural Science Research Foundation of China,No.30670517,10632010
文摘Object To elucidate the physiological significance of the spiral flow in the arterial system from the viewpoint of atherogenic lipid transport,an ex vivo experimental comparative
文摘Emerging data now indicate and address the strong relationship between H. pylori infection and the incidence of Type 2 DM, a growing body of evidence suggests that the infection with H. pylori may be associated with insulin resistance, chronic inflammation, long-term diabetes complications, and cardiovascular risk factors. The present study was conducted to evaluate the relationship between the infection with Helicobacter pylori and disturbance in Lipid profile in Type 2 Diabetic patients. One hundred and five participants were enrolled, categorized into two groups of H. pylori positive cases and negative controls according to their results of H. pylori IgG antibodies. Subjects in both groups fill the structured questionnaire. Blood samples were drawn for measuring the FBS, 2hr-PP blood sugar, HbA1c, Lipid profile and oxidized LDL. The obtained results were statistically analyzed. The study methodology was approved by the Biomedical Ethics Committee in the Faculty of Medicine, Umm Al-Qura University, Makkah, KSA. 48 cases (45.7%) were diagnosed as H. pylori seropositive and 57 (54.3%) were negative. There is no significant difference in the mean age or mean BMI between the H. pylori negative and positive cases. Glycemic control was similar in the two groups. Total Cholesterol was higher in cases of positive H. pylori compared to negative controls (P < 0.001) and Triglycerides was significantly elevated too (P < 0.005). No significant difference in the levels of HDL-Cholesterol between the two groups, while the mean LDL-Cholesterol was found to be significantly increased in cases of H. pylori positive compared to negative controls (P < 0.001). Oxidized LDL levels in the positive cases was found to be increased significantly (P = 0.001) compared to negative controls. Infection with H. pylori is associated with increased levels of Total Cholesterol, Triglycerides, LDL-C and oxidized LDL in Type 2 Diabetic patients.
文摘 Rheological effects of acute and chronic HELP - treatment
The acute reduction of rheologically relevant plasma constituents such as fibrinogen and largesized lipoproteins significantly improves whole blood and plasma viscosity by a decrease of approximately 15%, erythrocyte aggregability decreases by 53% whereas erythrocyte filtrability improves by 10% (figure 3).……
