High plasma cholesterol, but low triglycerides and plaque-free arteries, in Mexican free-tailed bats

1996 ◽  
Vol 271 (5) ◽  
pp. R1101-R1106 ◽  
Author(s):  
E. P. Widmaier ◽  
E. R. Gornstein ◽  
J. L. Hennessey ◽  
J. M. Bloss ◽  
J. A. Greenberg ◽  
...  
Keyword(s):  
Plasma Cholesterol ◽  
Low Density Lipoprotein ◽  
Plasma Lipid ◽  
Density Lipoprotein ◽  
Hdl Cholesterol ◽  
Late Pregnancy ◽  
High Plasma ◽  
High Fat ◽  
Tadarida Brasiliensis ◽  
Cholesterol Levels

Female mammals typically become hyperphagic from mid- to late pregnancy and during lactation. Mexican free-tailed bats, Tadarida brasiliensis mexicana, double their nightly food intake from late pregnancy to peak lactation and consume an insect diet that is exceptionally high in fat. During late pregnancy and throughout lactation, fasting plasma levels of cholesterol in this insectivorous bat are high (215 +/- 8 mg/dl) and are nearly 10-fold higher than in three species of Old World frugivorous bats. Fasting triglycerides were unexpectedly low in T. brasiliensis (25 +/- 2 mg/dl), despite evidence of high fat intake during nightly feeding bouts (postprandial cholesterol and triglycerides, 268 +/- 18 and 122 +/- 20 mg/dl, respectively). High-density lipoprotein (HDL) cholesterol levels were extraordinarily high (124 +/- 5 mg/dl) and unaffected by feeding. Low-density lipoprotein cholesterol levels were correspondingly low (86 +/- 7 mg/dl). This unusual plasma lipid profile was not associated with coronary or aortic atherosclerosis, nor was there evidence of hyperglycemia or hyperinsulinemia. A high-fat diet and high levels of cholesterol in T. brasiliensis are not correlated with cardiovascular disease or (possibly) insulin resistance. Among several possible factors that might account for these observations, nightly bouts of powered flight (commuting and foraging for food) may contribute to elevated HDL cholesterol, which may protect this species from developing atherosclerosis.

Plasma Lipid and Lipoprotein Abnormalities in Patients with Malabsorption

1973 ◽  
Vol 45 (5) ◽  
pp. 583-592 ◽  
Author(s):  
Gilbert R. Thompson ◽  
J. Paul Miller
Keyword(s):  
Plasma Lipids ◽  
Plasma Cholesterol ◽  
Low Density Lipoprotein ◽  
Plasma Lipid ◽  
Density Lipoprotein ◽  
Serum Triglyceride ◽  
Plasma Lipoproteins ◽  
Low Density ◽  
Cholesterol Levels ◽  
Lipids And Lipoproteins

1. Plasma lipids and lipoproteins have been studied in control subjects and patients with various types of steatorrhoea. 2. Low plasma cholesterol levels were found in malabsorbers and were associated with decreased amounts of low-density lipoprotein (LDL) in males and high-density lipoprotein (HDL) in females. 3. Serum triglyceride levels were normal in males, but exceeded control values in some of the females, due to an increase in very-low-density lipoprotein. 4. LDL composition was abnormal in both male and female malabsorbers, with a decreased proportion of cholesterol ester and an increased proportion of triglyceride. There was also an increased proportion of triglyceride in HDL. 5. These findings show that malabsorption markedly influences not only the concentration but also the composition of plasma lipoproteins.

scholarly journals Membrane type 1 matrix metalloproteinase promotes LDL receptor shedding and accelerates the development of atherosclerosis

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Adekunle Alabi ◽  
Xiao-Dan Xia ◽  
Hong-Mei Gu ◽  
Faqi Wang ◽  
Shi-Jun Deng ◽  
...  
Keyword(s):  
Matrix Metalloproteinase ◽  
Plasma Cholesterol ◽  
Low Density Lipoprotein ◽  
Ldl Receptor ◽  
Density Lipoprotein ◽  
High Plasma ◽  
Extracellular Milieu ◽  
Cholesterol Levels ◽  
Membrane Type

AbstractPlasma low-density lipoprotein (LDL) is primarily cleared by LDL receptor (LDLR). LDLR can be proteolytically cleaved to release its soluble ectodomain (sLDLR) into extracellular milieu. However, the proteinase responsible for LDLR cleavage is unknown. Here we report that membrane type 1-matrix metalloproteinase (MT1-MMP) co-immunoprecipitates and co-localizes with LDLR and promotes LDLR cleavage. Plasma sLDLR and cholesterol levels are reduced while hepatic LDLR is increased in mice lacking hepatic MT1-MMP. Opposite effects are observed when MT1-MMP is overexpressed. MT1-MMP overexpression significantly increases atherosclerotic lesions, while MT1-MMP knockdown significantly reduces cholesteryl ester accumulation in the aortas of apolipoprotein E (apoE) knockout mice. Furthermore, sLDLR is associated with apoB and apoE-containing lipoproteins in mouse and human plasma. Plasma levels of sLDLR are significantly increased in subjects with high plasma LDL cholesterol levels. Thus, we demonstrate that MT1-MMP promotes ectodomain shedding of hepatic LDLR, thereby regulating plasma cholesterol levels and the development of atherosclerosis.

Bile Acids: The Good, the Bad, and the Ugly

Physiology ◽  
1999 ◽  
Vol 14 (1) ◽  
pp. 24-29 ◽  
Author(s):  
Alan F. Hofmann
Keyword(s):  
Bile Acids ◽  
Enterohepatic Circulation ◽  
Cholesterol Metabolism ◽  
Plasma Cholesterol ◽  
Low Density Lipoprotein ◽  
Density Lipoprotein ◽  
Lipid Absorption ◽  
Bile Acid Metabolism ◽  
Cholesterol Levels ◽  
Density Lipoprotein Receptor

Bile acids, amphipathic end products of cholesterol metabolism, are “good” in the infant because they enhance lipid absorption and thereby promote growth. Bile acids also induce bile flow and biliary lipid secretion. The enterohepatic circulation of bile acids is “bad” in the adult because it downregulates hepatocyte low-density lipoprotein receptor activity and thereby elevates plasma cholesterol levels. Defects in bile acid metabolism such as impaired biosynthesis or transport are “ugly” because they cause morbidity and death. New approaches for treating these defects are being developed.

scholarly journals ANALISIS HUBUNGAN KADAR GULA DARAH PUASA DENGAN KADAR KOLESTEROL HIGH DENSITY LIPOPROTEIN (HDL) PADA PASIEN DIABETES MELLITUS TIPE 2 DI RSUP SANGLAH

2016 ◽  
Vol 4 (2) ◽  
Author(s):  
Nyoman Jirna
Keyword(s):  
Blood Sugar ◽  
Low Density Lipoprotein ◽  
Density Lipoprotein ◽  
Hdl Cholesterol ◽  
Fasting Blood Sugar ◽  
Cholesterol Levels ◽  
Sugar Levels ◽  
Dm Type 2 ◽  
The Relationship

Abstract Diabetes mellitus (DM) is a group of metabolic diseases with characteristic hyperglycemia that happen by abnormal secretions of insulin, insulin action, or both. The condition of insulin resistance in DM type 2 cause abnormal lipid metabolism that indicated by increase or decrease levels of lipid fraction in plasma, include increase levels of Very Low Density Lipoprotein (VLDL) or triglycerides, decrease levels of High Density Lipoprotein (HDL), and formed small dense Low Density Lipoprotein (LDL). The purpose of this study is to determine the relationship between the fasting blood sugar levels with HDL cholesterol levels in patients with DM type 2. The method use an analytical study with cross sectional design. Sampling examined as many as 35 samples by purposive sampling. The relationship between fasting blood sugar levels with HDL cholesterol levels is analyzed by Pearson Product Moment Correlation test. Based on the result concluded that there is a relationship between fasting blood sugar levels with HDL cholesterol levels in patients with DM type 2 in RSUP Sanglah with significant value sig=0,030 (sig

Dyslipidaemia

2019 ◽  
pp. 33-48
Author(s):  
Heinz Drexel
Keyword(s):  
Cardiovascular Disease ◽  
Randomized Clinical Trials ◽  
Ldl Cholesterol ◽  
Low Density Lipoprotein ◽  
Density Lipoprotein ◽  
Hdl Cholesterol ◽  
Epidemiological Studies ◽  
Residual Risk ◽  
Atherosclerotic Cardiovascular Disease ◽  
Cholesterol Levels

Lipid metabolism has gained cardiological interest only after statins were demonstrated to reduce cardiovascular disease in secondary and primary prevention. Therefore, this chapter first introduces the physiological and atherogenic properties of lipoproteins, before focusing on interventions. Both the efficacy and safety of statins have been proven in numerous randomized clinical trials. Because there is a considerable residual risk in statin-treated patients, additional approaches have been investigated. The focus is now on further reductions in low-density lipoprotein (LDL) cholesterol levels. First, high-intensity statin regimens were shown to reduce residual risk. Subsequently, ezetimibe was demonstrated, for the first time, to have a beneficial effect as a non-statin lipid intervention. More recently, inhibitors of the enzyme PCSK9 have demonstrated a very high efficacy in reducing LDL cholesterol levels. Although the causality of LDL for atherosclerotic cardiovascular disease has been proven in epidemiological studies, including Mendelian randomization studies, as well as interventional trials, adherence to statins and other therapies is far from optimal. In contrast, interventions to increase high-density lipoprotein (HDL) cholesterol levels could not proven to have further benefits when combined with statins.

Absence of focal glomerulosclerosis in aging analbuminemic rats

1992 ◽  
Vol 262 (6) ◽  
pp. R947-R954 ◽  
Author(s):  
C. K. Fujihara ◽  
D. M. Limongi ◽  
H. C. De Oliveira ◽  
R. Zatz
Keyword(s):  
Plasma Cholesterol ◽  
Low Density Lipoprotein ◽  
Plasma Lipid ◽  
Density Lipoprotein ◽  
Wall Stress ◽  
Plasma Triglyceride ◽  
Sprague Dawley ◽  
Platelet Aggregability ◽  
Sd Rats ◽  
Glomerular Hypertension

The Nagase analbuminemic rat (NAR), a mutant of the Sprague-Dawley (SD) strain, exhibits high levels of plasma cholesterol (Chol), thrombocytosis, and enhanced platelet aggregability, which might promote glomerulosclerosis (GS). To determine whether NAR are more susceptible than SD rats to aging GS, young (3-mo-old) and aging (18-mo-old) SD rats and NAR were studied. In young NAR, glomerular pressure and glomerular volume were lower, whereas total and high-density lipoprotein plasma Chol levels were higher than in young SD rats. Aging SD rats developed glomerular hypertension and hypertrophy. Less glomerular enlargement and subnormal glomerular pressures were seen in aging NAR. Enhanced platelet aggregation developed in aging SD rats, approaching the values seen in NAR. Similarly elevated levels of low-density lipoprotein Chol were seen in additional SD rats and NAR studied at 12 mo of age. Plasma triglyceride (TG) levels were lower in NAR at this age. Only SD rats developed proteinuria and exhibited GS and glomerular lipid deposits at 18 mo of age. Reduced glomerular wall stress due to lower glomerular pressure and volume as well as lower TG levels may explain the absence of GS in aging NAR despite plasma lipid and platelet abnormalities.

scholarly journals Melatonin Improves Fatty Liver Syndrome by Inhibiting the Lipogenesis Pathway in Hamsters with High-Fat Diet-Induced Hyperlipidemia

Nutrients ◽  
2019 ◽  
Vol 11 (4) ◽  
pp. 748 ◽  
Author(s):  
Tzu-Hsuan Ou ◽  
Yu-Tang Tung ◽  
Ting-Hsuan Yang ◽  
Yi-Wen Chien
Keyword(s):  
High Fat Diet ◽  
Fatty Acid Synthase ◽  
Plasma Cholesterol ◽  
Low Density Lipoprotein ◽  
Density Lipoprotein ◽  
Lipoprotein Cholesterol ◽  
Lipogenic Enzymes ◽  
High Fat ◽  
Syrian Hamsters ◽  
Hepatic Lipid

The aim of this study was to investigate the effect of melatonin on hepatic lipid metabolism in hamsters with high-fat diet (HFD)-induced dyslipidemia. Male Syrian hamsters were kept on either a chow control (C) or HFD for four weeks. After four weeks, animals fed the HFD were further randomly assigned to four groups: high-fat only (P), melatonin low-dosage (L), medium-dosage (M), and high-dosage (H) groups. The L, M, and H groups, respectively, received 10, 20, and 50 mg/kg/day of a melatonin solution, while the P and C groups received the ethanol vehicle. After eight weeks of the intervention, results showed that a low dose of melatonin significantly reduced HFD-induced hepatic cholesterol and triglycerides; decreased plasma cholesterol, triglycerides, and low-density lipoprotein cholesterol; and increased plasma high-density lipoprotein cholesterol (p < 0.05). In addition, melatonin markedly decreased activities of the hepatic lipogenic enzymes, acetyl-CoA carboxylase (ACC) and fatty acid synthase (FAS) (p < 0.05), and elevated the relative hepatic carnitine palmitoyltransferase-1α expression in hamsters with HFD-induced hyperlipidemia. Consequently, melatonin reduced activities of the hepatic lipogenic enzymes, ACC and FAS. In summary, chronic melatonin administration improved HFD-induced dyslipidemia and hepatic lipid accumulation in Syrian hamsters with HFD-induced dyslipidemia, which might have occurred through inhibiting the lipogenesis pathway.

Paradoxical Hypercholesterolemia in an Otherwise Healthy Adult Man

2019 ◽  
Author(s):  
Peter A Mcpherson
Keyword(s):  
Cholesterol Level ◽  
Total Cholesterol Level ◽  
Low Density Lipoprotein ◽  
Density Lipoprotein ◽  
Hdl Cholesterol ◽  
Red Yeast Rice ◽  
Transfer Protein ◽  
Cholesterol Levels ◽  
Red Yeast ◽  
High High Density Lipoprotein

AbstractHypercholesterolemia is characterized by serum cholesterol levels greater than 5 mmol per L. However, the distribution of cholesterol among lipoprotein classes has a significant bearing on diagnosis: high–low-density lipoprotein (LDL) cholesterol suggests familial hypercholesterolemia, whereas high–high-density lipoprotein (HDL) cholesterol is associated with hyperalphalipoproteinemia. On routine screening, a 23-year-old man presented with a total cholesterol level of 7.6 mmol per L but was subsequently found to have an HDL cholesterol level of 5.6 mmol per L. The clinical picture was confounded by his use of red yeast rice extract, a popular health supplement with hypolipidemic effects. In this case individual, the use of red yeast rice extract caused a hyperlipidemic state, ostensibly through downregulation of cholesteryl ester transfer protein. This case emphasizes the extended role of laboratory medicine in complex cases of hyperlipidemia.

Association of osteocalcin, insulin resistance and oxidative stress during noncomplicated pregnancy

2016 ◽  
Vol 40 (4) ◽  
Author(s):  
Marina Pijanović ◽  
Aleksandra Stefanović ◽  
Milica Miljković ◽  
Snežana Marić-Krejović ◽  
Slavica Spasić
Keyword(s):  
Repeated Measures ◽  
Low Density Lipoprotein ◽  
Density Lipoprotein ◽  
Hdl Cholesterol ◽  
Late Pregnancy ◽  
Progressive Increase ◽  
Oxidative Status ◽  
Insulin Resistant ◽  
Uncomplicated Pregnancy ◽  
Lipid Status

AbstractBackground:The aim of this study was to explore longitudinal changes of serum osteocalcin during normal, uncomplicated pregnancy and after delivery, and its correlations with parameters of glucose homeostasis, lipid status, and oxidative status in late pregnancy.Methods:Osteocalcin, glucose, insulin, lipid status parameters, total oxidative status (TOS), and total antioxidant capacity (TAC) were measured in sera of 38 healthy pregnant women. The sera were collected at the midpoint of the 1Results:Repeated measures analysis of variance showed a progressive increase in total cholesterol, triglycerides, and low density lipoprotein (LDL)-cholesterol, with a postpartum decrease. High density lipoprotein (HDL)-cholesterol increased in the 2Conclusions:We observed the changes in pregnancy that may lead towards atherogenic, prooxidant and insulin resistant state, which are possibly counterbalanced by various protective systems, one of which might be osteocalcin.

scholarly journals The effect of daily baked bean (Phaseolus vulgaris) consumption on the plasma lipid levels of young, normo-cholesterolaemic men

1989 ◽  
Vol 61 (2) ◽  
pp. 257-265 ◽  
Author(s):  
Susan M. Shutler ◽  
Gemma M. Bircher ◽  
Jacki A. Tredger ◽  
Linda M. Morgan ◽  
Ann F. Walker ◽  
...  
Keyword(s):  
Phaseolus Vulgaris ◽  
Plasma Cholesterol ◽  
Plasma Lipid ◽  
Density Lipoprotein ◽  
Hdl Cholesterol ◽  
Normal Diet ◽  
Male Students ◽  
C Peptide ◽  
Tomato Sauce ◽  
Cholesterol Ratio

1. Thirteen normo-cholesterolaemic male students consumed one 450 g can of baked beans (Phaseolus vulgaris) in tomato sauce, daily, for 14 d as part of their normal diet. After a 14 d washout period, eleven of the students went on to consume one 440 g can of spaghetti in tomato sauce, daily, for 14 d.2. Fasting blood samples were taken frequently for measurement of plasma cholesterol, high-density lipoprotein (HDL)-cholesterol, triacylglycerols, glucose, insulin and C-peptide. Diet diaries (3 d) were completed by the subjects during each period.3. Consumption of beans and spaghetti led to a significant reduction in the amount of fat eaten daily (P< 0.05). Bean consumption also resulted in significant increases in protein, fibre and sugar intakes (P< 0.02,P< 0.001 andP< 0.05 respectively).4. During the bean-eating period the mean total plasma cholesterol level of the students fell significantly from 5.1 to 4.5 mmol/l (P< 0.02). No reduction in plasma cholesterol occurred during the spaghetti-eating period.5. HDL-cholesterol levels fell significantly during both periods (P< 0.001), but HDL:total cholesterol ratio was significantly reduced only during the spaghetti-eating period (P< 0.001). Neither beans nor spaghetti affected triacylglycerol, insulin or C-peptide levels.6. The benefits of a legume-rich diet are discussed.

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