scholarly journals Effect of Neomycin and Other Antibiotics on Serum Cholesterol Levels and on 7α-Dehydroxylation of Bile Acids by the Fecal Bacterial Flora in Man

1973 ◽  
Vol 33 (4) ◽  
pp. 393-402 ◽  
Author(s):  
PAUL SAMUEL ◽  
CHARLES M. HOLTZMAN ◽  
EDWARD MEILMAN ◽  
IGNACY SEKOWSKI
Keyword(s):  
Bile Acids ◽  
Serum Cholesterol ◽  
Bacterial Flora ◽  
Cholesterol Levels

Relation of Serum Cholesterol to in vitro 7α-Dehydroxylation of Primary Bile Acids by Fecal Bacteria in Infants and Children

PEDIATRICS ◽  
1974 ◽  
Vol 54 (2) ◽  
pp. 222-228
Author(s):  
Paul Samuel ◽  
Arnold Schussheim ◽  
Sidney Lieberman ◽  
Eugene C. Don
Keyword(s):  
Bile Acids ◽  
Serum Cholesterol ◽  
Bacterial Flora ◽  
Progressive Increase ◽  
Infants And Children ◽  
Cholesterol Levels ◽  
Degrading Bacteria ◽  
Fresh Feces ◽  
Low Levels

Fresh feces from 104 infants and children (aged 3 days to 16 years) were homogenized and incubated with labeled cholic or chenodeoxycholic acid. After 2 and/or 24 hours' incubation, the percentage of converted (mostly 7α-dehydroxylated) primary bile acids was measured, and the degree of conversion was correlated with serum cholesterol levels. It was found that stool homogenates of patients with low levels of serum cholesterol (< 160 mg/100 ml) converted labeled primary bile acids poorly or not at all, whereas in patients with higher serum cholesterol levels (> l60 mg/100 ml) the conversion process was markedly increased. Thus, highly significant correlations were found between serum cholesterol levels and the capability of the fecal bacterial flora to convert both primary bile acids "in vitro." The possibility is proposed that in man the relatively rapid progressive increase of serum cholesterol level following birth may be related to the colonization of the intestinal tract by 7α-dehydroxylating and/or bile acid degrading bacteria. It is suggested that the prevalence of these bacteria is subject to environmental effects, and it may be one of the important factors regulating cholesterol levels in man.

scholarly journals Vitamin C status, serum cholesterol levels and bile composition in the pregnant guinea-pig

1980 ◽  
Vol 43 (1) ◽  
pp. 95-100 ◽  
Author(s):  
S. A. Jenkins
Keyword(s):  
Ascorbic Acid ◽  
Body Weight ◽  
Gall Bladder ◽  
Guinea Pig ◽  
Bile Acids ◽  
Serum Cholesterol ◽  
Guinea Pigs ◽  
Cholesterol Content ◽  
Biliary Secretion ◽  
Cholesterol Levels

1. Pregnant guinea-pigs receiving a low dose of L-ascorbic acid (0.2 mg/100 g body-weight per d) developed a hypercholesterolaemia in the third trimester of pregnancy, whereas no change in serum cholesterol levels was observed in pregnant animals receiving a higher dose of the vitamin (2 mg/100 g body-weight per d).2. Pregnancy in the group of guinea-pigs receiving the higher dose of L-ascorbic acid was associated with an increased biliary secretion of bile acids. No change was observed in the biliary secretion of bile acids in pregnant animals receiving the lower dose of L-ascorbic acid, but these animals secreted significantly more cholesterol.3. Changes in the biliary secretion of cholesterol and bile acids in the pregnant guinea-pig according to L-ascorbic acid intake were reflected in the composition of the gall-bladder bile. Thus, the gall-bladder bile of guinea-pigs receiving the lower dose of L-ascorbic acid contained more cholesterol, while the gall-bladder bile of those animals receiving the higher dose of the vitamin had a higher content of bile acids.4. The increased cholesterol content of the gall-bladder of pregnant guinea-pigs receiving the lower dose of L-ascorbic acid resulted in decreased bile acid:cholesterol and phospholipid: cholesterol values, conditions predisposing to cholelithiasis.

scholarly journals Sleep Disturbance Induces Increased Cholesterol Level by NR1D1 Mediated CYP7A1 Inhibition

2020 ◽  
Vol 11 ◽  
Author(s):  
Chen Xing ◽  
Xin Huang ◽  
Yifan Zhang ◽  
Chongchong Zhang ◽  
Wei Wang ◽  
...  
Keyword(s):  
Circadian Clock ◽  
Sleep Disturbance ◽  
Bile Acids ◽  
Serum Cholesterol ◽  
Warning Signs ◽  
Liver Cholesterol ◽  
Cholesterol Accumulation ◽  
Expression Levels ◽  
Cholesterol Levels ◽  
Increased Risk

Disturbed sleep is closely associated with an increased risk of metabolic diseases. However, the underlying mechanisms of circadian clock genes linking sleep and lipid profile abnormalities have not been fully elucidated. This study aimed to explore the important role of the circadian clock in regulating impaired cholesterol metabolism at an early stage of sleep deprivation (SD). Sleep disturbance was conducted using an SD instrument. Our results showed that SD increased the serum cholesterol levels. Concentrations of serum leptin and resistin were much lower after SD, but other metabolic hormone concentrations (adiponectin, glucagon, insulin, thyroxine, norepinephrine, and epinephrine) were unchanged before and after SD. Warning signs of cardiovascular diseases [decreased high density lipoprotein (HDL)-cholesterol and increased corticosterone and 8-hydroxyguanosine levels] and hepatic cholestasis (elevated total bile acids and bilirubin levels) were observed after SD. Cholesterol accumulation was also observed in the liver after SD. The expression levels of HMGCR, the critical enzyme for cholesterol synthesis, remained unchanged in the liver. However, the expression levels of liver CYP7A1, the enzyme responsible for the conversion of cholesterol into bile acids, significantly reduced after SD. Furthermore, expression of NR1D1, a circadian oscillator and transcriptional regulator of CYP7A1, strikingly decreased after SD. Moreover, NR1D1 deficiency decreased liver CYP7A1 levels, and SD could exacerbate the reduction of CYP7A1 expression in NR1D1−/− mouse livers. Additionally, NR1D1 deficiency could further increase serum cholesterol levels under SD. These results suggest that sleep disturbance can induce increased serum cholesterol levels and liver cholesterol accumulation by NR1D1 mediated CYP7A1 inhibition.

scholarly journals High serum cholesterol levels in persons with 'high-normal' TSH levels: should one extend the definition of subclinical hypothyroidism?

1998 ◽  
pp. 141-145 ◽  
Author(s):  
G Michalopoulou ◽  
M Alevizaki ◽  
G Piperingos ◽  
D Mitsibounas ◽  
E Mantzos ◽  
...  
Keyword(s):  
Total Cholesterol ◽  
Serum Cholesterol ◽  
Subclinical Hypothyroidism ◽  
Low Density Lipoprotein ◽  
Density Lipoprotein ◽  
High Serum ◽  
High Serum Cholesterol ◽  
Cholesterol Levels ◽  
Group D ◽  
Tsh Levels

OBJECTIVE: The association between established hypothyroidism and high cholesterol levels is well known. The aim of the present study was to investigate the effect of thyroxine (T4) administration on cholesterol levels in hypercholesterolemic subjects with TSH levels within the normal range ('high-normal' TSH compared with 'low-normal' TSH). DESIGN AND METHODS: We determined TSH levels in 110 consecutive patients referred for hypercholesterolemia (serum cholesterol >7.5 mmol/l). Those with 'high-normal' TSH (2.0-4.0 microU/ml) as well as those with 'low-normal' TSH (0.40-1.99 microU/ml) were randomly assigned to receive either 25 or 50 microg T4 daily for two months. Thus, groups A and B (low-normal TSH) received 25 and 50 microg T4 respectively and groups C and D (high-normal TSH) received 25 and 50 microg T4 respectively. Serum T4, tri-iodothyronine (T3), TSH, free thyroxine index, resin T3 uptake and thyroid autoantibodies (ThAab) as well as total cholesterol, high and low density lipoprotein cholesterol (HDL, LDL), and triglycerides were determined before and at the end of the two-month treatment period. RESULTS: TSH levels were reduced in all groups. The most striking effect was observed in group D (TSH levels before: 2.77+/-0.55, after: 1.41+/-0.85 microU/ml, P < 0.01). Subjects in groups C and D had a higher probability of having positive ThAabs. A significant reduction in total cholesterol (P < 0.01) and LDL (P < 0.01) was observed after treatment only in group D. In those subjects in group D who were ThAab negative, there was no significant effect of thyroxine on cholesterol levels. CONCLUSIONS: Subjects with high-normal TSH levels combined with ThAabs may, in fact, have subclinical hypothyroidism presenting with elevated cholesterol levels. It is possible that these patients might benefit from thyroxine administration.

Longitudinal associations between serum cholesterol levels and suicidal ideation in an older Korean population

2014 ◽  
Vol 152-154 ◽  
pp. 517-521 ◽  
Author(s):  
Jae-Min Kim ◽  
Robert Stewart ◽  
Hee-Ju Kang ◽  
Bo-ok Jeong ◽  
Seon-Young Kim ◽  
...  
Keyword(s):  
Suicidal Ideation ◽  
Serum Cholesterol ◽  
Korean Population ◽  
Cholesterol Levels ◽  
Longitudinal Associations
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