Causes of high LDL cholesterol

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Genetic Causes of High LDL Cholesterol

A major cause of high LDL cholesterol is genetic, particularly familial hypercholesterolemia (FH). FH is most often due to mutations in the LDL receptor (LDLR) gene, which impairs the body's ability to clear LDL cholesterol from the blood. Other less common genetic mutations affecting proteins like APOB and PCSK9 can also lead to high LDL cholesterol. These genetic factors result in lifelong elevated LDL levels and a higher risk of cardiovascular disease, often without symptoms for many years González-Lleo2022Defesche2017Bianconi2020.

Lifestyle and Environmental Factors

High LDL cholesterol can also be caused by lifestyle choices and environmental factors. Diets high in saturated fats and sugars, sedentary behavior, and obesity are significant contributors. These factors can increase the amount of cholesterol in the blood and reduce the body's ability to clear LDL cholesterol efficiently. Age and sex also play a role, with LDL levels tending to rise as people get older .

Metabolic and Health-Related Contributors

Certain health conditions and metabolic factors can increase LDL cholesterol. Elevated serum uric acid (SUA) has been shown to independently raise the risk of developing high LDL cholesterol and hypertriglyceridemia. Higher body mass index (BMI) and changes in kidney function (as measured by eGFR) are also associated with increased LDL cholesterol . Diabetes and insulin resistance can further disrupt lipid metabolism, contributing to higher LDL levels, especially when combined with genetic predispositions González-Lleo2022Choy2005.

Molecular and Cellular Mechanisms

LDL cholesterol is normally cleared from the bloodstream by LDL receptors on liver cells. When these receptors are defective or reduced in number—due to genetic mutations or increased activity of the PCSK9 enzyme—LDL clearance is impaired, leading to higher circulating LDL levels. PCSK9 binds to LDL receptors and promotes their degradation, reducing the body's ability to remove LDL cholesterol. Increased PCSK9 activity, whether genetic or acquired, is a significant cause of high LDL cholesterol Klein-Szanto2019Defesche2017.

Conclusion

High LDL cholesterol is caused by a combination of genetic factors (such as familial hypercholesterolemia and mutations in LDLR, APOB, or PCSK9), lifestyle choices (diet, physical inactivity), metabolic conditions (obesity, diabetes, high uric acid), and molecular mechanisms that impair LDL clearance. Understanding these causes is essential for effective prevention and treatment of high LDL cholesterol and its associated cardiovascular risks Klein-Szanto2019Kuwabara2018González-Lleo2022+3 MORE.

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Most relevant research papers on this topic

Keep recycling going: New approaches to reduce LDL-C.

Combining PCSK-9 inhibitors with statins can effectively reduce LDL levels and prevent atherosclerosis, but millions of patients have statin intolerance or cannot effectively control their cholesterol levels with statins alone.

2019·

40citations

·Andres J Klein-Szanto et al.

Biochemical pharmacology·

DOI

Elevated serum uric acid increases risks for developing high LDL cholesterol and hypertriglyceridemia: A five-year cohort study in Japan.

Elevated serum uric acid increases the risk for developing high LDL cholesterol and hypertriglyceridemia, potentially shedding light on its role in cardiovascular disease.

Observational StudyRigorous JournalHighly Cited

2018·

144citations

·M. Kuwabara et al.

International journal of cardiology·

DOI

Diabetes and Familial Hypercholesterolemia: Interplay between Lipid and Glucose Metabolism

People with familial hypercholesterolemia may be protected from developing diabetes, but cholesterol-lowering treatments like statins may increase the risk of the disease.

Literature ReviewVery Rigorous Journal

2022·

23citations

·Ana M. González-Lleo et al.

Nutrients·

DOI

Lipids and atherosclerosis.

High serum lipid levels, especially elevated LDL, are strongly related to atherosclerosis, and medications like statins and ezetimibe can help control cholesterol production and prevent atherosclerosis.

Highly Cited

2005·

82citations

·P. Choy et al.

Biochemistry and cell biology = Biochimie et biologie cellulaire·

DOI

Familial hypercholesterolaemia

Familial hypercholesterolaemia is a common inherited disorder with elevated LDL cholesterol levels, which can lead to cardiovascular disease, and requires lifelong LDL cholesterol-lowering treatment to improve CVD-free survival and longevity.

Highly Cited

2017·

338citations

·J. Defesche et al.

Nature Reviews Disease Primers·

DOI

Why patients with familial hypercholesterolemia are at high cardiovascular risk? Beyond LDL-C levels.

Familial hypercholesterolemia patients have a higher risk of cardiovascular disease beyond high LDL-C levels, with additional risk factors beyond LDL-C levels playing a role in their increased risk.

Literature Review

2020·

64citations

·V. Bianconi et al.

Trends in cardiovascular medicine·

DOI

The effects of foods on LDL cholesterol levels: A systematic review of the accumulated evidence from systematic reviews and meta-analyses of randomized controlled trials.

Foods high in unsaturated fats, plant sterols, and soluble fiber can moderately reduce LDL cholesterol levels, while unfiltered coffee may increase it, with other foods having mixed effects.

Systematic ReviewHighly Cited

2021·

122citations

·Malin Schoeneck et al.

Nutrition, metabolism, and cardiovascular diseases : NMCD·

DOI

Elevated Remnant Cholesterol Causes Both Low-Grade Inflammation and Ischemic Heart Disease, Whereas Elevated Low-Density Lipoprotein Cholesterol Causes Ischemic Heart Disease Without Inflammation

Elevated nonfasting remnant cholesterol is causally associated with both low-grade inflammation and ischemic heart disease, while elevated LDL cholesterol is associated with ischemic heart disease without inflammation.

Observational StudyVery Rigorous JournalHighly Cited

2013·

584citations

·A. Varbo et al.

Circulation·

DOI

The Role of Lipids and Lipoproteins in Atherosclerosis

Elevated LDL cholesterol and apolipoprotein B 100 contribute to atherosclerosis, while HDL cholesterol levels are inversely related to cardiovascular events, with HDL dysfunction potentially promoting cardiometabolic disease.

Highly Cited

2015·

89citations

·M. Linton et al.

Reducing cardiovascular risk in patients with familial hypercholesterolemia: Risk prediction and lipid management.

Familial hypercholesterolemia (FH) risk is heterogenous and can be managed with high dose high potency statins, ezetimibe, and PCSK9 inhibitors.

2019·

48citations

·M. Miname et al.

Progress in cardiovascular diseases·

DOI

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