Why this pill lowers cholesterol only in some rats
Selective Compensatory Induction of Hepatic HMG-CoA Reductase in Response to Inhibition of Cholesterol Absorption
Not medical advice. For informational purposes only. Always consult a healthcare professional. Terms
A drug called ezetimibe blocks cholesterol from being absorbed in the gut. In sick rats that make little cholesterol themselves, the liver makes more of a key enzyme to compensate, and blood cholesterol drops. But in healthy rats that already make lots of cholesterol, the drug does nothing.
No biological mechanisms were identified in this study. This may be an epidemiological, observational, or survey-based study that reports associations rather than proposing causal biological pathways.
Systematic Reviews & Meta-Analyses
Max 100Randomized Controlled Trials
Max 90Cohort Studies
Max 72Case-Control Studies
Max 58Cross-Sectional Studies
Max 44Case Reports & Case Series
Max 30Expert Opinion & Narrative Reviews
Max 59 / 72
Evidence Score
Groups of people are followed over time to see who develops an outcome. Strong for identifying risk factors and associations, but cannot prove causation as firmly as RCTs.
Not medical advice. For informational purposes only. Always consult a healthcare professional. Terms
A drug called ezetimibe blocks cholesterol from being absorbed in the gut. In sick rats that make little cholesterol themselves, the liver makes more of a key enzyme to compensate, and blood cholesterol drops. But in healthy rats that already make lots of cholesterol, the drug does nothing.
No biological mechanisms were identified in this study. This may be an epidemiological, observational, or survey-based study that reports associations rather than proposing causal biological pathways.
Systematic Reviews & Meta-Analyses
Max 100Randomized Controlled Trials
Max 90Cohort Studies
Max 72Case-Control Studies
Max 58Cross-Sectional Studies
Max 44Case Reports & Case Series
Max 30Expert Opinion & Narrative Reviews
Max 59 / 72
Evidence Score
Groups of people are followed over time to see who develops an outcome. Strong for identifying risk factors and associations, but cannot prove causation as firmly as RCTs.
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Claims (5)
In healthy rats that naturally make a lot of cholesterol in their liver, the drug ezetimibe didn’t lower their blood cholesterol at all.
When diabetic rats ate a high-cholesterol diet and were given a drug called ezetimibe, their blood cholesterol dropped dramatically, and their liver made more of a key cholesterol-making enzyme—not by making more of its instructions, but by using the existing instructions more efficiently.
In rats without thyroid glands that ate a high-cholesterol diet, a drug called ezetimibe lowered their blood cholesterol and brought back their liver’s cholesterol-making enzyme to normal levels, but didn’t change the receptor that clears cholesterol from the blood.
Even though ezetimibe lowered cholesterol and changed a key liver enzyme in diabetic and thyroid-deficient rats, it didn’t change the liver’s cholesterol-cleaning receptors at all.
Ezetimibe works best when the liver isn’t making much cholesterol on its own and the gut is absorbing a lot from food.