Gene/Protein Disease Symptom Drug Enzyme Compound
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Query: UMLS:C0242339 (dyslipidemia)
 13,927 document(s) hit in 31,850,051 MEDLINE articles (0.00 seconds)

Coronary artery disease is a leading cause of death in France. Some of its risk factors are well identified such as age, smoking, high blood pressure and dyslipidemia, but some others such as lipoprotein (a) (Lp(a)) are still under investigation. Lp(a) is an LDL-like particle to which is linked an apolipoprotein (a). The latter shows a high sequence homology with plasminogen that gives Lp(a) thrombogenic properties in addition to its atherogenic capacity. Many epidemiological studies have shown that a high plasma level of Lp(a) is a risk factor for coronary, cerebral and peripheral atherosclerosis. Out of thirteen prospective studies, ten have confirmed this result. The negative results from the three remaining studies were probably due to either the inadequate storage of the samples or the preventive drug treatment given to the patients during the studies and to the lack of standardization of Lp(a) assays. More over it has been shown that beside high plasma Lp(a) level, the presence of a low molecular weight Apo(a) isoform is also related to a higher incidence of coronary artery disease. This review of the literature clearly demonstrates the relationship between Lp(a) and atherosclerosis, and the need to measure Lp(a) in order to better evaluate the risk of atherosclerotic vascular disease especially in patients with a hyper LDLemia an early cardio- or cerebrovascular disease or a family history of atherosclerosis. Management of patients with high Lp(a) concentrations should be directed at minimizing all other risk factors for atherosclerotic disease.
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PMID:[Lipoprotein(a): risk factor for atherosclerotic vascular disease important to take into account in practice]. 1021 Jul 42

The increased risk for ischemic heart disease (IHD) associated with subclinical hypothyroidism (SH) has been partly attributed to dyslipidemia. There is limited information on the effect of SH on lipoprotein (a) [Lp(a)], which is considered a significant predictor of IHD. Serum Lp(a) levels are predominantly regulated by apolipoprotein [apo(a)] gene polymorphisms. The aim of our study was to evaluate the Lp(a) levels and apo(a) phenotypes in patients with SH compared to healthy controls as well as the influence of levothyroxine substitution therapy on Lp(a) values in relation to the apo(a) isoform size. Lp(a) levels were measured in 69 patients with SH before and after restoration of a euthyroid state and in 83 age- and gender-matched healthy controls. Apo(a) isoform size was determined by sodium dodecyl sulfate (SDS) agarose gel electrophoresis followed by immunoblotting and development via chemiluminescence. Patients with SH exhibited increased Lp(a) levels compared to controls (median value 10.6 mg/dL vs. 6.0 mg/dL, p = 0.003]), but this was not because of differences in the frequencies of apo(a) phenotypes. There was no association between thyrotropin (TSH) and Lp(a) levels in patients with SH. In subjects with either low (LMW; 25 patients and 28 controls) or high (HMW; 44 patients and 55 controls) molecular weight apo(a) isoforms, Lp(a) concentrations were higher in patients than in the control group (median values 26.9 mg/dL vs. 21.8 mg/dL, p = 0.02 for LMW, and 6.0 mg/dL versus 3.3 mg/dL, p < 0.001 for HMW). Levothyroxine treatment resulted in an overall reduction of Lp(a) levels (10.6 mg/dL baseline vs. 8.9 mg/dL posttreatment, p = 0.008]). This effect was mainly evident in patients with LMW apo(a) isoforms associated with high baseline Lp(a) concentrations (median values 26.9 mg/dL vs. 23.2 mg/dL pretreatment and posttreatment, respectively; p = 0.03). In conclusion, even though a causal effect of thyroid dysfunction on Lp(a) was not clearly demonstrated in patients with SH, levothyroxine treatment is beneficial, especially in patients with increased baseline Lp(a) levels and LMW apo(a) isoforms.
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PMID:Lipoprotein (a) levels and apolipoprotein (a) isoform size in patients with subclinical hypothyroidism: effect of treatment with levothyroxine. 1281 13