関: lipoprotein A

WordNet

the 1st letter of the Roman alphabet (同)a
the blood group whose red cells carry the A antigen (同)type_A, group A
a public promotion of some product or service (同)advertisement, advertizement, advertising, advertizing, advert
a conjugated protein having a lipid component; the principal means for transporting lipids in the blood

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answer / ampere
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出典(authority):フリー百科事典『ウィキペディア（Wikipedia）』「2015/07/22 18:30:57」(JST)

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Lipoprotein(a) (also called Lp(a) or LPA) is a lipoprotein subclass. Genetic studies and numerous epidemiologic studies have identified Lp(a) as a risk factor for atherosclerotic diseases such as coronary heart disease and stroke.^[1]^[2]^[3]^[4]^[5]

Lipoprotein(a) was discovered in 1963 by Kåre Berg^[6] and the human gene encoding apolipoprotein(a) was cloned in 1987.^[7]

Structure

Lipoprotein(a) [Lp(a)] consists of an LDL-like particle and the specific apolipoprotein(a) [apo(a)], which is covalently bound to the apoB of the LDL like particle. Lp(a) plasma concentrations are highly heritable and mainly controlled by the apolipoprotein(a) gene [LPA] located on chromosome 6q26-27. Apo(a) proteins vary in size due to a size polymorphism [KIV-2 VNTR], which is caused by a variable number of so-called kringle IV repeats in the LPA gene. This size variation at the gene level is expressed on the protein level as well, resulting in apo(a) proteins with 10 to > 50 kringle IV repeats (each of the variable kringle IV consists of 114 amino acids).^[7]^[8] These variable apo(a) sizes are known as "apo(a) isoforms". There is a general inverse correlation between the size of the apo(a) isoform and the Lp(a) plasma concentration^[9] One theory for the size/plasma level correlation involves difference rates of protein synthesis. There appears to be a relationship between the number of kringle repeats and the processing time of the precursor apo (a) protein. That is, the larger the isoform, the more apo(a) precursor protein accumulates intracellularly in the endoplasmic reticulum. Lipoprotein (a) is not fully synthesized until the precursor protein is released from the cell, so the slower rate of production for the larger isoforms limits the plasma concentration.^[10]^[11]

Apo(a) is expressed by liver cells (hepatocytes), and the assembly of apo(a) and LDL particles seems to take place at the outer hepatocyte surface. The half-life of Lp(a) in the circulation is about 3 to 4 days.^[12]

Catabolism and clearance

The mechanism and sites of Lp(a) catabolism are largely unknown. Uptake via the LDL receptor is not a major pathway of Lp(a) metabolism.^[13]^[14] The kidney has been identified as playing a role in Lp(a) clearance from plasma.^[15]

Populations

Lp(a) concentrations vary over one thousandfold between individuals, from < 0.2 to > 200 mg/dL. This range of concentrations is observed in all populations studied so far. The mean and median concentrations between different world populations show distinct particularities, the main being the two- to threefold higher Lp(a) plasma concentration of populations of African descent compared to Asian, Oceanic, or European populations. The general inverse correlation between apo(a) isoform size and Lp(a) plasma concentration is observed in all populations. However, mean Lp(a) associated with certain apo(a) isoforms varies between populations.

Function

The physiological function of Lp(a)/apo(a) is still unknown. A function within the coagulation system seems plausible, given the aspect of the high homology between apo(a) and plasminogen.^[7] In fact, the LPA gene derives from a duplication of the plasminogen gene.

Other functions have been related to recruitment of inflammatory cells through interaction with Mac-1 integrin, angiogenesis, and wound healing.

However, individuals without Lp(a) or with very low Lp(a) levels seem to be healthy. Thus, plasma Lp(a) is not vital, at least under normal environmental conditions. Since apo(a)/Lp(a) derived rather recently in mammalian evolution - only old world monkeys and humans have been shown to harbour Lp(a) - its function might not be vital but just evolutionarily advantageous under certain environmental conditions, e.g. in case of exposure to certain infectious diseases.

Another possibility, suggested by Linus Pauling, is that Lp(a) is a primate adaptation to L-gulonolactone oxidase (GULO) deficiency, found only in certain lines of mammals. GULO is required for converting glucose to ascorbic acid (vitamin C), which is needed to repair arteries; following the loss of GULO, those primates that adopted diets less abundant in vitamin C may have used Lp(a) as an ascorbic-acid surrogate to repair arterial walls.^[16]

Pathology

The structure of lipoprotein (a) is similar to plasminogen and tPA (tissue plasminogen activator) and it competes with plasminogen for its binding site, leading to reduced fibrinolysis. Also, because Lp(a) stimulates secretion of PAI-1, it leads to thrombogenesis. Lp(a) also carries cholesterol and thus contributes to atherosclerosis.^[5]^[17] In addition, Lp(a) transports the more atherogenic proinflammatory oxidized phospholipids, which attract inflammatory cells to vessel walls,^[18]^[19] and leads to smooth muscle cell proliferation.^[20]

Lipoprotein(a) and disease

High Lp(a) in blood is a risk factor for coronary heart disease (CHD), cerebrovascular disease (CVD), atherosclerosis, thrombosis, and stroke.^[21] The association between Lp(a) levels and stroke is not as strong as that between Lp(a) and cardiovascular disease.^[1] Lp-a concentrations may be affected by disease states, (for example kidney failure), but are only slightly affected by diet, exercise, and other environmental factors. Most commonly prescribed lipid-reducing drugs have little or no effect on Lp(a) concentration. Results using statin medications have been mixed in most trials, although a meta-analysis published in 2012 suggests that atorvastatin may be of benefit.^[22] Niacin (nicotinic acid) and aspirin are two relatively safe, easily available and inexpensive drugs known to significantly reduce the levels of Lp(a) in some individuals with high Lp(a); they should be used under the supervision of a qualified physician.

High Lp(a) predicts risk of early atherosclerosis independently of other cardiac risk factors, including LDL. In patients with advanced cardiovascular disease, Lp(a)indicates a coagulant risk of plaque thrombosis. Apo(a) contains domains that are very similar to plasminogen (PLG). Lp(a) accumulates in the vessel wall and inhibits binding of PLG to the cell surface, reducing plasmin generation, which increases clotting. This inhibition of PLG by Lp(a) also promotes proliferation of smooth muscle cells. These unique features of Lp(a) suggest Lp(a) causes generation of clots and atherosclerosis.^[23]

Vegetarians have higher levels of Lp-a than fish eaters in one homogeneous tribal population of Tanzania raising the possibility that pharmacologic amounts of fish oil supplements may be helpful to lower the levels of Lp-a.^[24]

Some studies have shown that regular consumption of moderate amounts of alcohol leads to significant decline in plasma levels of Lp-a while other studies have not.^[25]

Diagnostic testing

Numerous studies confirming a strong correlation between elevated Lp(a) and heart disease have led to the consensus that Lp(a) is an important, independent predictor of cardiovascular disease.^[1] Animal studies have shown that Lp(a) may directly contribute to atherosclerotic damage by increasing plaque size, inflammation, instability, and smooth muscle cell growth.^[26] Genetic data also support the theory that Lp(a) causes cardiovascular disease.^[2]

The European Atherosclerosis Society currently recommends that patients with a moderate or high risk of cardiovascular disease have their lipoprotein (a) levels checked. Any patient with one of the following risk factors should be screened;

premature cardiovascular disease
familial hypercholesterolaemia
family history of premature cardiovascular disease
family history of elevated lipoprotein (a)
recurrent cardiovascular disease despite statin treatment
≥3% 10-year risk of fatal cardiovascular disease according to the European guidelines
≥10% 10-year risk of fatal and/or non-fatal cardiovascular disease according to the US guidelines^[1]

If the level is elevated, treatment should be initiated with a goal of bringing the level below 50 mg/dL. In addition, the patient's other cardiovascular risk factors (including LDL levels) should be optimally managed.^[1] Apart from the total Lp(a) plasma concentration, the apo(a) isoform might be an important risk parameter as well.^[27]^[28]

Prior studies of the relationship between LP(a) and ethnicity have shown inconsistent results. Lipoprotein (a) levels seem to differ in different populations. For example, in some African populatation, Lp(a) levels are, on average higher, than other groups, so that using a risk threshold of 30 mg/dl would classify up to > 50% of the individuals as higher risk.^[29]^[30]^[31]^[32] Some part of this complexity may be related to the different genetic factors involved in determining Lp(a) levels. One recent study showed that in different ethnic groups, different genetic alterations were associated with increased Lp(a) levels.^[33]

More recent data suggest that prior studies were under-powered. The Atherosclerosis Risk in Communities (ARIC) followed 3467 African Americans and 9851 whites for 20 years. The researchers found that an elevated Lp(a) conferred the same risk in each group. However, African Americans had roughly three times the level of Lp(a), and Lp(a) also predicted an increased risk of stroke.^[34]

Approximate levels of risk are indicated by the results below, although at present there are a variety of different methods by which to measure Lp(a). A standardized international reference material has been developed and is accepted by the WHO Expert Committee on Biological Standardization and the International Federation of Clinical Chemistry and Laboratory Medicine. Although further standardization is still needed, development of a reference material is an importance step towards standardizing results.^[35]^[36]

Lipoprotein(a) - Lp(a)^[37]

Desirable: < 14 mg/dL (< 35 nmol/l)

Borderline risk: 14 - 30 mg/dL (35 - 75 nmol/l)

High risk: 31 - 50 mg/dL (75 - 125 nmol/l)

Very high risk: > 50 mg/dL (> 125 nmol/l)

LP(a) appears with different isoforms (per kringle repeats) of apolipoprotein - 40% of the variation in Lp(a) levels when measured in mg/dl can be attributed to different isoforms. Lighter Lp(a) are also associated with disease. Thus a test with simple quantitative results may not provide a complete assessment of risk.^[38]

Treatment

At the current time, the recommended treatment for an elevated lipoprotein(a) is niacin, 1-3 grams daily, in general in an extended-release form. Niacin therapy can reduce lipoprotein(a) levels by 20-30%.^[39] Aspirin may be beneficial, as well, but has only been tested in patients that carry the apolipoprotein(a) gene minor allele variant (rs3798220).^[40]^{[unreliable medical source?]} A recent meta-analysis suggests that atorvastatin may also lower Lp(a) levels.^[22] In severe cases, such as familial hypercholesterolemia, or treatment resistant hypercholesterolemia, lipid apheresis may result in dramatic reductions of lipoprotein(a). The goal of treatment is to reduce levels to below 50 mg/dL.^[1]

Other medications that are in various stages of development include thyromimetics, cholesterol-ester-transfer protein (CETP inhibitors), anti-sense oligonucleopeptides, and proprotein convertase subtilisin/kexin type 9 (PCSK-9) inhibitors. L-carnitine may also reduce lipoprotein a levels.^[41]

Gingko biloba may be beneficial, but has not been clinically verified.^[42] Coenzyme Q-10 and pine bark extract have been suggested as beneficial, but neither has been proven in clinical trials.^[43]^[44]

The effect of estrogen on lipoprotein(a) levels is controversial. Estrogen replacement therapy in post-menopausal women appears to be associated with lower lipoprotein(a) levels. However one large study suggested that there was a decreased association between lipoprotein(a) levels and risk. In other words, it is unclear what a high lipoprotein(a) level means in a woman on estrogen therapy.^[45] Estrogen as a prevention strategy for heart disease is current topic of much research and debate. Risks and benefits may need to be considered for each individual. At present, estrogen is not indicated for treatment of elevated lipoprotein(a).^[46] Tamoxifen and raloxifen have not been shown to reduce levels.

The American Association of Pediatrics now recommends that all children be screened for cholesterol between the ages of 9 and 11. lipoprotein(a) levels should be considered in particular in children with a family history of early heart disease or hypercholesterolemia. Unfortunately, there have not been enough studies to determine which therapies might be beneficial.^[47]

Interactions

Lipoprotein(a) has been shown to interact with Calnexin,^[48]^[49] Fibronectin^[50] and Fibrinogen beta chain.^[51]

References

^ ^a ^b ^c ^d ^e ^f Nordestgaard BG, Chapman MJ, Ray K, Borén J, Andreotti F, Watts GF et al. (December 2010). "Lipoprotein(a) as a cardiovascular risk factor: current status". Eur. Heart J. 31 (23): 2844–53. doi:10.1093/eurheartj/ehq386. PMC 3295201. PMID 20965889.
^ ^a ^b Kamstrup PR, Tybjærg-Hansen A, Nordestgaard BG (April 2011). "Lipoprotein(a) and risk of myocardial infarction--genetic epidemiologic evidence of causality". Scand. J. Clin. Lab. Invest. 71 (2): 87–93. doi:10.3109/00365513.2010.550311. PMID 21231777.
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^ Marcovina SM, Kennedy H, Bittolo Bon G, Cazzolato G, Galli C, Casiglia E et al. (May 1999). "Fish intake, independent of apo(a) size, accounts for lower plasma lipoprotein(a) levels in Bantu fishermen of Tanzania: The Lugalawa Study". Arterioscler. Thromb. Vasc. Biol. 19 (5): 1250–6. doi:10.1161/01.ATV.19.5.1250. PMID 10323776.
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^ Klausen IC, Sjøl A, Hansen PS, Gerdes LU, Møller L, Lemming L et al. (July 1997). "Apolipoprotein(a) isoforms and coronary heart disease in men: a nested case-control study". Atherosclerosis 132 (1): 77–84. doi:10.1016/S0021-9150(97)00071-3. PMID 9247362.
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^ Helmhold M, Bigge J, Muche R, Mainoo J, Thiery J, Seidel D et al. (1991). "Contribution of the apo[a] phenotype to plasma Lp[a] concentrations shows considerable ethnic variation". J. Lipid Res. 32 (12): 1919–28. PMID 1840066.
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^ Schmidt K, Kraft HG, Parson W, Utermann G (2006). "Genetics of the Lp(a)/apo(a) system in an autochthonous Black African population from the Gabon". Eur. J. Hum. Genet. 14 (2): 190–201. doi:10.1038/sj.ejhg.5201512. PMID 16267501.
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^ Bonen DK, Nassir F, Hausman AM, Davidson NO (August 1998). "Inhibition of N-linked glycosylation results in retention of intracellular apo[a] in hepatoma cells, although nonglycosylated and immature forms of apolipoprotein[a] are competent to associate with apolipoprotein B-100 in vitro". J. Lipid Res. 39 (8): 1629–40. PMID 9717723.
^ Nassir F, Xie Y, Davidson NO (April 2003). "Apolipoprotein[a] secretion from hepatoma cells is regulated in a size-dependent manner by alterations in disulfide bond formation". J. Lipid Res. 44 (4): 816–27. doi:10.1194/jlr.M200451-JLR200. PMID 12562843.
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External links

Lipoprotein(a) at the US National Library of Medicine Medical Subject Headings (MeSH)

UpToDate Contents

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1. リポ蛋白aと心血管疾患 lipoprotein a and cardiovascular disease
2. Familial hypercholesterolemia in adults: Treatment
3. 血栓溶解異常による血栓性および出血性疾患 thrombotic and hemorrhagic disorders due to abnormal fibrinolysis
4. リポ蛋白の分類、代謝、およびアテローム性動脈硬化症における役割 lipoprotein classification metabolism and role in atherosclerosis
5. メンデルランダム化 mendelian randomization

English Journal

Novel anti-diabetic effect of SCM-198 via inhibiting the hepatic NF-κB pathway in db/db mice.

Huang H, Xin H, Liu X, Xu Y, Wen D, Zhang Y, Zhu YZ.SourceDepartment of Pharmacology, School of Pharmacy and Institute of Biomedical Sciences, Fudan University, Shanghai Chempartner Co. Ltd, Shanghai 201203, People's Republic of China.
Bioscience reports.Biosci Rep.2012 Apr 1;32(2):185-95.
There are reports of early evidence that suggest the involvement of chronic low-grade inflammation in the pathogenesis of Type 2 diabetes. Thus, substances that have effects in reducing inflammation could be potential drugs for Type 2 diabetes. Leonurine (4-guanidino-n-butyl syringate; SCM-198) is
PMID 21859425

Protective effects of calcium on copper toxicity in Pelteobagrus fulvidraco: Copper accumulation, enzymatic activities, histology.

Chen QL, Luo Z, Zheng JL, Li XD, Liu CX, Zhao YH, Gong Y.SourceFishery College, Huazhong Agricultural University, Wuhan 430070, China.
Ecotoxicology and environmental safety.Ecotoxicol Environ Saf.2012 Feb;76(2):126-34. Epub 2011 Oct 21.
The present study was conducted to determine interactive effects of waterborne co-exposure of copper (Cu) and calcium (Ca) on Cu accumulation, enzymatic activities and histology in yellow catfish Pelteobagrus fulvidraco and test the prediction that Ca could protect against Cu-induced toxicity in the
PMID 22019308

Japanese Journal

リポ蛋白(a)は動脈硬化の治療標的になれるのか? (動脈硬化リスクについてのpro and con)

範江林,小池智也
循環器内科 70(2), 197-201, 2011-08
NAID 40018984205

リポ蛋白(a)の著明高値をみとめた1例

水谷泰彰,高野明美,宮尾眞一
臨床神経学 50(6), 404-408, 2010-06-01
NAID 10026900395

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関連記事	「A」「lipoprotein」「lipoproteins」

「A」

Lipoprotein, Lp(a)
	PDB rendering based on 1i71.
Available structures
PDB	Ortholog search: PDBe, RCSB
List of PDB id codes
	1I71, 1JFN, 1KIV, 2FEB, 3KIV, 4KIV
Identifiers
Symbols	LPA ; AK38; APOA; LP
External IDs	OMIM: 152200 HomoloGene: 87856 GeneCards: LPA Gene
EC number	3.4.21.-
Gene ontology
Molecular function	• fibronectin binding; • serine-type endopeptidase activity; • endopeptidase inhibitor activity; • protein binding; • heparin binding; • apolipoprotein binding;
Cellular component	• extracellular region; • extrinsic component of plasma membrane; • plasma lipoprotein particle; • intracellular membrane-bounded organelle;
Biological process	• lipid metabolic process; • lipid transport; • receptor-mediated endocytosis; • blood circulation; • negative regulation of endopeptidase activity; • lipoprotein metabolic process; • tissue regeneration; • small molecule metabolic process; • myoblast differentiation; • muscle cell cellular homeostasis; • proteolysis involved in cellular protein catabolic process; • trophoblast giant cell differentiation; • labyrinthine layer blood vessel development; • mononuclear cell migration;
	Sources: Amigo / QuickGO
RNA expression pattern
	More reference expression data
Orthologs
	v; t; e;

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「lipoprotein」

　　[★] リポ蛋白 lipoprotein 　

「lipoproteins」