Abstract:
:The low-density lipoprotein (LDL) receptor (LDL-R) family consists of cell-surface receptors that recognize extracellular ligands and internalize them for degradation by lysosomes. The LDL-R is the prototype of this family, which also contains very-low-density lipoprotein receptors (VLDL-R), apolipoprotein E receptor 2, LRP, and megalin. The family members contain four major structural modules: the cysteine-rich complement-type repeats, epidermal growth factor precursor-like repeats, a transmembrane domain, and a cytoplasmic domain. Each structural module serves distinct and important functions. These receptors bind several structurally dissimilar ligands. It is proposed that instead of a primary sequence, positive electrostatic potential in different ligands constitutes a receptor binding domain. This family of receptors plays crucial roles in various physiologic functions. LDL-R plays an important role in cholesterol homeostasis. Mutations cause familial hypercholesterolemia and premature coronary artery disease. LDL-R-related protein plays an important role in the clearance of plasma-activated alpha 2-macroglobulin and apolipoprotein E-enriched lipoproteins. It is essential for fetal development and has been associated with Alzheimer's disease. Megalin is the major receptor in absorptive epithelial cells of the proximal tubules and an antigenic determinant for Heymann nephritis in rats. Mutations in a chicken homolog of VLDL-R cause female sterility and premature atherosclerosis. This receptor is not expressed in liver tissue; however, transgenic expression of VLDL-R in liver corrects hypercholesterolemia in experiment animals, which suggests that it can be a candidate for gene therapy for various hyperlipidemias. The functional importance of individual receptors may lie in their differential tissue expression. The regulation of expression of these receptors occurs at the transcriptional level. Expression of the LDL-R is regulated by intracellular sterol levels involving novel membrane-bound transcription factors. Other members of the family are not regulated by sterols. All the members are, however, regulated by hormones and growth factors, but the mechanisms of regulation by hormones have not been elucidated. Studies of these receptors have provided important insights into receptor structure-function and mechanisms of ligand removal and catabolism. It is anticipated that increased knowledge about the LDL-R family members will open new avenues for the treatment of many disorders.
journal_name
Annu Rev Nutrjournal_title
Annual review of nutritionauthors
Hussain MM,Strickland DK,Bakillah Adoi
10.1146/annurev.nutr.19.1.141subject
Has Abstractpub_date
1999-01-01 00:00:00pages
141-72eissn
0199-9885issn
1545-4312journal_volume
19pub_type
杂志文章,评审abstract::Cholesterol and its metabolites play a variety of essential roles in living systems. Virtually all animal cells require cholesterol, which they acquire through synthesis or uptake, but only the liver can degrade cholesterol. The ABCA1 gene product regulates the rate-controlling step in the removal of cellular choleste...
journal_title:Annual review of nutrition
pub_type: 杂志文章,评审
doi:10.1146/annurev.nutr.26.061505.111214
更新日期:2006-01-01 00:00:00
abstract::In the past, alcoholic liver disease was attributed exclusively to dietary deficiencies, but experimental and judicious clinical studies have now established alcohol's hepatotoxicity. Despite an adequate diet, it can contribute to the entire spectrum of liver diseases, mainly by generating oxidative stress through its...
journal_title:Annual review of nutrition
pub_type: 杂志文章,评审
doi:10.1146/annurev.nutr.20.1.395
更新日期:2000-01-01 00:00:00
abstract::The "fetal origins" hypothesis postulates that conditions, most likely nutritional, "program" the fetus for the development of chronic diseases in adulthood. Associations between the newborn's size at birth and various determinants or consequences of chronic diseases have been identified in many, but not all, of the a...
journal_title:Annual review of nutrition
pub_type: 杂志文章,评审
doi:10.1146/annurev.nutr.21.1.73
更新日期:2001-01-01 00:00:00
abstract::Some of us who were born in the middle of Europe between World Wars I and II had to face quite a few unusual challenges that we all met in different ways. I was born and raised in Prague, Czechoslovakia, a country at the time of my birth that was governed by a Western style of democracy, which was later destroyed by t...
journal_title:Annual review of nutrition
pub_type: 传,历史文章,杂志文章
doi:10.1146/annurev.nutr.23.011702.073155
更新日期:2003-01-01 00:00:00
abstract::Glucose is an essential nutrient for the human body. It is the major energy source for many cells, which depend on the bloodstream for a steady supply. Blood glucose levels, therefore, are carefully maintained. The liver plays a central role in this process by balancing the uptake and storage of glucose via glycogenes...
journal_title:Annual review of nutrition
pub_type: 杂志文章,评审
doi:10.1146/annurev.nutr.19.1.379
更新日期:1999-01-01 00:00:00
abstract::Tentative qualitative and quantitative amino acid requirements have been reported for the major species of fish reared for market or as replacement stocks for natural waters. Most work has concentrated upon juvenile fish or upon rapidly growing young market fish; these have high protein dietary requirements (30-50%) t...
journal_title:Annual review of nutrition
pub_type: 杂志文章,评审
doi:10.1146/annurev.nu.06.070186.001301
更新日期:1986-01-01 00:00:00
abstract::Mechanisms involved in the digestion and absorption of dietary vitamin A require the participation of several proteins. Dietary retinyl esters are hydrolyzed in the intestine by the pancreatic enzyme, pancreatic triglyceride lipase, and intestinal brush border enzyme, phospholipase B. Unesterified retinol taken up by ...
journal_title:Annual review of nutrition
pub_type: 杂志文章,评审
doi:10.1146/annurev.nutr.25.050304.092614
更新日期:2005-01-01 00:00:00
abstract::There are many tumors that have paraneoplastic syndromes. Furthermore, location of certain tumors can result in very specific effects on the host, especially tumors in the hypothalamus, the intestinal tract, or the liver. Finally, tumors of the immune system can have significant distant consequences. However, from dir...
journal_title:Annual review of nutrition
pub_type: 杂志文章,评审
doi:10.1146/annurev.nu.05.070185.002251
更新日期:1985-01-01 00:00:00
abstract::Maternal micronutrient requirements during pregnancy increase to meet the physiologic changes in gestation and fetal demands for growth and development. Maternal micronutrient deficiencies are high and coexist in many settings, likely influencing birth and newborn outcomes. The only recommendation for pregnancy curren...
journal_title:Annual review of nutrition
pub_type: 杂志文章,评审
doi:10.1146/annurev.nutr.012809.104813
更新日期:2010-08-21 00:00:00
abstract::Investigations into regulating metabolic pathways with stable isotopes have, over the past decade, undergone major development with the use of nuclear magnetic resonance and mass spectrometry in studying labeling patterns of newly synthesized biomolecules. In this review, we concentrate on investigations of mass isoto...
journal_title:Annual review of nutrition
pub_type: 杂志文章,评审
doi:10.1146/annurev.nutr.17.1.559
更新日期:1997-01-01 00:00:00
abstract::Calcium requirements may vary throughout the lifespan. During the growth years and up to age 25-30, it is important to maximize dietary intake of calcium to maintain positive calcium balance and achieve peak bone mass, thereby possibly decreasing the risk of fracture when bone is subsequently lost. The RDA for age 10-...
journal_title:Annual review of nutrition
pub_type: 杂志文章,评审
doi:10.1146/annurev.nu.10.070190.002145
更新日期:1990-01-01 00:00:00
abstract::The objective of this review is to evaluate the evidence for a link between maternal obesity and poor lactation performance. In nonhuman species, excess maternal fatness is deleterious for lactation and also for maternal health and survival. These effects occur during pregnancy and as milk production is beginning. The...
journal_title:Annual review of nutrition
pub_type: 杂志文章,评审
doi:10.1146/annurev.nutr.27.061406.093738
更新日期:2007-01-01 00:00:00
abstract::Lipolysis of white adipose tissue triacylglycerol stores results in the liberation of glycerol and nonesterified fatty acids that are released into the vasculature for use by other organs as energy substrates. In response to changes in nutritional state, lipolysis rates are precisely regulated through hormonal and bio...
journal_title:Annual review of nutrition
pub_type: 杂志文章,评审
doi:10.1146/annurev.nutr.27.061406.093734
更新日期:2007-01-01 00:00:00
abstract::Neural tube defects (NTDs) are the most severe congenital malformations of the central nervous system. The etiology is complex, with both genetic and environmental factors having important contributions. Researchers have known for the past two decades that maternal periconceptional use of the B vitamin folic acid can ...
journal_title:Annual review of nutrition
pub_type: 杂志文章,评审
doi:10.1146/annurev-nutr-071714-034235
更新日期:2017-08-21 00:00:00
abstract::Vitamin D deficiency is prevalent throughout the world, and growing evidence supports a requirement for optimal vitamin D levels for the healthy developing and adult brain. Vitamin D has important roles in proliferation and differentiation, calcium signaling within the brain, and neurotrophic and neuroprotective actio...
journal_title:Annual review of nutrition
pub_type: 杂志文章,评审
doi:10.1146/annurev-nutr-071813-105557
更新日期:2014-01-01 00:00:00
abstract::More than one million Americans were expected to be diagnosed with cancer in 2003 (7a). Compelling experimental, epidemiological, and clinical evidence indicates that many cancers are preventable, especially because diet and nutrition are key factors in the modulation of cancer risk. The road to nutritional interventi...
journal_title:Annual review of nutrition
pub_type: 杂志文章,评审
doi:10.1146/annurev.nutr.24.012003.132315
更新日期:2004-01-01 00:00:00
abstract::Research describing fatty acids as modulators of inflammation and immune responses abounds. Many of these studies have focused on one particular group of fatty acids, omega-3. The data from animal studies have shown that these fatty acids can have powerful anti-inflammatory and immunomodulatory activities in a wide ar...
journal_title:Annual review of nutrition
pub_type: 杂志文章,评审
doi:10.1146/annurev.nutr.25.050304.092610
更新日期:2006-01-01 00:00:00
abstract::Epidemiologic and experimental evidence reviewed in this article emphasizes the complex and multifactorial etiology of endemic goiter. The important role of iodine deficiency as an etiologic factor in endemic goiter is firmly established, but there is evidence that other environmental factors can play an equally impor...
journal_title:Annual review of nutrition
pub_type: 杂志文章,评审
doi:10.1146/annurev.nu.10.070190.000321
更新日期:1990-01-01 00:00:00
abstract::Since the late 1980s, there has been an explosion of information on the molecular mechanisms and functions of vitamin A. This review focuses on the essential role of vitamin A in female reproduction and embryonic development and the metabolism of vitamin A (retinol) that results in these functions. Evidence strongly s...
journal_title:Annual review of nutrition
pub_type: 杂志文章,评审
doi:10.1146/annurev.nutr.22.010402.102745E
更新日期:2002-01-01 00:00:00
abstract::Caloric restriction (CR), the consumption of fewer calories without malnutrition, and reduced insulin and/or IGFI receptor signaling delay many age-related physiological changes and extend the lifespan of many model organisms. Here, we present and review microarray and biochemical studies indicating that the potent an...
journal_title:Annual review of nutrition
pub_type: 杂志文章,评审
doi:10.1146/annurev.nutr.27.061406.093743
更新日期:2007-01-01 00:00:00
abstract::A full review of the strengths and limitations of the various methods used to define amino acid requirements is provided. The focus is on the recent development of carbon oxidation techniques such as indicator amino acid oxidation and 24-h amino acid balance to determine dietary indispensable (essential) amino acid ne...
journal_title:Annual review of nutrition
pub_type: 杂志文章,评审
doi:10.1146/annurev.nutr.23.011702.073247
更新日期:2003-01-01 00:00:00
abstract::Recent advances in the knowledge of iron metabolism underscore its complex relationship to overall cell metabolism. One of the key components of the iron uptake and storage pathway is ferritin, a protein that sequesters iron in a nontoxic form. Ferritin synthesis is translationally regulated by iron. Molecules such as...
journal_title:Annual review of nutrition
pub_type: 杂志文章,评审
doi:10.1146/annurev.nu.15.070195.001323
更新日期:1995-01-01 00:00:00
abstract::Bone minerals and vitamin D are crucial for infants and small children. Human milk has little vitamin D, and supplemental vitamin D must be given to all infants either via drops or as contained in infant formula or foods. The calcium and phosphorus in human milk are adequate for infants in the first six months of life...
journal_title:Annual review of nutrition
pub_type: 杂志文章,评审
doi:10.1146/annurev-nutr-072610-145216
更新日期:2011-08-21 00:00:00
abstract::Long-chain fatty acids are involved in all aspects of cellular structure and function. For controlling amounts of fatty acids, cells are endowed with two acetyl-coenzyme A carboxylase (ACC) systems. ACC-alpha is the rate-limiting enzyme in the biogenesis of long-chain fatty acids, and ACC-beta is believed to control m...
journal_title:Annual review of nutrition
pub_type: 杂志文章,评审
doi:10.1146/annurev.nutr.17.1.77
更新日期:1997-01-01 00:00:00
abstract::The ability to taste bitter thiourea compounds, such as phenylthiocarbamide (PTC) and 6-n-propylthiouracil (PROP), is inherited. Polymorphisms in the bitter-taste receptor TAS2R38 explain the majority of phenotypic variation in the PROP phenotype. It has been hypothesized that the PROP phenotype is a marker for percep...
journal_title:Annual review of nutrition
pub_type: 杂志文章,评审
doi:10.1146/annurev-nutr-071715-050916
更新日期:2016-07-17 00:00:00
abstract::Given their similar physiochemical properties, it is a logical postulate that iron and copper metabolism are intertwined. Indeed, iron-copper interactions were first documented over a century ago, but the homeostatic effects of one on the other has not been elucidated at a molecular level to date. Recent experimental ...
journal_title:Annual review of nutrition
pub_type: 杂志文章,评审
doi:10.1146/annurev-nutr-071812-161215
更新日期:2014-01-01 00:00:00
abstract::Hepcidin, a peptide hormone made in the liver, is the principal regulator of systemic iron homeostasis. Hepcidin controls plasma iron concentration and tissue distribution of iron by inhibiting intestinal iron absorption, iron recycling by macrophages, and iron mobilization from hepatic stores. Hepcidin acts by inhibi...
journal_title:Annual review of nutrition
pub_type: 杂志文章,评审
doi:10.1146/annurev.nutr.26.061505.111303
更新日期:2006-01-01 00:00:00
abstract::The biosynthesis of one riboflavin molecule requires one molecule of GTP and two molecules of ribulose 5-phosphate as substrates. The imidazole ring of GTP is hydrolytically opened, yielding a 4, 5-diaminopyrimidine which is converted to 5-amino-6-ribitylamino-2, 4(1H,3H)-pyrimidinedione by a sequence of deamination, ...
journal_title:Annual review of nutrition
pub_type: 杂志文章,评审
doi:10.1146/annurev.nutr.20.1.153
更新日期:2000-01-01 00:00:00
abstract::Some coffee brewing techniques raise the serum concentration of total and low-density-lipoprotein cholesterol in humans, whereas others do not. The responsible factors are the diterpene lipids cafestol and kahweol, which make up about 1% (wt:wt) of coffee beans. Diterpenes are extracted by hot water but are retained b...
journal_title:Annual review of nutrition
pub_type: 杂志文章,评审
doi:10.1146/annurev.nutr.17.1.305
更新日期:1997-01-01 00:00:00
abstract::How much vitamin E is enough? An established use of supplemental vitamin E in humans is in the prevention and therapy of deficiency symptoms. The cause of vitamin E deficiency, characterized by peripheral neuropathy and ataxia, is usually malabsorption-a result of fat malabsorption or genetic abnormalities in lipoprot...
journal_title:Annual review of nutrition
pub_type: 杂志文章,评审
doi:10.1146/annurev.nu.16.070196.001541
更新日期:1996-01-01 00:00:00