High Density Lipoproteins
HDL plays a crucial role in the body's lipid metabolism and cardiovascular health.
This MeSH term provides a concise overveiw of HDL, its functions, and its importance in medical research.
Most cited protocols related to «High Density Lipoproteins»
The concept of designing a genomic bank from TLGS samples was first presented to the Endocrine Research Center (ERC) and the Iranian molecular medicine network, and was funded by FA and MSD (grant number 147, 2004; grant number 265, 2008). In 2008, a project determining pedigrees according to genetic relationships was funded by ERC (grant number 321), with MSD and AAM as principal investigators. Funding of the main study began in June 2012 with an agreement between the Research Institute for Endocrine Sciences (RIES) and the deCODE genetic company (Reykjavik, Iceland), with FA and MSD as primary investigators. The final protocol for the genetic study was written by FA, MSD, MSF, and DK, and was submitted to the Ministry of Health and Medical Education in August 2012. The protocol was approved by the National Committee for Ethics in Biomedical Research in December 2012.
In this paper, we describe the TCGS (and its parent TLGS) from the perspectives of cohort assembly, follow-up, endpoint validation, baseline plasma phenotyping, DNA extraction, genotyping, participant confidentiality, power, and sample size, and discuss the TCGS in the context of other ongoing GWASs being performed in related areas. The study is organized into 5 phases: (1) cohort assembly and prospective follow-up, (2) genomic sample extraction, (3) phenotype and outcome gathering, (4) chip typing and genotype analysis, and (5) drawing family trees.
The HMDP data includes 100 inbred strains with four phenotypes (high-density lipoprotein, HDL; total cholesterol, TC; triglycerides, TG; unesterified cholesterol, UC) and four million high quality fully imputed SNPs (SNPs are downloaded from
The NFBC1966 data contains 5402 individuals with multiple metabolic traits measured and 364,590 SNPs typed. We selected four phenotypes (high-density lipoprotein, HDL; low-density lipoprotein, LDL; triglycerides, TG; C-reactive protein, CRP) among them, following previous studies3 (link). We selected individuals and SNPs following previous studies11 (link),32 (link) with the software PLINK33 (link). Specifically, we excluded individuals with missing phenotypes for any of these four phenotypes or having discrepancies between reported sex and sex determined from the X chromosome. We excluded SNPs with a minor allele frequency less than 1%, having missing values in more than 1% of the individuals, or with a Hardy-Weinberg equilibrium p value below 0.0001. This left us with 5,255 individuals and 319,111 SNPs. For each phenotype, we quantile transformed the phenotypic values to a standard normal distribution, regressed out sex, oral contraceptives and pregnancy status effects32 (link), and quantile transformed the residuals to a standard normal distribution again. We replaced the missing genotypes for a given SNP with its mean genotype value. We used the product of centered and scaled genotype matrix as an estimate of relatedness11 (link),17 (link),34 ,35 (link).
In both data sets, we quantile transformed each single phenotype to a standard normal distribution to guard against model misspecification. Although this strategy does not guarantee that the transformed phenotypes follow a multivariate normal distribution jointly, it often works well in practice when the number of phenotypes is small (see, e.g. 22 ). For both data sets, we used a standard mvLMM with an intercept term (without any other covariates), and test each SNP in turn. Because the software MTMM relies on the commercial software ASREML to estimate the variance components in the null model, we modified the MTMM source code so that it can read in the estimated variance components from GEMMA.
Most recents protocols related to «High Density Lipoproteins»
Example 1
This example demonstrates that the binding interaction of βarr with the β2-adrenergic receptor (β2AR).
The binding of βarr to GPCRs is mainly initiated through an interaction with the phosphorylated receptor C terminus, and conformational changes induced in βarr by this interaction promote coupling to the receptor TM core, as shown in
To verify that this apparent lack of interaction with βarr is not simply due to poor complex stability, two assays capable of detecting complex formation in situ were performed. First, competition radioligand binding was used to measure the allosteric effects of transducers on ligand binding to the receptor. As described by the ternary complex model, first for G proteins and later for βarrs, ligand-induced changes in receptor conformation enhance the binding and affinity of transducers, which reciprocally increase ligand affinity by stabilizing an active receptor state (De Lean A, et al. (1980) J Biol Chem 255(15):7108-7117., Gurevich V V, et al. (1997) J Biol Chem 272(46):28849-28852). When wild-type (WT) β2AR was reconstituted in high-density lipoprotein (HDL) particles to mimic a cellular membrane environment (Denisov I G & Sligar S G (2016) Nat Struct Mol Biol 23(6):481-486), G protein enhanced the affinity of the full agonist isoproterenol for non-phosphorylated HDL-β2AR by nearly 1000-fold, as expected, but βarr1 had no effect even at micromolar concentrations, as shown in
Second, to directly monitor β2AR conformational changes associated with activation, the C265 at the cytoplasmic end of TM6 was labeled with monobromobimane, an environmentally sensitive fluorophore. Receptor activation leads to an outward movement of TM6 that places the bimane label in a more solvent-exposed position, causing a decrease in fluorescence and a shift in λmax (Yao X J, et al. (2009) Proc Natl Acad Sci USA 106(23):9501-9506). Indeed, isoproterenol reduced β2AR-bimane fluorescence compared to control (DMSO), and addition of Gs but not βarr1 further attenuated fluorescence, as shown in
The results of this example demonstrate that non-phosphorylated β2AR fails to form a productive interaction with βarr.
According to previous studies in the Chinese population (38 (link), 39 (link)), metabolic disturbances and thyroid dysfunction were defined as follows: (1) overweight or obesity: BMI≥24; (2) hyperglycemia: glucose≥6.1mmol/L; (3) hypertension: SBP≥140 mmHg and/or DBP≥90mmHg; (4) hypertriglyceridemia: TG≥2.3 mmol/L; (5) low HDL: HDL-C ≤ 1.0 mmol/L; (6) hypercholesterolemia: TC≥6.2 mmol/L or LDL-C≥4.1 mmol/L; (7)abnormal TgAb: TgAb≥115 IU/L; (8) abnormal TPOAb: TPOAb ≥34 IU/L; (9) subclinical hypothyroidism (SCH): TSH >4.2 mIU/L with normal fT4 concentration (10–23 pmol/L); (10) hyperthyroidism: TSH<0.27 mIU/L and FT4 >23 pmol/L, and (11) hypothyroidism: TSH >4.2 mIU/L with low FT4 concentration (<10 pmol/L).
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More about "High Density Lipoproteins"
Also known as 'good cholesterol,' HDLs are responsible for removing excess cholesterol from the body and transporting it to the liver for elimination.
This process, called reverse cholesterol transport, helps maintain a healthy balance of cholesterol levels and reduces the risk of atherosclerosis and other heart-related diseases.
HDLs are composed of various lipids, including cholesterol, triglycerides, and phospholipids, as well as specialized proteins called apolipoproteins.
The measurement and analysis of HDL levels are important in clinical practice and medical research.
Several laboratory instruments and techniques are commonly used to assess HDL levels, including the Cobas 8000 analyzer, ELISA kits, the AU5800 analyzer, the Cobas 6000 analyzer, the AU480 analyzer, the Cobas Integra 400 Plus, the Dimension RXL, the AU680 analyzer, and the Cobas Integra 400.
These instruments and methods provide accurate and reliable results, allowing healthcare professionals and researchers to monitor HDL levels and make informed decisions about patient care and HDL-related studies.
Understanding the role of HDLs in lipid metabolism and cardiovascular health is crucial for developing new treatments, improving prevention strategies, and advancing medical knowledge.
By utilizing the insights gained from the MeSH term description and the metadescription, researchers and clinicians can optimize their HDL research and drive breakthroughs in this important area of study.