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María de Las Mercedes Carro et al.
Biochimica et biophysica acta. Biomembranes, 1862(9), 183357-183357 (2020-05-18)
Ram sperm are particularly sensitive to freeze-thawing mainly due to their lipid composition, limiting their use in artificial insemination programs. We evaluated the extent of cholesterol and desmosterol incorporation into ram sperm through incubation with increasing concentrations of methyl-β-cyclodextrin (MβCD)-sterol...
Eri H Hayakawa et al.
Scientific reports, 10(1), 2794-2794 (2020-02-19)
Cholesterol, a necessary component of animal cell membranes, is also needed by the lethal human malaria parasite Plasmodium falciparum. Because P. falciparum lacks a cholesterol synthesis pathway and malaria patients have low blood cholesterol, we speculated that it scavenges cholesterol...
Florly S Ariola et al.
Biophysical journal, 96(7), 2696-2708 (2009-04-08)
Cholesterol-rich, liquid-ordered (L(o)) domains are believed to be biologically relevant, and yet detailed knowledge about them, especially in live cells under physiological conditions, is elusive. Although these domains have been observed in model membranes, understanding cholesterol-lipid interactions at the molecular...
James E Shaw et al.
Journal of structural biology, 155(3), 458-469 (2006-08-08)
Elucidating the role that charged membrane proteins play in determining cell membrane structure and dynamics is an area of active study. We have applied in situ correlated atomic force and confocal microscopies to characterize the interaction of the NAP-22 peptide...
Hiurma Sánchez-Pérez et al.
Rheumatology (Oxford, England) (2020-02-18)
Lipid profiles appear to be altered in SLE patients due to disease activity and inflammation. Cholesterol efflux capacity (CEC) is the ability of high-density lipoprotein cholesterol to accept cholesterol from macrophages. CEC has been linked to cardiovascular events in the...
David L Marks et al.
Histochemistry and cell biology, 130(5), 819-832 (2008-09-30)
Much evidence has accumulated to show that cellular membranes such as the plasma membrane, contain multiple "microdomains" of differing lipid and protein composition and function. These domains are sometimes enriched in cholesterol and sphingolipids and are believed to be important...
Elina Shrestha et al.
The Journal of biological chemistry, 291(21), 11172-11184 (2016-03-31)
Liver X receptors (LXR) are oxysterol-activated nuclear receptors that play a central role in reverse cholesterol transport through up-regulation of ATP-binding cassette transporters (ABCA1 and ABCG1) that mediate cellular cholesterol efflux. Mouse models of atherosclerosis exhibit reduced atherosclerosis and enhanced...
Sandhya Sankaranarayanan et al.
Journal of lipid research, 52(12), 2332-2340 (2011-10-01)
Studies have shown a negative association between cellular cholesterol efflux and coronary artery disease (CAD). Standard protocol for quantitating cholesterol efflux involves labeling cells with [(3)H]cholesterol and measuring release of the labeled sterol. Using [(3)H]cholesterol is not ideal for the...
Iván Ferraz-Amaro et al.
Clinical rheumatology (2020-01-30)
Cholesterol efflux capacity (CEC) is the ability of high-density lipoprotein (HDL) cholesterol to accept cholesterol from macrophages. CEC is linked to cardiovascular events in the general population, and it has been shown to be disrupted in inflammatory states. The aim...
Bo Y Baker et al.
The Journal of biological chemistry, 282(14), 10223-10232 (2007-02-16)
Steroidogenic acute regulatory protein (StAR) stimulates adrenal and gonadal steroidogenesis by increasing the influx of cholesterol into mitochondria, where it is converted to pregnenolone to initiate steroidogenesis. StAR acts on the outer mitochondrial membrane where each molecule stimulates the mitochondrial...
Daniel Wüstner et al.
Chemistry and physics of lipids, 164(3), 221-235 (2011-02-05)
Cholesterol with BODIPY at carbon-24 of the side chain (BCh2) has recently been introduced as new cholesterol probe with superior fluorescence properties. We compare BCh2 with the intrinsically fluorescent dehydroergosterol (DHE), a well-established marker for cholesterol, by introducing simultaneous imaging...
Mingming Wang et al.
Langmuir : the ACS journal of surfaces and colloids, 34(25), 7509-7518 (2018-06-01)
This article reports a high-yield procedure for preparing microsized (giant) Janus liposomes via gel-assisted lipid swelling and clustering behavior of these liposomes directed by biotin-avidin affinity binding. Confocal fluorescence microscopy reveals in detail that these new lipid colloidal particles display...
Frederik W Lund et al.
BMC biophysics, 5, 20-20 (2012-10-20)
Cholesterol is an important membrane component, but our knowledge about its transport in cells is sparse. Previous imaging studies using dehydroergosterol (DHE), an intrinsically fluorescent sterol from yeast, have established that vesicular and non-vesicular transport modes contribute to sterol trafficking...
Toshihiko Oshita et al.
Clinica chimica acta; international journal of clinical chemistry, 503, 136-144 (2020-01-24)
Cholesterol efflux from atherosclerotic lesion is a key function of high-density lipoprotein (HDL). Recently, we established a simple, high-throughput, cell-free assay to evaluate the capacity of HDL to accept additional cholesterol, which is herein referred to as "cholesterol uptake capacity...
Maarit Hölttä-Vuori et al.
Traffic (Copenhagen, Denmark), 9(11), 1839-1849 (2008-07-24)
Analysis of sterol distribution and transport in living cells has been hampered by the lack of bright, photostable fluorescent sterol derivatives that closely resemble cholesterol. In this study, we employed atomistic simulations and experiments to characterize a cholesterol compound with...
Jannik Ruwisch et al.
American journal of respiratory cell and molecular biology (2020-01-11)
Surfactant protein C (SP-C) deficiency is found in samples from patients suffering idiopathic pulmonary fibrosis (IPF), especially in familial forms of this disease. We hypothesized that SP-C may contribute to fibrotic remodeling in aging mice and alveolar lipid homeostasis. For...
Wendy Blay Puryear et al.
Proceedings of the National Academy of Sciences of the United States of America, 109(19), 7475-7480 (2012-04-25)
The interaction between HIV and dendritic cells (DCs) is an important early event in HIV-1 pathogenesis that leads to efficient viral dissemination. Here we demonstrate a HIV gp120-independent DC capture mechanism that uses virion-incorporated host-derived gangliosides with terminal α2-3-linked sialic...
Hye-Ra Lee et al.
International journal of molecular sciences, 21(3) (2020-02-06)
Hepatitis C virus (HCV) p7 is known to be a nonselective cation channel for HCV maturation. Because the interaction of HCV proteins with host lipids in the endoplasmic reticulum membrane is crucial for the budding process, the identification of p7-lipid...
Clemens Röhrl et al.
Current pharmaceutical biotechnology, 13(2), 331-340 (2011-04-08)
Diaminobenzidine (DAB) photooxidation is a method for conversion of fluorescent signals into electron-dense precipitates that are visible in the electron microscope. Recently, we have applied this method to analyze organelles involved in holo-high density lipoprotein (HDL) particle uptake at the...
Hye-Ra Lee et al.
mBio, 11(2) (2020-04-16)
To overcome increasing bacterial resistance to conventional antibiotics, many antimicrobial peptides (AMPs) derived from host defense proteins have been developed. However, there are considerable obstacles to their application to systemic infections because of their low bioavailability. In the present study...
Silvia Scolari et al.
Biochemistry, 49(42), 9027-9031 (2010-09-25)
Seminal plasma proteins of the fibronectin type II (Fn2) family modulate mammalian spermatogenesis by triggering the release of the lipids phosphatidylcholine and cholesterol from sperm cells. Whereas the specific interaction of these proteins with phosphatidylcholine is well-understood, their selectivity for...
Jameson T Crowley et al.
PLoS pathogens, 9(1), e1003109-e1003109 (2013-01-18)
Borrelia burgdorferi, the agent of Lyme disease, has cholesterol and cholesterol-glycolipids that are essential for bacterial fitness, are antigenic, and could be important in mediating interactions with cells of the eukaryotic host. We show that the spirochetes can acquire cholesterol...
Functional inhibition of acid sphingomyelinase disrupts infection by intracellular bacterial pathogens
Cockburn CL, et al.
Life science alliance, 2(2), e201800292-e201800292 (2019)
Kaoru Yamashita et al.
Biochemical and biophysical research communications, 524(1), 184-189 (2020-01-27)
Plasma aldosterone concentration increases in proportion to the severity of heart failure, even during treatment with renin-angiotensin system inhibitors. This study investigated alternative regulatory mechanisms of aldosterone production that are significant in heart failure. Dahl salt-sensitive rats on a high-salt...
Robert M Littleton et al.
BMC complementary and alternative medicine, 12, 105-105 (2012-07-25)
Consumers are increasingly turning to plant-based complementary and alternative medicines to treat hypercholesterolemia. Many of these treatments are untested and their efficacy is unknown. This multitude of potential remedies necessitates a model system amenable to testing large numbers of organisms...
Jeremias Sibold et al.
Physical chemistry chemical physics : PCCP, 22(17), 9308-9315 (2020-04-21)
Lipid domains in plasma membranes act as molecular sorting platforms for e.g., signalling processes. In model membranes, such as freestanding or supported bilayers, some lipid domains with defined chemical composition, lipid packing and physical behaviour can be reproduced. However, in...
María Trinidad Soria-Florido et al.
Circulation, 141(6), 444-453 (2020-01-17)
Studies have failed to establish a clear link between high-density lipoprotein (HDL) cholesterol and cardiovascular disease, leading to the hypothesis that the atheroprotective role of HDL lies in its biological activity rather than in its cholesterol content. However, to date...
Michele R Plewes et al.
FASEB journal : official publication of the Federation of American Societies for Experimental Biology, 34(4), 5299-5316 (2020-02-23)
The corpus luteum is an endocrine gland that synthesizes and secretes progesterone. Luteinizing hormone (LH) activates protein kinase A (PKA) signaling in luteal cells, increasing delivery of substrate to mitochondria for progesterone production. Mitochondria maintain a highly regulated equilibrium between...
Ali Khattib et al.
BioFactors (Oxford, England), 46(1), 146-157 (2019-10-30)
Many population studies have shown that blood concentrations of high-density lipoprotein (HDL) cholesterol are inversely correlated with risk of cardiovascular disease (CVD). However, in recent studies, increasing blood HDL cholesterol concentrations failed to reduce CVD events. On the other hand...
Zaiguo Li et al.
The Journal of organic chemistry, 71(4), 1718-1721 (2006-02-14)
Analogues of cholesterol (compounds 1 and 2) and coprostanol (compound 3) containing the BODIPY fluorophore in the aliphatic tail of the free sterol have been synthesized starting with bisnorcholenic acid, cholenic acid 3beta-acetate, and lithocholic acid, respectively. An ester linkage...
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