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1.
Orv Hetil ; 163(52): 2067-2071, 2022 Dec 25.
Article in Hungarian | MEDLINE | ID: mdl-36566439

ABSTRACT

It is hard to imagine a modern hospital ward without a mobile ultrasound, bedside (point-of-care) sonography (POCUS) is a technique of the 21st century, which in emergency medicine settings (for example during primary survey) might replace the stethoscope at times. In emergency medicine - which is the hospital discipline closest to primary care - bedside ultrasound is part of the routine care by now, and its use is based on evidences of thorough research. Given that the emergency outpatient population is getting closer to primary care patients both in presentation and demography, we believe that the current POCUS evidences are probably applicable to primary care as well. Based on the clinical experience gained in emergency medicine, we assume that bedside ultrasound may also be helpful in general practice reliably diagnosing certain, potentially life-threatening pathologies, reducing the length of time until definitive treatment, increasing the success rate of certain interventions, improving patients' experience, and potentially alleviating staff burnout. The present article summarizes experiences with bedside sonography in the Anglo-Saxon world and tries to find its place in the Hungarian primary care. The widespread use of bedside ultrasound, however, in the Hungarian general practice is still lagging due to numerous barriers, the most pressing of those are training, legal responsibility and financing. Regardless, we believe, that even in this early, unregulated phase, it is worth considering to introduce bedside ultrasound into daily primary care. Competent use, however, requires continuous practice; based on the average adult patient turnover in an urban Hungarian "adult only" surgery, it might take six months to gain the necessary skills to provide high level, safe patient care. Orv Hetil. 2022; 163(52): 2067-2071.


Subject(s)
Emergency Medicine , Point-of-Care Systems , Humans , Adult , Ultrasonography/methods , Hungary , Primary Health Care
2.
Proc Natl Acad Sci U S A ; 112(2): 506-11, 2015 Jan 13.
Article in English | MEDLINE | ID: mdl-25540417

ABSTRACT

Obesity increases the risk of developing life-threatening metabolic diseases including cardiovascular disease, fatty liver disease, diabetes, and cancer. Efforts to curb the global obesity epidemic and its impact have proven unsuccessful in part by a limited understanding of these chronic progressive diseases. It is clear that low-grade chronic inflammation, or metaflammation, underlies the pathogenesis of obesity-associated type 2 diabetes and atherosclerosis. However, the mechanisms that maintain chronicity and prevent inflammatory resolution are poorly understood. Here, we show that inhibitor of κB kinase epsilon (IKBKE) is a novel regulator that limits chronic inflammation during metabolic disease and atherosclerosis. The pathogenic relevance of IKBKE was indicated by the colocalization with macrophages in human and murine tissues and in atherosclerotic plaques. Genetic ablation of IKBKE resulted in enhanced and prolonged priming of the NLRP3 inflammasome in cultured macrophages, in hypertrophic adipose tissue, and in livers of hypercholesterolemic mice. This altered profile associated with enhanced acute phase response, deregulated cholesterol metabolism, and steatoheptatitis. Restoring IKBKE only in hematopoietic cells was sufficient to reverse elevated inflammasome priming and these metabolic features. In advanced atherosclerotic plaques, loss of IKBKE and hematopoietic cell restoration altered plaque composition. These studies reveal a new role for hematopoietic IKBKE: to limit inflammasome priming and metaflammation.


Subject(s)
I-kappa B Kinase/metabolism , Inflammasomes/metabolism , Inflammation/metabolism , Adipose Tissue/metabolism , Adult , Animals , Apolipoproteins E/deficiency , Apolipoproteins E/genetics , Carrier Proteins/metabolism , Female , Hematopoietic System/metabolism , Humans , I-kappa B Kinase/deficiency , I-kappa B Kinase/genetics , Inflammation/etiology , Liver/metabolism , Macrophages/metabolism , Male , Metabolic Syndrome/etiology , Metabolic Syndrome/metabolism , Mice , Mice, Inbred C57BL , Mice, Knockout , Mice, Obese , NLR Family, Pyrin Domain-Containing 3 Protein , Plaque, Atherosclerotic/etiology , Plaque, Atherosclerotic/metabolism , RNA, Messenger/genetics , RNA, Messenger/metabolism
3.
EMBO Mol Med ; 7(2): 127-39, 2015 Feb.
Article in English | MEDLINE | ID: mdl-25535254

ABSTRACT

Mycobacterium tuberculosis (MTB) remains a major challenge to global health made worse by the spread of multidrug resistance. We therefore examined whether stimulating intracellular killing of mycobacteria through pharmacological enhancement of macroautophagy might provide a novel therapeutic strategy. Despite the resistance of MTB to killing by basal autophagy, cell-based screening of FDA-approved drugs revealed two anticonvulsants, carbamazepine and valproic acid, that were able to stimulate autophagic killing of intracellular M. tuberculosis within primary human macrophages at concentrations achievable in humans. Using a zebrafish model, we show that carbamazepine can stimulate autophagy in vivo and enhance clearance of M. marinum, while in mice infected with a highly virulent multidrug-resistant MTB strain, carbamazepine treatment reduced bacterial burden, improved lung pathology and stimulated adaptive immunity. We show that carbamazepine induces antimicrobial autophagy through a novel, evolutionarily conserved, mTOR-independent pathway controlled by cellular depletion of myo-inositol. While strain-specific differences in susceptibility to in vivo carbamazepine treatment may exist, autophagy enhancement by repurposed drugs provides an easily implementable potential therapy for the treatment of multidrug-resistant mycobacterial infection.


Subject(s)
Anticonvulsants/administration & dosage , Antitubercular Agents/administration & dosage , Autophagy/drug effects , Carbamazepine/administration & dosage , Inositol/metabolism , Mycobacterium tuberculosis/drug effects , Tuberculosis/drug therapy , Tuberculosis/physiopathology , Animals , Cell Line , Disease Models, Animal , Drug Evaluation, Preclinical , Female , Humans , Macrophages/drug effects , Macrophages/immunology , Mice , Mice, Inbred C57BL , Mycobacterium tuberculosis/metabolism , TOR Serine-Threonine Kinases/genetics , TOR Serine-Threonine Kinases/metabolism , Tuberculosis/immunology , Tuberculosis/metabolism , Zebrafish
4.
Science ; 346(6209): 641-646, 2014 Oct 31.
Article in English | MEDLINE | ID: mdl-25359976

ABSTRACT

Many key components of innate immunity to infection are shared between Drosophila and humans. However, the fly Toll ligand Spaetzle is not thought to have a vertebrate equivalent. We have found that the structurally related cystine-knot protein, nerve growth factor ß (NGFß), plays an unexpected Spaetzle-like role in immunity to Staphylococcus aureus infection in chordates. Deleterious mutations of either human NGFß or its high-affinity receptor tropomyosin-related kinase receptor A (TRKA) were associated with severe S. aureus infections. NGFß was released by macrophages in response to S. aureus exoproteins through activation of the NOD-like receptors NLRP3 and NLRP4 and enhanced phagocytosis and superoxide-dependent killing, stimulated proinflammatory cytokine production, and promoted calcium-dependent neutrophil recruitment. TrkA knockdown in zebrafish increased susceptibility to S. aureus infection, confirming an evolutionarily conserved role for NGFß-TRKA signaling in pathogen-specific host immunity.


Subject(s)
Nerve Growth Factor/immunology , Receptor, trkA/immunology , Staphylococcal Infections/immunology , Staphylococcus aureus/immunology , Animals , Drosophila melanogaster/genetics , Drosophila melanogaster/immunology , Evolution, Molecular , Gene Knockdown Techniques , Host-Pathogen Interactions/genetics , Host-Pathogen Interactions/immunology , Humans , Macrophages/immunology , Nerve Growth Factor/genetics , Phagocytosis/genetics , Phagocytosis/immunology , Receptor, trkA/genetics , Staphylococcal Infections/genetics , Zebrafish/genetics , Zebrafish/immunology
5.
PLoS One ; 9(10): e108963, 2014.
Article in English | MEDLINE | ID: mdl-25330241

ABSTRACT

Chronic hyperglycemia induces insulin resistance by mechanisms that are incompletely understood. One model of hyperglycemia-induced insulin resistance involves chronic preincubation of adipocytes in the presence of high glucose and low insulin concentrations. We have previously shown that the mTOR complex 1 (mTORC1) plays a partial role in the development of insulin resistance in this model. Here, we demonstrate that treatment with Go-6976, a widely used "specific" inhibitor of cPKCs, alleviates hyperglycemia-induced insulin resistance. However, the effects of mTOR inhibitor, rapamycin and Go-6976 were not additive and only rapamycin restored impaired insulin-stimulated AKT activation. Although, PKCα, (but not -ß) was abundantly expressed in these adipocytes, our studies indicate cPKCs do not play a major role in causing insulin-resistance in this model. There was no evidence of changes in the expression or phosphorylation of PKCα, and PKCα knock-down did not prevent the reduction of insulin-stimulated glucose transport. This was also consistent with lack of IRS-1 phosphorylation on Ser-24 in hyperglycemia-induced insulin-resistant adipocytes. Treatment with Go-6976 did inhibit a component of the mTORC1 pathway, as evidenced by decreased phosphorylation of S6 ribosomal protein. Raptor knock-down enhanced the effect of insulin on glucose transport in insulin resistant adipocytes. Go-6976 had the same effect in control cells, but was ineffective in cells with Raptor knock-down. Taken together these findings suggest that Go-6976 exerts its effect in alleviating hyperglycemia-induced insulin-resistance independently of cPKC inhibition and may target components of the mTORC1 signaling pathway.


Subject(s)
Adipocytes/drug effects , Carbazoles/administration & dosage , Hyperglycemia/genetics , Insulin Resistance/genetics , Insulin/metabolism , 3T3-L1 Cells , Adipocytes/enzymology , Animals , Gene Expression Regulation/drug effects , Humans , Hyperglycemia/pathology , Mechanistic Target of Rapamycin Complex 1 , Mice , Multiprotein Complexes/genetics , Protein Kinase C-alpha/biosynthesis , Signal Transduction/drug effects , TOR Serine-Threonine Kinases/genetics
6.
Chemistry ; 18(3): 822-8, 2012 Jan 16.
Article in English | MEDLINE | ID: mdl-22190419

ABSTRACT

We designed and synthesised carboxymethylmonobenzocyclooctyne (COMBO) through a four-step reaction pathway. COMBO is a new, structurally simple, non-fluorinated, and directly conjugable copper-free click reagent, which shows excellent reaction kinetics, as also evidenced by theoretical calculations. Additionally, the carboxylic acid appendage allows further conjugation to biomolecules or fluorescent labels. The utility of COMBO in bioorthogonal labelling schemes was demonstrated when a COMBO-containing fluorescent label was employed in glycan imaging of HeLa cells (metabolically modified to have azidosialic acid residues on their cell-surface glycans).


Subject(s)
Cyclooctanes/chemical synthesis , Fluorescent Dyes/chemical synthesis , Animals , Click Chemistry , Copper/chemistry , Cricetinae , Cyclooctanes/chemistry , Fluorescent Dyes/chemistry , HeLa Cells , Humans , Molecular Structure , Polysaccharides/analysis
7.
J Clin Invest ; 121(9): 3554-63, 2011 Sep.
Article in English | MEDLINE | ID: mdl-21804191

ABSTRACT

Azithromycin is a potent macrolide antibiotic with poorly understood antiinflammatory properties. Long-term use of azithromycin in patients with chronic inflammatory lung diseases, such as cystic fibrosis (CF), results in improved outcomes. Paradoxically, a recent study reported that azithromycin use in patients with CF is associated with increased infection with nontuberculous mycobacteria (NTM). Here, we confirm that long-term azithromycin use by adults with CF is associated with the development of infection with NTM, particularly the multi-drug-resistant species Mycobacterium abscessus, and identify an underlying mechanism. We found that in primary human macrophages, concentrations of azithromycin achieved during therapeutic dosing blocked autophagosome clearance by preventing lysosomal acidification, thereby impairing autophagic and phagosomal degradation. As a consequence, azithromycin treatment inhibited intracellular killing of mycobacteria within macrophages and resulted in chronic infection with NTM in mice. Our findings emphasize the essential role for autophagy in the host response to infection with NTM, reveal why chronic use of azithromycin may predispose to mycobacterial disease, and highlight the dangers of inadvertent pharmacological blockade of autophagy in patients at risk of infection with drug-resistant pathogens.


Subject(s)
Anti-Bacterial Agents , Autophagy/drug effects , Azithromycin , Cystic Fibrosis/complications , Cystic Fibrosis/drug therapy , Mycobacterium Infections/etiology , Adult , Animals , Anti-Bacterial Agents/adverse effects , Anti-Bacterial Agents/pharmacology , Anti-Bacterial Agents/therapeutic use , Azithromycin/adverse effects , Azithromycin/pharmacology , Azithromycin/therapeutic use , COS Cells , Chlorocebus aethiops , Cystic Fibrosis/microbiology , Drug Resistance, Bacterial , Enzyme Inhibitors/pharmacology , HeLa Cells , Humans , Lysosomes/metabolism , Macrolides/pharmacology , Macrophages/cytology , Macrophages/drug effects , Macrophages/microbiology , Mice , Mice, Inbred C57BL , Microtubule-Associated Proteins/genetics , Microtubule-Associated Proteins/metabolism , Mycobacterium/drug effects , Mycobacterium/pathogenicity , Mycobacterium/physiology , Mycobacterium Infections/microbiology , Phagosomes/drug effects , Phagosomes/metabolism , Recombinant Fusion Proteins/genetics , Recombinant Fusion Proteins/metabolism , Sirolimus/pharmacology
8.
Diabetes ; 58(11): 2506-15, 2009 Nov.
Article in English | MEDLINE | ID: mdl-19675138

ABSTRACT

OBJECTIVE: Glucocorticoid excess is characterized by increased adiposity, skeletal myopathy, and insulin resistance, but the precise molecular mechanisms are unknown. Within skeletal muscle, 11beta-hydroxysteroid dehydrogenase type 1 (11beta-HSD1) converts cortisone (11-dehydrocorticosterone in rodents) to active cortisol (corticosterone in rodents). We aimed to determine the mechanisms underpinning glucocorticoid-induced insulin resistance in skeletal muscle and indentify how 11beta-HSD1 inhibitors improve insulin sensitivity. RESEARCH DESIGN AND METHODS: Rodent and human cell cultures, whole-tissue explants, and animal models were used to determine the impact of glucocorticoids and selective 11beta-HSD1 inhibition upon insulin signaling and action. RESULTS: Dexamethasone decreased insulin-stimulated glucose uptake, decreased IRS1 mRNA and protein expression, and increased inactivating pSer(307) insulin receptor substrate (IRS)-1. 11beta-HSD1 activity and expression were observed in human and rodent myotubes and muscle explants. Activity was predominantly oxo-reductase, generating active glucocorticoid. A1 (selective 11beta-HSD1 inhibitor) abolished enzyme activity and blocked the increase in pSer(307) IRS1 and reduction in total IRS1 protein after treatment with 11DHC but not corticosterone. In C57Bl6/J mice, the selective 11beta-HSD1 inhibitor, A2, decreased fasting blood glucose levels and improved insulin sensitivity. In KK mice treated with A2, skeletal muscle pSer(307) IRS1 decreased and pThr(308) Akt/PKB increased. In addition, A2 decreased both lipogenic and lipolytic gene expression. CONCLUSIONS: Prereceptor facilitation of glucocorticoid action via 11beta-HSD1 increases pSer(307) IRS1 and may be crucial in mediating insulin resistance in skeletal muscle. Selective 11beta-HSD1 inhibition decreases pSer(307) IRS1, increases pThr(308) Akt/PKB, and decreases lipogenic and lipolytic gene expression that may represent an important mechanism underpinning their insulin-sensitizing action.


Subject(s)
11-beta-Hydroxysteroid Dehydrogenase Type 1/metabolism , Dexamethasone/pharmacology , Glucocorticoids/pharmacology , Insulin Resistance/physiology , Insulin/pharmacology , Muscle, Skeletal/physiology , 11-beta-Hydroxysteroid Dehydrogenase Type 1/genetics , Animals , Cell Line , Cells, Cultured/cytology , Cells, Cultured/metabolism , Deoxyglucose/metabolism , Humans , Kinetics , Mice , Muscle, Skeletal/cytology , Muscle, Skeletal/enzymology , Myoblasts/cytology , Myoblasts/enzymology , Myoblasts/physiology , Polymerase Chain Reaction , RNA/genetics , RNA/isolation & purification , RNA, Messenger/drug effects , RNA, Messenger/genetics , Reverse Transcriptase Polymerase Chain Reaction
9.
Immunol Lett ; 92(1-2): 193-7, 2004 Mar 29.
Article in English | MEDLINE | ID: mdl-15081545

ABSTRACT

Leptin is a multifunctional cytokine and hormone that primarily acts in the hypothalamus and plays a key role in regulation of food intake and energy expenditure. Leptin acts through its receptor (OBR), the product of db gene that activates the Jak/STAT pathway predominantly. To exert its functions, leptin interacts with histamine as well. Histamine is a downstream effector of leptin as its release, metabolism is enhanced by leptin and hypothalamic histamine reduces food intake. In a bi-directional regulatory loop histamine also influences leptin concentration by inhibiting its expression. In this study we demonstrate that histamine deficiency elevates serum leptin level and decreases full-length leptin receptor isoform with a slight increase of the short one and results in mild late onset obesity. These observation can help to elucidate further the bi-lateral interaction of leptin and histamine, and therefore provide useful data to understand the pathomechanism of obesity.


Subject(s)
Histamine/metabolism , Histidine Decarboxylase/genetics , Leptin/metabolism , Receptors, Cell Surface/genetics , Animals , Histidine Decarboxylase/metabolism , Mice , Mice, Knockout , Models, Biological , Protein Isoforms/genetics , Protein Isoforms/metabolism , RNA, Messenger/metabolism , Receptors, Cell Surface/metabolism , Receptors, Leptin , Reverse Transcriptase Polymerase Chain Reaction
10.
Cell Biol Int ; 28(3): 159-69, 2004.
Article in English | MEDLINE | ID: mdl-14984741

ABSTRACT

Leptin is a multifunctional cytokine and hormone that primarily acts in the hypothalamus and plays a key role in the regulation of food intake and energy expenditure. In addition, it has direct effects on many cell types on the periphery. Leptin acts through its receptor, the product of the db gene, which has six isoforms. Only one of them (OB-Rb) has full signalling capabilities and is able to activate the Jak/STAT pathway, the major pathway used by leptin to exert its effects. However, some signalling events can be initiated by the short isoforms. Besides Jak/STAT, other pathways, such as MAPK and the 5'-AMP-activated protein kinase (AMPK) pathway, are also involved in leptin signalling. Leptin also interacts with insulin signalling. In this paper, we give an overview of the signal transduction mechanisms that are related to the actions of leptin.


Subject(s)
Leptin/physiology , Signal Transduction/physiology , Animals , Humans , Lipids/physiology , Mitogen-Activated Protein Kinases/physiology , Protein-Tyrosine Kinases/physiology , Receptors, Cell Surface/physiology , Receptors, Leptin , Trans-Activators/physiology
11.
Cell Biol Int ; 27(12): 1011-5, 2003.
Article in English | MEDLINE | ID: mdl-14642533

ABSTRACT

Histamine is a biogenic amine with multiple physiological functions. Its importance in allergic inflammation is well characterized; moreover, it plays a role in the regulation of gastric acid production, various hypothalamic functions, such as food uptake, and enhancing TH2 balance during immune responses. Using histidine decarboxylase gene targeted (HDC(-/-)) BALB/c mice, we studied the effect of the absence of histamine on four cytochrome p450 enzyme activities. Their selective substrates were measured: ethoxyresorufin O-dealkylase activity of CYP1A, pentoxyresorufin O-dealkylase activity of CYP2B, chlorzoxazone 6-hydroxylase activity of CYP2E1 and ethylmorphine N-demethylase activity of CYP3A. The results indicate a significant elevation of CYP2E1 and CYP3A activities, however, no change in CYP1A and CYP2B activities was seen in HDC targeted mice compared to wild type controls with identical genetic backgrounds.


Subject(s)
Aryl Hydrocarbon Hydroxylases/biosynthesis , Cytochrome P-450 CYP2E1/biosynthesis , Histamine/metabolism , Histidine Decarboxylase/genetics , Oxidoreductases, N-Demethylating/biosynthesis , Up-Regulation , Animals , Cytochrome P-450 CYP3A , Gene Transfer Techniques , Inflammation , Liver/metabolism , Mice , Mice, Inbred BALB C
12.
Endocrinology ; 144(10): 4306-14, 2003 Oct.
Article in English | MEDLINE | ID: mdl-12960041

ABSTRACT

Histamine has been referred to as an anorexic factor that decreases appetite and fat accumulation and affects feeding behavior. Tuberomammillary histaminergic neurons have been implicated in central mediation of peripheral metabolic signals such as leptin, and centrally released histamine inhibits ob gene expression. Here we have characterized the metabolic phenotype of mice that completely lack the ability to produce histamine because of targeted disruption of the key enzyme in histamine biosynthesis (histidine decarboxylase, HDC). Histochemical analyses confirmed the lack of HDC mRNA, histamine immunoreactivity, and histaminergic innervation throughout the brain of gene knockout mouse. Aged histamine-deficient (HDC-/-) mice are characterized by visceral adiposity, increased amount of brown adipose tissue, impaired glucose tolerance, hyperinsulinemia, and hyperleptinemia. Histamine-deficient animals are not hyperphagic but gain more weight and are calorically more efficient than wild-type controls. These metabolic changes presumably are due to the impaired regulatory loop between leptin and hypothalamic histamine that results in orexigenic dominance through decreased energy expenditure, attenuated ability to induce uncoupling protein-1 mRNA in the brown adipose tissue and defect in mobilizing energy stores. Our results further support the role of histamine in regulation of energy homeostasis.


Subject(s)
Adipose Tissue/pathology , Glucose Intolerance/genetics , Histidine Decarboxylase/genetics , Leptin/blood , Viscera , Adipose Tissue, Brown/metabolism , Animals , Blood Glucose/metabolism , Body Weight , Brain/metabolism , Brain/pathology , Carrier Proteins/genetics , Energy Metabolism , Histamine/metabolism , Histidine/pharmacology , Histidine Decarboxylase/deficiency , Hormones/blood , Insulin/metabolism , Insulin Secretion , Ion Channels , Male , Membrane Proteins/genetics , Mice , Mice, Knockout , Mitochondrial Proteins , Neurons/drug effects , Neurons/physiology , RNA, Messenger/metabolism , Uncoupling Protein 1
13.
Mol Endocrinol ; 16(5): 961-76, 2002 May.
Article in English | MEDLINE | ID: mdl-11981032

ABSTRACT

Several cell lines, including ROS17/2.8 rat osteosarcoma (ROS) cells, contain functional VDRs and RXRs but are resistant to the antiproliferative effects of calcitriol and retinoids. We explored the role of receptor degradation in this hormone resistance. Results of transactivation assays indicated that ROS cells contain insufficient amounts of RXR to activate a DR-1 reporter, and Western blot analyses of cell extracts showed that the degradation of RXR is accelerated and produces an aberrant 45-kDa RXR. We stably expressed functional fluorescent chimeras of VDR and RXR [green fluorescent protein (GFP)-VDR; yellow fluorescent protein (YFP)-RXR] to evaluate degradation mechanisms and the impact of excess receptor expression on antiproliferative effects. Microscopy showed a diminished expression of YFP-RXR in ROS cells compared with the expression in CV-1 cells. Treatment with inhibitors of proteasomal degradation (lactacystin and MG132) selectively enhanced GFP-VDR and YFP-RXR expression and also increased the endogenous levels of VDR and RXR. Expression of GFP-VDR had no effect on the sensitivity of ROS cells to calcitriol. Increases of RXR levels by YFP-RXR expression, drug treatments, or the combination of the two, however, restored the growth-inhibitory effects of calcitriol and 9-cis-RA and restored p21 induction by calcitriol. These studies revealed that an accelerated and aberrant RXR degradation could cause resistance to the antiproliferative effects of calcitriol and retinoids in ROS cells.


Subject(s)
Calcitriol/pharmacology , Cell Division/drug effects , Osteosarcoma/pathology , Receptors, Retinoic Acid/metabolism , Transcription Factors/metabolism , Animals , Bacterial Proteins/genetics , Blotting, Western , Cysteine Endopeptidases/metabolism , Drug Resistance , Gene Expression , Gene Expression Regulation , Green Fluorescent Proteins , Luminescent Proteins/genetics , Multienzyme Complexes/antagonists & inhibitors , Multienzyme Complexes/metabolism , Proteasome Endopeptidase Complex , Rats , Receptors, Calcitriol/genetics , Recombinant Fusion Proteins , Retinoid X Receptors , Retinoids/pharmacology , Transcription, Genetic , Tumor Cells, Cultured
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