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Wang D, Sun D, Wang X, Peng X, Ji Y, Tang L, He Q, Chen D, Yang Y, Zhou X, Xiong B, Ai J. Remodeling tumor-associated macrophage for anti-cancer effects by rational design of irreversible inhibition of mitogen-activated protein kinase-activated protein kinase 2. MedComm (Beijing) 2024; 5:e634. [PMID: 38988492 PMCID: PMC11233931 DOI: 10.1002/mco2.634] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/22/2023] [Revised: 05/29/2024] [Accepted: 05/30/2024] [Indexed: 07/12/2024] Open
Abstract
Mitogen-activated protein kinase-activated protein kinase 2 (MK2) emerges as a pivotal target in developing anti-cancer therapies. The limitations of ATP-competitive inhibitors, due to insufficient potency and selectivity, underscore the urgent need for a covalent irreversible MK2 inhibitor. Our initial analyses of The Cancer Genome Atlas database revealed MK2's overexpression across various cancer types, especially those characterized by inflammation, linking it to poor prognosis and highlighting its significance. Investigating MK2's kinase domain led to the identification of a unique cysteine residue, enabling the creation of targeted covalent inhibitors. Compound 11 was developed, demonstrating robust MK2 inhibition (IC50 = 2.3 nM) and high selectivity. It binds irreversibly to MK2, achieving prolonged signal suppression and reducing pathological inflammatory cytokines in macrophages. Furthermore, compound 11 or MK2 knockdown can inhibit the tumor-promoting macrophage M2 phenotype in vitro and in vivo. In macrophage-rich tumor model, compound 11 notably slowed growth in a dose-dependent manner. These findings support MK2 as a promising anticancer target, especially relevant in cancers fueled by inflammation or dominated by macrophages, and provide compound 11 serving as an invaluable chemical tool for exploring MK2's functions.
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Affiliation(s)
- Danyi Wang
- State Key Laboratory of Drug ResearchShanghai Institute of Materia MedicaChinese Academy of SciencesShanghaiP. R. China
- School of PharmacyUniversity of Chinese Academy of SciencesBeijingP. R. China
| | - Deqiao Sun
- State Key Laboratory of Drug ResearchShanghai Institute of Materia MedicaChinese Academy of SciencesShanghaiP. R. China
- School of PharmacyUniversity of Chinese Academy of SciencesBeijingP. R. China
| | - Xiaoyan Wang
- School of PharmacyUniversity of Chinese Academy of SciencesBeijingP. R. China
| | - Xia Peng
- State Key Laboratory of Drug ResearchShanghai Institute of Materia MedicaChinese Academy of SciencesShanghaiP. R. China
- School of PharmacyUniversity of Chinese Academy of SciencesBeijingP. R. China
| | - Yinchun Ji
- State Key Laboratory of Drug ResearchShanghai Institute of Materia MedicaChinese Academy of SciencesShanghaiP. R. China
- School of PharmacyUniversity of Chinese Academy of SciencesBeijingP. R. China
| | - Lu Tang
- School of PharmacyUniversity of Chinese Academy of SciencesBeijingP. R. China
- State Key Laboratory of Chemical BiologyShanghai Institute of Materia MedicaChinese Academy of SciencesShanghaiP. R. China
| | - Qichang He
- State Key Laboratory of Chemical BiologyShanghai Institute of Materia MedicaChinese Academy of SciencesShanghaiP. R. China
| | - Danqi Chen
- School of PharmacyUniversity of Chinese Academy of SciencesBeijingP. R. China
- State Key Laboratory of Chemical BiologyShanghai Institute of Materia MedicaChinese Academy of SciencesShanghaiP. R. China
| | - Ye Yang
- State Key Laboratory of Drug ResearchShanghai Institute of Materia MedicaChinese Academy of SciencesShanghaiP. R. China
- School of PharmacyUniversity of Chinese Academy of SciencesBeijingP. R. China
| | - Xuan Zhou
- State Key Laboratory of Drug ResearchShanghai Institute of Materia MedicaChinese Academy of SciencesShanghaiP. R. China
- School of PharmacyUniversity of Chinese Academy of SciencesBeijingP. R. China
| | - Bing Xiong
- School of PharmacyUniversity of Chinese Academy of SciencesBeijingP. R. China
- State Key Laboratory of Chemical BiologyShanghai Institute of Materia MedicaChinese Academy of SciencesShanghaiP. R. China
| | - Jing Ai
- State Key Laboratory of Drug ResearchShanghai Institute of Materia MedicaChinese Academy of SciencesShanghaiP. R. China
- School of PharmacyUniversity of Chinese Academy of SciencesBeijingP. R. China
- Shandong Laboratory of Yantai Drug DiscoveryBohai Rim Advanced Research Institute for Drug DiscoveryYantaiP. R. China
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Gao G, Zhang H, Ni J, Zhao X, Zhang K, Wang J, Kong X, Wang Q. Insights into genetic diversity and phenotypic variations in domestic geese through comprehensive population and pan-genome analysis. J Anim Sci Biotechnol 2023; 14:150. [PMID: 38001525 PMCID: PMC10675864 DOI: 10.1186/s40104-023-00944-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/23/2023] [Accepted: 10/06/2023] [Indexed: 11/26/2023] Open
Abstract
BACKGROUND Domestic goose breeds are descended from either the Swan goose (Anser cygnoides) or the Greylag goose (Anser anser), exhibiting variations in body size, reproductive performance, egg production, feather color, and other phenotypic traits. Constructing a pan-genome facilitates a thorough identification of genetic variations, thereby deepening our comprehension of the molecular mechanisms underlying genetic diversity and phenotypic variability. RESULTS To comprehensively facilitate population genomic and pan-genomic analyses in geese, we embarked on the task of 659 geese whole genome resequencing data and compiling a database of 155 RNA-seq samples. By constructing the pan-genome for geese, we generated non-reference contigs totaling 612 Mb, unveiling a collection of 2,813 novel genes and pinpointing 15,567 core genes, 1,324 softcore genes, 2,734 shell genes, and 878 cloud genes in goose genomes. Furthermore, we detected an 81.97 Mb genomic region showing signs of genome selection, encompassing the TGFBR2 gene correlated with variations in body weight among geese. Genome-wide association studies utilizing single nucleotide polymorphisms (SNPs) and presence-absence variation revealed significant genomic associations with various goose meat quality, reproductive, and body composition traits. For instance, a gene encoding the SVEP1 protein was linked to carcass oblique length, and a distinct gene-CDS haplotype of the SVEP1 gene exhibited an association with carcass oblique length. Notably, the pan-genome analysis revealed enrichment of variable genes in the "hair follicle maturation" Gene Ontology term, potentially linked to the selection of feather-related traits in geese. A gene presence-absence variation analysis suggested a reduced frequency of genes associated with "regulation of heart contraction" in domesticated geese compared to their wild counterparts. Our study provided novel insights into gene expression features and functions by integrating gene expression patterns across multiple organs and tissues in geese and analyzing population variation. CONCLUSION This accomplishment originates from the discernment of a multitude of selection signals and candidate genes associated with a wide array of traits, thereby markedly enhancing our understanding of the processes underlying domestication and breeding in geese. Moreover, assembling the pan-genome for geese has yielded a comprehensive apprehension of the goose genome, establishing it as an indispensable asset poised to offer innovative viewpoints and make substantial contributions to future geese breeding initiatives.
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Affiliation(s)
- Guangliang Gao
- Chongqing Academy of Animal Science, Rongchang District, Chongqing, 402460, China
- Livestock and Poultry Multi-Omics Key Laboratory of Ministry of Agriculture and Rural Affairs, College of Animal Science and Technology, Sichuan Agricultural University, Chengdu, 611130, China
- Chongqing Engineering Research Center of Goose Genetic Improvement, Rongchang District, Chongqing, 402460, China
| | - Hongmei Zhang
- Department of Cardiovascular Ultrasound and Non-Invasive Cardiology, Sichuan Academy of Medical Sciences and Sichuan Provincial People's Hospital,University of Electronic Science and Technology of China, Chengdu, 611731, China
- Ultrasound in Cardiac Electrophysiology and Biomechanics Key Laboratory of Sichuan Province, University of Electronic Science and Technology of China, Chengdu, 611731, China
| | - Jiangping Ni
- JiguangGene Biotechnology Co., Ltd., Nanjing, 210032, China
| | - Xianzhi Zhao
- Chongqing Academy of Animal Science, Rongchang District, Chongqing, 402460, China
- Chongqing Engineering Research Center of Goose Genetic Improvement, Rongchang District, Chongqing, 402460, China
| | - Keshan Zhang
- Chongqing Academy of Animal Science, Rongchang District, Chongqing, 402460, China
- Chongqing Engineering Research Center of Goose Genetic Improvement, Rongchang District, Chongqing, 402460, China
| | - Jian Wang
- Jiangsu Agri-Animal Vocational College, Taizhou, 225300, China
| | - Xiangdong Kong
- JiguangGene Biotechnology Co., Ltd., Nanjing, 210032, China.
| | - Qigui Wang
- Chongqing Academy of Animal Science, Rongchang District, Chongqing, 402460, China.
- Chongqing Engineering Research Center of Goose Genetic Improvement, Rongchang District, Chongqing, 402460, China.
- Present Address: Poultry Science Institute, Chongqing Academy of Animal Science, No. 51 Changzhou Avenue, Rongchang District, Chongqing, 402460, P. R. China.
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Buker SM, Boriack-Sjodin PA, Copeland RA. Enzyme-Inhibitor Interactions and a Simple, Rapid Method for Determining Inhibition Modality. SLAS DISCOVERY 2019; 24:515-522. [PMID: 30811960 DOI: 10.1177/2472555219829898] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
Contemporary chemical biology and drug discovery are increasingly focused on the discovery of inhibitory molecules that interact with enzyme targets in specific ways, such as allosteric or orthosteric binding. Hence, there is increasing interest in evaluating hit compounds from high-throughput diversity screening to determine their mode of interaction with the target. In this work, the common inhibition modalities are reviewed and clarified. The impact of substrate concentration, relative to substrate KM, for each common inhibition modality is also reviewed. The pattern of changes in IC50 that accompany increasing substrate concentration are shown to be diagnostic of specific inhibition modalities. Thus, replots of IC50 as a function of the ratio [S]/KM are recommended as a simple and rapid means of assessing inhibition modality. Finally, specific recommendations are offered for ideal experimental conditions for the determination of inhibition modality through the use of IC50 replots.
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Seaton DD, Krishnan J. Effects of multiple enzyme-substrate interactions in basic units of cellular signal processing. Phys Biol 2012; 9:045009. [PMID: 22872009 DOI: 10.1088/1478-3975/9/4/045009] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
Covalent modification cycles are a ubiquitous feature of cellular signalling networks. In these systems, the interaction of an active enzyme with the unmodified form of its substrate is essential for signalling to occur. However, this interaction is not necessarily the only enzyme-substrate interaction possible. In this paper, we analyse the behaviour of a basic model of signalling in which additional, non-essential enzyme-substrate interactions are possible. These interactions include those between the inactive form of an enzyme and its substrate, and between the active form of an enzyme and its product. We find that these additional interactions can result in increased sensitivity and biphasic responses, respectively. The dynamics of the responses are also significantly altered by the presence of additional interactions. Finally, we evaluate the consequences of these interactions in two variations of our basic model, involving double modification of substrate and scaffold-mediated signalling, respectively. We conclude that the molecular details of protein-protein interactions are important in determining the signalling properties of enzymatic signalling pathways.
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Affiliation(s)
- D D Seaton
- Department of Chemical Engineering, Centre for Process Systems Engineering, Imperial College London, UK
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Mourey RJ, Burnette BL, Brustkern SJ, Daniels JS, Hirsch JL, Hood WF, Meyers MJ, Mnich SJ, Pierce BS, Saabye MJ, Schindler JF, South SA, Webb EG, Zhang J, Anderson DR. A benzothiophene inhibitor of mitogen-activated protein kinase-activated protein kinase 2 inhibits tumor necrosis factor alpha production and has oral anti-inflammatory efficacy in acute and chronic models of inflammation. J Pharmacol Exp Ther 2010; 333:797-807. [PMID: 20237073 DOI: 10.1124/jpet.110.166173] [Citation(s) in RCA: 94] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
Activation of the p38 kinase pathway in immune cells leads to the transcriptional and translational regulation of proinflammatory cytokines. Mitogen-activated protein kinase-activated protein kinase 2 (MK2), a direct downstream substrate of p38 kinase, regulates lipopolysaccharide (LPS)-stimulated tumor necrosis factor alpha (TNFalpha) and interleukin-6 (IL-6) production through modulating the stability and translation of these mRNAs. Developing small-molecule inhibitors of MK2 may yield anti-inflammatory efficacy with a different safety profile relative to p38 kinase inhibitors. This article describes the pharmacologic properties of a benzothiophene MK2 inhibitor, PF-3644022 [(10R)-10-methyl-3-(6-methylpyridin-3-yl)-9,10,11,12-tetrahydro-8H-[1,4]diazepino[5',6':4,5]thieno[3,2-f]quinolin-8-one]. PF-3644022 is a potent freely reversible ATP-competitive compound that inhibits MK2 activity (K(i) = 3 nM) with good selectivity when profiled against 200 human kinases. In the human U937 monocytic cell line or peripheral blood mononuclear cells, PF-3644022 potently inhibits TNFalpha production with similar activity (IC(50) = 160 nM). PF-3644022 blocks TNFalpha and IL-6 production in LPS-stimulated human whole blood with IC(50) values of 1.6 and 10.3 microM, respectively. Inhibition of TNFalpha in U937 cells and blood correlates closely with inhibition of phospho-heat shock protein 27, a target biomarker of MK2 activity. PF-3644022 displays good pharmacokinetic parameters in rats and is orally efficacious in both the rat acute LPS-induced TNFalpha model and the chronic streptococcal cell wall-induced arthritis model. Dose-dependent inhibition of TNFalpha production in the acute model and inhibition of paw swelling in the chronic model is observed with ED(50) values of 6.9 and 20 mg/kg, respectively. PF-3644022 efficacy in the chronic inflammation model is strongly correlated with maintaining a C(min) higher than the EC(50) measured in the rat LPS-induced TNFalpha model.
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Affiliation(s)
- Robert J Mourey
- Department of Discovery Biology, Inflammation Research Unit, Pfizer Global Research and Development, Chesterfield, Missouri, USA
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Ghebremicael SB, Hasenstein JR, Lamont SJ. Association of interleukin-10 cluster genes and Salmonella response in the chicken. Poult Sci 2008; 87:22-6. [PMID: 18079445 DOI: 10.3382/ps.2007-00259] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2023] Open
Abstract
Salmonella enteritidis lipopolysaccharide stimulates interleukin 10 (IL10) gene expression in chickens. Four genes in the IL10 cluster [polymeric immunoglobulin receptor (PIGR), interleukin 10 (IL10), map kinase-activated protein kinase 2 (MAPKAPK2), and ligatin (LGTN)] plus dual-specificity tyrosine-(Y)-phosphorylation regulated kinase1A (DYRK1A) were investigated using the F(8) generation of 2 related advanced intercross lines (AIL). The AIL were generated by crossing outbred broilers with dams of 2 highly inbred lines (Leghorn and Fayoumi). Intercrossing continued within the 2 dam lines. The F(8) chicks (n = 132) were intraesophageally inoculated at 1 d with S. enteritidis. At d 7 or 8, both spleen tissue and cecal contents were cultured to quantify S. enteritidis load. The F(8) population was genotyped for one single nucleotide polymorphism (SNP) per gene by using a multiplexed SNaPshot assay. Association of gene SNP with S. enteritidis bacterial burden was analyzed by the GLM. The MAPKAPK2 and IL10 genes were highly (P < 0.001) associated with S. enteritidis burden in spleen tissue and cecal luminal content. Suggestive associations (P < 0.05) of PIGR with spleen tissue and cecal content were found. The results suggest that SNP in MAPKAPK2 and IL10 were strongly associated with Salmonella burden and may be valuable in generating resistant birds by marker-assisted selection.
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Affiliation(s)
- S B Ghebremicael
- Department of Animal Science, Iowa State University, Ames, IA 50011, USA
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Schindler JF, Monahan JB, Smith WG. p38 pathway kinases as anti-inflammatory drug targets. J Dent Res 2007; 86:800-11. [PMID: 17720847 DOI: 10.1177/154405910708600902] [Citation(s) in RCA: 181] [Impact Index Per Article: 10.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023] Open
Abstract
Mitogen-activated protein kinases (MAPK) are intracellular signaling molecules involved in cytokine synthesis. Several classes of mammalian MAPK have been identified, including extracellular signal-regulated kinase, c-jun N-terminal kinase, and p38 MAP kinase. p38alpha is a key MAPK involved in tumor necrosis factor alpha and other cytokine production, as well as enzyme induction (cyclooxygenase-2, inducible nitric oxide synthase, and matrix metalloproteinases) and adhesion molecule expression. An understanding of the broad biologic and pathophysiological roles of p38 MAPK family members has grown significantly over the past decade, as has the complexity of the signaling network leading to their activation. Downstream substrates of MAPK include other kinases (e.g., mitogen-activated protein-kinase-activated protein kinase 2) and factors that regulate transcription, nuclear export, and mRNA stability and translation. The high-resolution crystal structure of p38alpha has led to the design of selective inhibitors that have good pharmacological activity. Despite the strong rationale for MAPK inhibitors in human disease, direct proof of concept in the clinic has yet to be demonstrated, with most compounds demonstrating dose-limiting adverse effects. The role of MAPK in inflammation makes them attractive targets for new therapies, and efforts are continuing to identify newer, more selective inhibitors for inflammatory diseases.
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Affiliation(s)
- J F Schindler
- Pfizer Global Research and Development, Chesterfield, MO 63017, USA
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Kervinen J, Ma H, Bayoumy S, Schubert C, Milligan C, Lewandowski F, Moriarty K, Desjarlais RL, Ramachandren K, Wang H, Harris CA, Grasberger B, Todd M, Springer BA, Deckman I. Effect of construct design on MAPKAP kinase-2 activity, thermodynamic stability and ligand-binding affinity. Arch Biochem Biophys 2006; 449:47-56. [PMID: 16620770 DOI: 10.1016/j.abb.2006.03.018] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2005] [Revised: 03/10/2006] [Accepted: 03/14/2006] [Indexed: 11/26/2022]
Abstract
MAPK-activated protein kinase-2 (MAPKAPK2) regulates the synthesis of tumor necrosis factor and other cytokines and is a potential drug target for inflammatory diseases. Five protein constructs were produced in 4-10mg quantities per liter of culture media using baculovirus-infected insect cells and characterized for kinase activity, thermal stability, and ligand-binding affinity. Compared to construct 1-370, removal of the C-terminal autoinhibitory peptide in 1-338 resulted in a destabilized but partially active nonphosphorylated enzyme; phosphorylation of 1-338 by p38alpha further increased activity 12-fold. A putative constitutively active mutant, 1-370/T222E/T334E, was 6.3-fold less active than phosphorylated 1-370. ThermoFluor, an equilibrium ligand-binding assay, was used to measure nucleotide analogue affinity for various constructs. Binding of phosphorylated nucleotides was Mg(2+)-dependent. Residues 1-40 were required for high-affinity binding of ADP, ATPgammaS, staurosporine, and K252a. A mutation M138A rendered 1-370 susceptible to p38-inhibitors SB-203580 and SB-202190 with IC50 values of 17.4 and 14.1 microM, respectively. Taken together, these studies provide information on the mechanism of ligand-binding to MAPKAPK2 that can be used in the search for selective small-molecule inhibitors.
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Affiliation(s)
- Jukka Kervinen
- Johnson & Johnson Pharmaceutical Research and Development, L.L.C., 665 Stockton Drive, Exton, Pennsylvania 19341, USA.
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Liu YH, Wang D, Rhaleb NE, Yang XP, Xu J, Sankey SS, Rudolph AE, Carretero OA. Inhibition of p38 mitogen-activated protein kinase protects the heart against cardiac remodeling in mice with heart failure resulting from myocardial infarction. J Card Fail 2005; 11:74-81. [PMID: 15704068 DOI: 10.1016/j.cardfail.2004.04.004] [Citation(s) in RCA: 48] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
BACKGROUND Mitogen-activated protein kinases (MAPKs) have emerged as an important pathophysiologic regulator during the development of heart failure (HF). p38 MAPK activity is elevated in cardiac hypertrophy and HF. We used a mouse model of myocardial infarction (MI) to test the hypotheses that (1) inhibition of p38 MAPK activity may improve cardiac function and remodeling after myocardial infarction (MI) and (2) coadministration of a p38 inhibitor (p38i) and an angiotensin-converting enzyme inhibitor (ACEI) may provide only limited further cardioprotection in this model. METHODS AND RESULTS MI was induced in C57BL/6J mice by ligating the left anterior descending coronary artery and then either left untreated or treated with a p38i (SC-409, 30 mg/kg/day in chow), ACEI (enalapril, 20 mg/kg in drinking water), or p38i plus ACEI for 12 weeks. Echocardiography was performed and systolic blood pressure measured before MI and weekly thereafter. At the end of the study, interstitial collagen fraction (ICF) and myocyte cross-sectional area (MCSA) were examined histologically. We found that p38i significantly increased left ventricular ejection fraction and cardiac output and decreased left ventricular area at diastole, ICF, and MCSA. ACEi and p38i each had similar beneficial effects in this mouse model of HF produced by a large MI. Coadministration of p38i and ACEi did not provide any additional benefit. CONCLUSION Our data suggest that inhibition of p38 MAPK provides significant cardioprotection in mice with HF post-MI.
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Affiliation(s)
- Yun-He Liu
- Hypertension and Vascular Research Division, Department of Internal Medicine, Henry Ford Hospital, Detroit, MI 48202-2689, USA
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Ercan A, West CM. Kinetic analysis of a Golgi UDP-GlcNAc:polypeptide-Thr/Ser N-acetyl-alpha-glucosaminyltransferase from Dictyostelium. Glycobiology 2005; 15:489-500. [PMID: 15616122 DOI: 10.1093/glycob/cwi034] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
Mucin-type O-glycosylation in Dictyostelium is initiated in the Golgi by a UDP-GlcNAc:polypeptide-Thr/Ser N-acetyl-alpha-glucosaminyltransferase (Dd-pp alphaGlcNAcT2) whose sequence is distantly related to the sequences of animal polypeptide-Thr/Ser N-acetyl-alpha-galactosaminyltransferases, such as murine Mm-pp alphaGalNAcT1. To evaluate the significance of this similarity, highly purified Dd-pp alphaGlcNAcT2 was assayed using synthetic peptides derived from known substrates. Dd-pp alphaGlcNAcT2 strongly prefers UDP-GlcNAc over UDP-GalNAc, preferentially modifies the central region of the peptide, and modifies Ser in addition to Thr residues. Initial velocity measurements performed over a matrix of UDP-GlcNAc donor and peptide acceptor concentrations indicate that the substrates bind to the enzyme in ordered fashion before the chemical conversion. Substrate inhibition exerted by a second peptide, and the pattern of product inhibition exerted by UDP, suggest that UDP-GlcNAc binds first and the peptide binds second, consistent with data reported for Mm-pp alphaGalNAcT1. Two selective competitive inhibitors of Mm-pp alphaGalNAcT1, retrieved from a screen of neutral-charge uridine derivatives, also inhibit Dd-pp alphaGlcNAcT1 competitively with only slightly less efficacy. Inhibition is specific for Dd-pp alphaGlcNAcT2 relative to two other Dictyostelium retaining glycosyltransferases. These data support a phylogenetic model in which the alphaGlcNAcT function in unicellular eukaryotes converted to an alphaGalNAcT function in the metazoan ortholog while conserving a similar reaction mechanism and active site architecture.
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Affiliation(s)
- Altan Ercan
- Department of Biochemistry and Molecular Biology, Oklahoma Center for Medical Glycobiology, University of Oklahoma Health Sciences Center, 940 Stanton L. Young Blvd., BMSB 937, Oklahoma City, OK 73104, USA
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Srinivasan J, Cload ST, Hamaguchi N, Kurz J, Keene S, Kurz M, Boomer RM, Blanchard J, Epstein D, Wilson C, Diener JL. ADP-specific sensors enable universal assay of protein kinase activity. ACTA ACUST UNITED AC 2004; 11:499-508. [PMID: 15123244 DOI: 10.1016/j.chembiol.2004.03.014] [Citation(s) in RCA: 75] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/21/2003] [Revised: 01/09/2004] [Accepted: 01/12/2004] [Indexed: 11/18/2022]
Abstract
Two molecular sensors that specifically recognize ADP in a background of over 100-fold molar excess of ATP are described. These sensors are nucleic-acid based and comprise a general method for monitoring protein kinase activity. The ADP-aptamer scintillation proximity assay is configured in a single-step, homogeneous format while the allosteric ribozyme (RiboReporter) sensor generates a fluorescent signal upon ADP-dependent ribozyme self-cleavage. Both systems perform well when configured for high-throughput screening and have been used to rediscover a known protein kinase inhibitor in a high-throughput screening format.
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Rich RL, Myszka DG. A survey of the year 2002 commercial optical biosensor literature. J Mol Recognit 2004; 16:351-82. [PMID: 14732928 DOI: 10.1002/jmr.649] [Citation(s) in RCA: 70] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
We have compiled 819 articles published in the year 2002 that involved commercial optical biosensor technology. The literature demonstrates that the technology's application continues to increase as biosensors are contributing to diverse scientific fields and are used to examine interactions ranging in size from small molecules to whole cells. Also, the variety of available commercial biosensor platforms is increasing and the expertise of users is improving. In this review, we use the literature to focus on the basic types of biosensor experiments, including kinetics, equilibrium analysis, solution competition, active concentration determination and screening. In addition, using examples of particularly well-performed analyses, we illustrate the high information content available in the primary response data and emphasize the impact of including figures in publications to support the results of biosensor analyses.
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Affiliation(s)
- Rebecca L Rich
- Center for Biomolecular Interaction Analysis, University of Utah, Salt Lake City, UT 84132, USA
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