interacts_with DB00864?
Interaction of tacrolimus(FK506) and its metabolites with FKBP and calcineurin . DB00864 (FK506) is a strong immuno-suppressant and shows its activity through inhibiting P60568 mRNA transcription by forming pentameric complex with intracellular receptor ( FK506 binding protein 12 kDa or P62942 ) , Ca2+ , calmodulin , and calcineurin . Here , we report the binding activity to P62942 , the pentameric complex formation and Con-A response inhibiting activities of 7 metabolites . C15-demethylated metabolite(M-3) needed higher quantity to compete in Con-A assay and in pentamer formation assay , although it binds more strongly to P62942 . The result suggests that the ability to form a pentameric complex is not a two step reaction with the first binding to P62942 , but a single step reaction by components for the pentamer formation . Structure and function of eritadenine and its 3-deaza analogues : potent inhibitors of S-adenosylhomocysteine hydrolase and hypocholesterolemic agents . d- DB03769 ( DEA ) is a potent inhibitor of S-adenosyl-l-homocysteine hydrolase ( P23526 ) and has hypocholesterolemic activity . We have hypothesized that 3-deaza-DEA ( P01024 -DEA ) and its analogues retain high level of P23526 inhibitory activity and have resistance to deamination and glycosidic bond hydrolysis in vivo . Such P01024 -DEA analogues would have much higher hypocholesterolemic activity . P01024 -DEA , and its methyl ester ( P01024 -OMeDEA ) and its methyl amido ( P01024 -NMeDEA ) were synthesized to examine their P23526 inhibitory and hypocholesterolemic activities . A crystal structure of P23526 containing P01024 -DEA was determined and confirmed that DEA and P01024 -DEA bound to the same site of P23526 with the same binding mode . The P23526 inhibitory activities of P01024 -DEA ( K(I)=1.5 microM ) and P01024 -OMeDEA ( K(I)=1.5 microM ) are significantly lower than that of DEA ( K(I)=30 nM ) , while rats fed by P01024 -DEA and P01024 -OMeDEA decrease the total plasma cholesterol and phospholipids by 36-40 % and 23 % , respectively , which is similar to the level of reductions ( 42 % and 27 % ) by DEA . P01024 -NMeDEA lost most of the P23526 inhibitory activity ( K(I)=30 microM ) and dietary P01024 -NMeDEA does not decrease cholesterol and phospholipid in plasma but decreases the triacylglycerol level by 16 % . DEA and P01024 -DEA analogues are neither substrates nor inhibitors of adenosine deaminase . Effects of antihistamines on the function of human α7-nicotinic acetylcholine receptors . Effects of the histamine H₁ receptor ( P35367 ) antagonists ( antihistamines ) , promethazine ( PMZ ) , orphenadrine ( ORP ) , chlorpheniramine ( CLP ) , DB06691 ( PYR ) , diphenhydramine ( DPH ) , citerizine ( CTZ ) , and triprolidine ( TRP ) on the functional properties of the cloned α7 subunit of the human nicotinic acetylcholine receptor expressed in Xenopus oocytes were investigated . Antihistamines inhibited the α7-nicotinic acetylcholine receptor in the order PYR > CLP > TRP > PMZ > ORP≥DPH≥CTZ . Among the antihistamines , PYR showed the highest reversible inhibition of acetylcholine ( 100 µM ) -induced responses with IC₅₀ of 6.2 µM . PYR-induced inhibition was independent of the membrane potential and could not be reversed by increasing the concentration of acetylcholine . Specific binding of [ ¹²⁵I ] α-bungarotoxin , a selective antagonist for α7-nicotinic acetylcholine receptor , was not changed in the presence of PYR suggesting a non-competitive inhibition of nicotinic receptors . In line with functional experiments , docking studies indicated that PYR can potentially bind allosterically with the α7 transmembrane domain . Our results indicate that the H₂-H₄ receptor antagonists tested in this study ( 10 µM ) showed negligible inhibition of α7-nicotinic acetylcholine receptors . On the other hand , H₁ receptor antagonists inhibited the function of human α7-nicotinic acetylcholine receptor , with varying potencies . These results emphasize the importance of α7-nicotinic acetylcholine receptor for future pharmacological/toxicological profiling . [ The importance of determination of interleukin-10 in the blood of patients with systemic lupus erythematosus ] . BACKGROUND : Hitherto , not very numerous investigations provided so far only few often controversial findings on the importance of interleukin-10 ( P22301 ) in systemic lupus erythematosus ( SLE ) . The objective of the present investigation was to assess whether there exist practically applicable relations between the serum level of P22301 , clinical and laboratory indicators of activity of the disease and serum levels of selected cytokines or their soluble receptors . METHODS AND RESULTS : The authors analyzed a group of 23 patients with SLE ( 23 women and 1 man , median age 37 years ) . P22301 and other cytokines were examined by the ELISA method , the clinical activity of the disease was evaluated by the ECLAM system ( European Consensus Lupus Activity Measurement ) . Elevated P22301 values ( > 5 pg/ml ) were assessed in 10 ( 43 % ) patients . Correlation analysis ( Pearson 's test , p < 0.05 ) revealed statistically significant relations between P22301 levels and the activity of the disease , values of antibody levels against dsDNA and levels of the soluble receptor P60568 ( sIL-2R ) in serum . Conversely , no relationship was revealed between values of P22301 and values of P01024 and C4 complement components , IL-1 , P60568 , P05231 , sIL-6R , P01375 , sTNFR-alpha and P27352 -gamma . CONCLUSIONS : Elevated P22301 serum levels in patients with SLE did not have , with the exception of the index of clinical activity of the disease , antibodies against dsDNA and sIL-2R any statistically significant relations to laboratory indicators of disease activity and levels of selected cytokines and their soluble receptors . Korean Red DB01404 Extract Attenuates 3-Nitropropionic Acid-Induced Huntington's-Like Symptoms . Korean red ginseng ( KRG ) possesses neuroprotective activity . However , the potential neuroprotective value of KRG for the striatal toxicity is largely unknown . We investigated whether KRG extract ( KRGE ) could have a neuroprotective effect in a 3-nitropropionic acid- ( 3-NP ) induced ( i.p. ) Huntington 's disease ( HD ) model . KRGE ( 50 , 100 , and 250 mg/kg/day , p.o. ) was administrated 10 days before 3-NP injection ( pre-administration ) , from the same time with 3-NP injection ( co-administration ) , or from the peak point of neurological impairment by 3-NP injection ( post-administration ) . Pre-administration of KRGE produced the greatest neuroprotective effect in this model . Pre-administration of KRGE significantly decreased 3-NP-induced neurological impairment , lethality , lesion area , and neuronal loss in the 3-NP-injected striatum . KRGE attenuated microglial activation and phosphorylation of mitogen-activated protein kinases ( MAPKs ) and nuclear factor-kappa B ( NF-κB ) signal pathway . KRGE also reduced the level of mRNA expression of tumor necrosis factor-alpha , interleukin- ( IL- ) 1β , P05231 , inducible nitric oxide synthase , and OX-42 . Interestingly , the intrathecal administration of SB203580 ( a p38 inhibitor ) or PD98059 ( an inhibitor of MAPK Kinase , MEK ) increased the survival rate in the 3-NP-induced HD model . Pre-administration of KRGE may effectively inhibit 3-NP-induced striatal toxicity via the inhibition of the phosphorylation of MAPKs and NF-κB pathways , indicating its therapeutic potential for suppressing Huntington's-like symptoms . Gene-based vaccines and immunotherapeutics . DNA vaccines , comprised of plasmid DNA encoding proteins from pathogens , allergens , and tumors , are being evaluated as prophylactic vaccines and therapeutic treatments for infectious diseases , allergies , and cancer ; plasmids encoding normal human proteins are likewise being tested as vaccines and treatments for autoimmune diseases . Examples of in vivo prophylaxis and immunotherapy , based on different types of immune responses ( humoral and cellular ) , in a variety of disease models and under evaluation in early phase human clinical trials are presented . Viral vectors continue to show better levels of expression than those achieved by DNA plasmid vectors . We have focused our clinical efforts , at this time , on the use of recombinant viral vectors for both vaccine as well as cytokine gene transfer studies . We currently have four clinical programs in cancer immunotherapy . Two nonspecific immunotherapy programs are underway that apply adenoviral vectors for the transfer of cytokine genes into tumors in situ . An adenovirus-IFN gamma construct ( TG1042 ) is currently being tested in phase II clinical trials in cutaneous lymphoma . A similar construct , adenovirus- P60568 ( TG1024 ) , also injected directly into solid tumors , is currently being tested in patients with solid tumors ( about one-half of which are melanoma ) . Encouraging results are seen in both programs . Two cancer vaccine immunotherapy programs focus on two cancer-associated antigens : human papilloma virus E6 and E7 proteins and the epithelial cancer-associated antigen P15941 . Both are encoded by a highly attenuated vaccinia virus vector [ modified vaccinia Ankara ( MVA ) ] and both are coexpressed with P60568 . Encouraging results seen in both of these programs are described . Displacement of Q01826 -bound histone deacetylase 1 corepressor by the human immunodeficiency virus type 1 transactivator induces expression of interleukin-2 and its receptor in T cells . One hallmark of human immunodeficiency virus type 1 ( HIV-1 ) infection is the dysregulation of cytokine gene expression in T cells . Transfection of T cells with human T-cell leukemia type 1 or 2 transactivator results in the induction of the T-cell-restricted cytokine interleukin-2 ( P60568 ) and its receptor ( IL-2Ralpha ) . However , no T-cell-specific factor(s) has been directly linked with the regulation of P60568 and IL-2Ralpha transcription by influencing the promoter activity . Thymocytes from Q01826 ( special AT-rich sequence binding protein 1 ) knockout mice have been shown to ectopically express IL-2Ralpha , suggesting involvement of Q01826 in its negative regulation . Here we show that Q01826 , a T-cell-specific global gene regulator , binds to the promoters of human P60568 and IL-2Ralpha and recruits histone deacetylase 1 ( Q13547 ) in vivo . Q01826 also interacts with Tat in HIV-1-infected T cells . The functional interaction between HIV-1 Tat and Q01826 requires its PDZ-like domain , and the binding of the Q13547 corepressor occurs through the same . Furthermore , Tat competitively displaces Q13547 that is bound to Q01826 , leading to increased acetylation of the promoters in vivo . Transduction with Q01826 interaction-deficient soluble Tat ( Tat 40-72 ) and reporter assays using a transactivation-negative mutant ( C22G ) of Tat unequivocally demonstrated that the displacement of Q13547 itself is sufficient for derepression of these promoters in vivo . These results suggest a novel mechanism by which HIV-1 Tat might overcome Q01826 -mediated repression in T cells . P40189 -linked signal transduction promotes the differentiation and maturation of dendritic cells . In order to explore the role of P40189 -linked signal transduction in the differentiation and maturation of dendritic cells ( DC ) , the mAb , B- P28222 , an agonist of P40189 , was used for the activation of P40189 on DC . The effects of cytokines and of anti- P40189 mAb on the proliferation of DC , and their expression of IL-12 and P33681 ( P33681 -1 ) by DC were evaluated . DC differentiating from peripheral blood mononuclear cells did not express the P05231 receptor alpha chain , but expressed P40189 . Anti- P40189 mAb promoted the proliferation of DC , induced by P05112 and granulocyte macrophage colony stimulating factor ( GM- P04141 ) , by up-regulating the GM- P04141 receptor on DC . DC induced by P40189 mAb and cytokines expressed DC-derived CC chemokine , as measured by RT-PCR . Induced DC also stimulated strong proliferation of autologous T cells in mixed lymphocyte reaction since an up-regulated expression of IL-12 and P33681 ( P33681 -1 ) was observed in DC activated by anti- P40189 mAb . Thus , P40189 signal transduction is important for the differentiation and maturation of DC . Synteny mapping in the bovine : genes from human chromosome 4 . Genes homologous to those located on human chromosome 4 ( HSA4 ) were mapped in the bovine to determine regions of syntenic conservation among humans , mice , and cattle . Previous studies have shown that two homologs of genes on HSA4 , Q96G03 and P28838 , are located in bovine syntenic group U15 ( chromosome 6 ) . The homologous mouse genes , Pgm-1 and Pep-7 , are on MMU5 . Using a panel of bovine x hamster hybrid somatic cells , we have assigned homologs of 11 additional HSA4 loci to their respective bovine syntenic groups . D4S43 , D4S10 , P09417 , P01591 , P00325 , P10721 , and IF were assigned to syntenic group U15 . This syntenic arrangement is not conserved in the mouse , where D4s43 , D4s10 , Qdpr , and Igj are on MMU5 while Adh-2 is on MMU3 . P60568 , P02675 , P02679 , and P03951 , which also reside on MMU3 , were assigned to bovine syntenic group U23 . These data suggest that breaks and/or fusions of ancestral chromosomes carrying these genes occurred at different places during the evolution of humans , cattle , and mice . Integrin alpha5-induced P00533 activation by prothrombin triggers hepatocyte apoptosis via the JNK signaling pathway . We have previously shown that prothrombin , a blood coagulation factor , can cause an inhibition of DNA synthesis in normal rat hepatocytes . To explore the mechanisms of this prothrombin action , we examined its effects on the activation of fibronectin receptor integrin alpha5 , since fibronectin was found to be degraded by prothrombin actions in primary hepatocyte cultures . We found that prothrombin treatment of rat hepatocytes without addition of any growth factor induced tyrosine phosphorylation of integrin alpha5 and interaction of integrin alpha5 with epidermal growth factor receptor ( P00533 ) , leading to P00533 tyrosine phosphorylation at tyrosine residues DB00135 -845 and DB00135 -1173 . P00533 tyrosine phosphorylation triggered phosphorylation of its down-stream target Shc and the activation of the c-Jun N-terminal kinase ( JNK ) pathway . P00734 also induced hepatocyte apoptosis , a change in cell shape and activation of caspase 3 pathway . The JNK pathway is most likely involved in prothrombin-induced hepatocyte apoptosis , because pre-treatment of hepatocytes with JNK kinase inhibitor II ( SP600125 ) antagonized these prothrombin actions . The data suggest that integrin-related P00533 activation by prothrombin can induce cell growth inhibition and apoptosis via an P00533 -JNK signaling pathway . Meta-analysis of oral DB00669 therapy for migraine : number needed to treat and relative cost to achieve relief within 2 hours . OBJECTIVE : To determine the cost-effectiveness of the P28222 /1D agonists , or triptans , in the acute treatment of migraine . METHODS : To determine the cost-effectiveness of the triptans , a meta-analysis was conducted of the efficacy data from 27 oral DB00669 trials , using the endpoint of " pain-free " status within 2 hours after initial dosing as the indicator of efficacy . Efficacy data were used to determine the number needed to treat ( Q13423 ) to achieve pain-free status in 1 patient within 2 hours postdose and then applied the per-dose costs for each DB00669 to the Q13423 values . RESULTS : Rizatriptan 10 mg and almotriptan 12.5 mg were the most cost-effective of the triptans , costing $ 48.34 and $ 48.57 US dollars , respectively , to achieve pain-free status in 1 patient within 2 hours postdose . DB00998 2.5 mg was the most costly , with a cost-effective ratio of $ 162.49 US dollars . All other triptans fell between these extremes : zolmitriptan 5 mg ( $ 65.18 US dollars ) , sumatriptan 100 mg ( $ 70.83 US dollars ) , sumatriptan 50 mg ( $ 75.67 US dollars ) , zolmitriptan 2.5 mg ( $ 78.74 US dollars ) , and naratriptan 2.5 mg ( $ 141.43 US dollars ) , in decreasing order of cost-effectiveness . CONCLUSION : Using an Q13423 analysis , the least-costly drugs to achieve migraine cure within 2 hours are rizatriptan 10 mg and almotriptan 12.5 mg . From a population health perspective , the lower acquisition cost of almotriptan 12.5 mg allows for effective treatment of more patients than rizatriptan 10 mg for no additional medication cost . Generation of Epstein-Barr virus-specific cytotoxic T lymphocytes resistant to the immunosuppressive drug tacrolimus ( FK506 ) . Adoptive transfer of autologous Epstein-Barr virus-specific cytotoxic T lymphocytes ( EBV-CTLs ) to solid organ transplant ( SOT ) recipients has been shown safe and effective for the treatment of EBV-associated posttransplantation lymphoproliferative disorders ( PTLDs ) . SOT recipients , however , require the continuous administration of immunosuppressive drugs to prevent graft rejection , and these agents may significantly limit the long-term persistence of transferred EBV-CTLs , precluding their use as prophylaxis . DB00864 ( FK506 ) is one of the most widely used immunosuppressive agents in SOT recipients , and its immunosuppressive effects are largely dependent on its interaction with the 12-kDa FK506-binding protein ( P62942 ) . We have knocked down the expression of P62942 in EBV-CTLs using a specific small interfering RNA ( siRNA ) stably expressed from a retroviral vector and found that P62942 -silenced EBV-CTLs are FK506 resistant . These cells continue to expand in the presence of the drug without measurable impairment of their antigen specificity or cytotoxic activity . We confirmed their FK506 resistance and anti-PTLD activity in vivo using a xenogenic mouse model , suggesting that the proposed strategy may be of value to enhance EBV-specific immune surveillance in patients at high risk of PTLD after transplantation . Role of xanthine oxidoreductase and NAD(P)H oxidase in endothelial superoxide production in response to oscillatory shear stress . Oscillatory shear stress occurs at sites of the circulation that are vulnerable to atherosclerosis . Because oxidative stress contributes to atherosclerosis , we sought to determine whether oscillatory shear stress increases endothelial production of reactive oxygen species and to define the enzymes responsible for this phenomenon . Bovine aortic endothelial cells were exposed to static , laminar ( 15 dyn/cm2 ) , and oscillatory shear stress ( +/-15 dyn/cm2 ) . Oscillatory shear increased superoxide ( O2.- ) production by more than threefold over static and laminar conditions as detected using electron spin resonance ( P03372 ) . This increase in O2*- was inhibited by oxypurinol and culture of endothelial cells with tungsten but not by inhibitors of other enzymatic sources . DB05262 also prevented H2O2 production in response to oscillatory shear stress as measured by dichlorofluorescin diacetate and Amplex Red fluorescence . DB02134 -dependent O2*- production was increased in homogenates of endothelial cells exposed to oscillatory shear stress . This was associated with decreased xanthine dehydrogenase ( P47989 ) protein levels and enzymatic activity resulting in an elevated ratio of xanthine oxidase ( XO ) to P47989 . We also studied endothelial cells lacking the p47phox subunit of the NAD(P)H oxidase . These cells exhibited dramatically depressed O2*- production and had minimal XO protein and activity . Transfection of these cells with p47phox restored XO protein levels . Finally , in bovine aortic endothelial cells , prolonged inhibition of the NAD(P)H oxidase with apocynin decreased XO protein levels and prevented endothelial cell stimulation of O2*- production in response to oscillatory shear stress . These data suggest that the NAD(P)H oxidase maintains endothelial cell XO levels and that XO is responsible for increased reactive oxygen species production in response to oscillatory shear stress . DB08875 ( DB05153 ) for the treatment of locally advanced or metastatic progressive medullary thyroid cancer . DB08875 ( DB05153 ) is an oral multiple receptor tyrosine kinase inhibitor manufactured by Exelixis Inc. , CA , USA . It mainly inhibits three tyrosine kinase receptors : MET , P35968 and P07949 . In both preclinical and clinical studies it has been shown to inhibit tumor angiogenesis , invasiveness and metastases . The most frequent side effects are fatigue , diarrhea , decreased appetite , nausea , weight loss and palmar-plantar erythrodysesthesia . A Phase III clinical trial ( EXAM study ) of DB05153 versus placebo in advanced and progressive medullary thyroid cancer showed a 28 versus 0 % overall response rate and a progression-free survival of 11.2 versus 4.0 months ( hazard ratio : 0.28 ; 95 % CI : 0.19-0.40 ; p < 0.0001 ) in patients treated with cabozantinib and placebo , respectively . The drug has been approved by the US FDA for the treatment of advanced/progressive metastatic medullary thyroid cancer in the USA . The P15941 is now evaluating its approval in Europe . Forced dimerization increases the activity of Δ P00533 /EGFRvIII and enhances its oncogenicity . Delta epidermal growth factor receptor ( Δ P00533 ) , an in-frame deletion mutant of the extracellular ligand-binding domain , which occurs in about 30 % of glioblastoma , is a potent oncogene that promotes tumor growth and progression . The signaling of Δ P00533 is ligand-independent and low intensity , allowing it to evade the normal mechanisms of internalization and degradation by the endocytic machinery and hence is persistent . The basis of the oncogenic potential of Δ P00533 remains incompletely understood , including whether dimerization plays an important role in its signal and whether its oncogenic potential is dependent on its relatively low intensity , when compared with the acutely activated wild-type receptor . To examine these two important questions , we have generated a chimeric Δ P00533 that allows forced dimerization via domains derived from variants of the P62942 protein that are brought together by FK506 derivatives . Forced dimerization of chimeric Δ P00533 significantly increased the intensity of its signal , as measured by receptor phosphorylation levels , suggesting that the naturally occurring Δ P00533 does not form strong or stable dimers as part of its low level signal . Interestingly , the increased activity of dimerized , chimeric Δ P00533 did not promote receptor internalization , implying that reduced rate of endocytic downregulation of Δ P00533 is an inherent characteristic . Significantly , forced dimerization enhanced the oncogenic signal of the receptor , implying that the Δ P00533 is a potent oncogene despite , not because of its low intensity . Interpretation of point-of-care INR results in patients treated with dabigatran . BACKGROUND : Point-of-care devices for measurement of the international normalized ratio ( INR ) are commonly used to monitor therapy and maintain therapeutic levels of anticoagulation in patients treated with vitamin K antagonists . DB06695 , a new oral , reversible direct thrombin inhibitor approved for stroke prevention in patients with atrial fibrillation does not require routine coagulation monitoring . However , case reports have identified falsely elevated point-of-care INR levels in patients treated with dabigatran using one of these devices ( Hemochron ) . This in vitro study was designed to verify this issue . METHODS : We compared INR levels in whole blood and plasma using a Hemochron Jr . Signature+ point-of-care device ( International Technidyne Corporation , Edison , NJ ) with routine laboratory monitoring , using blood from healthy volunteers that was spiked with increasing concentrations of dabigatran . RESULTS : P00734 time and INR levels were increased about 2- to 4-fold with the point-of-care device compared with laboratory measures across the plasma dabigatran concentration range 50-1400 ng/mL . At plasma concentrations of dabigatran likely to be observed in patients , at a dose of 150 mg twice daily ( 60-275 ng/mL ) , whole blood point-of-care INR values increased from 1.7 to 4.0 , versus 1.1 to 1.5 measured with the laboratory coagulometer . Similar differences in prothrombin time were observed in plasma samples . CONCLUSIONS : INR levels in patients taking dabigatran are substantially higher using a Hemochron Jr. point-of-care device compared with laboratory values . We discourage the use of these devices specifically , as well as the use of the INR in general , for measuring the anticoagulant effect of dabigatran . Oxidation of alcohols and reduction of aldehydes derived from methyl- and dimethylpyrenes by cDNA-expressed human alcohol dehydrogenases . Some methylated pyrenes can form DNA adducts in rat tissues after benzylic hydroxylation and sulpho conjugation . However , oxidation of the intermediate alcohols to carboxylic acids is an important competing pathway leading to detoxification . We previously showed that co-administration of ethanol or DB01213 strongly enhances DNA adduct formation by 1-hydroxymethylpyrene , indicating an involvement of alcohol dehydrogenases ( ADHs ) in the detoxification . This mechanism may be involved in the observed synergism of smoking and alcohol consumption in certain human cancers . In a preceding study , cDNA-expressed human P00325 efficiently oxidised 1- , 2- and 4-hydroxymethylpyrene ; these reactions were inhibited in the presence of ethanol or DB01213 . Here we report that P00326 , P00326 and P08319 also show substantial activity towards these substrates and two further congeners , 1-hydroxymethyl-6-methylpyrene and 1-hydroxymethyl-8-methylpyrene . All four DB00067 forms also catalysed the reverse reaction , implying that the aldehydes have to be sequestered by other enzymes , such as aldehyde dehydrogenases , for final detoxification . P00326 and P08319 activities towards hydroxymethylpyrenes were more strongly inhibited in the presence of ethanol and DB01213 than those of P00325 . P00326 was only inhibited at very high concentrations of the modulators . In conclusions , several human ADHs are capable of detoxifying benzylic alcohols of alkylated polycyclic aromatic hydrocarbons . However , some competing substrates and inhibitors may affect all these redundant detoxification systems , although to various extents . Induction of differentiation and apoptosis in leukaemic cell lines by the novel benzamide family histone deacetylase 2 and 3 inhibitor MI-192 . Histone deacetylase inhibitors ( HDACIs ) are in advanced clinical development as cancer therapeutic agents . However , first generation HDACIs such as butyrate and valproate are simple short chain aliphatic compounds with moieties resembling acetyl groups , and have a broad spectrum of activity against HDACs . More complex second generation HDACIs undergoing clinical trials , such as the benzamide group compounds MS-275 and DB05651 , are specific primarily for Q13547 and Q92769 . To expand the repertoire of available HDACIs and HDAC specificities we created a novel benzamide-based compound named MI-192 . When tested against purified recombinant HDACs , MI-192 had marked selectivity for the class I enzymes , Q92769 and O15379 . Screening in the NCI60 screen demonstrated that MI-192 had greatly enhanced efficacy against cells of leukaemic origin . When tested in culture against the acute myeloid leukaemic cell lines U937 , HL60 and Kasumi-1 , MI-192 induced differentiation and was cytotoxic through promotion of apoptosis . MI-192 therefore justifies further investigation and development as a potential therapeutic agent for use in leukaemia . Human epidermal Langerhans ' cells are targets for the immunosuppressive macrolide tacrolimus ( FK506 ) . BACKGROUND : The immunosuppressive macrolide tacrolimus ( FK506 ) has been shown to inhibit allergic contact dermatitis in animal models as well as in human beings . More recently , successful treatment of atopic dermatitis with an ointment containing tacrolimus has been reported . OBJECTIVES : We explored the effects of this compound on epidermal Langerhans ' cells ( LCs ) , which are known to play an important pathophysiologic role in inflammatory skin diseases . METHODS : The expression of the intracellular FK506 binding protein ( P62942 ) was monitored on freshly isolated and cultured epidermal LCs . Phenotyping and functional exploration of LCs treated with different concentrations of tacrolimus and beta-methasone valerate ( betaMv ) were performed . RESULTS : P62942 is expressed in freshly isolated LCs but is lost while they are maturating into mature dendritic cells . DB00864 inhibited the expression of IL-2R ( CD25 ) and of the costimulatory molecules P33681 ( P33681 .1 ) and P25942 . Expression of MHC class I and II was also affected , whereas P42081 ( P33681 .2 ) expression was not altered . In contrast , betaMv strongly increased the expression of CD25 . Paradoxically , while decreasing P25942 and MHC class I expression , betaMv significantly increased the expression of MHC class II , P33681 , and P42081 on cultured LCs but impaired their allostimulatory activity . DB00864 was about 100 times more potent than betaMv at inhibiting LC stimulatory function . CONCLUSION : DB00864 can exert immunopharmacologic alterations on LCs , which may account , at least in part , for the therapeutic effect of this compound in eczematous skin diseases . The complex of FK506-binding protein 12 and FK506 inhibits calcineurin phosphatase activity and IgE activation-induced cytokine transcripts , but not exocytosis , in mouse mast cells . FK506 and cyclosporin A ( DB00091 ) are immunosuppressive agents that inhibit P60568 production by activated T cells , but only DB00091 inhibits IgE activation-induced cytokine transcripts in mouse P08700 -dependent , bone marrow-derived mast cells ( BMMC ) . We previously associated the resistance of BMMC to FK506 with a deficiency in the expression of FK506 binding protein ( FKBP ) 12 , a molecule that forms a complex with FK506 capable of inhibiting calcineurin phosphatase activity in vitro . In this report , we establish that P62942 mediates FK506 inhibition of both calcineurin phosphatase activity and IgE activation-induced cytokine transcripts in a Kirsten murine sarcoma virus-immortalized mast cell line that is P62942 deficient . Overexpression of P62942 by transfection enhanced the ability of FK506 to inhibit calcineurin phosphatase activity ( IC50 = 2 nM ) , compared with cells transfected with the expression vector alone ( IC50 > 30 nM ) . The IC50 value for FK506 inhibition of IgE activation-induced transcripts for P01375 decreased from 40 nM in vector control cells to 10 nM in P62942 transfectants . Similarly , the IC50 value for inhibition of P05231 transcripts decreased from > 1000 nM in vector control cells to 35 nM in P62942 transfectants . In contrast , activation-elicited release of the secretory granule mediator beta-hexosaminidase was only partially inhibited by FK506 at 1000 nM , regardless of the levels of P62942 expressed by the cells . Thus , P62942 is the dominant cytosolic protein that mediates FK506 inhibition of P01375 and P05231 transcripts . Regulation of Con A-dependent cytokine production from P01730 + and CD8+ T lymphocytes by autosecretion of histamine . OBJECTIVES : Previously we have shown that both P01730 + T cells and CD8+ T cells produce histamine when activated with Con A . The aim of this study was to examine whether cytokine production by these cells is regulated by autosecretion of histamine . MATERIALS : P01730 + and CD8+ T cells were separated from spleen cells of C57BL/6 mice and mice lacking the H1 receptor ( P35367 ) or P25021 , using anti- P01730 +- and anti-CD8+-coupled magnetic beads , respectively . RESULTS : Depletion of the P35367 resulted in decreases in the release of P60568 and P22301 from both P01730 + and CD8+ cells and increases in the release of P05112 from P01730 + T cells and P01579 from CD8+ cells . Mice lacking the P25021 showed up-regulation of P01579 secretion from CD8+ cells and of P05112 from P01730 + and CD8+ T cells . Release of P60568 and P22301 from P01730 + as well as CD8+ cells was down-regulated in these mice . Both P01730 + and CD8+ T cell fractions synthesized histamine , which was enhanced in the P35367 -deficient CD8+ T cells . Treatment of the cells with alpha-fluoromethyl-histidine , a specific inhibitor of HDC , or histaminase increased P01579 from CD8+ cells , whereas it had no appreciable effect on P05112 secretion from P01730 + cells . CONCLUSION : These results suggest that cytokine production by P01730 + and CD8+ T lymphocytes is regulated by autosecretion of histamine . DB02134 oxidase inhibitor tungsten prevents the development of atherosclerosis in ApoE knockout mice fed a Western-type diet . Hyperlipidemia enhances xanthine oxidase ( XO ) activity . XO is an important source of reactive oxygen species ( ROS ) . Since ROS are thought to promote atherosclerosis , we hypothesized that XO is involved in the development of atherosclerosis . ApoE(-/-) mice were fed a Western-type ( WD ) or control diet . In subgroups , tungsten ( 700 mg/L ) was administered to inhibit XO . XO is a secreted enzyme which is formed in the liver as xanthine dehydrogenase ( P47989 ) and binds to the vascular endothelium . High expression of P47989 was found in the liver and WD increased liver P47989 mRNA and P47989 protein expression . WD induced the conversion of P47989 to the radical-forming XO . Moreover , WD increased the hepatic expression of P25942 , demonstrating activation of hepatic cells . Aortic tissue of ApoE(-/-) mice fed a WD for 6 months exhibited marked atherosclerosis , attenuated endothelium-dependent relaxation to acetylcholine , increased vascular oxidative stress , and mRNA expression of the chemokine KC . Tungsten treatment had no effect on plasma lipids but lowered the plasma XO activity . In animals fed a control diet , tungsten had no effect on radical formation , endothelial function , or atherosclerosis development . In mice fed a WD , however tungsten attenuated the vascular superoxide anion formation , prevented endothelial dysfunction , and attenuated KC mRNA expression . Most importantly , tungsten treatment largely prevented the development of atherosclerosis in the aorta of ApoE(-/-) mice on WD . Therefore , tungsten , potentially via the inhibition of XO , prevents the development of endothelial dysfunction and atherosclerosis in ApoE(-/-) mice on WD .