interacts_with DB00333?
Distinct binding mode of multikinase inhibitor lenvatinib revealed by biochemical characterization . DB09078 is an oral multikinase inhibitor that selectively inhibits vascular endothelial growth factor ( P15692 ) receptors 1 to 3 and other proangiogenic and oncogenic pathway-related receptor tyrosine kinases . To elucidate the origin of the potency of lenvatinib in P15692 receptor 2 ( P35968 ) inhibition , we conducted a kinetic interaction analysis of lenvatinib with P35968 and X-ray analysis of the crystal structure of P35968 -lenvatinib complexes . Kinetic analysis revealed that lenvatinib had a rapid association rate constant and a relatively slow dissociation rate constant in complex with P35968 . Co-crystal structure analysis demonstrated that lenvatinib binds at its DB00171 mimetic quinoline moiety to the DB00171 binding site and to the neighboring region via a cyclopropane ring , adopting an DB00128 - DB00120 - DB00145 ( DFG ) - " in " conformation . These results suggest that lenvatinib is very distinct in its binding mode of interaction compared to the several approved P35968 kinase inhibitors . Characterization of the effect of chronic administration of a calcium-sensing receptor antagonist , DB05255 , on renal calcium excretion and serum calcium in postmenopausal women . Ronacaleret is an orally-active calcium-sensing receptor ( P41180 ) antagonist that has the potential for therapeutic utility in the stimulation of PTH release , notably as a bone anabolic agent comparable to recombinant human PTH(1-34) ( DB05829 (1-34) ) . A recent study has shown that , despite the ability to increase circulating PTH levels in postmenopausal women in a dose-dependent manner , minimal effects of DB05255 on bone mineral density have been observed . Therefore , the purpose of this study was to characterize the PTH profile as well as calcium metabolism parameters as a marker of PTH biological activity following the administration of DB05255 or DB05829 (1-34) . Administration of DB05255 led to lower peak levels of PTH than were observed with DB05829 (1-34) , however , greater total PTH exposure was observed . Further , chronic administration of either agent was associated with increases in urinary calcium excretion and serum calcium levels , with the magnitude of the changes following DB05255 significantly greater than that for DB05829 (1-34) . The greater magnitude of effects observed with DB05255 is likely due to the greater total PTH exposure , and is potentially reflective of a state comparable to mild hyperparathyroidism . It is not clear whether the administration of all calcilytics would lead to a similar result , or is due to characteristics specific to DB05255 . P35372 and P20813 gene variants as risk factors in methadone-related deaths . DB00333 is a medication valued for its effectiveness in the treatment of heroin addiction ; however , many fatal poisonings associated with its use have been reported over the years . We have examined the association between P20813 and micro-opioid receptor ( P35372 ) gene variations and apparent susceptibility to methadone poisoning . Genomic DNA was extracted from postmortem whole blood of 40 individuals whose deaths were attributed to methadone poisoning . The presence of P20813 *4,*9 , and *6 alleles and the P35372 A118G variant was determined by SNP genotyping . P20813 *4 , *9 , and *6 alleles were found to be associated with higher postmortem methadone concentrations in blood ( P < or = 0.05 ) . P35372 A118G was also associated with higher postmortem methadone concentrations in blood but not to a level of statistical significance ( P = 0.39 ) . In these methadone-related deaths , P35372 118GA was associated with higher postmortem benzodiazepine concentrations ( P = 0.04 ) , a finding not associated with morphine-related deaths . The risk of a methadone-related fatality during treatment may be evaluated in part by screening for P20813 *6 and A118G . Selective inhibitors of Q02750 /ERK44/42 and p38 mitogen-activated protein kinases potentiate apoptosis induction by sulindac sulfide in human colon carcinoma cells . The nonsteroidal anti-inflammatory drug ( NSAID ) sulindac prevents experimental colon cancer and can regress precancerous polyps in humans . Sulindac sulfide inhibits cyclooxygenase ( P36551 ) -mediated prostaglandin synthesis and retards the growth of cultured colon cell lines primarily by inducing apoptosis . Given the known role of mitogen-activated protein kinase ( MAPK ) in signal transduction and the regulation of cell survival and death , we determined the effect of sulindac sulfide on MAPK activation , P35354 expression , and apoptosis induction in HCA-7 human colon cancer cells . Sulindac sulfide treatment was associated with activation of ERKp44/42 and p38 MAPK in a dosage- and time-dependent manner , and also activated upstream MEK . Similar results were seen in HCT-15 cells and also with the selective P35354 inhibitor NS398 . ERKp44/42 and p38 activation were accompanied by an induction of P35354 protein expression . Selective inhibitors of sulindac sulfide-induced ERKp44/42 ( PD98059 ) and p38 MAPK ( SB203580 ) activation also suppressed the induction of P35354 by this NSAID . Furthermore , both MAPK inhibitors significantly augmented sulindac sulfide-induced apoptosis , as did suppression of constitutive P35354 using antisense oligonucleotides . In conclusion , MEK/ P29323 and p38 MAPK activation mediate P35354 induction by sulindac sulfide . Selective inhibitors of these MAPKs potentiate apoptosis induction by this NSAID , suggesting a novel strategy for the prevention or treatment of colorectal cancer . Linkage assignment of eleven genes to the porcine genome . We report comparative linkage mapping of eleven genes in the swine genome by RFLP analysis . These genes include : Acid phosphatase type 5 ( P13686 ) , Cholecystokinin Type B Receptor ( P32239 ) , Antibiotic Peptide ( P49913 ) , P01308 -like Growth Factor 1 Receptor ( P08069 ) , Integrin Alpha M ( P11215 ) , Integrin Beta 2 ( ITGbeta2 ) , Opioid Receptor Mu-1 ( P35372 ) , Pro-hormone Converter ( PC1/3 ) , DB00162 Binding Q12988 ( P10745 ) , Ribosomal DNA ( RNR1 ) , and Zona Pellucida Glycoprotein 1 ( P60852 ) . The P32239 and ITGbeta2 loci define the ends of the linkage groups on Chromosomes ( Chro ) ( SSC ) 9p and 13qter , respectively . DB06288 is a potent P34969 antagonist : relevance for antidepressant actions in vivo . RATIONALE : DB06288 is approved for clinical use in treating schizophrenia in a number of European countries and also for treating dysthymia , a mild form of depression , in Italy . DB06288 has also been demonstrated to be an antidepressant for patients with major depression in many clinical trials . In part because of the selective D(2)/D(3) receptor antagonist properties of amisulpride , it has long been widely assumed that dopaminergic modulation is the proximal event responsible for mediating its antidepressant and antipsychotic properties . OBJECTIVES : The purpose of these studies was to determine if amisulpride 's antidepressant actions are mediated by off-target interactions with other receptors . MATERIALS AND METHODS : We performed experiments that : ( 1 ) examined the pharmacological profile of amisulpride at a large number of central nervous system ( CNS ) molecular targets and , ( 2 ) after finding high potency antagonist affinity for human 5-HT(7a) serotonin receptors , characterized the actions of amisulpride as an antidepressant in wild-type and 5-HT(7) receptor knockout mice . RESULTS : We discovered that amisulpride was a potent competitive antagonist at 5-HT(7a) receptors and that interactions with no other molecular target investigated in this paper could explain its antidepressant actions in vivo . Significantly , and in contrast to their wild-type littermates , 5-HT(7) receptor knockout mice did not respond to amisulpride in two widely used rodent models of depression , the tail suspension test and the forced swim test . CONCLUSIONS : These results indicate that 5-HT(7a) receptor antagonism , and not D(2)/D(3) receptor antagonism , likely underlies the antidepressant actions of amisulpride . DB00106 and other gonadotrophin-releasing hormone antagonists in prostate cancer . Hormonal therapy is the main recommended treatment for locally advanced and metastatic prostate cancer . DB00044 -releasing hormone ( P01148 ) agonists , such as buserelin , goserelin , leuprorelin and triptorelin , stimulate the pituitary 's gonadotrophin-releasing hormone ( DB00644 ) receptor , ultimately leading to its de-sensitization and subsequent reduction of LH and testosterone levels . However , this reduction is accompanied by a well described increase or ' surge ' in LH and testosterone levels , necessitating the concomitant administration of an antiandrogen to combat the potential effects of transient acceleration in cancer activity . Two pure DB00644 antagonists have been developed , abarelix and degarelix , that are devoid of any agonist effect on the P30968 and consequently do not result in testosterone flare . DB00106 was the first DB00644 antagonist to be developed and was approved by the USA Food and Drug Administration in 2004 for the initiation of hormonal castration in advanced or metastasizing hormone-dependent prostate carcinoma , when rapid androgen suppression is necessary . Clinical data on both abarelix and degarelix show that they can produce rapid and sustained decreases in testosterone to castrate levels without the need for co-administration of an antiandrogen , and with a very low complication rate in the short term . Selective inhibition of the tumor marker O60218 by antiinflammatory N-phenylanthranilic acids and glycyrrhetic acid . A human aldose reductase-like protein , O60218 in the aldo-keto reductase ( AKR ) superfamily , was recently identified as a tumor marker of several types of cancer . DB02383 , an aldose reductase inhibitor ( Q9Y4X5 ) , is known to be the most potent inhibitor of the enzyme . In this study , we compared the inhibitory effects of other ARIs including flavonoids on O60218 and aldose reductase to evaluate their specificity . However , ARIs showed lower inhibitory potency for O60218 than for aldose reductase . In the search for potent and selective inhibitors of O60218 from other drugs used clinically , we found that non-steroidal antiinflammatory N-phenylanthranilic acids , diclofenac and glycyrrhetic acid competitively inhibited O60218 , showing K(i) values of 0.35-2.9 microM and high selectivity to this enzyme ( 43-57 fold versus aldose reductase ) . Molecular docking studies of mefenamic acid and glycyrrhetic acid in the O60218 -nicotinamide adenine dinucleotide phosphate ( NADP(+) ) complex and site-directed mutagenesis of the putative binding residues suggest that the side chain of Val301 and a hydrogen-bonding network among residues Val301 , Gln114 and Ser304 are important for determining the inhibitory potency and selectivity of the non-steroidal antiinflammatory drugs . Thus , the potent and selective inhibition may be related to the cancer chemopreventive roles of the drugs , and their structural features may facilitate the design of new anti-cancer agents targeting O60218 . Polymorphisms associated with egg number at 300 days of age in chickens . We looked for variations that could be associated with chicken egg number at 300 days of age ( EN300 ) in seven genes of the hypothalamic-pituitary-gonadal axis , including gonadotrophin-releasing hormone-I ( DB00644 ) , P30968 ( GnRHR ) , neuropeptide Y ( P01303 ) , dopamine D2 receptor ( P14416 ) , vasoactive intestinal polypeptide ( P01282 ) , P01282 receptor-1 ( VIPR-1 ) , prolactin ( PRL ) , and the QTL region between 87 and 105 cM of the Z chromosome . Ten mutations in the seven genes were chosen to do marker-trait association analyses in a population comprising 1310 chickens , which were obtained from a company located in Guangdong Province of China . The C1704887T of VIPR-1 was found to have a highly significant association with EN300 . The T5841629C of P14416 and the C1715301T of VIPR-1 were significantly associated with EN300 . A highly significant association was also found between the C1704887T-C1715301T haplotypes of VIPR-1 and EN300 . H1H3 had the highest EN300 . Four PCR-RFLP variations in the candidate QTL region were selected to investigate their genetic effects on EN300 . The haplotypes of T32742468C-G32742603A in this region showed a highly significant association with EN300 . Bioinformatics analyses showed that both T32742468C and G32742603A were located in intron 1 of the SH3-domain P62993 -like 2 ( Q99962 ) gene . We conclude that five SNPs , including C1704887T and C1715301T of VIPR-1 , T5841629C of P14416 , and T32742468C and G32742603A of Q99962 , would be useful as markers for breeding to increase chicken EN300 . Variants of dopamine and serotonin candidate genes as predictors of response to risperidone treatment in first-episode schizophrenia . AIMS : Abnormalities in dopaminergic and serotonergic transmission systems are thought to be involved in the pathophysiology of schizophrenia and the mechanisms underlying the therapeutic effects of antipsychotics . We conducted a pharmacogenetic study to evaluate whether variants in dopamine-related genes ( P21728 - P21918 , P31749 and GSK3beta ) and serotonin receptor genes ( P08908 , P28222 , P28221 , P28223 , P28335 , P50406 and P34969 ) can be used to predict the efficacy of risperidone treatment for schizophrenia . MATERIALS & METHODS : A total of 120 first-episode neuroleptic-naive schizophrenia patients were treated with risperidone monotherapy for 8 weeks and clinical symptoms were evaluated by the Positive and Negative Syndrome Scale . RESULTS : Among the 30 variants that we examined , two SNPs in P14416 ( -241A > G [ rs1799978 ] and TaqIA [ rs1800497 ] ) and two SNPs in P31749 ( P31749 -SNP1 [ rs3803300 ] and P31749 -SNP5 [ rs2494732 ] ) were significant predictors of treatment response to risperidone . CONCLUSION : These data suggest that the SNPs in P14416 and P31749 may influence the treatment response to risperidone in schizophrenia patients . P35372 mutant , T394A , abolishes opioid-mediated adenylyl cyclase superactivation . This study was to characterize the effects of a point-mutant at C-terminal of mu opioid receptor ( MOR ) , namely MOR T394A , in chronic opioid-induced cellular responses . After 18 h of exposure to [ D-Ala , N-Me- DB00120 , DB00145 -ol ] enkephalin ( DAMGO ) , adenylyl cyclase ( AC ) superactivation , a hallmark for the cellular adaptive response after chronic opioid stimulation , was observed in the cells expressing wild-type receptor , but was totally abolished in the cells expressing MOR T394A . Receptor phosphorylation was also attenuated in cells with MOR T394A after prolonged preexposure to agonist . Furthermore , Q96HU1 kinase kinase-1 ( Q02750 ) overexpression was able to rescue AC superactivation in cells with MOR T394A , but showed no effect in the wild-type MOR-expressing cells . These results indicated that the amino acid T394 at C-terminus of MOR played a critical role in chronic agonist-induced AC superactivation and receptor phosphorylation . Pharmacogenomics of methadone maintenance treatment . DB00333 is the major opioid substitution therapy for opioid dependence . Dosage is highly variable and is often controlled by the patient and prescriber according to local and national policy and guidelines . Nevertheless many genetic factors have been investigated including those affecting its metabolism ( P20813 -consistent results ) , efflux transport ( P-gp-inconsistent results ) , target μ-opioid receptor ( μ-opioid receptor-inconsistent results ) and a host of other receptors ( P14416 ) and signaling elements ( P48051 and P32121 ; not replicated ) . None by themselves have been able to substantially explain dosage variation ( the major but not sole end point ) . When multiple genes have been combined such as P08183 , P20813 , P35372 and P14416 a greater contribution to dosage variation was found but not as yet replicated . As stabilization of dosage needs to be made rapidly , it is imperative that larger internationally based studies be instigated so that genetic contribution to dosage can be properly assessed , which may or may not tailor to different ethnic groups and each country 's policy towards an outcome that benefits all . A new class of NO-donor pro-drugs triggered by γ-glutamyl transpeptidase with potential for reno-selective vasodilatation . This communication describes the synthesis of a new class of N-hydroxyguanidine ( NHG ) pro-drugs which release nitric oxide ( NO ) , triggered by the action of γ-glutamyl transpeptidase ( γ-GT ) , and have potential for the treatment of acute renal injury/failure ( Q9Y4X5 / Q8N726 ) . Monoclonal antibodies targeting P01584 reduce biomarkers of atherosclerosis in vitro and inhibit atherosclerotic plaque formation in P02649 -deficient mice . OBJECTIVE : Atherosclerosis is a condition that is increasingly contributing to worldwide mortality through complications such as stroke and myocardial infarction . IL-1β plays multiple direct , local roles in the formation and stability of the atheroma by eliciting the production of additional cytokines and proteolytic enzymes from macrophages , endothelial cells ( EC ) and smooth muscle cells ( SMC ) . We therefore tested whether an anti-IL-1β antibody , DB06062 , might inhibit the secretion of pro-atherogenic cytokines from macrophages in vitro and affect a positive outcome in the P02649 -deficient mouse ( ApoE(-/-) ) model of atherosclerosis in vivo . METHODS AND RESULTS : In an in vitro co-culture model , DB06062 inhibited macrophage-induced secretion of key atherogenic cytokines from EC and SMC , including P05231 , P10145 , P13500 and TNFα . The release of degradative enzymes , such as the matrix metalloproteinases P08254 and P14780 , was also decreased by DB06062 . In addition , DB06062 inhibited the secretion of P13232 from EC and P05112 from SMC , cytokines not previously reported to be driven by IL-1β in this context . In vivo , XMA052 MG1K , a chimeric murine version of DB06062 , inhibited the formation of atherosclerotic lesions in the ApoE(-/-) model at all three doses tested . This effect was comparable to that reported for complete genetic ablation of IL-1β or IL-1R1 on an ApoE(-/-) background and was associated with decreases in plasma non-HDL/HDL cholesterol ratio and plaque lipid content and macrophage infiltration . CONCLUSIONS : These results demonstrate for the first time that an antibody targeting IL-1β can inhibit the progression of atherosclerosis in vivo , highlighting the importance of this key cytokine in cardiovascular disease . Factors regulating insulin-like growth factor-binding protein-3 binding , processing , and potentiation of insulin-like growth factor action . In this study , we investigated the effects of various biochemical and pharmacological agents on insulin-like growth factor ( IGF ) -binding protein-3 ( P17936 ) cell binding and action in cultured bovine fibroblasts . When cells were preincubated for 48 h with 50 nM recombinant human ( rh ) P17936 , P05019 -stimulated [3H]aminoisobutyric acid ( [125H]AIB ) uptake was enhanced 2- to 3-fold . The addition of cytoskeletal disrupting agents during the preincubation with DB05897 did not affect P17936 potentiation of P05019 action , nor did a variety of serine , aspartate , and metalloproteinase inhibitors . On the other hand , ammonium chloride and chloroquine , weak bases that neutralize the pH of acidic cell compartments , blocked P17936 potentiation of P05019 -stimulated [3H]AIB uptake . Chloroquine and ammonium chloride had no effect alone and did not inhibit P08069 binding or action in the absence of DB05897 . Bafilomycin A , a specific inhibitor of DB00171 -dependent hydrogen ion pumps , also inhibited P17936 potentiation of P05019 -stimulated [3H]AIB uptake . Competitive [125I] P05019 binding and affinity cross-linking experiments suggested structure/function changes in cell-bound P17936 that were altered in the presence of chloroquine and bafilomycin . DB01109 markedly decreased initial P17936 cell adherence , but could not promote dissociation of P17936 from cells after the 48-h preincubation . Moreover , heparin did not inhibit P17936 potentiation of P05019 action . In summary , these data indicate that P17936 undergoes specific pH-dependent structural and/or environmental modifications that mediate the enhancing effect of P17936 on P05019 action in bovine fibroblasts . They also suggest that P17936 binding to heparin-like molecules on the cell surface is not directly involved in this process . P35372 and P00533 contribute to skin pigmentation differences between Indigenous Americans and Europeans . Contemporary variation in skin pigmentation is the result of hundreds of thousands years of human evolution in new and changing environments . Previous studies have identified several genes involved in skin pigmentation differences among African , Asian , and European populations . However , none have examined skin pigmentation variation among Indigenous American populations , creating a critical gap in our understanding of skin pigmentation variation . This study investigates signatures of selection at 76 pigmentation candidate genes that may contribute to skin pigmentation differences between Indigenous Americans and Europeans . Analysis was performed on two samples of Indigenous Americans genotyped on genome-wide SNP arrays . Using four tests for natural selection -- locus-specific branch length ( LSBL ) , ratio of heterozygosities ( lnRH ) , Tajima 's D difference , and extended haplotype homozygosity ( EHH ) -- we identified 14 selection-nominated candidate genes ( SNCGs ) . SNPs in each of the SNCGs were tested for association with skin pigmentation in 515 admixed Indigenous American and European individuals from regions of the Americas with high ground-level ultraviolet radiation . In addition to Q71RS6 and Q9UMX9 , genes previously associated with European/non-European differences in skin pigmentation , P35372 and P00533 were associated with variation in skin pigmentation in New World populations for the first time . Genetics of physical activity and physical inactivity in humans . Emerging evidence suggests that physical activity and sedentary behavior [ reflected in physical inactivity ( PI ) ] , might be two different phenotypes that may have distinct underlying physiological mechanisms . The purpose of this review is to summarize the existing literature on the genetic determinants of PA and PI phenotypes in humans , considering them as distinct behaviors . Completed in January 2011 , this review includes family studies , twin studies , association studies , genome-wide linkage studies and genome-wide association scan ( GWAs ) reporting different physical activity/inactivity-related phenotypes . In regards to PA , familial aggregation studies resulted in heritability estimates ranging from 0 to 60 % , and twin studies yielded heritability estimates ( a(2) ) and shared environment ( c(2) ) scores for PA phenotypes ranging from 0.00 to 0.85 and 0.00 to 0.84 , respectively . Unique environmental ( e(2) ) results are well dispersed from 0.12 to 0.72 . Suggestive linkages were found with markers nearby different activity-related genes : P24530 , P32245 , P25874 , P12104 , P41180 , Q8IVB4 . Significant associations with PA phenotypes were found for Ace , Gln223ARrg , P32245 and P14416 genes . We found one GWAs that reported novel SNPs in the O95340 gene on chromosome 10q23.2 and in two intergenic regions on chromosomes 2q33.1 and 18p11.32 . Heritability estimates for PI ranged from 25 to 60 % and linkage studies recorded higher LOD scores for PI versus PA . The P12821 genotype was strongly associated with PI . There are potentially different genetic influences on PA versus PI phenotypes . Future studies should focus on the different genetic influences on PA and PI to improve our understanding of underlying determinants of these behaviors . Polymorphisms of dopamine receptor/transporter genes and risk of non-small cell lung cancer . BACKGROUND : The dopaminergic pathway may be of interest in assessing risk of non-small cell lung cancer ( NSCLC ) . Dopamine receptors are expressed in alveolar epithelial cells and human lung tumours , and dopamine inhibits both cell proliferation in vitro and growth of lung tumour xenografts in nude mice . Moreover , dopamine selectively inhibits the vascular permeability and angiogenic activity of vascular endothelial growth factor ( P15692 / P15692 ) . The bioavailability of dopamine is regulated by dopamine receptors D2 ( P14416 ) , D4 ( P21917 ) and dopamine transporter 1 ( Q01959 / Q01959 ) genes . METHODS : We have analysed 10 single nucleotide polymorphisms in P14416 , P21917 and Q01959 / Q01959 genes in relation to lung cancer risk in a case-control study of smoking subjects . The study subjects were 413 healthy individuals from general population and 335 NSCLC cases . Both cases and controls were Caucasians of Norwegian origin . RESULTS : We demonstrate that P14416 polymorphisms -141Cdel , 3208G > T , TaqIB ; P21917 -521C > T and Q01959 / Q01959 -1476T > G are associated with a two- to five-fold increased NSCLC risk . The variant alleles of P14416 1412A > G and 960C > G had protective effects . CONCLUSION : The dopamine receptor/transport gene polymorphisms are associated with the risk of NSCLC among smokers . The data show that the polymorphisms resulting in lower dopamine bioavailability were associated with increased risk of NSCLC . Molecular basis of functional gastrointestinal disorders . There are a number of abnormalities of gastrointestinal function , including sensory and motor dysfunction , which are believed to play a role in the manifestation of symptoms in patients with functional gastrointestinal disorders ( FGID ) . In addition , there is a remarkable psychiatric comorbidity . Family and twin studies have provided strong evidence for a clustering of FGID in families and an increased concordance in monozygotic compared to dizygotic twins . This points towards the role of one or more hereditary ( genetic ) factors . Considering these disorders of function and the psychiatric comorbidity , polymorphisms of adrenergic , opioidergic or serotonergic receptors as well as G-protein beta3 ( P16520 ) subunit gene polymorphisms ( C825T ) and polymorphisms of 5-HT transporter genes are suitable causes . In addition , mediators or regulators of mucosal inflammation may trigger events that ultimately result in the manifestation of FGID . Thus , relevant polymorphisms of genes with immunmodulating and/or neuromodulating features ( P35372 , P05112 , IL-4R , TNFalpha ) may also play a role in the manifestation of FGIDs . Second-generation epidermal growth factor receptor tyrosine kinase inhibitors in lung cancers . P00533 mutations identify patients who are more likely to respond to treatment with epidermal growth factor receptor ( P00533 ) tyrosine kinase inhibitors ( TKIs ) than cytotoxic chemotherapy . The distinct success of the first-generation P00533 TKIs erlotinib and gefitinib has been accompanied by the observation that acquired resistance to these treatments develops after a median of 1 year of treatment . Newer , second-generation P00533 TKIs have been developed with the intent to delay or overcome acquired resistance by the broader inhibition of kinases ( eg , P04626 and vascular endothelial growth factor receptor ) and/or altering the interactions with P00533 through irreversibly binding to the kinase domain . This article discusses many of these agents ( including afatinib , dacomitinib , DB05007 , AP26113 , and CO-1686 ) which have the potential for greater efficacy compared with first-generation P00533 TKIs , and may also have clinical activity against other oncogenic mutations within the P00533 family , including P04626 . ADP-ribosylation factor-dependent phospholipase D2 activation is required for agonist-induced mu-opioid receptor endocytosis . Agonist exposure of many G protein-coupled receptors induces a rapid receptor phosphorylation and uncoupling from G proteins . Resensitization of these desensitized receptors requires endocytosis and subsequent dephosphorylation . Using a yeast two-hybrid screen , the rat mu-opioid receptor ( P35372 , also termed MOP ) was found to be associated with phospholipase D2 ( O14939 ) , a phospholipid-specific phosphodiesterase located in the plasma membrane , which has been implicated in the formation of endocytotic vesicles . Coimmunoprecipitation experiments in HEK293 cells coexpressing P35372 and O14939 confirmed that P35372 constitutively interacts with O14939 . Treatment with the mu receptor agonist DAMGO ( [ d-Ala(2) , Me DB00120 (4) , Glyol(5) ] enkephalin ) led to an increase in O14939 activity , whereas morphine , which does not induce P35372 receptor internalization , failed to induce O14939 activation . The DAMGO-mediated O14939 activation was inhibited by brefeldin A , an inhibitor of ADP-ribosylation factor ( Q8N726 ) but not by the protein kinase C ( PKC ) inhibitor calphostin C indicating that opioid receptor-mediated activation of O14939 is Q8N726 - but not PKC-dependent . Furthermore , heterologous stimulation of O14939 by phorbol ester led to an accelerated internalization of the mu-opioid receptor after both DAMGO and morphine exposure . Conversely the inhibition of O14939 -mediated phosphatidic acid formation by 1-butanol or overexpression of a negative mutant of O14939 prevented agonist-mediated endocytosis of P35372 . Together , these data suggest that O14939 play a key role in the regulation of agonist-induced endocytosis of the mu-opioid receptor . Pharmacokinetics of rofecoxib : a specific cyclo-oxygenase-2 inhibitor . DB00533 is a commonly used specific cyclo-oxygenase-2 ( P35354 ) inhibitor . DB00533 has high bioavailability , poor aqueous solubility , an elimination half-life suitable for daily administration and a volume of distribution approximating body mass . Species-specific , predominantly hepatic , metabolism occurs , with novel enterohepatic circulation in rats and O-glucuronidation by uridine diphosphate-glucuronosyl transferase ( P78381 ) 2B7 and 2B15 in human liver microsomes . Discrepancies in studies of postoperative analgesia can be putatively explained by known pharmacokinetics . Changes in rofecoxib disposition and pharmacokinetics are evident between races , in elderly patients , in patients with chronic renal insufficiency and in patients with mild to moderate hepatic impairment . Despite the selective action of P35354 inhibitors , there remains the potential for significant drug interactions . DB00533 has been shown to have interactions with rifampicin ( rifampin ) , warfarin , lithium and angiotensin converting enzyme ( P12821 ) inhibitors and theophylline . P35354 inhibitors represent a major therapeutic advance in terms of gastrointestinal safety ; however , long-term safety in other organ systems and with concomitant drug administration still remain to be proven .