half life

Due to the obvious advantages of long-acting peptide and protein drugs, strategies to prolong plasma half life time of such compounds are highly on demand...

..Our results identify previously unsuspected features of mRNA decay at a global level and also indicate that generalizations about decay derived from the study of individual gene transcripts may have limited applicability...

..Our experimental data and theoretical analysis underscore the importance of an integrative approach to the complex interplay between protein degradation, transcriptional regulation, and other determinants of protein metabolism...

..Because of its autofluorescence, destabilized EGFP can be used to directly correlate gene induction with biochemical change, such as NFkappaB translocation to the nucleus...

....

....

....

..The strategy to select compounds with rapid brain equilibration in drug discovery should identify compounds with high BBB permeability and low nonspecific binding in brain tissue...

..These data suggest that FcRn can protect IgG from degradation, and is therefore important in maintaining IgG levels in the circulation...

..These findings suggest that FcRn is involved in IgG homeostasis...

....

..However, this dominant compartment was shifted to both thyroid and body fluid, based on analyses of the data following thyroidectomy, for the patients herein...

..These quantitative analyses provide a more detailed picture of the dynamics of HBV infection and therapy, and can be used to compare the efficacy of various doses and inhibitors of HBV replication for the treatment of HBV infections...

..Our results suggest that ENaC function is regulated by ubiquitination, and propose a paradigm for ubiquitination-mediated regulation of ion channels...

..These results indicate that the in vivo PDT effect of m-THPC occurs via several mechanisms...

..Prior treatment of P.longum significantly reduced elimination rate constant(beta)and increased elimination half life (t(1/2beta))...

..Possible functions for this complex in nucleocytoplasmic transport of spliced mRNA, as well as the nonsense-mediated mRNA decay pathway, are discussed...

..PFOS has longer half-life and had respective values of 13.6 mg/(h kg), 0.023 mg/L, and 0.025. PFOS appeared to have a higher transport capacity and lower affinity than PFOA. Human kinetics indicates even higher resorption efficiency...

..The mean systemic bioavailability (F) after p.o. administration was 31.10 +/- 15.16%. We suggest that the optimal dosage calculated from the pharmacokinetic parameters is 5.01 mg/kg per day i.v. or 16.12 mg/kg per day p.o...

..The donors had better test results and recovered faster than the recipients. In conclusion, after LDLT the parameters for liver capacity and flow remain altered in donors and recipients despite rapid volume growth...

..The total body clearance (Cl(B)) was 204.9+/-22.6 ml/kg/h. On the basis of the pharmacokinetic parameters, a suitable intramuscular dosage regimen for levofloxacin in calves would be 1.5 mg/kg repeated at 12 h intervals...

..Thus, rapid mRNA degradation appears to be an important mechanism for turning gene expression off in an activation-dependent manner...

....

..The model is also applicable to the evolution of antibiotic resistance in bacteria: in particular, the need for these models to incorporate drug pharmacokinetics to avoid potentially large errors in their predictions...

....

..Pharmacokinetic and statistical analyses are reported to elucidate key variables affecting 2,3,7,8-tetrachlorodibenzo-p-dioxin (TCDD) elimination in children and adolescents...

..This complex orthologous to the RNA degrading exosome of eukarya is found in all other archaeal genomes sequenced thus far...

..This evaluation demonstrates that PBPK models can lead to reasonable predictions of human pharmacokinetics...

..Previously, studies in several organisms found that the specific half-life of each mRNA is precisely related to its physiologic role, and plays an important role in determining levels of gene expression...

....

..Interestingly, the magnitude of induction appeared to be affected by MDR1 genotype...

..Based on the result of both the oral and iv studies, the elimination half-life is approximately 14-42 days, and urine is the primary route of excretion...

....

..Here, we present a microarray-based analysis of mRNA half-lives in the hyperthermophilic crenarchaea Sulfolobus solfataricus and Sulfolobus acidocaldarius, constituting the first genome-wide study of RNA decay in archaea...

..These apparently distinct subpopulations would be expected to exhibit different disposition of xenobiotics, particularly those that are highly lipophilic and poorly metabolized...

..However, mainly high VWF and FVIII levels caused by increased secretion seem to be associated with thrombosis. ABO blood group influences the clearance rates of VWF rather than VWF secretion rates...

..The half life time at 60 degrees C was approximately 10 h, compared to 7.6 min for the wild-type enzyme...

..We propose that the posttranscriptional derepression of GADD45alpha critically contributes to its potent upregulation after DNA damage...

..The inverse relation between clonal frequency and survival suggests that intraclonal competition could help maintain an optimally diverse repertoire of T cells and an optimal environment for the generation of long-lived memory cells...

..In particular, we motivate focusing on a Vandermonde ensemble of multiparameter nonlinear models and show in one limit that they exhibit the universal features of sloppy models...

....

..Thus, the shorter half-life of dioxins during breastfeeding needs to be considered when evaluating the dioxin hazard to children...

..The current study provides limited additional evidence that PCDFs, like TCDD, are more rapidly eliminated in younger individuals...

..These data suggest that rVIIa-FP may be a promising therapy for the treatment of haemophilia patients with inhibitors and warrants further investigation in clinical trials...

..The t (1/2, op) is compared with previously proposed half-lives for predicting accumulation...

..05) that in FSH-stimulated cells. We conclude that bovine Cyp19 mRNA is very labile under physiological conditions, and that Cyp19 expression is under hormonal control at a post-transcriptional level...

..Using functionalized polyamidoamine dendrimer generations 1 through 8, we investigated how nanoparticle size influences particle accumulation within malignant glioma cells...

..To investigate the pharmacogenetic effect of SLCO1B1 *1a, *1b, *5 and *15 polymorphisms on irinotecan disposition in Asian cancer patients...

..The aim of this study was to describe the association of factor VIII half-lives with treatment and clinical characteristics of patients with severe hemophilia A, who have been treated with individually tailored prophylaxis...

..The longest half-lives correspond to elimination of the parent PCB solely with a daily fat excretion rate of 1-2 g, whereas shorter half-lives assume metabolic break-down...

..NN1731 is a recombinant activated factor VII (rFVIIa) analog with enhanced activity...

..CONCLUSION: This population pharmacokinetic model can predict trastuzumab exposure in the long-term treatment of patients with metastatic breast cancer and provide comparison of alternative dosage regimens via simulation...

..It is possible that these anti-A antibodies interact with endogenous vWF, thus affecting the half-life time of the factor VIII/vWF complex...

..The systemic bioavailability after IM injection was 65.70% +/- 10.28% and the serum protein-bound fraction was 13.55 +/- 1.78%...

..8, 20.2, and 28.7 h, and slightly higher values were obtained for transudate and exudate. It is proposed that use of these data might provide a novel approach to the rational design of dosage schedules...

..This demonstrates that an inducible elimination rate is needed in a PBPK model in order to describe the pharmacokinetics of TCDD. At low exposures these models are more sensitive to parameters related to partitioning into adipose tissue...

..36 and 7.35 mgkg(-1) for i.m. and i.v. administration, respectively...

..To investigate the safety and pharmacokinetics of a new liposomal formulation of cisplatin, SPI-77, in patients with advanced malignancies...

..F(ab')2 fragments may provide a substantially enhanced method of delivering RIT...

..The purpose of the study was to investigate the distribution of codeine across the blood-brain barrier (BBB) in rats by microdialysis (MD)...

..The identified set of extremely stable mRNAs may be useful in the construction of stable recombinant genes for the overproduction of biomolecules in Bacillus species...

..It was hypothesized in this clinical study that active efflux of morphine occurs also in human brain, and that brain injury would alter cerebral morphine pharmacokinetics...

..The enhanced oral absorption by BA coadministration may be exploited to improve oral bioavailability of Pgp and CYP3A substrate compounds...

..This strategy is significant because it allows us to classify the genes regulated by NMD into functionally related sets, an important step toward understanding the role NMD plays in the normal functioning of yeast cells...

..These data suggest that Smad3 plays a key role in the regulation of Cdc25A ubiquitination by SCFbeta-TrCP and that Cdc25A stabilization observed in various cancers could be associated with defects in the TGF-beta-Smad3 pathway...

....

..Valdecoxib provides a valuable alternative in the treatment of chronic arthritis pain and acute pain...

..Further evaluation of this agent with 2-4 mg kg(-1) weekly intravenous infusion is warranted...

..The data demonstrate the potential of CRP-Ig as reagents for sustained therapy of inflammatory disorders, including arthritis, but emphasize the need for careful design of fusion proteins to retain function...

..When employed twice a week, the amount of TCDD excreted by this method was comparable to fecal excretion. In view of costs and time involved, LDL-apheresis does not seem to be justified for enhancement of TCDD elimination...

..The half-life in brain ECF vs. the half-life in blood gives information on rate-limiting steps in drug delivery and elimination from the CNS. Examples are given on microdialysis studies of analgesic and antiepileptic drugs...

..Half the effect delay of M6G can be explained by transport across the BBB, suggesting that the remaining effect delay of 53 min is a result of drug distribution within the brain tissue or rate-limiting mechanisms at the receptor level...

..These results suggest that selenium is a key element that through its modulation of glutathione peroxidase activity can inhibit NF-kappa B activation and can up-regulate I kappa B alpha normal half life.

....

..But what are the sequence elements and factors that control the half-lives of mRNAs?..

..Treatment with rhIL-11 with or without DDAVP may provide an alternative to plasma-derived products for some VWD and hemophilia A patients if it is shown safe in clinical trials...

..These studies demonstrate that the association between CK2 and PKC-zeta may play a major role in the control of the basal turnover of free IkappaBalpha, in the absence of extracellular stimuli...

..This study aimed to compare the systemic bioavailability of two aciclovir tablets, Rouz-Aciclovir (test) and Zovirax (reference), in 12 healthy volunteers...

..The primary objective of this study was to compare the 12-h pharmacokinetic profile of S(+)-ibuprofen following administration of single doses of ibuprofen arginate (600 mg) and dexibuprofen (400 mg) in healthy volunteers...

..25 h, with the C(max) of 0.03 +/- 0.01 microg/mL at 6.67 +/- 2.31 h. Ciprofloxacin was eliminated with terminal half-life t(1/2,beta) of 52.08 +/- 17.34 h for intravenous administration and 52.43 +/- 22.37 h for oral administration...

..This type of pharmacology-based evaluation of drug interactions is becoming highly relevant as drug combinations are now widely used as an alternative to control resistant helminth parasites in livestock...

..In summary, the favorable oral bioavailability properties of those four active alkaloids in rats make Yanhuanglian extract worth further investigation for improving oral bioavailability...

..It can thus be concluded that incorporation into liposomes prolonged taspine retention within the systemic circulation, increased its distribution to the spleen and liver but reduced its distribution to the heart and brain...

..To evaluate the potential of rifaximin, an oral nonabsorbed (< 0.4%) structural analog of rifampin, to induce human hepatic and/or intestinal cytochrome P450 (CYP) 3A enzymes, with use of a known CYP3A probe, midazolam...

..The excretion studies after the 8 mg/kg oral dose indicated that the compound was not excreted through the feces and the urinary excretion was very low (<2%)...

..25 microg/mL and <0.1 microg/mL respectively...

..A secondary peak was observed in the serum concentration-time profiles in non-BDC rats following both i.v. and oral administration, indicating that otilonium bromide was subject to enterohepatic recirculation...

....

..These studies demonstrate that S-4 maintains its promising pharmacokinetic properties in dogs (i.e., high oral bioavailability and linear kinetics) and is largely eliminated via hepatic metabolism by both phase I and phase II enzymes...

....

..Flumequine administered at a dosage of 24 mg/kg bw every 24h for 5 days, with a withdrawal time of 2d ays, resulted in flumequine concentrations in target tissues that were less than the European Union maximal residue limits...

..Minor interspecies variations in the pharmacokinetics of deferiprone exist between chickens and pigeons...

..The objective of this study was to assess the absolute oral bioavailability of vildagliptin by comparing the systemic exposure after oral and intravenous administration in healthy volunteers...

..Enteric-coated mycophenolate sodium is an advanced formulation delivering mycophenolic acid (MPA), designed to improve MPA-related upper gastrointestinal adverse events by delaying MPA release until the small intestine...

..Concomitant administration of alfentanil and CYP3A inhibitors may lead to clinically important drug interactions. We investigated the possible interactions between alfentanil and orally administered voriconazole and terbinafine...

..A comparison of in vitro and in vivo metabolite profiles between mice, rats, rabbits, and dogs with those from humans indicated that metabolic pathways for ciclesonide were qualitatively similar in humans and in the 4 animal species...

..The rate and extent of fentanyl absorption were greater following administration of FBT compared to OTFC. An approximately 30% smaller dose of FBT achieved systemic exposures comparable to OTFC...

..Based on these results, oral enrofloxacin may be considered for further study as a treatment option for susceptible infections in goral...

..Pharmacokinetics of senkyunolide A were unaltered when Chuanxiong extract was administered, which suggests that components in the extract have insignificant effects on senkyunolide A pharmacokinetics...

..Risk of drug precipitation due to poor solubility; and short vitreal half life upon intravitreal injection are the key deterrents in their delivery...

..We strongly believe that the proposed studies will fulfill the requirements for advanced preclinical studies with 1-2 candidates in view of Phase 1 study in breast cancer patients. ..

..Risk of drug precipitation due to poor solubility;and short vitreal half life upon intravitreal injection are the key deterrents in their delivery...

..The proposed experiments will provide insights into pathogenesis, and could lead to development of new therapeutic approaches for RA. ..

..Reducing epithelial cell hyperplasia may also help reduce the risk of developing lung cancer. ..

..Reducing epithelial cell hyperplasia may also help reduce the risk of developing lung cancer. ..

..It provides an ideal design to evaluate the effects of isoflavones on the IGF system and to explore relationships between IGFs and colonic epithelial cell proliferation in humans. ..

..We also wish to employ the knowledge obtained from these studies to develop a therapeutic approach for inhibiting pathological angiogenesis. ..

..Understanding how ACE inhibitors and DPPIV inhibitors interact will help physicians prescribe these medications safely and will influence the development of new medications to treat diabetes and high blood pressure. ..

..Understanding how ACE inhibitors and DPPIV inhibitors interact will help physicians prescribe these medications safely and will influence the development of new medications to treat diabetes and high blood pressure. ..

..Phase II results will lead to an IND for MEGC-PEG-rMETase for end stage renal disease patients and other patients with intractable hyperhomocysteinemia and high cardiovascular disease mortality. ..

..The proposed work will allow us to increase the therapeutic applicability of our approach and enhance its safety, prior to a clinical application. ..

..We also wish to employ the knowledge obtained from these studies to develop a therapeutic approach for inhibiting pathological angiogenesis. ..

..This proposal will begin to identify the genetic mechanisms controlling human Zip13 in response to low cellular zinc providing clues to how human cells regulate zinc metabolism. ..

..The long-term goal of this application is to develop a drug that will restore salt movement into and out of cells and alleviate the symptoms in CF patients. ..

..The long-term goal of this application is to develop a drug that will restore salt movement into and out of cells and alleviate the symptoms in CF patients. ..

..The long-term goal of this application is to develop a drug that will restore salt movement into and out of cells and alleviate the symptoms in CF patients. ..

..In total, these studies should provide significant contributions to the current state of knowledge regarding the epidemiology of cocaine-alcohol abuse and treatment of these disorders. ..

..the optimal structural and formulation variables to provide for a high therapeutic index and long intraocular half life. The best compounds and formulations will be tested in accepted animal models of the important retinal diseases ..

..the optimal structural and formulation variables to provide for a high therapeutic index and long intraocular half life. The best compounds and formulations will be tested in accepted animal models of the important retinal diseases ..

..This research seeks to identify the components of the PMR1 decay complex, identify the scope of PMR1-mediated decay and relate both of these to the invasive growth of cancer cells. ..

..Secondary outcome measures will include ALSFRS-R, vital capacity, strength, and the long-term safety and tolerability of ceftriaxone in this population. ..

..This proposal meets the goals of the US Public Health Service in treating chronic liver diseases. ..

..This proposal meets the goals of the US Public Health Service in treating chronic liver diseases. ..

..This proposal meets the goals of the US Public Health Service in treating chronic liver diseases. ..

..This raises the possibility that blockade of FcRn function may be of therapeutic utility in colitis if our studies support an involvement of FcRn in inflammation. ..

..This raises the possibility that blockade of FcRn function may be of therapeutic utility in colitis if our studies support an involvement of FcRn in inflammation. ..

..The development of a quantitative assay for such a metabolite will have a major impact on the assessment of LTB4 production in human health as well as disease. ..

..Our hypothesis is that decitabine should ultimately couple with engineered enzyme variants to yield improvements in the performance of dCK, due to the lack of this activity in non-cancerous tissues. ..

..Our hypothesis is that decitabine should ultimately couple with engineered enzyme variants to yield improvements in the performance of dCK, due to the lack of this activity in non-cancerous tissues. ..

..abstract_text> ..