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Synthesize them de novo, inhibition of DHOD results in parasite death 43 ; . ATP generation is another physiologic process linked to an intact mitochondrial membrane potential, although in plasmodia ATP levels are not consistently decreased by the administration of atovaquone. The effect of atovaquone on malaria parasites occurs at nanomolar concentrations 51 ; . When used as a single agent in patients with malaria, atovaquone is effective, but it is associated with unacceptable recrudescence rates and decreased parasite susceptibility following treatment 22, 78 ; . Therefore, other drugs have been studied as synergistic partners. Proguanil demonstrated synergistic activity in vitro even against atovaquone-resistant P. falciparum isolates 16 ; . The activity of proguanil when it was used with atovaquone was generally stronger than that of its metabolite cycloguanil, which was unexpected since the antimalarial effect of proguanil has been attributed to dihydrofolate reductase inhibition by cycloguanil 98 ; . This independent effect of proguanil may be the result of its enhancement of atovaquone's collapse of the mitochondrial membrane potential 122 ; . Therefore, proguanil may be synergistic with atovaquone by enhancement of the activity of atovaquone and through inhibition of dihydrofolate reductase by cycloguanil. It is presumed that atovaquone kills other infectious agents through the same mechanism: inhibition of ubiquinone binding to cytochrome b. This has been demonstrated for T. gondii 84 ; and P. carinii, which has recently been reclassified from a parasite to a fungus 124 ; . In Pneumocystis, inhibition of ubiquinone binding results in inhibition of DHOD 61 ; and markedly decreased levels of ATP 26 ; . The effects of atovaquone on Pneumocystis occur at micromolar concentrations 24, 26 ; . Mutations of the cytochrome b gene have occurred in atovaquone-resistant isolates of T. gondii 84 ; , Plasmodium spp. 120, 128, 129 ; , and Pneumocystis 133 ; . Resistance may be conferred by single amino acid substitutions, and study of these resistant isolates has been helpful in obtaining an understanding of the mechanism of action of atovaquone. Mutations in the cytochrome b gene may occur at higher rates since the gene is located in the mitochondrial genome, which is subject to less efficient proofreading than genes in the nuclear genome. The clinical significance of gene mutations has not been determined in Pneumocystis 67 ; , but in malaria the concern about the development of resistance contributed to the addition of proguanil to atovaquone. The use of atovaquone given with the macrolide azithromycin for the treatment of babesiosis has recently been studied. Atovaquone's antibabesial mechanism likely involves inhibition of mitochondrial electron transport, although elucidation of this requires further investigation. REVIEW OF CLINICAL TRIALS P. carinii. Pneumonia caused by P. carinii is a common and potentially fatal opportunistic infection in immunocompromised patients. Prior to the use of highly active antiretroviral therapy, PCP affected nearly 75% of all AIDS patients at some point in their course 94 ; . Even in the era of highly active antiretroviral therapy there remains a substantial morbidity and mortality from PCP in human immunodeficiency virus.
Complicated by grade 3 diarrhea from recently instituted oral topotecan. Table 2 shows a summary of cardiac assessment results.
After starting an antipsychotic After a change in the dose of the antipsychotic Once a patient has been symptomatically stable on the same dose of antipsychotic for 1 month, to monitor for continued therapeutic benefit and tolerability Once a patient is in maintenance treatment i.e., has been stable on the same antipsychotic medication for at least 6 months ; , to monitor for continued therapeutic benefit and tolerability.
Tion that mitochondria in malaria parasite act mainly to serve as an electron disposal sink for dihydroorotate dehydrogenase, a critical enzyme in pyrimidine biosynthesis 79 ; . It well established through studies in other systems that, in addition to oxidative phosphorylation, mitochondria are also central to many other physiological activities such as the metabolism of molecules such as amino acids, lipids, and heme, as well as intracellular Ca2 homeostasis 10 ; . These functions are achieved by the action of gene products encoded by both mitochondrial and nuclear genomes. Because most of the mitochondrial proteins are encoded by the nuclear genome and imported into mitochondria, an active import mechanism is necessary for mitochondrial functions. Both metabolites and protein transport require maintenance of membrane potential across the inner mitochondrial membrane 11, 12 ; . The mitochondrial electron transport chain serves to generate this membrane 1 potential 11 ; . Hence, maintenance of m is critical not only for ATP synthesis but also for the maintenance of additional metabolic activities of mitochondria. While it is not established which of the non-ATP synthesis functions are present in malarial parasites, it is safe to assume that these are likely to be critical for parasite physiology. Approaches for investigating mitochondrial functions in malarial parasite are quite limited at present. Mitochondrial DNAs of various Plasmodium spp. have been sequenced and found to encode at least three components of the electron transport chain, viz. subunits 1 and 3 of cytochrome c oxidase, and apocytochrome b 1316 ; . In addition, mitochondrial preparations have been shown to contain ubiquinone cytochrome c oxidoreductase bc1 complex ; 17 ; , and cytochrome c oxidase activities 18 20 ; . However, detailed studies of mitochondrial functions and their response to antimalarial drugs have been hampered by the technical difficulties of obtaining workable quantities of functional mitochondria. To circumvent these problems, we have explored the possibility of studying mitochondrial functioning in intact parasitized erythrocytes with a fluorescent activated cell scanner FACS ; . We have used the ability of the lipophilic cationic fluorescent probe DiOC6 3 ; to partition into energized mitochondria as a measure of m. By using this assay, we were able to demonstrate that a new antiparasitic drug, atovaquone, rapidly collapses m in erythrocytes infected with a rodent malaria parasite Plasmodium yoelii.
Stability of the isolated C-bromfenac glucoside incubated at various pH, from 4 to 8, for 2 hr at 37C was investigated. At pH 4, the compound was almost completely degraded to bromfenac, with some lactam also evident. At pH 6, approximately 50% of the conjugate was degraded to bromfenac, while 50% remained unchanged. At pH 8, very little degradation was noted; the profile is similar to that of the untreated control. Mass Spectrometry of Bromfenac Conjugate. In the ESI LC MS spectrum of the 14C-bromfenac conjugate, the base peak was the molecular ion and was observed at m z 496 498, [M-H] . In the spectrum of the 14C-aglycone resulting from hydrolysis of the conjugate, the molecular ion was also the base peak and was observed at m z 334 336, [M-H] . The only other prominent ion pair in the spectrum, resulting from loss of the carboxyl group, was observed at m z 290 292, [M-COOH] . The ESI LC MS spectrum of a bromfenac standard was similar to that of the 14C-aglycone; the base peak was the molecular ion, which was observed at m z 332 334, [M-H] , and the loss of the carboxyl group was observed at m z 288 290, [MCOOH] . As the specific activity of the 14C-bromfenac utilized for this study was approximately 85%90% of the theoretical maximum, an isotope effect was observed, resulting in a molecular ion for the radioactive compound 2 Da higher than that observed with the nonradioactive standard. With the exception of the 2-Da shift, the two spectra were identical, indicating that the aglycone from the isolated conjugate was 14C-bromfenac. The GC retention times of the TMSglucose standard and the silylated conjugating moiety after hydrolysis of isolated conjugate were similar at 10.4 and 10.3 min, respectively. The CI GC MS spectra of the silylated standard and hydrolyzed conjugate were nearly identical, with the molecular ion observed in both spectra at m z 558, [M NH4] , representing the ammonia adduct of fully silylated glucose. Ions were also observed in both spectra at m z 468, m z 378, m z 288, and m z 198, representing loss of 1, 2, 3, and 4 O-trimethylsilyl groups, respectively. Mass Spectrometry of Ethyl Esters. The atmospheric pressure CI mass spectra of bromfenac, AHR-11779, the non-radioactive isolated conjugate purity 97%, based on HPLC analysis with detection at 270 nm ; , and the ethyl ester of the isolated conjugate purity 98% ; are shown in fig. 1, panels A-D, respectively. In spectra not shown ; of the conjugate and its ethyl ester obtained without CID, the base peak in both spectra was the molecular ion, [M H] , at m 496 498 and m z 524 526, respectively, with very weak fragment ions. In the CID spectra of bromfenac standard fig. 1, panel A ; , fragments were observed at m z 316 318 and m z 288 290, representing loss of water and loss of the carboxyl moiety, respectively. In the CID spectra of AHR-11779, fig. 1, panel B ; , fragments were again observed at m z 316 318 and m z 288 290, representing loss of ethanol and loss of the ethyl ester moiety, respectively. The most prominent fragments in the CID spectra of the conjugate and its ethyl ester were observed at m z 334 336 and m z 362 364, respectively, representing loss of the glucose moiety, [MH-C6H11O5 H] . This fragmentation pattern indicated that conjugation is through an N-linkage, as it is expected that loss of the glucose moiety in an O-linked glucoside would result in loss of an additional oxygen from the carboxyl moiety, [MHHOC6H11O5] at m z 320 322 and m z 348 350, respectively, as was observed in the loss of ethanol from the AHR-11779 fig. 1, panel B ; . The fragmentation patterns of the conjugate and its ethyl ester fig. 1, panels C, D ; indicate that in the reaction of the conjugate with ethyl iodide, the ethyl group was added to the carboxyl moiety and not to the amine, as the CID mass spectrum of the ethyl ester of the conjugate is nearly identical to that of the authentic standard AHR11779, the ethyl ester of bromfenac fig. 1, panel B ; , providing further supporting evidence that the glucoside is N-linked.
C D FIG. 1. A ; Restoration of hydrogen-dependent sulfide production by ubiquinone Qlo. Lanes: A, sulfide production by untreated membranes; B, sulfide production by membranes exposed to UV light for 1 h; C, reconstitution of sulfide production in UV-treated membranes by ubiquinone Qlo added to UV-treated membranes as an ethanolic solution D, ubiquinone Qlo exposed to UV radiation for 1 h before the UV-treated membranes were added. B ; Restoration of hydrogen-dependent sulfide production by purified P. brockii quinone. Lanes: A, untreated membranes; B, sulfide production by UV-irradiated membranes; C, reconstitution of sulfide production in UV-treated membranes by TLC-purified P. brockii quinone; D, UV-irradiated P. brockii quinone added to UV-treated membranes and ursinus.
FIG. 8. Possible model of proton transport by the ubiquinone associated with glucose dehydrogenase in thecytoplasmic membrane of E. co2i. Glucose dehydrogenase shadowed ; with PQQ striped ; oxidizes glucose to gluconate to transfer electrons to ubiquinone Q ; .Subsequently, ubiquinone takes up protons from the periplasmic side and releases them to theperiplasmic side.
Ubiquinone coenzyme q10
Fulness in allowing the semiquantitative analysis of the redox behavior of the metal centers and intrinsic ubiquinone in QCR, and in predicting the kinetic mechanism that controls the electron flow. This approach will become a powerful tool in studying the molecular mechanism of energy conservation if elaborated for more rigorous and quantitative treatment of the dynamic data and valcyte.
For differentiation along specific lineages. The major endogenous sources of hematopoietic growth factors include fibroblasts, endothelial cells, lymphocytes, monocytes, and macrophages.3-5 Some growth factors e.g., GM-CSF ; appear to have a rather broad array of action on very early hematopoietic progenitors, leading to multilineage increases in hematopoietic cell production differentiation, while others e.g., G-CSF ; seem to act mainly on more terminally differentiated cell types, producing fairly incisive changes in specific committed populations, such as neutrophils. GRANULOCYTE COLONY-STIMULATING FACTOR Granulocyte colony-stimulating factor is made predominantly by endothelial cells, monocytes, and fibroblasts.5-7 The main biologic effect of G-CSF is to cause an increase in proliferation and differen166.
These reports went so far as to state that the two activities were functions of the same enzyme 16, 37 ; . This was shown not to be the case, however, when pyridine dinucleotide transhydrogenase was purified to homogeneity and the purified enzyme characterized 26, 27, 38 ; . We would like to suggest that the association of the two activities in isolated complex I does not represent a naturalassociation in thenative membrane state, but rather is an artifact of isolation. We have been led to this conclusion because of the following: a ; sulfhydryl protecting reagents such as P-mercaptoethanol or dithiothreitol are not used in the preparation of complex I I ; , b ; these sulfhydryl protecting reagentshave always been reported to be used in the preparation of pyridine dinucleotide transhydrogenase from submitochondrial particles 21, 25, 26, ; , and c ; the amino acid composition of pyridine dinucleotide transhydrogenase shows the presence of approximately 10 half-cysteine residues monomer unit 21 ; . These observations, taken together, indicate that, during the isolation and purification of complex I, a small amount of pyridine dinucleotide transhydrogenase become disulfide linked to the enzyme along with the unidentified 69-kDa polypeptide. However, most of the transhydrogenase activity remains free and fractionates away from NADH + ubiquinone reductase. Pyridine dinucleotide transhydrogenase has been purified from submitochondrial particles in the absence of sulfhydryl protecting agents' and shown to be homogeneous by sodium dodecyl sulfate-gel electrophoresis. This observation lends more support to our contention that the small amount of NADPH + AcPyAD + transhydrogenase activitywe find disulfide linked to the complex I preparation is simply an artifact of isolation and does not represent a natural association of the two enzymes within the mitochondrial inner membrane. Since small amounts of pyridine dinucleotide transhydrogenase do appear to be disulfide linked to complex I, one might wonder why the transhydrogenase polypeptide was not identified in gels of NADH-mbiquinone reductase. A logical explanation for this is that a 12.5% acrylamide gel system was used in most of the studies of complex I 6-10 ; and pyridine dinucleotide transhydrogenase would probably not enter that gel but remain on the top. Careful examination of some of the gel scans in earlier work does reveal material a t the top of the gels which could be transhydrogenase. It is interesting to speculate on the identity of the 69-kDa polypeptide found disulfide linked to the two complex I subunits and pyridine dinucleotide transhydrogenase see Fig. 1B ; .The most likely candidates would benormal components of the mitochondrial inner membrane. There are two polypeptides of the same molecular mass known in the inner membrane: a ; the large FMN containing subunit of complex I1 40, 41 ; , and b ; subunit 2 of complex V 42 ; . this time, however, antibodies are notavailable to these individual components to prove or disprove the identity of this polypeptide. Complex I contains both FMN and six iron-sulfur redox centers 43 ; . Three of the iron-sulfur centers fractionatewith the flavoprotein fraction 5 ; , and one with the iron-sulfur protein fraction 2 ; , leaving unaccounted for two iron-sulfur redox centers. These centers appear be too labile to survive to the subfractionation of the enzyme, and are probably in the insoluble protein fraction. Presumably electron transfer from NADH to ubiquinone requires the participation of all six redox centers. Ubiquinone has been postulated to be reduced on the outer surface of the enzyme, i.e. by contact with the insoluble protein fraction shell according to the model of Ragan and co-workers 7, 14 ; , and iron-sulfur center N-2 is and valdecoxib.
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In choosing the Year 2000 recipient, the staff and campers were asked for nominations. Each individual who worked at making camp a success was named! What an awesome task to have to choose just one!!! So, with big elephant tears, the J. Meyers Award was presented to the staff of Pinecrest Adventure Camp 2000. Together they made camp an absolute success that will remain in the minds and memories of all who were touched by camp. So to each of the Camp staff, I say a personal thank-you. Rita's article thanks and names each person individually. And so I want to say a special thank-you to Rita for continuing to provide such wonderful and delicious food! I heard, more than once, I never eat fish at home but this is great!!! Rita you were awesome.
RESULTS Isolation of mutants. The conditions for the antibiotic resistance screen were established by using strain W3110 and the mutants obtained from I. G. Young, including AN162, AN163, AN211, and AN385 Table 1 ; . Optimal antibiotic concentrations were determined by the gradient plate technique in order to test a wide range of concentrations, followed by the antibiotic sensitivity disk assay described above. The mutants, but not the parental strain W3110, were resistant at the lower levels tested, with resistance decreasing in the order neomycin, kanamycin, and gentamicin. Based on these results, we decided to use the following concentrations: neomycin, 40 p.g per plate; kanamycin, 30 p.g per plate; and gentamicin, 20 p.g per plate. The final levels were confirmed with a trial experiment by using the mutants of I. G. Young under mutagenesis conditions. The three chemical mutagens DES, EMS, and NH40H were chosen to induce a variety of mutations. Following mutagenesis, selection for mutants required that the strain show a Ts phenotype and be resistant to all three antibiotics. Any strain which showed consistent phenotypic behavior through four successive transfers was assigned a strain number and stored as a stable mutant. These strains were tested later for their inability to grow on M9-succinate medium. All mutant strains which were tested further for enzyme activity and total ubiquinone content had the Nmr Kmr Gmr M9-succinate- phenotype. Strains with the Ts and valerian.
Calcium-independent inhibition of glucose transport in PC12 and L6 cells by calcium channel antagonists Timothy D. Ardizzone1, Xiao-Hong Lu1 and Donard S. Dwyer1, 2 Departments of Pharmacology1 and Psychiatry2 LSU Health Sciences Center Shreveport, LA 71130 USA.
In order for the ubiquinone form of coq10 to be properly utilized, it first must be reduced in the body to its active metabolite known as ubiquinol and valganciclovir.
Canfield R, Rosner W, Skinner J, et al: Diphosphonate therapy of Paget's disease of bone. J Clin Endocrinol Metab 44: 96-106, Jan 1977 De Vries HR, Bijvoet OLM: Results of prolonged treatment of.
Pro-Atrial Natriuretic Peptide 1-98 ; Levels. In clinical studies, measurements of plasma levels of pro-atrial natriuretic peptide 198 ; [proANP 198 ; ] proved to be superior to -ANP measurements for the early diagnosis of cardiac dysfunction 24 ; and renal failure 25 ; . The proANP 198 ; test kit is a sandwich ELISA designed for determination of proANP 198 ; levels directly in biologic fluids BI-20892; Biomedica, Vienna, Austria ; intra-assay mean, 427 27 fmol ml; coefficient of variation, 6%; interassay mean, 436 29 fmol ml; coefficient of variation, 7%; detection limit, 50 fmol ml ; . To provide maximal specificity, the kit incorporates a pair of immunoaffinity-purified polyclonal antibodies raised in sheep. The capture antibody, which is specific for proANP 10 19 ; , is coated onto the microtiter plate. The detection antibody, which is specific for proANP 8590 ; , is labeled with biotin. In the first step, the sample and the detection antibody are simultaneously added to the wells. ProANP 198 ; , if present in the sample, binds to the precoated capture antibody and forms a sandwich with the detection antibody. After a washing step, which removes all nonspecifically bound material, a streptavidin-peroxidase conjugate detects the presence of bound detection antibodies. After removal of unbound conjugate through washing, tetramethylbenzidine is added to the wells as a substrate. ProANP 198 ; is quantitated on the basis of an enzymecatalyzed color change, which is detectable with a standard ELISA reader. The amount of color development is directly proportional to the amount of proANP 198 ; present in the samples or standards. Big ET 138 ; Levels. Elevated levels of big ET have been detected in individuals exposed to cardiovascular stress, such as with acute myocardial infarctions 26 ; or during and after graft rejection 27 ; . The big ET 138 ; test kit is an ELISA designed for determination of big ET levels directly in plasma BI-20072; Biomedica ; intra-assay mean, 6.7 0.26 fmol ml; coefficient of variation, 3.9%; interassay mean, 6.5 0.39 fmol ml; coefficient of variation, 6.1%; detection limit, 0.05 fmol ml ; . No extraction or concentration steps are necessary. To provide maximal sensitivity, the kit incorporates an immunoaffinity-purified polyclonal capture antibody and a monoclonal detection antibody rabbit anti-big ET antibody ; , which are both highly specific for big ET 138 ; . In the first step, the sample and the monoclonal detection antibody are simultaneously added to the wells. Big ET, if present in the sample, binds to the precoated capture antibody and forms a sandwich with the detection antibody. After a washing step, which removes all nonspecifically bound material, a peroxidase-conjugated antibody detects the presence of bound detection antibodies. After removal of unbound conjugate through washing, tetramethylbenzidine is added to the wells as a substrate. Big ET is quantitated on the basis of an enzyme-catalyzed color change, which is detectable with a and vancomycin.
Moving the eye with a rotary motion during ablation can also smooth the transition at the margins of the ablation and minimize the refractive change.26 Irregular astigmatism can be avoided by on-axis ablations, ignoring visually insignificant opacities.8 Besides the refractive shifts seen in our study, few other complications were observed. One eye had trace anterior haze that was visually insignificant at 3 months postoperatively and completely resolved by 12 months postoperatively. Two eyes developed DLK after PTK. The episodes of DLK stage 1 and 2 ; resolved without sequelae after treatment and may have been associated with the disruption of the epithelium during PTK. Previous reports of late-onset DLK associated with epithelial defects propose that disruption of the epithelium may attract a leukocytic cellular infiltration in the flap interface via a wound-healing cascade.7 Patients undergoing PTK after LASIK need to be closely monitored for the development of DLK postoperatively. Other complications previously reported in eyes with ABMD after LASIK and in eyes treated with PTK were not seen in our study. In a report of epithelial sloughing secondary to ABMD during LASIK, complications included epithelial ingrowth in 62% of eyes, 67% of which progressed to flap keratolysis.1 No occurrence of epithelial ingrowth or flap melt was seen in our study. The major complications of PTK include delayed reepithelialization, stromal melting, infectious keratitis, reactivation of latent herpes virus, corneal scarring, visually significant subepithelial haze, and recurrence of symptoms.8 No eyes in our study experienced delayed reepithelialization, stromal melting, infections, or scarring. Recurrence rates after PTK for recurrent erosions have been reported from 0% to 42% at follow-up intervals ranging from 2 weeks to 70 months postoperatively.11-19, 23 There were no recurrences of epithelial erosions at last follow-up in our study; all corneas were clear. In the preoperative evaluation for refractive surgery, obtaining a clinical history of symptoms related to ABMD and close examination of the cornea is necessary. It is important to realize, however, that clinical signs in asymptomatic eyes may be absent, and despite meticulous examination, ABMD may be undetected.1 Eyes with ABMD may be initially seen with epithelial sloughing during the microkeratome pass, or may present postoperatively with recurrent erosions, decreased vision, or visual distortions. These eyes are at risk for interface epithelial ingrowth, flap melting, and loss of BSCVA. Such complications limit the results of refractive surgery. Our study suggests that in patients unresponsive to conservative treatment, PTK is a safe and effective method of treatment for symptomatic AMBD occurring after LASIK. Phototherapeutic keratectomy may improve vision and resolve symptoms without adverse outcomes such as visually significant corneal scarring or haze. Further study is needed to investigate the results of PTK after LASIK in a larger sample size for a longer postoperative course to further characterize refractive changes, stability of postoperative refraction, and recurrence rates of symptoms and corneal dystrophic changes and ubiquinone.
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