deuteroporphyrins

..In summary, the present results support the idea that the POA is not the brain site where the HO-CO pathway acts as a fever mediator...

..These data suggest that central HO pathway may activate a control mechanism that attenuates AVP secretion during endotoxemia and may consequently regulate the MAP and diuretic output...

..In conclusion, this study provided firstly the full pharmacokinetic characteristics and mechanisms of deuxemether, which would be helpful for its clinical regiment design...

..Because biliverdine and iron had no thermoregulatory effects and CO produces most of its actions via sGC, these data strongly imply that CO is the only HO product with a pyretic action in the CNS...

..In addition, the transient retention losses observed following administration of ZnBG suggest that CO may be necessary for memory retrieval and not formation as previously thought...

..The results suggest that maximizing heme binding pocket compactness in the apo state is a useful general strategy for increasing the stability of engineered or designed proteins...

..Off-axis tilting, a property associated with ordered (nitrosyl)iron(II) porphyrinates, is also investigated...

..Two groups of mice received different total absorbed doses: 3.00 and 6.01 Gy, but no further improvement in the outcome was found compared to the previous results using BPA alone (4.3 Gy)...

..The kinetics of porphyrin-LDL interactions indicates that changes in the distribution of photosensitizers among various carriers could be very sensitive to the specific tumor microenvironment...

..The most effective sensitizers were 4-(1-methyl-3-hydroxybutyl)- and 4-(1-methyl-2-acetyl-3-oxobutyl)-deuteroporphyrins. Extinction and amphiphilicity were shown to be the most important properties determining photodynamic ..

..The procedure is more adaptable to the problems of eye surgery due to the absence of systemic action on the patient's body...

..The implications of the H-Mg protoporphyrin interaction for the next enzyme in the chlorophyll biosynthetic pathway, Mg protoporphyrin methyltransferase, are discussed...

..The results therefore suggest that the two asymmetric deuteroheme IX isomers, which are inverted about the alpha, gamma-meso carbon axis of the heme, also exhibit very similar functions in myoglobin...

..The English version of the paper: Russian Journal of Bioorganic Chemistry, 2002, vol. 28, no. 4; see also http://www.maik.ru...

..This novel, indirect antioxidant action might be relevant for the preventive potential of methionine and methionine rich diets under conditions of inflammation and oxidative stress...

..This increases the dwell time of singlet oxygen within the bilayer, which results in greater photodamage to a membrane-residing singlet oxygen target...

..Moreover, inhibition by NO of neutrophil migration was dependent on HO activity...

..These results suggest that hepatic protection in eNOS-TG mice may be mediated in part by NO signaling via the sGC-cGMP pathway and is independent of HO-1 signal transduction pathways...

..Moreover, our findings provide additional perspectives for a possible but yet unexplored use of PPIs in vasoprotection...

..We conclude that the three Mps are absorbed at different rates in the mouse and affect bilirubin production and HO-1 expression in a tissue- and time-dependent manner...

..The resulting formyl derivatives of the porphyrins are of interest for fluorescent immunoassay...

..The whole procedure of titration could be divided into three successive stages. The three-banded profiles of TA4C might be explained according to a loose dimer model...

..8. Other important ratios were tumor/thyroid approximately 6.6 and tumor/lung approximately 2.9. These results open the possibility of improving the efficacy of BNCT for the treatment of this so far "orphan" tumor...

..These results identify new inhibitors of murine and ovine PrP-res formation and reinforce the idea that compounds effective against PrP-res from one species or strain cannot be assumed to be active against others...

..CONCLUSIONS: Our study demonstrates that changing the method of BOPP delivery from i.v. to CED significantly enhances the boron concentration in tumors and produces very favorable tumor/brain and tumor/blood ratios...

..PCI has been shown to potentiate the biological activity of a large variety of macromolecules. The comprehension of the mechanisms governing this particular sub-cellular localization could allow the design of better candidates for PCI...

..We conclude that the CO/HO system plays an important role in cardiovascular regulation by modulating sympathetic tone...

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..The characterization of these compounds confirms the synthetic methodology. Compared with conventional methods, the main advantages of the present procedure are shorter reaction time and higher yields...

..Hence, when considering outcomes of photodynamic action in cells and tissue, bystander effects may be significant, especially at sublethal fluences...

..The present study investigates whether the cardioprotection achieved by gene delivery of hypoxia-inducible factor-1 alpha (HIF-1 alpha) depends on the downstream factor haem oxygenase (HMOX)-1...

..Therefore, constitutive carbon monoxide release seems to have two indirect effects on the hypothalamic circulation: vasodilation mediated by PGE2 and vasoconstriction as a result of NOS inhibition...

..3 nmol). Taken together, these data suggest that CO in the LC produced by the HO pathway and acting via cGMP is implicated in thermal responses to restraint...

..These findings strongly indicate that the HO pathway plays a spinal antinociceptive role during the formalin test, acting via cGMP...

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..Moreover dogs with spontaneous UTC also have a selective uptake of BPA. At the present we are studying the biodistribution of BPA in patients with UTC before its application in humans...

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..Our results indicate that endogenous CO reduces the resting CBF via inhibition of NOS but fails to influence the CBF response to hypoxia and hypercapnia in adult rats...

..Collectively, the data suggest that radical formation at the distal tryptophan position is not an exclusive feature of the KatG enzymes and may be used more widely across other members of the class I heme peroxidase family...

..These results indicated that the heme orientational disorder could exert little effect, if any, on the O(2) affinity properties of Hb A. This finding provides new insights into structure-function relationship of Hb A...

..rubrum when using red light...

..These findings strongly indicate that CO is the HO pathway product that plays an antinociceptive role during the formalin test, acting via cGMP...

..Since the use of porphyrins either as active photosensitizers or in combination with antibiotics may have therapeutic value for controlling bacterial growth in vivo, it is important to compare the binding of heme derivatives to HmuY...

..However, in the crystal structure, intrachain Glu1-Arg9 ion pairs are preferred over the designed, and experimentally found in solution, interchain interactions. This ion pairing switch may be related to strong packing interactions...

..A promising deuteroporphyrin that can inactivate bioactive A beta species was also identified using this assay. These novel insights and findings should have important implications for the treatment of AD...

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..and careful examination of the fluorescence excitation spectra show that the dimers of disulfonated deuteroporphyrins do not fluoresce at all...

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..As exemplified with VD and EVD, they also point out the reaction of singlet oxygen as an efficient route to chlorin-type photosensitizers...

..The charge-neutralization results further suggest that b(5) binds over a broad area of the subunit face, but reacts only in a minority population of binding geometries...

..The study points to the importance of combining photosensitizer uptake and localization with photophysical measurements in the relevant biological milieu to reasonably interpret and/or predict photosensitization efficacies...

..Suppression of basal HO activity and the IAS smooth muscle relaxation induced by NANC nerve stimulation or VIP but not NO suggest that some of the stimuli that cause IAS smooth muscle relaxation may involve HO activity...

..The significant inhibition of TSE disease by structurally dissimilar tetrapyrroles identifies these compounds as anti-TSE drugs...

..FANFT cells are protected from direct cell kill mediated by this drug, suggesting that the substantial delay in tumor regrowth from this tumor/sensitizer combination can be attributed to vascular effects...

..7 (mumole/kg and 200 J/cm2. These results indicate that iminium salts have characteristics that may make them promising third-generation photosensitizers...

..When the protein concentration is high photoinactivation efficiency depends on the type of protein present in the medium...

..The ensuing steps, probably involving an oxygen free radical and porphyrin radical intermediates, consume a large amount of O2 to oxidize Deutero into chlorin...

..Accordingly, the pressor effect of ZnDPBG may rely on inhibition of carbon monoxide production in the NTS. This implies that carbon monoxide formed by brain heme oxygenase plays a role in the central regulation of arterial pressure...

..Therefore, the presence of the mutant ferrochelatase protein did not inhibit the ferrochelatase activity expressed by the transgene...

..These observations demonstrate that HO-1 modulates fetal growth by its effects on placental growth factors...

..Conformably, i.c.v. heme-lysinate did not affect VE as well. These results do not support the hypothesis that the HO-CO pathway in the central nervous system is involved in hypoxia-induced hyperventilation...

..Among the known inhibitors of HO enzyme activity that were evaluated in this study, ZnBG did not significantly affect HO-1 transcription and therefore may be well suited for the prevention of neonatal jaundice...

..The dynamics of the interactions of photosensitizers with membranes appears as an important determinant of their subcellular localization...

..These results offer the ingredients for a future treatment of fungal infections, including those of the nail...

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..A study was undertaken to examine the effects of the HO inhibitor Zn-deuteroporphyrin-IX-2,4-bisethylene glycol (Zndtp) on the development of pulmonary fibrosis in the bleomycin model of lung injury and repair...

..They also indicate that the propensity of these molecules to self-associate at low pH could yield to some retention in acidic intracellular vesicles of the endosome/lysosome compartment...

..These results suggest that the activities of NOS and HO could influence experimental metastasis in an organ-specific manner...

..These results indicate that the interaction between carbon monoxide and adenosine may contribute to the activation of heme oxygenase in central cardiovascular regulation...

..Of 9 pts with recurrent GBM, the median OS was 11 months (3-38+), with 56% surviving at least 12 months. In conclusion, BOPP photodynamic therapy was associated with encouraging survival particularly in the recurrent GBM setting...

..It was shown that the beta values for dyes I and II are 86 and 61% and correlate with the coefficients of distribution of the dyes in the octanol/water system (20.7 and 17.0, respectively)...

..Our data indicate that the NO but not the CO pathway participates in PDGF-BB fever. Furthermore, our data show that nNOS is the NOS isoform responsible for NO synthesis in this response...

..While some proteins involved with heme capture bind directly to the iron center, the HA2 domain of P. gingivalis recognizes heme by a mechanism that is solely porphyrin mediated...

..GUN4 binds the product and substrate of Mg- chelatase, an enzyme that produces Mg-Proto, and activates Mg-chelatase. Thus, GUN4 participates in plastid-to-nucleus signaling by regulating Mg-Proto synthesis or trafficking...

..They also suggested that CO and excitatory amino acids may interact in the nucleus tractus solitarii of rats...

..The data show that BOPP is more dose effective in vivo by a factor of 10 than the current clinically used photosensitizer hematoporphyrin derivative and suggest that BOPP may have potential as a dual PDT/BNCT sensitizer...

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..The most recent PDT meeting, sponsored by the International Photodynamic Assn, has more than 600 participants. ..

..If the results of preliminary studies are borne out by further investigation, UDCA could offer a safe and effective means for promoting clinical PDT efficacy. ..

..Collaborative arrangements with Drs. Reiners (co- investigator) and Kim (consultant) continue arrangements that have been productive during the previous interval of support. ..

..Information on mechanisms of cell death pathways and their role in cancer control is also expected to assist in drug development and to provide better understanding of the role of death pathways in cancer control. ..

..Information on mechanisms of cell death pathways and their role in cancer control is also expected to assist in drug development and to provide better understanding of the role of death pathways in cancer control. ..

..Porphyrins provided via a sub-contract at the University of California (Davis) will represent an approach to the directed design of new agents with a view toward the improvement of clinical phototherapy...

..An understanding of the determinants of selective localization and photosensitization will represent a useful contribution to our knowledge of tumor cell biology...

..g., study of transport phenomena, membrane protein cross-linking, cell-surface charge & hydrophobicity, and fluorescence signals form porphyrins in cell-free systems and within tumor cells...

..Optimal targets for PDT remain to be identified. ..