The protein apoptotic protease activating factor 1 (Apaf1) is the central component of the apopto... more The protein apoptotic protease activating factor 1 (Apaf1) is the central component of the apoptosome, a multiprotein complex that activates procaspase-9 after cytochrome c release from the mitochondria in the intrinsic pathway of apoptosis. We have developed a vital method that allows fluorescence-activated cell sorting of cells at different stages of the apoptotic pathway and demonstrated that upon pharmacological inhibition of Apaf1, cells recover from doxorubicin- or hypoxia-induced early apoptosis to normal healthy cell. Inhibiting Apaf1 not only prevents procaspase-9 activation but delays massive mitochondrial damage allowing cell recovery.
Four positively charged compounds, previously shown to produce analgesic activity by interacting ... more Four positively charged compounds, previously shown to produce analgesic activity by interacting with prokinecitin receptor or T-type calcium channels, were tested for their ability to inhibit capsaicin-induced elevation of intracellular Ca(2+) elevation in HEK-293 cells stably transfected with the human recombinant TRPV1, with the goal of identifying novel TRPV1 open-pore inhibitors. KYS-05090 showed the highest potency as a TRPV1 antagonist, even higher than that of the open-pore triazine 8aA inhibitor. The latter showed quite remarkable agonist/desensitizer activity at the rat recombinant TRPM8 channel. The activity of KYS-05090 and the other compounds was selective because none of these compounds was able to modulate the rat TRPA1 channel. Open-pore inhibitors of TRPV1 may be a new class of multi-target analgesics with lesser side effects, such as loss of acute pain sensitivity and hyperthermia, than most TRPV1 antagonists developed so far.
ABSTRACT ChemInform is a weekly Abstracting Service, delivering concise information at a glance t... more ABSTRACT ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.
Journal of Liquid Chromatography & Related Technologies, 1986
The relative hydrophobicities of natural precocenes (1e and 1g) and of twenty-five synthetic anal... more The relative hydrophobicities of natural precocenes (1e and 1g) and of twenty-five synthetic analogues have been studied in a reversed-phase HPLC system. Using methanol-water as the mobile phase, a linear relationship of the capacity factor (log k') over a limited range of methanol fraction volumes was established for every solute and log P was related to the extrapolated k'w value
We describe the synthesis of a library of 11,638 N-alkylglycine peptoid trimers in a positional s... more We describe the synthesis of a library of 11,638 N-alkylglycine peptoid trimers in a positional scanning format with adjustment of reaction conditions to account for different reactivity of the monomer building blocks. Evaluation of the library by high-content phenotypic screening for modulators of the cytoskeleton and mitosis resulted in the identification of two apoptosis-inducing peptoids, which despite their structural similarity target different proteins and cellular mechanisms. Whereas one peptoid binds to nuclear transport mediating karyopherins, the other N-alkylglycine trimer binds tubulin at the Vinca alkaloid binding site.
The peptide, Ala-Pro-Ala-Arg (APAR), was selected from the screening of a tetrapeptide combinator... more The peptide, Ala-Pro-Ala-Arg (APAR), was selected from the screening of a tetrapeptide combinatorial synthetic library as the ligand for affinity purification of an anti-Granulocyte Macrophage-Colony Stimulating Factor (GM-CSF) monoclonal antibody (Mab) developed in mouse ascitis. The affinity chromatographic matrix obtained by attachment of APAR to agarose, having a peptide density of 0.5 micromol ml(-1), showed a maximum capacity of 9.1 mg Mab ml(-1) and a dynamic capacity of 3.9 mg Mab ml(-1). A 95% yield of electrophoretically pure anti-GM-CSF was obtained in a single step.
The potentiation of central cholinergic activity has been proposed as a therapeutic approach for ... more The potentiation of central cholinergic activity has been proposed as a therapeutic approach for improving cognitive function in patients with Alzheimer's disease. Increasing the acetylcholine concentration in brain by modulating acetylcholinesterase (AChE) activity is among the most promising strategies. We have used a combinatorial approach to identify different 2,5-piperazinediones (DKP) with AChE inhibitory activity. Our goal was to find inhibitors exhibiting high AChE/BuChE (butyrylcholinesterase) selectivity, in order to reduce the undesirable side effects elicited by most of the inhibitors that have been developed to date. Screening of a DKP library constructed on solid-phase using the multiple parallel synthesis format, resulted in the identification of several compounds with moderate efficacy on AChE. In particular, DKP-80 had an IC50 = 2.2 microM with no significant inhibitory activity on BuChE. Moreover, estimated values of Clog P and log BB for the most active compou...
ABSTRACT ChemInform is a weekly Abstracting Service, delivering concise information at a glance t... more ABSTRACT ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.
ABSTRACT ChemInform is a weekly Abstracting Service, delivering concise information at a glance t... more ABSTRACT ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.
A study on the reaction mechanism for the conversion of title esters, the species recognised as t... more A study on the reaction mechanism for the conversion of title esters, the species recognised as toxic biomarkers of the oil batches responsible for the Toxic Oil Syndrome, into the corresponding anilides under the thermal conditions of an oil deodorisation process was performed using experimental and computational techniques. The results obtained suggest a reaction course that includes two basic steps:
... Chapter 4 Molecules That Bind a Central Protein Component of the Apoptosome, Apaf-1, and Modu... more ... Chapter 4 Molecules That Bind a Central Protein Component of the Apoptosome, Apaf-1, and Modulate Its Activity Laura Mondragón, Mar Orzáez, Anna Gortat, Monica Sancho, Angel Messeguer, María Jesús Vicent, and Enrique Pérez-Payá ...
Journal of the Chemical Society, Chemical Communications, 1995
ABSTRACT A neat and high yield chemoselective epoxidation of alkene moieties present in tertiary ... more ABSTRACT A neat and high yield chemoselective epoxidation of alkene moieties present in tertiary amines is accomplished by treatment of the corresponding amine–boron trifluoride adduct with dimethyldioxirane or methyl(trifluoromethyl)dioxirane.
Toxic oil syndrome (TOS) was described in Spain in 1981, due to the ingestion of contaminated rap... more Toxic oil syndrome (TOS) was described in Spain in 1981, due to the ingestion of contaminated rapeseed oil denatured with 2% aniline. More than 20,000 persons were affected, causing over 2500 deaths. Immunological findings were: eosinophilia, mRNA for Th2 cytokines (IL-4 and IL-5) in lungs, elevated total IgE and sIL-2R and increase of DR2 HLA class II phenotypic frequency in patients died by TOS. Our objective is to test the genetic restriction found in humans using HLA transgenic mice. Results show that mice expressing human DR2 and DQ6 (both in linkage disequilibrium), had higher percentage of eosinophils (DQ6) and IgE (DR2) than other transgenic mice tested (DR3 and DR4). Also, a Th2 shift was found in DR2 transgenic mice when toxic oil was administered with OVA. This has been corroborated by the IL-5 mRNA expression in 4 out of 6 lung tissues from TOS oil treated BALB/c mice. These data indicate that an immunological response was induced as consequence of the toxic administration. These results correlate with those found in TOS patients and reinforce the implication of genetic restrictions in the acquisition of toxic-mediated disease.
The protein apoptotic protease activating factor 1 (Apaf1) is the central component of the apopto... more The protein apoptotic protease activating factor 1 (Apaf1) is the central component of the apoptosome, a multiprotein complex that activates procaspase-9 after cytochrome c release from the mitochondria in the intrinsic pathway of apoptosis. We have developed a vital method that allows fluorescence-activated cell sorting of cells at different stages of the apoptotic pathway and demonstrated that upon pharmacological inhibition of Apaf1, cells recover from doxorubicin- or hypoxia-induced early apoptosis to normal healthy cell. Inhibiting Apaf1 not only prevents procaspase-9 activation but delays massive mitochondrial damage allowing cell recovery.
Four positively charged compounds, previously shown to produce analgesic activity by interacting ... more Four positively charged compounds, previously shown to produce analgesic activity by interacting with prokinecitin receptor or T-type calcium channels, were tested for their ability to inhibit capsaicin-induced elevation of intracellular Ca(2+) elevation in HEK-293 cells stably transfected with the human recombinant TRPV1, with the goal of identifying novel TRPV1 open-pore inhibitors. KYS-05090 showed the highest potency as a TRPV1 antagonist, even higher than that of the open-pore triazine 8aA inhibitor. The latter showed quite remarkable agonist/desensitizer activity at the rat recombinant TRPM8 channel. The activity of KYS-05090 and the other compounds was selective because none of these compounds was able to modulate the rat TRPA1 channel. Open-pore inhibitors of TRPV1 may be a new class of multi-target analgesics with lesser side effects, such as loss of acute pain sensitivity and hyperthermia, than most TRPV1 antagonists developed so far.
ABSTRACT ChemInform is a weekly Abstracting Service, delivering concise information at a glance t... more ABSTRACT ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.
Journal of Liquid Chromatography & Related Technologies, 1986
The relative hydrophobicities of natural precocenes (1e and 1g) and of twenty-five synthetic anal... more The relative hydrophobicities of natural precocenes (1e and 1g) and of twenty-five synthetic analogues have been studied in a reversed-phase HPLC system. Using methanol-water as the mobile phase, a linear relationship of the capacity factor (log k') over a limited range of methanol fraction volumes was established for every solute and log P was related to the extrapolated k'w value
We describe the synthesis of a library of 11,638 N-alkylglycine peptoid trimers in a positional s... more We describe the synthesis of a library of 11,638 N-alkylglycine peptoid trimers in a positional scanning format with adjustment of reaction conditions to account for different reactivity of the monomer building blocks. Evaluation of the library by high-content phenotypic screening for modulators of the cytoskeleton and mitosis resulted in the identification of two apoptosis-inducing peptoids, which despite their structural similarity target different proteins and cellular mechanisms. Whereas one peptoid binds to nuclear transport mediating karyopherins, the other N-alkylglycine trimer binds tubulin at the Vinca alkaloid binding site.
The peptide, Ala-Pro-Ala-Arg (APAR), was selected from the screening of a tetrapeptide combinator... more The peptide, Ala-Pro-Ala-Arg (APAR), was selected from the screening of a tetrapeptide combinatorial synthetic library as the ligand for affinity purification of an anti-Granulocyte Macrophage-Colony Stimulating Factor (GM-CSF) monoclonal antibody (Mab) developed in mouse ascitis. The affinity chromatographic matrix obtained by attachment of APAR to agarose, having a peptide density of 0.5 micromol ml(-1), showed a maximum capacity of 9.1 mg Mab ml(-1) and a dynamic capacity of 3.9 mg Mab ml(-1). A 95% yield of electrophoretically pure anti-GM-CSF was obtained in a single step.
The potentiation of central cholinergic activity has been proposed as a therapeutic approach for ... more The potentiation of central cholinergic activity has been proposed as a therapeutic approach for improving cognitive function in patients with Alzheimer's disease. Increasing the acetylcholine concentration in brain by modulating acetylcholinesterase (AChE) activity is among the most promising strategies. We have used a combinatorial approach to identify different 2,5-piperazinediones (DKP) with AChE inhibitory activity. Our goal was to find inhibitors exhibiting high AChE/BuChE (butyrylcholinesterase) selectivity, in order to reduce the undesirable side effects elicited by most of the inhibitors that have been developed to date. Screening of a DKP library constructed on solid-phase using the multiple parallel synthesis format, resulted in the identification of several compounds with moderate efficacy on AChE. In particular, DKP-80 had an IC50 = 2.2 microM with no significant inhibitory activity on BuChE. Moreover, estimated values of Clog P and log BB for the most active compou...
ABSTRACT ChemInform is a weekly Abstracting Service, delivering concise information at a glance t... more ABSTRACT ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.
ABSTRACT ChemInform is a weekly Abstracting Service, delivering concise information at a glance t... more ABSTRACT ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.
A study on the reaction mechanism for the conversion of title esters, the species recognised as t... more A study on the reaction mechanism for the conversion of title esters, the species recognised as toxic biomarkers of the oil batches responsible for the Toxic Oil Syndrome, into the corresponding anilides under the thermal conditions of an oil deodorisation process was performed using experimental and computational techniques. The results obtained suggest a reaction course that includes two basic steps:
... Chapter 4 Molecules That Bind a Central Protein Component of the Apoptosome, Apaf-1, and Modu... more ... Chapter 4 Molecules That Bind a Central Protein Component of the Apoptosome, Apaf-1, and Modulate Its Activity Laura Mondragón, Mar Orzáez, Anna Gortat, Monica Sancho, Angel Messeguer, María Jesús Vicent, and Enrique Pérez-Payá ...
Journal of the Chemical Society, Chemical Communications, 1995
ABSTRACT A neat and high yield chemoselective epoxidation of alkene moieties present in tertiary ... more ABSTRACT A neat and high yield chemoselective epoxidation of alkene moieties present in tertiary amines is accomplished by treatment of the corresponding amine–boron trifluoride adduct with dimethyldioxirane or methyl(trifluoromethyl)dioxirane.
Toxic oil syndrome (TOS) was described in Spain in 1981, due to the ingestion of contaminated rap... more Toxic oil syndrome (TOS) was described in Spain in 1981, due to the ingestion of contaminated rapeseed oil denatured with 2% aniline. More than 20,000 persons were affected, causing over 2500 deaths. Immunological findings were: eosinophilia, mRNA for Th2 cytokines (IL-4 and IL-5) in lungs, elevated total IgE and sIL-2R and increase of DR2 HLA class II phenotypic frequency in patients died by TOS. Our objective is to test the genetic restriction found in humans using HLA transgenic mice. Results show that mice expressing human DR2 and DQ6 (both in linkage disequilibrium), had higher percentage of eosinophils (DQ6) and IgE (DR2) than other transgenic mice tested (DR3 and DR4). Also, a Th2 shift was found in DR2 transgenic mice when toxic oil was administered with OVA. This has been corroborated by the IL-5 mRNA expression in 4 out of 6 lung tissues from TOS oil treated BALB/c mice. These data indicate that an immunological response was induced as consequence of the toxic administration. These results correlate with those found in TOS patients and reinforce the implication of genetic restrictions in the acquisition of toxic-mediated disease.
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Papers by Angel Messeguer