Heidy Pacheco - Academia.edu (original) (raw)

Papers by Heidy Pacheco

Medicinal Chemistry Research, 2017

In recent years, it has been shown that histone deacetylase 2 (HDAC2) inhibitors increase histone... more In recent years, it has been shown that histone deacetylase 2 (HDAC2) inhibitors increase histone acetylation and enhance memory processes, probably due to an increase in the gene transcription rate that emerges during memory formation. Histone acetylation generally favors long-term memory, whereas histone deacetylation impinges on it. However, until today there is no specific drug that can target the HDAC2 active site. In this work we applied the method of rational drug design, through enzyme-structuralchemical properties to generate new molecules as HDAC inhibitors. By the application of Quantitative Structure-Activity Relationship (QSAR) and molecular modeling methodologies our aim is to predict more potent HDAC inhibitors. 76 small molecules with potential activity were analyzed using QSAR methodology. The best model was constructed by merging the properties of electronegativity, atomic mass, polarizability, van der Waals forces and some conformational aspects, with the following statistical parameters: r 2 = 0.8935, q 2 LOO-CV = 0.8498, and q 2 LGO-CV = 0.7598. The molecular docking of the ligands on the template was performed by blind docking. The results showed intermolecular interactions between small molecules and some amino acids, such as His145, His146, Asp179, Asp186, and internal-H 2 O and Zn 2+ of which IN01, IN04, and IN14 showed theoretically better biological activity compared with that of TSA and SAHA. Mainly, the IN14 synthesized molecule is a theoretical inhibitor of HDAC class I.

Revista mexicana de ingeniería química

The petrol and diesel combustion in motors produces sulfur and nitrogen oxides, they are the prec... more The petrol and diesel combustion in motors produces sulfur and nitrogen oxides, they are the precursors of acid rain. Unfortunately, the Mexican fuel shows high-sulfur content; this concentration should be reduced to 50 ppmw or lower in order to achieve the international regulations. The oxidative desulfurization (OD) is an alternative to obtain it. In this work, we propose a theoretical reaction mechanism for the OD; this pathway is carried out through a combination of the molibdate anion, the hydrogen peroxide and several dibenzothiophenes by Density Functional Theory (DFT) using the B3LYP functional and the DGDZVP double zeta basis. The results show that the energy of the determinant step of the reaction is lower than the experimental amount obtained wishout catalyst. Finally, the environment provided by water molecules is important for decreasing the reaction mechanism energy.

Journal of Pharmacology and Experimental Therapeutics, 2002

As part of a project to develop treatment agents for cocaine abuse, (Ϯ)-threo-methylphenidate (TM... more As part of a project to develop treatment agents for cocaine abuse, (Ϯ)-threo-methylphenidate (TMP) and 11 analogs were characterized biochemically and behaviorally to assess their potential as anti-cocaine medications. The compounds contained aryl and/or nitrogen substitutions, and/or replacement of the ester function by an alcohol or ether. All of the analogs, except for the N-methyl-substituted compounds, showed increased inhibitory potency against 3 H-(Ϫ)-2-␤-carbomethoxy-3-␤-(4-fluorophenyl)tropane 1,5-naphthalenedisulfonate ([ 3 H]WIN 35,428) ([ 3 H]WIN) binding to the dopamine transporter, compared with TMP. In general, parallel results were obtained for inhibition of [ 3 H]dopamine ([ 3 H]DA) uptake. Although compounds with N-substitutions were proportionally less potent at blocking DA uptake than WIN binding (compared with the unsubstituted compounds), one such compound that was 6-fold more potent against [ 3 H]WIN binding than [ 3 H]DA uptake did not attenuate inhibition by cocaine of synaptosomal [ 3 H]DA transport. The compounds were significantly less potent in displacing [ 3 H]citalopram binding from the serotonin transporter. In cocaine discrimination studies in rats, all but two of the analogs (both N-substituted) completely generalized with the cocaine stimulus. Robust positive correlations were observed between potency in the drug discrimination assay and activity at the dopamine transporter, but not the serotonin transporter. When tested for their ability to alter cocaine discrimination, four of the analogs (three of which had Nsubstitutions and shallow dose-response curves as cocaine substitutes) actually enhanced cocaine discrimination, often at combined doses of cocaine and test compound that were inactive when given separately. Taken together, the results suggest that TMP analogs may have potential as substitution therapies for the treatment of cocaine abuse.

Medicinal Chemistry Research, 2017

In recent years, it has been shown that histone deacetylase 2 (HDAC2) inhibitors increase histone... more In recent years, it has been shown that histone deacetylase 2 (HDAC2) inhibitors increase histone acetylation and enhance memory processes, probably due to an increase in the gene transcription rate that emerges during memory formation. Histone acetylation generally favors long-term memory, whereas histone deacetylation impinges on it. However, until today there is no specific drug that can target the HDAC2 active site. In this work we applied the method of rational drug design, through enzyme-structuralchemical properties to generate new molecules as HDAC inhibitors. By the application of Quantitative Structure-Activity Relationship (QSAR) and molecular modeling methodologies our aim is to predict more potent HDAC inhibitors. 76 small molecules with potential activity were analyzed using QSAR methodology. The best model was constructed by merging the properties of electronegativity, atomic mass, polarizability, van der Waals forces and some conformational aspects, with the following statistical parameters: r 2 = 0.8935, q 2 LOO-CV = 0.8498, and q 2 LGO-CV = 0.7598. The molecular docking of the ligands on the template was performed by blind docking. The results showed intermolecular interactions between small molecules and some amino acids, such as His145, His146, Asp179, Asp186, and internal-H 2 O and Zn 2+ of which IN01, IN04, and IN14 showed theoretically better biological activity compared with that of TSA and SAHA. Mainly, the IN14 synthesized molecule is a theoretical inhibitor of HDAC class I.

Revista mexicana de ingeniería química

The petrol and diesel combustion in motors produces sulfur and nitrogen oxides, they are the prec... more The petrol and diesel combustion in motors produces sulfur and nitrogen oxides, they are the precursors of acid rain. Unfortunately, the Mexican fuel shows high-sulfur content; this concentration should be reduced to 50 ppmw or lower in order to achieve the international regulations. The oxidative desulfurization (OD) is an alternative to obtain it. In this work, we propose a theoretical reaction mechanism for the OD; this pathway is carried out through a combination of the molibdate anion, the hydrogen peroxide and several dibenzothiophenes by Density Functional Theory (DFT) using the B3LYP functional and the DGDZVP double zeta basis. The results show that the energy of the determinant step of the reaction is lower than the experimental amount obtained wishout catalyst. Finally, the environment provided by water molecules is important for decreasing the reaction mechanism energy.

Journal of Pharmacology and Experimental Therapeutics, 2002

As part of a project to develop treatment agents for cocaine abuse, (Ϯ)-threo-methylphenidate (TM... more As part of a project to develop treatment agents for cocaine abuse, (Ϯ)-threo-methylphenidate (TMP) and 11 analogs were characterized biochemically and behaviorally to assess their potential as anti-cocaine medications. The compounds contained aryl and/or nitrogen substitutions, and/or replacement of the ester function by an alcohol or ether. All of the analogs, except for the N-methyl-substituted compounds, showed increased inhibitory potency against 3 H-(Ϫ)-2-␤-carbomethoxy-3-␤-(4-fluorophenyl)tropane 1,5-naphthalenedisulfonate ([ 3 H]WIN 35,428) ([ 3 H]WIN) binding to the dopamine transporter, compared with TMP. In general, parallel results were obtained for inhibition of [ 3 H]dopamine ([ 3 H]DA) uptake. Although compounds with N-substitutions were proportionally less potent at blocking DA uptake than WIN binding (compared with the unsubstituted compounds), one such compound that was 6-fold more potent against [ 3 H]WIN binding than [ 3 H]DA uptake did not attenuate inhibition by cocaine of synaptosomal [ 3 H]DA transport. The compounds were significantly less potent in displacing [ 3 H]citalopram binding from the serotonin transporter. In cocaine discrimination studies in rats, all but two of the analogs (both N-substituted) completely generalized with the cocaine stimulus. Robust positive correlations were observed between potency in the drug discrimination assay and activity at the dopamine transporter, but not the serotonin transporter. When tested for their ability to alter cocaine discrimination, four of the analogs (three of which had Nsubstitutions and shallow dose-response curves as cocaine substitutes) actually enhanced cocaine discrimination, often at combined doses of cocaine and test compound that were inactive when given separately. Taken together, the results suggest that TMP analogs may have potential as substitution therapies for the treatment of cocaine abuse.