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  1. Article: The in vitro study of interaction between antacids and anti-diabetic drug sitagliptin in the treatment of type II diabetes.

    Tabassum, Nargis / Akram, Arfa / Azizuddin, - / Ahmed, Ateka / Naseem Khan, Muhammad / Ali Khan, Rashid / Azeem, Iffat / Furrukh, Mehwish

    Pakistan journal of pharmaceutical sciences

    2023  Volume 36, Issue 2, Page(s) 373–378

    Abstract: Hyperglycemia is a long-lasting syndrome that occurs either when the pancreas cannot produce enough insulin, or the body cannot effectively utilize that insulin to regulate blood sugar levels. Non-insulin-dependent hyperglycemia, also known as type II ... ...

    Abstract Hyperglycemia is a long-lasting syndrome that occurs either when the pancreas cannot produce enough insulin, or the body cannot effectively utilize that insulin to regulate blood sugar levels. Non-insulin-dependent hyperglycemia, also known as type II diabetes, causes a common consequence of severe damage to many of the body's organs mainly the blood vessels and nerves. The majority of people around the world are suffering from non-insulin-dependent diabetes. The present work showed a great effort to investigate any possible interaction between antacids and sitagliptin (anti-diabetic drug) in the treatment of type II diabetes with gastrointestinal tract problems. The in vitro studies were carried out in simulated gastric juice pH 2.0 and intestinal pH 7.4 at 37oC. MgCO
    MeSH term(s) Humans ; Antacids/therapeutic use ; Sitagliptin Phosphate/therapeutic use ; Diabetes Mellitus, Type 2/drug therapy ; Calcium Carbonate/therapeutic use ; Hyperglycemia/drug therapy
    Chemical Substances Antacids ; Sitagliptin Phosphate (TS63EW8X6F) ; Calcium Carbonate (H0G9379FGK)
    Language English
    Publishing date 2023-06-30
    Publishing country Pakistan
    Document type Journal Article
    ZDB-ID 885131-1
    ISSN 1011-601X
    ISSN 1011-601X
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  2. Article: The LC-QTOF-MS/MS analysis of acid degradation products of Rifaximin, an antibiotic

    Yaseen, Saima Baig / Akram, Arfa / Musharraf, Syed Ghulam / Wajidi, Mehwish / Tabassum, Nargis / Nazir, Nemat / Shah, Syed Muhammad Zaki

    MethodsX. 2022 May 17,

    2022  

    Abstract: Tₕₑ ₚᵣₑₛₑₙₜ ᵣₑₛₑₐᵣcₕ ₐᵢₘₛ ₜₒ ₚᵣₒₚₒₛₑ ₐ ₛᵢₘₚₗₑ ₐₙd ₐccᵤᵣₐₜₑ ₜₑcₕₙᵢqᵤₑ fₒᵣ ₜₕₑ analysis of Rifaximin in the presence of its stress degradation products and analysis of degradation products by LC-MS/MS analysis. Rifaximin was submitted to forced degradation ...

    Abstract Tₕₑ ₚᵣₑₛₑₙₜ ᵣₑₛₑₐᵣcₕ ₐᵢₘₛ ₜₒ ₚᵣₒₚₒₛₑ ₐ ₛᵢₘₚₗₑ ₐₙd ₐccᵤᵣₐₜₑ ₜₑcₕₙᵢqᵤₑ fₒᵣ ₜₕₑ analysis of Rifaximin in the presence of its stress degradation products and analysis of degradation products by LC-MS/MS analysis. Rifaximin was submitted to forced degradation under acid hydrolysis condition as prescribed by the ICH.The active Rifaximin was complementary provided by Hilton Pharma Pvt Ltd, and the extract was prepared by firstly treated with HCl and heated about 4 to 8 h. The filtrate was collected and separated using dichloromethane followed by evaporation in rotary evaporator to obtain a solid crude extract which was then stored under refrigeration at - 80 0 C. Liquid chromatography quadrupole time of flight mass spectrometry (LC- QTOF-MS/MS) was utilized to identify products in the drug sample. The data processing results revealed the presence of 9 products in the degraded sample of Rifaximin. This data article contains the m/z [M + H +] values, molecular formula, retention times and the comprehensive list of m/z values detected during the LC- QTOF- MS/MS analysis.
    Keywords acid hydrolysis ; antibiotics ; evaporation ; filtrates ; liquid chromatography ; methylene chloride ; refrigeration
    Language English
    Dates of publication 2022-0517
    Publishing place Elsevier B.V.
    Document type Article
    Note Pre-press version
    ZDB-ID 2830212-6
    ISSN 2215-0161
    ISSN 2215-0161
    DOI 10.1016/j.mex.2022.101735
    Database NAL-Catalogue (AGRICOLA)

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  3. Article: The LC-QTOF-MS/MS analysis of acid degradation products of Rifaximin, an antibiotic.

    Yaseen, Saima Baig / Akram, Arfa / Musharraf, Syed Ghulam / Wajidi, Mehwish / Tabassum, Nargis / Nazir, Nemat / Shah, Syed Muhammad Zaki

    MethodsX

    2022  Volume 9, Page(s) 101735

    Abstract: The present research aims to propose a simple and accurate technique for the analysis of Rifaximin in the presence of its stress degradation products and analysis of degradation products by LC-MS/MS analysis. Rifaximin was submitted to forced degradation ...

    Abstract The present research aims to propose a simple and accurate technique for the analysis of Rifaximin in the presence of its stress degradation products and analysis of degradation products by LC-MS/MS analysis. Rifaximin was submitted to forced degradation under the acid hydrolysis condition as prescribed by the ICH. The extract was prepared by firstly treated with HCl and heated about 4 to 8 h. The filtrate was collected and separated using dichloromethane followed by evaporation in rotary evaporator to obtain a solid crude extract which was then stored under refrigeration at -80 °C. Liquid chromatography quadrupole time-of-flight mass spectrometry (LC-QTOF-MS/MS) was utilized to identify products in the drug sample. The data processing results revealed the presence of 9 products in the degraded sample of Rifaximin. This data article contains the
    Language English
    Publishing date 2022-05-23
    Publishing country Netherlands
    Document type Journal Article
    ZDB-ID 2830212-6
    ISSN 2215-0161
    ISSN 2215-0161
    DOI 10.1016/j.mex.2022.101735
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  4. Article ; Online: Investigation of α-conotoxin unbinding using umbrella sampling.

    Yu, Rilei / Tabassum, Nargis / Jiang, Tao

    Bioorganic & medicinal chemistry letters

    2016  Volume 26, Issue 4, Page(s) 1296–1300

    Abstract: α-Conotoxins, a class of short and disulfide rich peptide toxins, specifically and potently block nicotinic acetylcholine receptors (nAChRs). In this study umbrella sampling was performed to study the unbinding pathways and potential of mean force (PMF) ... ...

    Abstract α-Conotoxins, a class of short and disulfide rich peptide toxins, specifically and potently block nicotinic acetylcholine receptors (nAChRs). In this study umbrella sampling was performed to study the unbinding pathways and potential of mean force (PMF) of α-conotoxin ImI and PNIA(A10L,D14K). Our results suggest that (i) the unbinding pathways of ImI and PNIA(A10L,D14K) are similar despite of their different disulfide framework and structure, and (ii) α-conotoxin unbinding requires large conformation perturbation of the C-loop and the backbone flexibility of the C-loop can affect the binding or unbinding kinetics of the α-conotoxins. In addition, (iii) umbrella sampling gave correct ranking of the binding affinities of ImI and PNIA(A10L,D14K) indicating its efficacy on prediction of the binding affinities of α-conotoxins and implicating its potential application in design of more potent α-conotoxin analogs.
    MeSH term(s) Binding Sites ; Conotoxins/chemistry ; Conotoxins/metabolism ; Molecular Dynamics Simulation ; Protein Binding ; Protein Structure, Tertiary ; Receptors, Nicotinic/chemistry ; Receptors, Nicotinic/metabolism
    Chemical Substances Conotoxins ; Receptors, Nicotinic ; alpha-conotoxin ImI (156467-85-5)
    Language English
    Publishing date 2016-02-15
    Publishing country England
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 1063195-1
    ISSN 1464-3405 ; 0960-894X
    ISSN (online) 1464-3405
    ISSN 0960-894X
    DOI 10.1016/j.bmcl.2016.01.013
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  5. Article ; Online: Exploring the binding energy profiles of full agonists, partial agonists, and antagonists of the α7 nicotinic acetylcholine receptor.

    Tabassum, Nargis / Ma, Qianyun / Wu, Guanzhao / Jiang, Tao / Yu, Rilei

    Journal of molecular modeling

    2017  Volume 23, Issue 9, Page(s) 251

    Abstract: Nicotinic acetylcholine receptors (nAChRs) belong to the Cys-loop receptor family and are important drug targets for the treatment of neurological diseases. However, the precise determinants of the binding efficacies of ligands for these receptors are ... ...

    Abstract Nicotinic acetylcholine receptors (nAChRs) belong to the Cys-loop receptor family and are important drug targets for the treatment of neurological diseases. However, the precise determinants of the binding efficacies of ligands for these receptors are unclear. Therefore, in this study, the binding energy profiles of various ligands (full agonists, partial agonists, and antagonists) were quantified by docking those ligands with structural ensembles of the α7 nAChR exhibiting different degrees of C-loop closure. This approximate treatment of interactions suggested that full agonists, partial agonists, and antagonists of the α7 nAChR possess distinctive binding energy profiles. Results from docking revealed that ligand binding efficacy may be related to the capacity of the ligand to stabilize conformational states with a closed C loop.
    MeSH term(s) Anabasine/analogs & derivatives ; Anabasine/pharmacology ; Benzylidene Compounds/pharmacology ; Binding Sites ; Bridged Bicyclo Compounds, Heterocyclic/pharmacology ; Humans ; Indoles/pharmacology ; Ligands ; Lobeline/pharmacology ; Molecular Docking Simulation ; Nicotinic Agonists/pharmacology ; Nicotinic Antagonists/pharmacology ; Protein Binding ; Pyridines/pharmacology ; Strychnine/pharmacology ; Tubocurarine/pharmacology ; alpha7 Nicotinic Acetylcholine Receptor/agonists ; alpha7 Nicotinic Acetylcholine Receptor/antagonists & inhibitors ; alpha7 Nicotinic Acetylcholine Receptor/metabolism
    Chemical Substances Benzylidene Compounds ; Bridged Bicyclo Compounds, Heterocyclic ; Indoles ; Ligands ; Nicotinic Agonists ; Nicotinic Antagonists ; Pyridines ; alpha7 Nicotinic Acetylcholine Receptor ; tropisetron (6I819NIK1W) ; 3-(2,4-dimethoxybenzylidene)anabaseine (8S399XDN2K) ; Lobeline (D0P25S3P81) ; anabaseine (DYE103K23I) ; Strychnine (H9Y79VD43J) ; Anabasine (LMS11II2LO) ; epibatidine (M6K314F1XX) ; Tubocurarine (W9YXS298BM)
    Language English
    Publishing date 2017-08-02
    Publishing country Germany
    Document type Journal Article
    ZDB-ID 1284729-x
    ISSN 0948-5023 ; 1610-2940
    ISSN (online) 0948-5023
    ISSN 1610-2940
    DOI 10.1007/s00894-017-3419-4
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  6. Article ; Online: Molecular Determinants Conferring the Stoichiometric-Dependent Activity of α-Conotoxins at the Human α9α10 Nicotinic Acetylcholine Receptor Subtype.

    Yu, Rilei / Tae, Han-Shen / Tabassum, Nargis / Shi, Juan / Jiang, Tao / Adams, David J

    Journal of medicinal chemistry

    2018  Volume 61, Issue 10, Page(s) 4628–4634

    Abstract: α9α10 nicotinic acetylcholine receptors (nAChRs) putatively exist at different stoichiometries. We systematically investigated the molecular determinants of α-conotoxins Vc1.1, RgIA#, and PeIA inhibition at hypothetical stoichiometries of the human α9α10 ...

    Abstract α9α10 nicotinic acetylcholine receptors (nAChRs) putatively exist at different stoichiometries. We systematically investigated the molecular determinants of α-conotoxins Vc1.1, RgIA#, and PeIA inhibition at hypothetical stoichiometries of the human α9α10 nAChR. Our results suggest that only Vc1.1 exhibits stoichiometric-dependent inhibition at the α9α10 nAChR. The hydrogen bond between N154 of α9 and D11 of Vc1.1 at the α9(+)-α9(-) interface is responsible for the stoichiometric-dependent potency of Vc1.1.
    MeSH term(s) Animals ; Conotoxins/chemistry ; Conotoxins/pharmacology ; Humans ; Models, Molecular ; Molecular Dynamics Simulation ; Molecular Structure ; Nicotinic Antagonists/chemistry ; Nicotinic Antagonists/pharmacology ; Oocytes/cytology ; Oocytes/drug effects ; Oocytes/metabolism ; Protein Conformation ; Protein Subunits ; Receptors, Nicotinic/chemistry ; Receptors, Nicotinic/classification ; Receptors, Nicotinic/metabolism ; Xenopus laevis
    Chemical Substances Conotoxins ; Nicotinic Antagonists ; Protein Subunits ; Receptors, Nicotinic ; alpha-conotoxin Vc1.1 (5U5J1KR8NU)
    Language English
    Publishing date 2018-05-15
    Publishing country United States
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 218133-2
    ISSN 1520-4804 ; 0022-2623
    ISSN (online) 1520-4804
    ISSN 0022-2623
    DOI 10.1021/acs.jmedchem.8b00115
    Database MEDical Literature Analysis and Retrieval System OnLINE

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    Zs.MB 1: Show issues

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  7. Article: Role of Cys

    Tabassum, Nargis / Tae, Han-Shen / Jia, Xinying / Kaas, Quentin / Jiang, Tao / Adams, David J / Yu, Rilei

    ACS omega

    2017  Volume 2, Issue 8, Page(s) 4621–4631

    Abstract: α-Conotoxins preferentially antagonize muscle and neuronal nicotinic acetylcholine receptors (nAChRs). Native α-conotoxins have two disulfide links, ... ...

    Abstract α-Conotoxins preferentially antagonize muscle and neuronal nicotinic acetylcholine receptors (nAChRs). Native α-conotoxins have two disulfide links, C
    Language English
    Publishing date 2017-08-17
    Publishing country United States
    Document type Journal Article
    ISSN 2470-1343
    ISSN 2470-1343
    DOI 10.1021/acsomega.7b00639
    Database MEDical Literature Analysis and Retrieval System OnLINE

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