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  1. Article ; Online: The Landscape of Potential Small and Drug Substance Related Nitrosamines in Pharmaceuticals.

    Schlingemann, Joerg / Burns, Michael J / Ponting, David J / Martins Avila, Carolina / Romero, Naiffer E / Jaywant, Mrunal A / Smith, Graham F / Ashworth, Ian W / Simon, Stephanie / Saal, Christoph / Wilk, Andrzej

    Journal of pharmaceutical sciences

    2022  Volume 112, Issue 5, Page(s) 1287–1304

    Abstract: This article reports the outcome of an in silico analysis of more than 12,000 small molecule drugs and drug impurities, identifying the nitrosatable structures, assessing their potential to form nitrosamines under relevant conditions and the challenges ... ...

    Abstract This article reports the outcome of an in silico analysis of more than 12,000 small molecule drugs and drug impurities, identifying the nitrosatable structures, assessing their potential to form nitrosamines under relevant conditions and the challenges to determine compound-specific AIs based on data available or read-across approaches for these nitrosamines and their acceptance by health authorities. Our data indicate that the presence of nitrosamines in pharmaceuticals is likely more prevalent than originally expected. In total, 40.4 % of the analyzed APIs and 29.6 % of the API impurities are potential nitrosamine precursors. Most structures identified through our workflow could form complex API-related nitrosamines, so-called nitrosamine drug substance related impurities (NDSRIs), although we also found structures that could release the well-known small and potent nitrosamines NDMA, NDEA, and others. Due to common structural motifs including secondary or tertiary amine moieties, whole essential drug classes such as beta blockers and ACE inhibitors are at risk. To avoid the risk of drug shortages or even the complete loss of therapeutic options, it will be essential that the well-established ICH M7 principles remain applicable for nitrosamines and that that the industry and regulatory authorities keep an open communication not only about the science but also to make sure there is a good balance between risk and benefit to patients.
    MeSH term(s) Humans ; Nitrosamines/chemistry ; Amines/chemistry ; Pharmaceutical Preparations
    Chemical Substances Nitrosamines ; Amines ; Pharmaceutical Preparations
    Language English
    Publishing date 2022-11-17
    Publishing country United States
    Document type Journal Article
    ZDB-ID 3151-3
    ISSN 1520-6017 ; 0022-3549
    ISSN (online) 1520-6017
    ISSN 0022-3549
    DOI 10.1016/j.xphs.2022.11.013
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  2. Article ; Online: (-)-Tarchonanthuslactone: Design of New Analogues, Evaluation of their Antiproliferative Activity on Cancer Cell Lines, and Preliminary Mechanistic Studies.

    Toneto Novaes, Luiz Fernando / Martins Avila, Carolina / Pelizzaro-Rocha, Karin Juliane / Vendramini-Costa, Débora Barbosa / Pereira Dias, Marina / Barbosa Trivella, Daniela Barreto / Ernesto de Carvalho, João / Ferreira-Halder, Carmen Veríssima / Pilli, Ronaldo Aloise

    ChemMedChem

    2015  Volume 10, Issue 10, Page(s) 1687–1699

    Abstract: Natural products containing the α,β-unsaturated δ-lactone skeleton have been shown to possess a variety of biological activities. The natural product (-)-tarchonanthuslactone (1) possessing this privileged scaffold is a popular synthetic target, but its ... ...

    Abstract Natural products containing the α,β-unsaturated δ-lactone skeleton have been shown to possess a variety of biological activities. The natural product (-)-tarchonanthuslactone (1) possessing this privileged scaffold is a popular synthetic target, but its biological activity remains underexplored. Herein, the total syntheses of dihydropyran-2-ones modeled on the structure of 1 were undertaken. These compounds were obtained in overall yields of 17-21 % based on the Keck asymmetric allylation reaction and were evaluated in vitro against eight different cultured human tumor cell lines. We further conducted initial investigation into the mechanism of action of selected analogues. Dihydropyran-2-one 8 [(S,E)-(6-oxo-3,6-dihydro-2H-pyran-2-yl)methyl 3-(3,4-dihydroxyphenyl)acrylate], a simplified analogue of (-)-tarchonanthuslactone (1) bearing an additional electrophilic site and a catechol system, was the most cytotoxic and selective compound against six of the eight cancer cell lines analyzed, including the pancreatic cancer cell line. Preliminary studies on the mechanism of action of compound 8 on pancreatic cancer demonstrated that apoptotic cell death takes place mediated by an increase in the level of reactive oxygen species. It appears as though compound 8, possessing two Michael acceptors and a catechol system, may be a promising scaffold for the selective killing of cancer cells, and thus, it deserves further investigation to determine its potential for cancer therapy.
    MeSH term(s) Antineoplastic Agents, Phytogenic/chemical synthesis ; Antineoplastic Agents, Phytogenic/chemistry ; Antineoplastic Agents, Phytogenic/pharmacology ; Biological Products/chemical synthesis ; Biological Products/chemistry ; Biological Products/pharmacology ; Cell Proliferation/drug effects ; Dose-Response Relationship, Drug ; Drug Design ; Drug Screening Assays, Antitumor ; Humans ; Molecular Structure ; Pyrones/chemical synthesis ; Pyrones/chemistry ; Pyrones/pharmacology ; Stereoisomerism ; Structure-Activity Relationship ; Tumor Cells, Cultured
    Chemical Substances Antineoplastic Agents, Phytogenic ; Biological Products ; Pyrones ; tarchonanthuslactone
    Language English
    Publishing date 2015-10
    Publishing country Germany
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 2218496-X
    ISSN 1860-7187 ; 1860-7179
    ISSN (online) 1860-7187
    ISSN 1860-7179
    DOI 10.1002/cmdc.201500246
    Database MEDical Literature Analysis and Retrieval System OnLINE

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