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  1. Article ; Online: Synthesis and Photophysical Characterization of a pH-Sensitive Quadracyclic Uridine (qU) Analogue.

    Le, Hoang-Ngoan / Kuchlyan, Jagannath / Baladi, Tom / Albinsson, Bo / Dahlén, Anders / Wilhelmsson, L Marcus

    Chemistry (Weinheim an der Bergstrasse, Germany)

    2024  Volume 30, Issue 18, Page(s) e202303539

    Abstract: Fluorescent base analogues (FBAs) have become useful tools for applications in biophysical chemistry, chemical biology, live-cell imaging, and RNA therapeutics. Herein, two synthetic routes towards a novel FBA of uracil named qU (quadracyclic uracil/ ... ...

    Abstract Fluorescent base analogues (FBAs) have become useful tools for applications in biophysical chemistry, chemical biology, live-cell imaging, and RNA therapeutics. Herein, two synthetic routes towards a novel FBA of uracil named qU (quadracyclic uracil/uridine) are described. The qU nucleobase bears a tetracyclic fused ring system and is designed to allow for specific Watson-Crick base pairing with adenine. We find that qU absorbs light in the visible region of the spectrum and emits brightly with a quantum yield of 27 % and a dual-band character in a wide pH range. With evidence, among other things, from fluorescence lifetime measurements we suggest that this dual emission feature results from an excited-state proton transfer (ESPT) process. Furthermore, we find that both absorption and emission of qU are highly sensitive to pH. The high brightness in combination with excitation in the visible and pH responsiveness makes qU an interesting native-like nucleic acid label in spectroscopy and microscopy applications in, for example, the field of mRNA and antisense oligonucleotide (ASO) therapeutics.
    MeSH term(s) Uridine/chemistry ; Fluorescent Dyes/chemistry ; Nucleic Acids ; Hydrogen-Ion Concentration ; Uracil
    Chemical Substances Uridine (WHI7HQ7H85) ; Fluorescent Dyes ; Nucleic Acids ; Uracil (56HH86ZVCT)
    Language English
    Publishing date 2024-02-09
    Publishing country Germany
    Document type Journal Article
    ZDB-ID 1478547-X
    ISSN 1521-3765 ; 0947-6539
    ISSN (online) 1521-3765
    ISSN 0947-6539
    DOI 10.1002/chem.202303539
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  2. Article ; Online: Multiphoton characterization and live cell imaging using fluorescent adenine analogue 2CNqA.

    Nilsson, Jesper R / Benitez-Martin, Carlos / Sansom, Henry G / Pfeiffer, Pauline / Baladi, Tom / Le, Hoang-Ngoan / Dahlén, Anders / Magennis, Steven W / Wilhelmsson, L Marcus

    Physical chemistry chemical physics : PCCP

    2023  Volume 25, Issue 30, Page(s) 20218–20224

    Abstract: Fluorescent nucleobase analogues (FBAs) are established tools for studying oligonucleotide structure, dynamics and interactions, and have recently also emerged as an attractive option for labeling RNA-based therapeutics. A recognized drawback of FBAs, ... ...

    Abstract Fluorescent nucleobase analogues (FBAs) are established tools for studying oligonucleotide structure, dynamics and interactions, and have recently also emerged as an attractive option for labeling RNA-based therapeutics. A recognized drawback of FBAs, however, is that they typically require excitation in the UV region, which for imaging in biological samples may have disadvantages related to phototoxicity, tissue penetration, and out-of-focus photobleaching. Multiphoton excitation has the potential to alleviate these issues and therefore, in this work, we characterize the multiphoton absorption properties and detectability of the highly fluorescent quadracyclic adenine analogue 2CNqA as a ribonucleotide monomer as well as incorporated, at one or two positions, into a 16mer antisense oligonucleotide (ASO). We found that 2CNqA has a two-photon absorption cross section that, among FBAs, is exceptionally high, with values of
    MeSH term(s) Fluorescent Dyes/chemistry ; Oligonucleotides ; Spectrometry, Fluorescence/methods ; Purine Nucleosides ; Adenine/chemistry
    Chemical Substances Fluorescent Dyes ; Oligonucleotides ; Purine Nucleosides ; Adenine (JAC85A2161)
    Language English
    Publishing date 2023-08-02
    Publishing country England
    Document type Journal Article
    ZDB-ID 1476244-4
    ISSN 1463-9084 ; 1463-9076
    ISSN (online) 1463-9084
    ISSN 1463-9076
    DOI 10.1039/d3cp01147j
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  3. Article ; Online: Sulfonylguanidine Derivatives as Potential Antimelanoma Agents.

    Baladi, Tom / Hamouda-Tekaya, Nedra / Gonçalves, Leticia Christina Pires / Rocchi, Stéphane / Ronco, Cyril / Benhida, Rachid

    ChemMedChem

    2020  Volume 15, Issue 13, Page(s) 1113–1117

    Abstract: Sulfonylguanidines are interesting bioactive compounds with a broad range of applications in the treatment of different pathologies. 2-Aminobenzazole-based structures are well employed in the development of new anticancer drugs. Two series of novel N- ... ...

    Abstract Sulfonylguanidines are interesting bioactive compounds with a broad range of applications in the treatment of different pathologies. 2-Aminobenzazole-based structures are well employed in the development of new anticancer drugs. Two series of novel N-benzazol-2-yl-N'-sulfonyl guanidine derivatives were synthesized with the sulfonylguanidine in either an extra- or intracyclic frame. They were evaluated for their antiproliferative activity against malignant melanoma tumor cells, thus allowing structure-activity relationships to be defined. Additionally, NCI-60 screening was performed for the best analogue to study its efficiency against a panel of other cancer cell lines. The stability profile of this promising compound was then validated. During the synthetic process, an unexpected new deamidination of the sulfonylguanidine towards sulfonamide function was also identified.
    MeSH term(s) Antineoplastic Agents/chemical synthesis ; Antineoplastic Agents/chemistry ; Antineoplastic Agents/pharmacology ; Cell Line, Tumor ; Cell Proliferation/drug effects ; Cell Survival/drug effects ; Dose-Response Relationship, Drug ; Drug Screening Assays, Antitumor ; Guanidine/analogs & derivatives ; Guanidine/chemical synthesis ; Guanidine/chemistry ; Guanidine/pharmacology ; Humans ; Hydrogen-Ion Concentration ; Melanoma/drug therapy ; Melanoma/pathology ; Molecular Docking Simulation ; Molecular Structure ; Skin Neoplasms/drug therapy ; Skin Neoplasms/pathology ; Structure-Activity Relationship
    Chemical Substances Antineoplastic Agents ; sulfonylguanidine ; Guanidine (JU58VJ6Y3B)
    Language English
    Publishing date 2020-05-12
    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.202000218
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  4. Article ; Online: Fluorescent base analogues in gapmers enable stealth labeling of antisense oligonucleotide therapeutics.

    Nilsson, Jesper R / Baladi, Tom / Gallud, Audrey / Baždarević, Dženita / Lemurell, Malin / Esbjörner, Elin K / Wilhelmsson, L Marcus / Dahlén, Anders

    Scientific reports

    2021  Volume 11, Issue 1, Page(s) 11365

    Abstract: To expand the antisense oligonucleotide (ASO) fluorescence labeling toolbox beyond covalent conjugation of external dyes (e.g. ATTO-, Alexa Fluor-, or cyanine dyes), we herein explore fluorescent base analogues (FBAs) as a novel approach to endow ... ...

    Abstract To expand the antisense oligonucleotide (ASO) fluorescence labeling toolbox beyond covalent conjugation of external dyes (e.g. ATTO-, Alexa Fluor-, or cyanine dyes), we herein explore fluorescent base analogues (FBAs) as a novel approach to endow fluorescent properties to ASOs. Both cytosine and adenine analogues (tC, tC
    MeSH term(s) Cell Survival/drug effects ; Flow Cytometry ; Fluorescent Dyes/chemistry ; HEK293 Cells ; Humans ; Microscopy, Fluorescence ; Nucleic Acid Conformation ; Oligonucleotides, Antisense/chemistry ; Oligonucleotides, Antisense/pharmacology ; Real-Time Polymerase Chain Reaction ; Reverse Transcription ; Spectrophotometry, Ultraviolet
    Chemical Substances Fluorescent Dyes ; Oligonucleotides, Antisense
    Language English
    Publishing date 2021-05-31
    Publishing country England
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 2615211-3
    ISSN 2045-2322 ; 2045-2322
    ISSN (online) 2045-2322
    ISSN 2045-2322
    DOI 10.1038/s41598-021-90629-1
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  5. Article ; Online: Direct Alkynylation of 3H-Imidazo[4,5-b]pyridines Using gem-Dibromoalkenes as Alkynes Source.

    Aziz, Jessy / Baladi, Tom / Piguel, Sandrine

    The Journal of organic chemistry

    2016  Volume 81, Issue 10, Page(s) 4122–4133

    Abstract: C2 direct alkynylation of 3H-imidazo[4,5-b]pyridine derivatives is explored for the first time. Stable and readily available 1,1-dibromo-1-alkenes, electrophilic alkyne precursors, are used as coupling partners. The simple reaction conditions include an ... ...

    Abstract C2 direct alkynylation of 3H-imidazo[4,5-b]pyridine derivatives is explored for the first time. Stable and readily available 1,1-dibromo-1-alkenes, electrophilic alkyne precursors, are used as coupling partners. The simple reaction conditions include an inexpensive copper catalyst (CuBr·SMe2 or Cu(OAc)2), a phosphine ligand (DPEphos) and a base (LiOtBu) in 1,4-dioxane at 120 °C. This C-H alkynylation method revealed to be compatible with a variety of substitutions on both coupling partners: heteroarenes and gem-dibromoalkenes. This protocol allows the straightforward synthesis of various 2-alkynyl-3H-imidazo[4,5-b]pyridines, a valuable scaffold in drug design.
    Language English
    Publishing date 2016-05-20
    Publishing country United States
    Document type Journal Article
    ZDB-ID 123490-0
    ISSN 1520-6904 ; 0022-3263
    ISSN (online) 1520-6904
    ISSN 0022-3263
    DOI 10.1021/acs.joc.6b00406
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  6. Article ; Online: State-of-the-art of small molecule inhibitors of the TAM family: the point of view of the chemist.

    Baladi, Tom / Abet, Valentina / Piguel, Sandrine

    European journal of medicinal chemistry

    2015  Volume 105, Page(s) 220–237

    Abstract: The TAM family of tyrosine kinases receptors (Tyro3, Axl and Mer) is implicated in cancer development, autoimmune reactions and viral infection and is therefore emerging as an effective and attractive therapeutic target. To date, only a few small ... ...

    Abstract The TAM family of tyrosine kinases receptors (Tyro3, Axl and Mer) is implicated in cancer development, autoimmune reactions and viral infection and is therefore emerging as an effective and attractive therapeutic target. To date, only a few small molecules have been intentionally designed to block the TAM kinases, while most of the inhibitors were developed for blocking different protein kinases and then identified through selectivity profile studies. This minireview will examine in terms of chemical structure the different compounds able to act on either one, two or three TAM kinases with details about structure-activity relationships, drug-metabolism and pharmacokinetics properties where they exist.
    MeSH term(s) Animals ; Dose-Response Relationship, Drug ; Humans ; Models, Molecular ; Molecular Structure ; Protein Kinase Inhibitors/chemical synthesis ; Protein Kinase Inhibitors/chemistry ; Protein Kinase Inhibitors/pharmacology ; Receptor Protein-Tyrosine Kinases/antagonists & inhibitors ; Receptor Protein-Tyrosine Kinases/metabolism ; Small Molecule Libraries/chemical synthesis ; Small Molecule Libraries/chemistry ; Small Molecule Libraries/pharmacology ; Structure-Activity Relationship
    Chemical Substances Protein Kinase Inhibitors ; Small Molecule Libraries ; Receptor Protein-Tyrosine Kinases (EC 2.7.10.1)
    Language English
    Publishing date 2015-11-13
    Publishing country France
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 188597-2
    ISSN 1768-3254 ; 0009-4374 ; 0223-5234
    ISSN (online) 1768-3254
    ISSN 0009-4374 ; 0223-5234
    DOI 10.1016/j.ejmech.2015.10.003
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  7. Article ; Online: Fluorescent base analogues in gapmers enable stealth labeling of antisense oligonucleotide therapeutics

    Jesper R. Nilsson / Tom Baladi / Audrey Gallud / Dženita Baždarević / Malin Lemurell / Elin K. Esbjörner / L. Marcus Wilhelmsson / Anders Dahlén

    Scientific Reports, Vol 11, Iss 1, Pp 1-

    2021  Volume 13

    Abstract: Abstract To expand the antisense oligonucleotide (ASO) fluorescence labeling toolbox beyond covalent conjugation of external dyes (e.g. ATTO-, Alexa Fluor-, or cyanine dyes), we herein explore fluorescent base analogues (FBAs) as a novel approach to ... ...

    Abstract Abstract To expand the antisense oligonucleotide (ASO) fluorescence labeling toolbox beyond covalent conjugation of external dyes (e.g. ATTO-, Alexa Fluor-, or cyanine dyes), we herein explore fluorescent base analogues (FBAs) as a novel approach to endow fluorescent properties to ASOs. Both cytosine and adenine analogues (tC, tCO, 2CNqA, and pA) were incorporated into a 16mer ASO sequence with a 3-10-3 cEt-DNA-cEt (cEt = constrained ethyl) gapmer design. In addition to a comprehensive photophysical characterization, we assess the label-induced effects on the gapmers’ RNA affinities, RNA-hybridized secondary structures, and knockdown efficiencies. Importantly, we find practically no perturbing effects for gapmers with single FBA incorporations in the biologically critical gap region and, except for pA, the FBAs do not affect the knockdown efficiencies. Incorporating two cytosine FBAs in the gap is equally well tolerated, while two adenine analogues give rise to slightly reduced knockdown efficiencies and what could be perturbed secondary structures. We furthermore show that the FBAs can be used to visualize gapmers inside live cells using fluorescence microscopy and flow cytometry, enabling comparative assessment of their uptake. This altogether shows that FBAs are functional ASO probes that provide a minimally perturbing in-sequence labeling option for this highly relevant drug modality.
    Keywords Medicine ; R ; Science ; Q
    Language English
    Publishing date 2021-05-01T00:00:00Z
    Publisher Nature Portfolio
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  8. Article ; Online: Stealth Fluorescence Labeling for Live Microscopy Imaging of mRNA Delivery.

    Baladi, Tom / Nilsson, Jesper R / Gallud, Audrey / Celauro, Emanuele / Gasse, Cécile / Levi-Acobas, Fabienne / Sarac, Ivo / Hollenstein, Marcel R / Dahlén, Anders / Esbjörner, Elin K / Wilhelmsson, L Marcus

    Journal of the American Chemical Society

    2021  Volume 143, Issue 14, Page(s) 5413–5424

    Abstract: Methods for tracking RNA inside living cells without perturbing their natural interactions and functions are critical within biology and, in particular, to facilitate studies of therapeutic RNA delivery. We present a stealth labeling approach that can ... ...

    Abstract Methods for tracking RNA inside living cells without perturbing their natural interactions and functions are critical within biology and, in particular, to facilitate studies of therapeutic RNA delivery. We present a stealth labeling approach that can efficiently, and with high fidelity, generate RNA transcripts, through enzymatic incorporation of the triphosphate of tC
    MeSH term(s) COVID-19/drug therapy ; Cell Line, Tumor ; Cytosine/analogs & derivatives ; Cytosine/analysis ; Cytosine/chemical synthesis ; Cytosine/chemistry ; Fluorescence ; Fluorescent Dyes/analysis ; Fluorescent Dyes/chemical synthesis ; Fluorescent Dyes/chemistry ; Green Fluorescent Proteins/metabolism ; Histones/metabolism ; Humans ; Molecular Imaging ; Molecular Structure ; RNA, Messenger/analysis ; RNA, Messenger/chemistry ; RNA, Messenger/metabolism ; RNA, Messenger/therapeutic use ; Spectrometry, Fluorescence
    Chemical Substances Fluorescent Dyes ; Histones ; RNA, Messenger ; Green Fluorescent Proteins (147336-22-9) ; Cytosine (8J337D1HZY)
    Language English
    Publishing date 2021-04-02
    Publishing country United States
    Document type Journal Article
    ZDB-ID 3155-0
    ISSN 1520-5126 ; 0002-7863
    ISSN (online) 1520-5126
    ISSN 0002-7863
    DOI 10.1021/jacs.1c00014
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  9. Article: Direct Alkynylation of 3H-Imidazo[4,5-b]pyridines Using gem-Dibromoalkenes as Alkynes Source

    Aziz, Jessy / Baladi Tom / Piguel Sandrine

    Journal of organic chemistry. 2016 May 20, v. 81, no. 10

    2016  

    Abstract: C2 direct alkynylation of 3H-imidazo[4,5-b]pyridine derivatives is explored for the first time. Stable and readily available 1,1-dibromo-1-alkenes, electrophilic alkyne precursors, are used as coupling partners. The simple reaction conditions include an ... ...

    Abstract C2 direct alkynylation of 3H-imidazo[4,5-b]pyridine derivatives is explored for the first time. Stable and readily available 1,1-dibromo-1-alkenes, electrophilic alkyne precursors, are used as coupling partners. The simple reaction conditions include an inexpensive copper catalyst (CuBr·SMe₂ or Cu(OAc)₂), a phosphine ligand (DPEphos) and a base (LiOtBu) in 1,4-dioxane at 120 °C. This C–H alkynylation method revealed to be compatible with a variety of substitutions on both coupling partners: heteroarenes and gem-dibromoalkenes. This protocol allows the straightforward synthesis of various 2-alkynyl-3H-imidazo[4,5-b]pyridines, a valuable scaffold in drug design.
    Keywords acetates ; alkynes ; catalysts ; chemical reactions ; chemical structure ; copper ; drugs ; Lewis acids ; ligands ; organic chemistry ; phosphine ; pyridines
    Language English
    Dates of publication 2016-0520
    Size p. 4122-4133.
    Publishing place American Chemical Society
    Document type Article
    ZDB-ID 123490-0
    ISSN 1520-6904 ; 0022-3263
    ISSN (online) 1520-6904
    ISSN 0022-3263
    DOI 10.1021%2Facs.joc.6b00406
    Database NAL-Catalogue (AGRICOLA)

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  10. Article ; Online: Design, synthesis, biological evaluation and cellular imaging of imidazo[4,5-b]pyridine derivatives as potent and selective TAM inhibitors.

    Baladi, Tom / Aziz, Jessy / Dufour, Florent / Abet, Valentina / Stoven, Véronique / Radvanyi, François / Poyer, Florent / Wu, Ting-Di / Guerquin-Kern, Jean-Luc / Bernard-Pierrot, Isabelle / Garrido, Sergio Marco / Piguel, Sandrine

    Bioorganic & medicinal chemistry

    2018  Volume 26, Issue 20, Page(s) 5510–5530

    Abstract: The TAM kinase family arises as a new effective and attractive therapeutic target for cancer therapy, autoimmune and viral diseases. A series of 2,6-disubstituted imidazo[4,5-b]pyridines were designed, synthesized and identified as highly potent TAM ... ...

    Abstract The TAM kinase family arises as a new effective and attractive therapeutic target for cancer therapy, autoimmune and viral diseases. A series of 2,6-disubstituted imidazo[4,5-b]pyridines were designed, synthesized and identified as highly potent TAM inhibitors. Despite remarkable structural similarities within the TAM family, compounds 28 and 25 demonstrated high activity and selectivity in vitro against AXL and MER, with IC
    MeSH term(s) A549 Cells ; Drug Design ; Humans ; Imidazoles/chemical synthesis ; Imidazoles/chemistry ; Imidazoles/pharmacokinetics ; Imidazoles/pharmacology ; Models, Molecular ; Protein Kinase Inhibitors/chemical synthesis ; Protein Kinase Inhibitors/chemistry ; Protein Kinase Inhibitors/pharmacokinetics ; Protein Kinase Inhibitors/pharmacology ; Proto-Oncogene Proteins/antagonists & inhibitors ; Proto-Oncogene Proteins/metabolism ; Pyridines/chemical synthesis ; Pyridines/chemistry ; Pyridines/pharmacokinetics ; Pyridines/pharmacology ; Receptor Protein-Tyrosine Kinases/antagonists & inhibitors ; Receptor Protein-Tyrosine Kinases/metabolism ; Structure-Activity Relationship ; c-Mer Tyrosine Kinase/antagonists & inhibitors ; c-Mer Tyrosine Kinase/metabolism
    Chemical Substances Imidazoles ; Protein Kinase Inhibitors ; Proto-Oncogene Proteins ; Pyridines ; imidazopyridine ; MERTK protein, human (EC 2.7.10.1) ; Receptor Protein-Tyrosine Kinases (EC 2.7.10.1) ; TYRO3 protein, human (EC 2.7.10.1) ; axl receptor tyrosine kinase (EC 2.7.10.1) ; c-Mer Tyrosine Kinase (EC 2.7.10.1)
    Language English
    Publishing date 2018-09-25
    Publishing country England
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 1161284-8
    ISSN 1464-3391 ; 0968-0896
    ISSN (online) 1464-3391
    ISSN 0968-0896
    DOI 10.1016/j.bmc.2018.09.031
    Database MEDical Literature Analysis and Retrieval System OnLINE

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