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Synthesis of New Polyfluoro Oligonucleotides via Staudinger Reaction.
Int J Mol Sci
December 2024
Department of Physics, Novosibirsk State University, 2 Pirogov Str., Novosibirsk 630090, Russia.
Nowadays, nucleic acid derivatives capable of modulating gene expression at the RNA level have gained widespread recognition as promising therapeutic agents. A suitable degree of biological stability of oligonucleotide therapeutics is required for in vivo application; this can be most expeditiously achieved by the chemical modification of the internucleotidic phosphate group, which may also affect their cellular uptake, tissue distribution and pharmacokinetics. Our group has previously developed a strategy for the chemical modification of the phosphate group via the Staudinger reaction on a solid phase of the intermediate dinucleoside phosphite triester and a range of, preferably, electron deficient organic azides such as sulfonyl azides during automated solid-phase DNA synthesis according to the conventional β-cyanoethyl phosphoramidite scheme.
View Article and Find Full Text PDFStudies of methylated CpG ODN from subsp. in a murine model: Implications for treatment of human allergic disease.
Allergy Asthma Proc
January 2025
From the Department of Microbiology-Immunology, Georgetown University Medical Center, Washington, D.C.
Allergen immunotherapy (AIT) is currently the most effective immunologic form of treatment for patients with atopic allergic diseases commonly used by allergist/immunologists to reduce allergic symptoms by gradually desensitizing the immune system to specific allergens. Currently, the primary mechanism of AIT emphasizes the crucial role of immune regulation, which involves a shift from a T-helper type 2 (Th2) cell response, which promotes allergy, to a T-regulatory (Treg) cell population, which inhibits the allergic inflammatory response through the production of immunosuppressive cytokines interleukin 10 and transforming growth factor β, which play pivotal roles in suppressing the allergic reaction. In a series of previous in vitro and in vivo experiments, we have demonstrated the capacity of synthetic methylated cytosine-phosphate-guanine (CpG) oligodeoxynucleotide (ODN) moieties as well as methylated genomic DNA ODN motifs from Bifidobacterium longum subspecies infantis to activate Treg cell differentiation in contrast to the unmethylated ODN moiety, which promotes proinflammatory responses driven by Th17-mediated responses.
View Article and Find Full Text PDFWTAP, a conserved mA writer, can promote the antiviral immunity of Miichthysmiiuy.
Dev Comp Immunol
January 2025
Laboratory of Fish Molecular Immunology, College of Fisheries and Life Science, Shanghai Ocean University, Shanghai, China; National Pathogen Collection Center for Aquatic Animals, Shanghai Ocean University, China; Key Laboratory of Freshwater Aquatic Genetic Resources, Ministry of Agriculture and Rural Affairs, Shanghai Ocean University, China. Electronic address:
N6-methyladenosine (mA) is one of the most prevalent modifications found in eukaryotic mRNA and has been implicated in the regulation of cell proliferation, development, invasion, apoptosis, and immunity. In this study, we first conducted a structural and evolutionary analysis of Wilms' tumour 1-associating protein (WTAP) in vertebrates, and the results showed that WTAP in vertebrates is conserved particularly in mammals and fish. We subsequently investigated the involvement of WTAP in the antiviral immune response of fish and discovered that the expression of Miichthys miiuy (mmiWTAP) decreased in response to stimulation with Siniperca chuatsi rhabdovirus (SCRV) and poly(I:C).
View Article and Find Full Text PDFDual-mode colorimetric and chemiluminescence aptasensor for organophosphorus pesticides detection using aptamer-regulated peroxidase-like activity of TA-Cu.
Talanta
April 2025
Tianjin Key Laboratory of Industrial Microbiology, College of Biotechnology, Tianjin University of Science and Technology, No. 29 of 13th Street, TEDA, Tianjin, 300457, PR China. Electronic address:
The residues of organophosphorus pesticides (OPs) in food pose a huge threat to human health. Therefore, the development of detection methods with simple design and high sensitivity is urgently needed. Here, a colorimetric/chemiluminescence (CL) dual-mode aptasensor strategy with high selectivity and sensitivity for detecting Parathion-methyl (PM) was designed based on aptamer-regulated nanozyme activity.
View Article and Find Full Text PDFComparison of the mechanisms of DNA damage following photoexcitation and chemiexcitation.
J Photochem Photobiol B
January 2025
Centro de Ciências Naturais e Humanas, Universidade Federal do ABC, Santo André, São Paulo, SP 09210-580, Brazil.
In this review, we compare the mechanisms and consequences of electronic excitation of DNA via photon absorption or photosensitization, as well as by chemically induced generation of excited states. The absorption of UV radiation by DNA is known to produce cyclobutane pyrimidine dimers (CPDs) and thymine pyrimidone photoproducts. Photosensitizers are known to enable such transformations using UV-A and visible light by generating triplet species able to transfer energy to DNA.
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