Luzina I.G.,University of Maryland Baltimore County |
Luzina I.G.,Research Service |
Lockatell V.,University of Maryland Baltimore County |
Lavania S.,University of Maryland Baltimore County |
And 7 more authors.
Cytokine | Year: 2012
We have previously described an alternatively spliced isoform of IL-4 mRNA that omits exon 2 and is termed IL-4δ2. However, the natural production of IL-4δ2 protein and its association with disease have not been previously assessed due to unavailability of an antibody that interacts with IL-4δ2 without cross-reactivity with full length IL-4. We used a unique monoclonal antibody (mAb) that reacts with IL-4δ2, but not with IL-4, and observed that IL-4δ2 is naturally produced by T cells from patients with asthma, but not from healthy controls. The kinetics of IL-4δ2 and IL-4 production by phorbol myristate acetate (PMA)/ionomycin-activated cells differed, with IL-4δ2 increasing at 48-72. h and IL-4 peaking at 24. h. The steady-state levels of IL-4δ2 mRNA varied significantly among the donors and were discordant with the corresponding protein levels, suggesting post-transcriptional regulation of protein production. Polarized Th1 or Th2 lymphocytes were not a major source of IL-4δ2. Stimulation of cultured T lymphocytes with IL-4δ2 caused elevated production of IFN-γ, IL-10, IL-6, MCP-1, and TNF-α, with notable differences between patients and controls in the production of IFN-γ, IL-10, and IL-6. Thus, IL-4δ2 is natively produced not only as mRNA but also as a protein by cells other than Th1 or Th2. It is regulated post-transcriptionally, is associated with allergic asthma, and regulates production of other cytokines by primary T lymphocytes. Alternatively spliced interleukin-4 may be a new biomarker, a pathophysiological player, and possibly a molecular target for future therapies in asthma. © 2011. Source
Andreev S.,NRC Institute of Immunology |
Purgina D.,NRC Institute of Immunology |
Bashkatova E.,NRC Institute of Immunology |
Garshev A.,Moscow State University |
And 5 more authors.
Fullerenes Nanotubes and Carbon Nanostructures | Year: 2015
A simple approach for large-scale production of aqueous dispersions of fullerene C60 (nC60) with good stability was developed by mixing a solution of crystalline fullerene in N-methylpyrrolidone (NMP) with water followed by exhaustive dialysis against water. Addition of amino acids or sugars at low concentration before dialysis increases the stability of the dispersion. Measurement of the size and -potential of particles in nC60 showed that their average diameter is 100 nm and charge about -30 mV. IR spectra of the dried dispersions showed the presence of a broadband characteristic for CO bond. Changing the solvent NMP to pyridine does not significantly affect the spectral characteristics of the resulting dispersion. Our data suggest that the fullerene molecule in nC60 is associated with MP and water molecules, and obviously is partially hydroxylated. The proposed method is promising for the preparation of aqueous solutions of endofullerenes. Copyright © Taylor & Francis Group, LLC. Source
Koloskova O.O.,Moscow State University |
Nikonova A.A.,NRC Institute of Immunology |
Budanova U.A.,Moscow State University |
Shilovskiy I.P.,NRC Institute of Immunology |
And 7 more authors.
European Journal of Pharmaceutics and Biopharmaceutics | Year: 2016
Nucleic acid-based therapeutics have recently emerged as a new class of next generation agents for treatment and prevention of viral infection, cancer, and genetic disorders, but their wide use is limited by their relatively weak delivery into target cells. Usage of synthetic cationic amphiphiles with peptide hydrophilic domain as agents for non-viral gene delivery is an attractive approach. We developed the schemes for the synthesis of aliphatic peptides with different length of the hydrocarbon chains in hydrophobic domains and different amino acids in polar head. For the obtained derivatives we determined transfection efficiency, critical vesicle concentration, particle size, ζ-potential and aggregates stability. We have found that the transfection efficiency is increased if the ornithine is a part of polar head in an amphiphile. The most promising amphiphile for liposomal formation OrnOrnGlu(C16H33)2 was examined more carefully. It has been shown that the lipopeptide possesses low toxicity (in vitro and in vivo) and high transfection efficiency with pDNA and siRNA in different cell lines. In addition, the production of liposomes based on this lipopeptide is simple, quick and cheap. Thus OrnOrnGlu(C16H33)2 is a promising vehicle for gene delivery and gene silencing. © 2016 Elsevier B.V. All rights reserved. Source