Email this article NEW STRAIN OF MUTANT MICE CHARACTERIZED BY SELECTIVE RESISTANCE TO ONE OF TWO SEPTIC SHOCK PROTOCOLS
- Authors: Astrakhantseva I.V.1,2, Gladkova L.S.2, Vasilenko E.A.2, Tarabykin V.S.2,3, Drutskaya M.S.4, Nedospasov S.A.1,4,5
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Affiliations:
- Scientific and Technological University “Sirius”
- N. Lobachevsky State University
- Institute of Cell and Neurobiology, Charit – Universit tsmedizin
- V. Engelhardt Institute of Molecular Biology, Russian Academy of Sciences
- M. Lomonosov Moscow State University
- Issue: Vol 23, No 1 (2020)
- Pages: 27-34
- Section: ORIGINAL ARTICLES
- Submitted: 14.04.2020
- Accepted: 14.04.2020
- Published: 15.01.2020
- URL: https://rusimmun.ru/jour/article/view/54
- DOI: https://doi.org/10.46235/1028-7221-003-NSO
- ID: 54
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Abstract
More than 40 years ago ethyl nitrosoеurea was identified as a powerful mutagen for mammalian germ cells resulting in random point mutations in gamete DNA. This feature allowed the use of this mutagen for genetic studies on the mechanisms of various pathological and physiological processes in model organisms. In our study genome-wide mutagenesis in C3H mice by ethyl nitrosourea followed in generation F3 by selection of animals resistant to acute lethal hepatotoxicity caused by a combination of E. coli lipopolysaccharide (LPS) and D-galactosamine (D-gal). Tumor necrosis factor (TNF) is known to be a critical mediator of this pathology. Exposure to D-galactosamine increases sensitivity of hepatocytes to TNF leading to their necrosis and/or apoptosis. After double LPS/D-gal screening in F3 several mice resistant to LPS/D-gal-induced hepatotoxicity were identified, and became the founders of the corresponding “mutant” families. Using outcrossing to C57BL6 background followed by intercrossing, generations F5 and F7 were obtained. Among families of mutant animals only one family showed the resistance to the combination of LPS and D-gal, but sensitivity to TNF-D-galactosamine. This phenotype showed approximately Mendelian inheritance consistent with the recessive mutation hypothesis. This latter fact was confirmed by the sensitivity of mice from “heterozygous generations” (F4 and F6) to lethal LPS/Dgal hepatotoxicity. Primary bone marrow macrophages obtained from half of the mutant mice showed significantly reduced levels of TNF after LPS stimulation in vitro. At the same time, the serum TNF levels 1 hour after the administration of a non-lethal LPS dose did not differ in the mutant family mice and wild-type mice. These results implicate a recessive mutation either in innate TLR4-mediated signaling pathway, including proteins associated with LPS transfer, adapter molecules, components of kinase signaling cascades, transcription factors, or in enzymes involved in regulation of TLR4 cascades, such as components of the ubiquitin cycle, or in genomic regulatory sequences that control the expression of one of these genes, including the tnf gene.
About the authors
I. V. Astrakhantseva
Scientific and Technological University “Sirius”;N. Lobachevsky State University
Email: fake@neicon.ru
Astrakhantseva I.V., PhD (Biology), Senior Research Associate Russian Federation
L. S. Gladkova
N. Lobachevsky State University
Email: fake@neicon.ru
Gladkova L.S., Laboratory Assistant Russian Federation
E. A. Vasilenko
N. Lobachevsky State University
Email: fake@neicon.ru
Vasilenko E.A., Lecturer Russian Federation
V. S. Tarabykin
N. Lobachevsky State University;Institute of Cell and Neurobiology, Charit – Universit tsmedizin
Email: fake@neicon.ru
Tarabykin V.S., PhD, MD (Biology), Professor, Head, Brain Development Genetics Laboratory Institute of Biology and Biomedicine
Director
Russian FederationM. S. Drutskaya
V. Engelhardt Institute of Molecular Biology, Russian Academy of Sciences
Email: fake@neicon.ru
Drutskaya M.S., PhD (Biology), Leading Research Associate Russian Federation
S. A. Nedospasov
Scientific and Technological University “Sirius”;V. Engelhardt Institute of Molecular Biology, Russian Academy of Sciences;
M. Lomonosov Moscow State University
Author for correspondence.
Email: sergei.nedospasov@gmail.com
Nedospasov S.A., PhD, MD (Biology), Professor, Full Member, Russian Academy of Sciences, Head, Laboratory of Molecular Mechanisms of Immunity
Head, Department of Immunology, Faculty of Biology
Head, Department
Russian FederationReferences
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