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1.


   
    Development of Cellular and Enzymatic Bioluminescent Assay Systems to Study Low-Dose Effects of Thorium / O. V. Kolesnik, T. V. Rozhko, M. A. Lapina [et al.] // Bioengineering-Basel. - 2021. - Vol. 8, Is. 12. - Ст. 194, DOI 10.3390/bioengineering8120194. - Cited References:77 . - ISSN 2306-5354
РУБ Biotechnology & Applied Microbiology + Engineering, Biomedical

Кл.слова (ненормированные):
bioassay -- bioluminescence -- luminous bacteria -- enzymes -- reactive oxygen -- species -- thorium -- low-dose exposure -- radiation hormesis
Аннотация: Thorium is one of the most widespread radioactive elements in natural ecosystems, along with uranium, it is the most important source of nuclear energy. However, the effects of thorium on living organisms have not been thoroughly studied. Marine luminescent bacteria and their enzymes are optimal bioassays for studying low-dose thorium exposures. Luminescent bioassays provide a quantitative measure of toxicity and are characterized by high rates, sensitivity, and simplicity. It is known that the metabolic activity of bacteria is associated with the production of reactive oxygen species (ROS). We studied the effects of thorium-232 (10(-11)-10(-3) M) on Photobacterium phosphoreum and bacterial enzymatic reactions; kinetics of bacterial bioluminescence and ROS content were investigated in both systems. Bioluminescence activation was revealed under low-dose exposures (<0.1 Gy) and discussed in terms of "radiation hormesis". The activation was accompanied by an intensification of the oxidation of a low-molecular reducer, NADH, during the enzymatic processes. Negative correlations were found between the intensity of bioluminescence and the content of ROS in bacteria and enzyme systems; an active role of ROS in the low-dose activation by thorium was discussed. The results contribute to radioecological potential of bioluminescence techniques adapted to study low-intensity radioactive exposures.

WOS
Держатели документа:
RAS, Krasnoyarsk Sci Ctr SB, Inst Biophys SB, Fed Res Ctr, Krasnoyarsk 660036, Russia.
Siberian Fed Univ, Biophys Dept, Krasnoyarsk 660041, Russia.
Krasnoyarsk State Med Acad, Krasnoyarsk 660022, Russia.
Natl Res Tomsk Polytech Univ, Tomsk 634050, Russia.

Доп.точки доступа:
Kolesnik, Olga V.; Rozhko, Tatiana V.; Lapina, Maria A.; Solovyev, Vladislav S.; Sachkova, Anna S.; Kudryasheva, Nadezhda S.; Kolesnik, Olga

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