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395 results on '"Chizhova, N."'

40. A Novel Laser-Based Zebrafish Model for Studying Traumatic Brain Injury and Its Molecular Targets

Author

Tikhonova, M. A., Maslov, N. A., Bashirzade, A. A., Nehoroshev, E. V., Babchenko, V. Y., Chizhova, N. D., Tsibulskaya, E. O., Akopyan, A. A., Markova, E. V., Yang, Y. -L., Lu, K. -T., Kalueff, A. V., Aftanas, L. I., Amstislavskaya, T. G., Tikhonova, M. A., Maslov, N. A., Bashirzade, A. A., Nehoroshev, E. V., Babchenko, V. Y., Chizhova, N. D., Tsibulskaya, E. O., Akopyan, A. A., Markova, E. V., Yang, Y. -L., Lu, K. -T., Kalueff, A. V., Aftanas, L. I., and Amstislavskaya, T. G.

Abstract

Traumatic brain injury (TBI) is a major public health problem. Here, we developed a novel model of non-invasive TBI induced by laser irradiation in the telencephalon of adult zebrafish (Danio rerio) and assessed their behavior and neuromorphology to validate the model and evaluate potential targets for neuroreparative treatment. Overall, TBI induced hypolocomotion and anxiety-like behavior in the novel tank test, strikingly recapitulating responses in mammalian TBI models, hence supporting the face validity of our model. NeuN-positive cell staining was markedly reduced one day, but not seven days, after TBI, suggesting increased neuronal damage immediately after the injury, and its fast recovery. The brain-derived neurotrophic factor (Bdnf) level in the brain dropped immediately after the trauma, but fully recovered seven days later. A marker of microglial activation, Iba1, was elevated in the TBI brain, albeit decreasing from Day 3. The levels of hypoxia-inducible factor 1-alpha (Hif1a) increased 30 min after the injury, and recovered by Day 7, further supporting the construct validity of the model. Collectively, these findings suggest that our model of laser-induced brain injury in zebrafish reproduces mild TBI and can be a useful tool for TBI research and preclinical neuroprotective drug screening. © 2022 by the authors.

Published
2022

41. Complexation of Halogen-Substituted Tetraphenylporphyrins and Cadmium(II) Tetraphenylporphyrins with MnCl2 in DMF.

Author

Zvezdina, S. V., Chizhova, N. V., and Mamardashvili, N. Zh.

Subjects
*MANGANESE porphyrins, *METALLOPORPHYRINS, *MACROCYCLIC compounds, *CADMIUM, *EXCHANGE reactions, *CADMIUM compounds, *CHEMICAL synthesis
Abstract

The complexation of 5,10,15,20-tetrakis(2,6-dichlorophenyl)porphyrin and 5,10,15,20-tetrakis(2,6-difluorophenyl)porphyrin and metal exchange reactions of their cadmium complexes with manganese(II) chloride in DMF were studied with the goal of finding optimal conditions for the synthesis of manganese(II) and manganese(III) complexes with tetrapyrrole macrocyclic compounds. ortho-Substituted manganese com-plexes were synthesized by prolonged heating of the corresponding porphyrins with excess MnCl2 in boiling DMF. Metal exchange reactions of cadmium(II) 5,10,15,20-tetrakis(2,6-dichlorophenyl)porphyrin and cadmium(II) 5,10,15,20-tetrakis(2,6-difluorophenyl)porphyrin with MnCl2 in DMF produced the corresponding manganese(III) tetraphenylporphyrins. In contrast, the complexation of tetraphenylporphyrins substituted at both pyrrole and phenyl rings with manganese(II) chloride in DMF under mild conditions afforded manga-nese(II) 2,3,7,8,12,13,17,18-octabromo-5,10,15,20-tetrakis(2,6-dichlorophenyl)porphyrin, which was oxidized to a mixture of manganese(II) and manganese(III) porphyrins on exposure to air, and manganese(II) 2,3,7,8,12,13,17,18-octachloro-5,10,15,20-tetrakis(2,6-difluorophenyl)porphyrin. The synthesized compounds were identified by electronic absorption spectroscopy, 1H NMR, and mass spectrometry. The metal exchange reactions of ortho-substituted cadmium(II) tetraphenylporphyrins and the complexation of 2,3,7,8,12,13,17,18-octabromo-5,10,15,20-tetrakis(2,6-dichlorophenyl)porphyrin with manganese(II) chloride in DMF were studied by spectrophotometry, and their kinetic and activation parameters were determined. A significant effect of β- and ortho-substitution on the complexation and metal exchange reactions was revealed. [ABSTRACT FROM AUTHOR]

Published
2023
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