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Moraleva AA, Malysheva MA, Khajdukov SV, Zatsepina OV. A Higher Level of Expression of the Nucleolar Protein SURF6 in Human Normal Activated Lymphocytes and in Lymphocytes of Patients with Lymphoproliferative Disorders. DOKL BIOCHEM BIOPHYS 2020; 494:261-265. [PMID: 33119830 DOI: 10.1134/s1607672920050099] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/16/2020] [Revised: 06/29/2020] [Accepted: 06/29/2020] [Indexed: 11/22/2022]
Abstract
Proliferation of mammalian cells is often accompanied by an increase in the content of the nucleolar proteins, which allows researchers to consider such proteins as potential activation markers. To test this assumption experimentally, we examined the expression pattern of the nucleolar rRNA processing factor SURF6 in normal (resting) peripheral blood lymphocytes, lymphocytes activated for proliferation in vitro, and in blood samples from patients with lymphoproliferative diseases. Using two methods (immunofluorescence and immunoblotting), we for the first time showed that the SURF6 protein is not detected in normal lymphocytes but can easily be visualized in lymphocytes after PHA activation and in lymphocytes of lymphocytic leukemia patients. The level of SURF6 expression in patients correlated with the aggressiveness of the disease development determined by the content of Ki-67-positive lymphocytes. These results allow the SURF6 nucleolar protein to be considered as a putative activation marker of lymphocytes in human blood disorders.
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Affiliation(s)
- A A Moraleva
- Shemyakin-Ovchinnikov Institute of Bioorganic Chemistry, Russian Academy of Science, Moscow, Russia
| | - M A Malysheva
- Shemyakin-Ovchinnikov Institute of Bioorganic Chemistry, Russian Academy of Science, Moscow, Russia
| | - S V Khajdukov
- Shemyakin-Ovchinnikov Institute of Bioorganic Chemistry, Russian Academy of Science, Moscow, Russia
| | - O V Zatsepina
- Shemyakin-Ovchinnikov Institute of Bioorganic Chemistry, Russian Academy of Science, Moscow, Russia.
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Ryabukha YA, Petrova DA, Zatsepina OV. Quality of Preovulatory (GV) Oocytes in Mice after Injection of eCG at Various Stages of the Estrous Cycle. Bull Exp Biol Med 2020; 168:385-389. [PMID: 31938908 DOI: 10.1007/s10517-020-04715-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/21/2019] [Indexed: 11/24/2022]
Abstract
We studied the influence of the estrous cycle on the morphology of preovulatory (germinal vesicle, GV) oocytes in mice and their capacity to meiotic maturation in vitro. After standard injections of eCG gonadotropin (PMSG, Follimag) to females at different stages of the estrous cycle, the maximum levels of GV oocytes (26±1/mouse) were isolated from the ovaries of animals injected with the hormone during estrus. The capacity of isolated GV oocytes to meiotic maturation in vitro decreased in the following order: estrus (75.5±2.3%), metestrus (67.9±3.4%), proestrus (57.8±4.4%), and diestrus (50.6±5.6%); the differences between estrus and diestrus/proestrus were significant (p<0.05). After eCG injections during estrus, GV oocytes differed from other oocytes by lesser total diameter, lesser diameter of cytoplasm, lesser thickness of zona pellucida, and moderately dilated perivitelline space. These signs reflected higher competence of the "estrous" GV oocytes for meiotic maturation in vitro. Hormone stimulation of females with eCG, with consideration for the stage of the estrous cycle, seems to be an effective method for improving the quality of GV oocytes isolated from mouse ovaries.
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Affiliation(s)
- Ya A Ryabukha
- M. M. Shemyakin and Yu. A. Ovchinnikov Institute of Bioorganic Chemistry, Russian Academy of Sciences, Moscow, Russia
| | - D A Petrova
- M. M. Shemyakin and Yu. A. Ovchinnikov Institute of Bioorganic Chemistry, Russian Academy of Sciences, Moscow, Russia
| | - O V Zatsepina
- M. M. Shemyakin and Yu. A. Ovchinnikov Institute of Bioorganic Chemistry, Russian Academy of Sciences, Moscow, Russia.
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Lavrentyeva EA, Shishova KV, Zatsepina OV. Differences in Nuclear Dynamics in Mouse GV Oocytes with a Diverse Chromatin Configuration. BIOL BULL+ 2019. [DOI: 10.1134/s1062359019040095] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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Shishova KV, Lavrentyeva EA, Khamidullina AI, Zatsepina OV. Position of the nucleus in mouse germinal vesicle–stage oocytes with different chromatin configurations. Russ J Dev Biol 2016. [DOI: 10.1134/s1062360416060060] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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Shishova KV, Lavrentyeva EA, Khamidullina AI, Zatsepina OV. [Position of the Nucleus in Mouse Germinal Vesicle–Stage Oocytes with Different Chromatin Configurations]. Ontogenez 2016; 47:331-338. [PMID: 30272883] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
The mammalian germinal vesicle–stage (GV) oocytes are divided into two major types, NSN (non-surrounded nucleolus) and SN (surrounded nucleolus), and at least one intermediate type, pSN (partly surrounded nucleolus), based on large-scale chromatin configuration. In mice, the SN oocytes are considered to be the most meiotically competent, which explains active study of their phenotypic characteristics necessary for improvement of human reproductive technologies. One of such characteristics is the position of the GV (nucleus) relative to the center of the oocyte. However, the current data on this issue are contradictory and even completely absent for pSN oocytes. In this work, we have studied the GV position in 187 mouse GV oocytes belonging to NSN, SN, and pSN types using different approaches known from the literature. Our results suggest that (1) the most abundant in all examined types of oocytes are central GVs (43– 66%) and the least abundant are peripheral GVs (12–39%); the pSN oocytes are closer to SN oocytes rather than to NSN oocytes according to the GV position; (3) the position of the nucleus in mouse GV oocytes is an ambiguous marker of large-scale chromatin configuration and, correspondingly, maturation competence of the oocyte; (4) the diversity of the GV position in NSN, SN, and pSN oocytes most likely reflects the ability of GVs to migrate; and (5) assessment of the GV position according to three variants (central, peripheral, and intermediate) is more informative as compared with two variants (central and peripheral).
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Astafev AA, Zalesskiy AD, Zatsepina OV, Kostrov AN, Krivoharchenko AS, Osychenko AA, Serobyan GA, Nadtochenko VA. Impact of tightly focused femtosecond laser pulses on nucleolus-like bodies of mouse GV oocyte and the ability of mouse oocytes to mature. DOKL BIOCHEM BIOPHYS 2016; 467:136-40. [PMID: 27193718 DOI: 10.1134/s1607672916020162] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/21/2015] [Indexed: 11/22/2022]
Abstract
Using femtosecond laser radiation, nucleolus-like bodies (NLBs) of mouse oocytes were locally dissected without damage to zona pellucida, cytoplasmic membrane, nuclear membrane, and nucleoplasm surrounding NLB. It was found that, after dissection of 2.7 × 10(-11) cm(3) of NLB material, which is approximately 5.2% of 10 μm NLB volume, the probability of germinal vesicle oocyte development to metaphase II stage of meiosis decreased 3-7 times compared to the non-treated oocytes. This result indicates that NLB material organization is significant for mouse oocyte maturation.
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Affiliation(s)
- A A Astafev
- Semenov Institute of Chemical Physics, Russian Academy of Sciences, ul. Kosygina 4, Moscow, 119991, Russia
| | - A D Zalesskiy
- Semenov Institute of Chemical Physics, Russian Academy of Sciences, ul. Kosygina 4, Moscow, 119991, Russia
| | - O V Zatsepina
- Semenov Institute of Chemical Physics, Russian Academy of Sciences, ul. Kosygina 4, Moscow, 119991, Russia.,Shemyakin-Ovchinnikov Institute of Bioorganic Chemistry, Russian Academy of Sciences, ul. Miklukho-Maklaya 16/10, Moscow, 117997, Russia
| | - A N Kostrov
- Semenov Institute of Chemical Physics, Russian Academy of Sciences, ul. Kosygina 4, Moscow, 119991, Russia
| | - A S Krivoharchenko
- Semenov Institute of Chemical Physics, Russian Academy of Sciences, ul. Kosygina 4, Moscow, 119991, Russia
| | - A A Osychenko
- Semenov Institute of Chemical Physics, Russian Academy of Sciences, ul. Kosygina 4, Moscow, 119991, Russia
| | - G A Serobyan
- Semenov Institute of Chemical Physics, Russian Academy of Sciences, ul. Kosygina 4, Moscow, 119991, Russia
| | - V A Nadtochenko
- Semenov Institute of Chemical Physics, Russian Academy of Sciences, ul. Kosygina 4, Moscow, 119991, Russia. .,Shemyakin-Ovchinnikov Institute of Bioorganic Chemistry, Russian Academy of Sciences, ul. Miklukho-Maklaya 16/10, Moscow, 117997, Russia. .,Moscow State University, Moscow, Russia.
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Zatsepina OV, Ingel FI. [CHANGING OF PHYSICO-CHEMICAL PARAMETERS OF NON-CONTACT (ELECTROCHEMICAL) ACTIVATED DRINKING WATER IS ASSOCIATED WITH INDUCTION OF GENOMIC INSTABILITY OF CULTIVATED HUMAN BLOOD LYMPHOCYTES]. Gig Sanit 2016; 95:233-241. [PMID: 27266021] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
In the article there are presented data which are the fragment of large multidisciplinary study of genetic safety of non-contact electrochemically activated water (NAW). The aim of this study was the analysis of the relation of impacts of genomic instability (micronucleus test with cytochalasin B) detected in human blood cells, cultured in medias prepared on the base of these NAWs, with physical and chemical properties of these NaWs. In experiments there were used catholytes and anolytes obtained by activation of osmotic, tap and dining bottled water As a result of such activation, all waters were shown to acquire the ability to induce genomic instability in cellular cultures. Notably in cell cultures on catholytes and anolytes these effects differed between themselves and have been associated with different physical and chemical properties of the NAWs.
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Shishova KV, Khodarovich YM, Lavrentyeva EA, Zatsepina OV. Analysis of the localization of fibrillarin and sites of pre-rRNA synthesis in the nucleolus-like bodies of mouse GV oocytes after mild treatment with proteinase K. Russ J Dev Biol 2015. [DOI: 10.1134/s1062360415030066] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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Kordyukova MY, Polzikov MA, Shishova KV, Zatsepina OV. Analysis of protein partners of the human nucleolar protein SURF6 in HeLa cells by a GST pull-down assay. Russ J Bioorg Chem 2014. [DOI: 10.1134/s1068162014040062] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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Kordiukova MI, Polzikov MA, Shishova KV, Zatsepina OV. [Identification of the protein partners of the human nucleolar protein SURF6 in HeLa cells by GST pull-down assay]. Bioorg Khim 2014; 40:421-432. [PMID: 25898752] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
The eukaryotic proteins comprising the SURF6 protein family are evolutionary conservative and housekeeping proteins however, functional roles of human SURF6 have not been studied so far. To shed light to this question in the present work we applied GST pull-down assay and used two proteins fused with GST, namely human GST-SURF6 and the conservative C-terminal domain of mouse Surf6 that has 85% homology with the C-terminus of the human SURF6 conservative domain (GST-Surf6-dom), to identify SURF6-interacting proteins in human HeLa cells. The results obtained showed that GST-SURF6 interacts with several key nucleolar RNA processing factors (B23/nucleophosmin, nucleolin, EBP2), and also with the specific cofactor of RNA polymerase I, protein UBE These results are the first experimental evidences in favor of participation of the human SURF6 protein in ribosome biogenesis, including transcription of rDNA and processing of rRNAs. The same results were obtained, when GST-Surf6-dom was used to pull-down proteins in HeLa cells. In addition, the panel of the GST-Surf6-dom protein partners, which were identified by mass-spectrometry, points to putative interactions of human SURF6 with a number of nuclear and nucleolar, proteins of other functional groups, i.e. to the protein plurifunctionality.
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Kordyukova MY, Polzikov MA, Shishova KV, Zatsepina OV. Functional significance of the human nucleolar protein SURF6, the key member of the SURF6 protein family in eukaryotes. DOKL BIOCHEM BIOPHYS 2014; 455:65-7. [PMID: 24795102 DOI: 10.1134/s1607672914020069] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/07/2013] [Indexed: 01/21/2023]
Affiliation(s)
- M Yu Kordyukova
- Shemyakin-Ovchinnikov Institute of Bioorganic Chemistry, Russian Academy of Sciences, ul. Miklukho-Maklaya 16/10, Moscow, 117997, Russia,
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Akhidova EV, Volkova TD, Koroev DO, Yakupov II, Kalintseva MV, Zavalishina LE, Kaplun AP, Zharskaia OO, Zatsepina OV, Vol'pina OM. [Obtaining of the affinity purified antibodies against survivin for the structure functional study of the protein]. Bioorg Khim 2014; 39:326-37. [PMID: 24397031 DOI: 10.1134/s1068162013030023] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Tumor-associated protein survivin is the bifunctional protein which can participate either in cell division regulation or in apoptosis inhibition depending on its localization and structure state. The aim of this work was to obtain monospecific antibodies useful for investigation of protein structure and functional features. Six affinity purified antibodies directed to different protein regions were obtained. The ability of antibodies obtained to detect survivin in tumor cells and breast cancer tissues was studied. It was shown that antibodies to (1-22) and (95-105) survivin fragments have the highest specific activity. In western-blot antibodies to (1-22) region predominantly binds with survivin-containing complex, which may be the survivin dimer as we suppose, while antibodies to (95-105) region detects only monomeric form of the protein. Breast cancer tissues study demonstrated that survivin monomer presents only in the tumor core tissues, while survivin-containing complex is expressed both in tumor core and tumor periphery tissues. It was shown that antibodies to (1-22) fragment detect predominantly nuclear survivin, which participates in mitosis regulation, while antibodies to (95-105) fragment gave nucleoplasm and cytoplasm staining at all stages of cell cycle. Thereby antibodies obtained are the useful tool for structure-functional study of survivin.
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Mironova AA, Barykina NV, Zatsepina OV. [Cytological analysis of the reaction of the nucleolar RNA and RNA-binding proteins to oxidative stress in HeLa cells]. Tsitologiia 2014; 56:489-499. [PMID: 25696992] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
The organization and functional activity of the nucleoli of mammalian cells can be modified in response to various stress factors. However, data on the reaction of nucleoli to oxidative stress remain limited. In this paper, we have studied the localization of nucleolar RNAs and two RNA-binding proteins--fibrillarin, a pre-rRNA processing factor, and nucleophosmin/B23, a pre-ribosome assembly factor, in HeLa cells exposed to 1 mM H2O2 up to four hours. We have shown that under the conditions used H2O2 does not induce death, but inhibits rDNA transcription, reduces the total RNA content in the cells and the amount of 18S rRNA in the nucleoli, and causes relocalization of fibrillarin and nucleophosmin/B23 to the nucleoplasm. To date, similar changes in the localization of fibrillarin were described in mammalian cells only after HgCl2 treatment. Redistribution of nucleophosmin/B23 observed in H2O2-treated cells occurred in mammalian cells under inhibition of rDNA transcription and early rRNA processing. Overall, this study shows the high sensitivity of the nucleoli of HeLa cells to acute oxidative stress, which is clearly evident on the cytological level.
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Zatsepina OV, Stekhin AA, Yakovleva GV. [Effects of quantum nonlocality in the water activation process]. Gig Sanit 2014:104-108. [PMID: 24749297] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
The dynamic alterations of the magnetic flux density of the water volume, activated with structurally stressed calcium carbonate in micellar form have been investigated. The phase of the associated water was established to exhibit electrical and magnetic properties, recorded by in B&E meter in the frequency range of 5Hz - 2kHz. Alterations in water Eh (redox) potential and the magnetic flux density B testify to synchronous auto-oscillatory changes. This gives evidence of non-linearity of the relationship between auto-oscillatory processes excited in the water; and reflects the nonlocal in time the relationship between the states of water, manifesting in a change of water activity on the 1st and 2nd day in negative time. The mechanism of action of associated water phase is shown to be described by de Broglie concept of matter waves with taking into account delocalized in time states of phase of electron wave packet in accordance with the transactional interpretation of quantum physics.
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Zatsepina OV, Stekhin AA, Iakovleva GV, P'ianzina IP. [Features of changes in the electrochemical properties of water activated with structurally stressed calcium carbonate in micellar form]. Gig Sanit 2013:37-40. [PMID: 24340908] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
The results of studies of electrochemical indices of waters activated with structurally stressed calcium carbonate tension in micellar form during storage are presented and these indicators of water were shown to change over time. In this case, waters, having initially superior activity over time reduce it, giving place to the waters that have at this moment an activity greater than the activity of the sample leading at the beginning. Established that the cause of this oscillatory over time change in activity is a non-local interaction between macroscopic quantum systems of activated waters located at a distance from each other. Oscillatory changes of the electrochemical indices of activated water during storage reflect the dynamic of changes in its biological properties. These changes in the electrochemical indices should be considered in evaluation of the structural and energetic state of the activated water during storage by means of introducing the correction factors.
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Zatsepina OV, Stekhin AA, Yakovleva GV. [Ion-radical oxygen species--the main indicator reflecting of the electron-donating ability of water]. Gig Sanit 2013:83-87. [PMID: 24003709] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
Experimental evidence of the electron-donor ability of drinking water with ion-molecular forms of active oxygen is reported The concentration limits of the content of peroxide ion-radicals (48 mkg /L) in the absence of molecular hydrogen peroxide in drinking water has been determined. The concentration of the peroxide ion-radical in drinking water has been proposed to be used as an index of the water biocatalytic activity.
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Barygina VV, Mironova AA, Zatsepina OV. [Parameters which affect the estimation of protein mobility by method FRAP in living cells on the example of protein fibrillarin]. Tsitologiia 2012; 54:17-24. [PMID: 22567896] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
Method FRAP (fluorescence recovery after photobleaching) in combination with confocal laser scanning microscopy represents one of the principal approaches in studying the properties of proteins in living mammal cells. However, the data of different authors on the dynamic properties of the same protein and even in cells of the same type can differ greatly. The reasons of such discrepancies were not specifically analyzed yet. In the present work, on the example of the nucleolar protein fibrillarin fused to EGFP, was studied the impact of area of the region of interest (ROI) and temperature conditions on the main dynamic characteristics of the protein, such as mobile fraction and time for half-time of fluorescence recovery after photobleaching (t1/2). Obtained results suggest that both parameters have a great impact on the estimation of mobile properties of fibrillarin-EGFP in HeLa cells. Was concluded that during FRAP experiments the area of ROI has to be standardized and, as possible, minimized. Moreover, analyzing the dynamic properties of the nucleolar proteins, which take part in the temperature-sensitive reactions, the standard temperature conditions should also be standardized.
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Costanzo M, Cisterna B, Zharskaya OO, Zatsepina OV, Biggiogera M. Discrete foci containing RNase A are found in nucleoli of HeLa cells after aging in culture. Eur J Histochem 2011; 55:e15. [PMID: 22193295 PMCID: PMC3284151 DOI: 10.4081/ejh.2011.e15] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/04/2011] [Revised: 04/08/2011] [Accepted: 04/11/2011] [Indexed: 01/28/2023] Open
Abstract
We have studied by means of ultrastructural immunocytochemistry the localization of RNase A in nuclei of HeLa cells in control conditions and following cell ageing in culture. We have found that roundish, electron dense foci, which contain a significant amount of RNase A, can be detected within nucleoli of aged cells. These bodies also contain RNA and lack ribosomal S3 proteins, and may represent either simple storage sites or areas where RNA degradation takes place.
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Affiliation(s)
- M Costanzo
- Laboratorio di Biologia Cellulare e Neurobiologia, Dipartimento di Biologia Animale, Università di Pavia, Italy
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Kordyukova MY, Zatsepina OV, Polzikov MA. Cloning, expression, and isolation from Escherichia coli of human protein SURF-6 translationally fused to glutathione-S-transferase. APPL BIOCHEM MICRO+ 2011. [DOI: 10.1134/s0003683811020062] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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Kordiukova MI, Zatsepina OV, Polzikov MA. [Cloning, expression, and isolation from Escherichia coli of human protein SURF-6 translationally fused to glutathione S-transferase]. Prikl Biokhim Mikrobiol 2011; 47:141-145. [PMID: 22808736] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
cDNA of human gene Surf-6 (hSutf-6) was amplified and cloned into vector pGEX-2T for the expression in the bacterial system of protein hSURF-6 translationally fused to glutathione S-transferase. The resulting vector is named as pGEX-2T-GST-hSurf-6. Superproducer of chimeric protein GST-hSURF-6 was obtained on the basis of Escherichia coli strain BL21-CodonPlus(DE3)-RIL. Its purification was performed by the affinity chromatography on L-glatathione-sepharose. The proportion of recombinant protein GST-hSURF-6 in the optimized conditions was not less than 15% of the total bacterial protein, and up to 7 mg of the protein was isolated from 1 liter of culture of the producer strain. The final fraction of eluate contained approximately 80% of GST-hSURF-6. The amount and the purity of the isolated protein were sufficient to immunize animals and obtain antibodies. Protein GST-hSURF-6 can also be used as an affinity ligand for revealing protein partners of hSURF-6 in human cells.
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Barygina VV, Aref’eva AS, Zatsepina OV. The role of mercury in the processes of vital activity of the human and mammalian organisms. RUSS J GEN CHEM+ 2011. [DOI: 10.1134/s1070363210130037] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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Malysheva MV, Bulycheva TI, Deĭneko NL, Samoĭlova RS, Kaplanskaia IB, Magoulas C, Zatsepina OV. [The levels of key nucleolar proteins in the lymphoid cells of healthy individuals and patients with lymphoproliferative diseases]. Klin Lab Diagn 2010:23-27. [PMID: 21395050] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
Immunocytochemical staining with specific antibodies was used to study the expression of three nucleolar proteins (fibrillarin, B23/nucleofozmin, and SURF6), which were involved in pRNA maturation, in the lymphoid cells of healthy individuals and patients with lymphoproliferative diseases and to compare it with the expression of the known proliferation marker Ki-67 protein. The results indicated that fibrillarin was detectable at the comparable level in the lymphoid cells of the patients and in the peripheral blood lymphocytes of the healthy individuals. In one fourth of the patients, the proportion of cells containing B23/nucleofozmin was noticeably higher than that in the lymphocytes of donors; however, there was no great difference in patients with different types of the disease. The number of SURF6-positive cells was directly correlated with that of Ki-67-positive cells. The maximum level (47-67%) of SUR6-positive lymphoid cells was found in splenic lymphosarcomas and mantle cell lymphoma. The findings suggest that SURG6 protein may be of additional diagnostic and prognostic value.
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Barygina VV, Veiko VP, Zatsepina OV. Analysis of nucleolar protein fibrillarin mobility and functional state in living HeLa cells. Biochemistry (Mosc) 2010; 75:979-88. [PMID: 21073418 DOI: 10.1134/s0006297910080055] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Fibrillarin is an evolutionarily-conserved and obligatory protein component of eukaryotic cell nucleoli involved in pre-rRNA processing and methylation. In vertebrates the fibrillarin molecule contains two cysteine residues (Cys99 and Cys268) whose sulfhydryl groups are able to establish intramolecular -S-S- bridges. However, the functional state of fibrillarin with reduced or oxidized thiol groups is still practically unstudied. Besides, there are no data in the literature concerning existence of the -S-S- fibrillarin form in human cells. To answer these questions, we used plasmids encoding native human fibrillarin and its mutant form devoid of cysteine residues (fibrillarinC99/268S) fused with EGFP for temporary transfection of HeLa cells. The mobile fraction localizing the enzymatically active protein molecules and the fluorescence half-recovery time characterizing the rate of enzymatic reactions were determined by the FRAP technique using a confocal laser scanning microscope. Measurements were carried out at 37 and 27°C. The results show that the fibrillarin pool in HeLa cells includes two protein forms, with reduced SH groups and with oxidized SH groups forming intramolecular -S-S- bridges between Cys99 and Cys268. However, the absence of Cys99 and Cys268 has no effect on intracellular localization of fibrillarin and its main dynamic parameters. The human fibrillarin form without disulfide bridges is included into the mobile protein fraction and is consistent with its functionally active state.
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Affiliation(s)
- V V Barygina
- Shemyakin and Ovchinnikov Institute of Bioorganic Chemistry, Russian Academy of Sciences, Moscow, 117997, Russia.
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Polzikov MA, Veĭko NN, Zharskaia OO, Magoulas KB, Zatsepina OV. [Overexpression of the nucleolar protein SURF-6 in mouse fibroblasts NIH/3T3 leads to stabilisation of intragenic transcribed spacers of the pre-rRNA]. Bioorg Khim 2010; 36:661-71. [PMID: 21063453 DOI: 10.1134/s1068162010050092] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
SURF-6 is an evolutionary conserved nucleolar protein that is required for maintenance of cell viability, but its functional significance in mammals still remains illusive. In the present work we examined effects of SURF-6 overexpression in mouse NIH/3T3 fibroblasts transfected with two plasmids. The plasmid pUHrT62-1 encodes a tetracycline-dependant trans-activator, the protein rtTA, the plasmid pBI-SURF6--the genes of EGFP (enhanced green fluorescent protein) and of mouse SURF-6 which expression was controlled by the rtTA-responsive bi-directorial promoter. Western blot analysis showed that the SURF-6 level was severely augmented in cells transfected with pUHrT62-1 and pBI-SURF6 and incubated with the inducer--doxycycline opposed to the transfected but not-induced cells. The increase of SURF-6 was observed in 24 and 48 h after adding the inducer doxycycline. Dot-hybridization of isolated RNA with biotinilated oligonucleotide probes to various regions of mouse primarily pre-rRNA transcripts showed that overexpression of SURF-6 enhanced levels of the second intragenic transcribed spacer ITS2 in about seven folds and of the 5' external transcribed spacer 5'ETS in two folds. Amounts of fragments corresponding to 18S, 5.8S and 28S rRNA remained almost unchanged. These observations for the first time demonstrated that mammalian SURF-6 helps to stabilize or prevents premature cleavage of the pre-rRNA intragenic transcribed spacers, particularly of ITS2, similar to its homologue in S. cerevisiae the protein Rrp14. Today metazoan proteins that play a similar role in ribosome biogenesis, are not described.
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Arefieva AS, Dyban PA, Krasilshchikova MS, Dobrucki JW, Zatsepina OV. Localization and composition of renal immunodeposits in mice developing HgCl2-induced autoimmune process. ACTA ACUST UNITED AC 2010. [DOI: 10.1134/s1990519x10040073] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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Sviridova-Chailakhyana TA, Zatsepina OV, Popov VI, Chailakhyan LM. Ultrastructural analysis of pronuclei inactivated by local laser irradiation during mouse zygote enucleation. Dokl Biol Sci 2010; 431:162-5. [PMID: 20506861 DOI: 10.1134/s0012496610020250] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Affiliation(s)
- T A Sviridova-Chailakhyana
- Institute of Fundamental and Experimental Biophysics, Russian Academy of Sciences, Institutskaya ul. 3, Pushchino, Moscow oblast 142290, Russia
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Aref'eva AS, Dyban PA, Krasil'shchikova MS, Dobrucki JW, Zatsepina OV. [Localization and composition of renal immunodeposits in mice developing HgCl2-induced autoimmune process]. Tsitologiia 2010; 52:477-486. [PMID: 20737906] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/29/2023]
Abstract
A characteristic feature of systemic autoimmune diseases along with appearance of autoantibodies targeting self-antigenes is deposition of immunoglobulins and components of the complement system in kidneys. However, mechanisms of the deposit formation and their cytotoxic effects still remain poorly studied. To elucidate these questions, we used SJL/J mice which are known to develop autoimmune process accompanied by the appearance of anti-fibrillarin antibodies following regular administrations of sublethal dozes of HgCl2. Using antibodies to the total murine ummunoglobulins we showed that immunodeposits were present in glomeruli of autoimmune and control (not-autoimmune) animals, but their intensity was directly correlated with the titer of anti-fibrillarin autoantibodies and was minimal in control mice. By confocal microscopy and conventional fluorescence microscopy it was defined that immunodeposits deeply penetrate glomeruli and are the most likely located within mesangial cells. In autoimmune animals, ummunoglobulins completely colocolized with the C3--component of complement, but not with the major autoantigen--the protein fibrillarin. We failed to determine the signs of cell proliferation or death in glomeruli. The most prominent difference between control and autoimmune mice was the presence if immunodeposits in renal blood vessels. These observations argue in favor of the idea that destructive and disfunctional renal lesions accompanying development of autoimmune diseases can be caused, in part, by accumulation of immunodeposits in blood vessels.
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Filyasova EI, Zatsepina OV, Khodarovich YM, Larionov OA. Growth and differentiation of cell hybrids obtained by fusing mouse PCC4aza1 teratocarcinoma cells and mouse spleen cells under different in vitro culture conditions. Russ J Dev Biol 2008. [DOI: 10.1134/s1062360408030028] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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Grigoryev AA, Zharskaya OO, Bulycheva TI, Zatsepina OV. Changes in the status of nucleolus during long-term culturing of human HeLa cells. Bull Exp Biol Med 2008; 144:345-8. [PMID: 18457033 DOI: 10.1007/s10517-007-0329-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
Abstract
Changes in the immunocytochemical status of the nucleoli during long-term (6-8 months) in vitro culturing of HeLa (carcinoma of the cervix uteri) cells were described using new A3 monoclonal antibodies selectively reacting with human cell nucleoli. The appearance of cells with abnormal location of A3 antigen was paralleled by a significant increase of culture sensitivity to some external factors (protein synthesis inhibition and oxidative stress). The data indicate that location of one of the nucleolar antigens is an indicator of the qualitative status of HeLa cells in the culture.
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Affiliation(s)
- A A Grigoryev
- M. M. Shemyakin and Yu. A. Ovchinnikov Institute of Organic Biochemistry, Russian Academy of Sciences, Moscow
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Grigoryev AA, Bulycheva TI, Sheval EV, Kalinina IA, Zatsepina OV. Cytological indicators of overall suppression of protein synthesis revealed by staining with a new monoclonal antibody. ACTA ACUST UNITED AC 2008. [DOI: 10.1134/s1990519x08020144] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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Filiasova EI, Zatsepina OV, Khodarovich IM, Larionov OA. [Growth and differentiation of cell hybrids obtained by fusing mouse PCC4azal teratocarcinoma cells and mouse spleen cells under different in vitro culture conditions]. Ontogenez 2008; 39:190-197. [PMID: 18634331] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
Cell hybrids obtained by fusing mouse PCC4azal teratocarcinoma cells and spleen cells induced to proliferation and treated with the demethylating agent 5-azacytidine prior to fusion are described. The obtained hybrids demonstrated no expression of T lymphocyte marker genes CD11 and CD45, which indicates possible somatic nucleus reprogramming by factors present in teratocarcinoma cells. Irrespective of culture conditions, cell hybrids demonstrated a relatively stable chromosome number: they lost on average no more than four chromosomes after 30 passages. Culturing in medium containing hypoxanthine, aminopterin, and thymidine (selective conditions) decreased the differentiation capacity of cell hybrids compared to nonselective conditions, which is likely due to the inhibition of their metabolism. For the first time, teratocarcinoma cell hybrid differentiation into cardiomyocytes under the influence of DMSO has been demonstrated in vitro.
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Zharskaya OO, Barsukova AS, Zatsepina OV. Effect of roscovitine, a selective cyclin B-dependent kinase 1 inhibitor, on assembly of the nucleolus in mitosis. Biochemistry (Mosc) 2008; 73:411-9. [PMID: 18457570 DOI: 10.1134/s0006297908040056] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
It is well known that at the beginning of mitosis the nucleolus disassembles but then reassembles at the end of mitosis. However, the mechanisms of these processes are still unclear. In the present work, we show for the first time that selective inhibition of cyclin B-dependent kinase 1 (CDK1) by roscovitine induces premature assembly of the nucleolus in mammalian cells in metaphase. Treatment of metaphase cells with roscovitine induces formation of structures in their cytoplasm that contain major proteins of the mature nucleolus participating in rRNA processing, such as B23/nucleophosmin, C23/nucleolin, fibrillarin, Nop52, as well as partially processed (immature) 46-45S pre-rRNA. This effect is reproducible in cells of various types; this indicates that general mechanisms regulate early stages of the nucleolus reassembly with CDK1 participation in mammalian cells. Based on our and literature data, we suggest that inactivation of the CDK1-cyclin B complex at the end of mitosis results in dephosphorylation of B23/nucleophosmin and C23/nucleolin; this facilitates their interaction with pre-rRNA and leads to formation of insoluble supramolecular complexes--nucleolus-derived foci.
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Affiliation(s)
- O O Zharskaya
- Shemyakin and Ovchinnikov Institute of Bioorganic Chemistry, Russian Academy of Sciences, Moscow 117997, Russia
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Shramova EI, Khodarovich IM, Larionov OA, Zatsepina OV. [The status of nucleolus organizing regions in hybrids of pluripotent and somatic mouse cells cultured under different conditions]. Tsitologiia 2008; 50:302-308. [PMID: 18664112] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
In the present work we examined the status of nucleolus organizing regions of mitotic chromosomes (NOR) in hybrid cells obtained by fusion of the mouse teratocarcinoma cells PCC4aza1 and adult mouse spleenocytes upon cultivation of hybrid cells under different conditions. We have shown that extended cultivation of hybrid cells in medium supplemented with HAT (hypoxanthine, aminopterin, thymidine) promotes the maintenance of NO-chromosomes, whereas under nonselective conditions elimination of NO-chromosome occurs. In nonselective medium the number of active, i. e. Ag-positive, NORs has been augmented comparatively to that observed under selective conditions. This observation directly indicates that reprogramming of the parental cell genomes in hybrid cells includes changes in the status of chromosomal NORs. The number of active NORs depends on conditions of hybrid cells culturing and may be changed by either of the two major ways--by elimination of NO-chromosomes (under nonselective conditions) or by inactivation of some NORs, when the general number of NO-chromosomes remains unaltered (under selective conditions).
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Grigor'ev AA, Bulycheva TI, Sheval' EV, Kalinina IA, Zatsepina OV. [The cytological indicators of the overall suppression of protein synthesis as revealed by staining with a new monoclonal antibody]. Tsitologiia 2008; 50:338-346. [PMID: 18664117] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
In this work we describe how the nucleolus reacts to inhibition of protein synthesis as revealed by labeling with a new monoclonal antibody A3. In normal cells A3 antigen is observed as numerous foci within the nucleolus. During mitosis A3 antigen is located in a few foci on chromosomes. Regions of A3 localization are susceptible to pepsin treatment but are not susceptible to RNAse A treatment. This fact indicates that A3 antigen is of protein nature. On the ultra structural level, A3 antigen is localized primarily at the periphery of fibrillar centers. Taken together these properties of A3 antigen suggest that it's a component of the RNA polymerase I transcription machinery. A3 antigen has an intriguing property, namely, an ability to migrate from the nucleolus to the nucleoplasm upon inhibition of protein synthesis with anisomycin, puromycin or cycloheximide. The obtained results show that the localization of A3 antigen revealed by the new monoclonal antibody may serve as a cytological indicator of the overall level of protein synthesis in vitro.
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Filyasova EI, Zatsepina OV, Larionov OA, Khodarovich YM. Obtaining hybrid mammalian cells containing diploid chromosome number. Dokl Biol Sci 2007; 411:520-3. [PMID: 17425059 DOI: 10.1134/s0012496606060299] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Affiliation(s)
- E I Filyasova
- Shemyakin-Ovchinnikov Institute of Bioorganic Chemistry, Russian Academy of Sciences, ul. Miklukho-Maklaya 16/10, Moscow, 117997 Russia
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Zharskaia OO, Zatsepina OV. [Dynamics and mechanisms of the nucleolus reorganization during mitosis]. Tsitologiia 2007; 49:355-69. [PMID: 17654824] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/16/2023]
Abstract
The nucleolus is the largest and most dynamic nuclear domain in the vast majority of eukaryotic cells. The main and universal nucleolar function is participation in ribosome biogenesis, including ribosomal DNA (rDNA) transcription, pre-rRNA processing and ribosome subunit assembly. Furthermore, the nucleolus and its proteins also participate in cell cycle regulation, apoptosis and cell aging. These nucleolar functions are realized predominantly in interphase and, apparently, are abolished during mitosis, when the nucleolus disassembles. In this review, literature and our own data on the dynamics and mechanisms of the nucleolus disassembly and reassembly during mitosis in animal and plant cells are summarized. Particular attention is paid to the results obtained by analysis of the nucleolar dynamics in living cells and to modeling of the premature assembly of nucleolus upon various experimental conditions.
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Gurchenkov VV, Polzikov MA, Magoulas C, Romanova LG, Zatsepina OV. [Properties and functions of a new nucleolar protein, Surf-6, in 3T3 mouse cells]. Bioorg Khim 2006; 31:578-85. [PMID: 16363129 DOI: 10.1007/s11171-005-0071-z] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
Abstract
The localization of the specific protein Surf-6 from nucleoli of eukaryotic cells in mitosis and its sensitivity to the treatment of cells with RNase A and DNase I in situ were studied. It was shown that, in interphase nucleoli of 3T3 mouse cells, Surf-6 is probably associated with RNA and practically is not associated with DNA. In mitosis, Surf-6 appears in forming nucleoli after the known RNA-binding proteins fibrillarin and B23/nucleofozmin, which are involved in the early and late stages of the assembly of ribosomal particles, respectively. These observations and the regularities of migration of early and late proteins of ribosome assembly to nucleoli in the telophase of mitosis led us to the presumption that Surf-6 is involved in the terminal stages of the assembly of ribosomal particles in murine cells. An immunoblot analysis of the Surf-6 content in synchronized 3T3 cells showed for the first time that Surf-6 is present at all stages of the cell cycle but its content markedly decreases when cells enter the G0 period. Conversely, the activation of cells for proliferation is accompanied by an increase in the Surf-6 content. These observations allow one to regard Surf-6 as a marker of the cell proliferative state and suggest its implication in the regulation of the cell cycle. The English version of the paper: Russian Journal of Bioorganic Chemistry, 2005, vol. 31, no. 6; see also http://www.maik.ru.
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Polyakov VY, Zatsepina OV, Kireev II, Prusov AN, Fais DI, Sheval EV, Koblyakova YV, Golyshev SA, Chentsov YS. Structural-functional model of the mitotic chromosome. Biochemistry (Moscow) 2006; 71:1-9. [PMID: 16457612 DOI: 10.1134/s0006297906010019] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
In the present review the structural role of noncoding DNA, mechanisms of differential staining of mitotic chromosomes, and structural organization of different levels of DNA compactization are discussed. A structural-functional model of the mitotic chromosome is proposed based on the principle of discreteness of structural levels of DNA compactization.
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Affiliation(s)
- V Yu Polyakov
- Belozersky Institute of Physico-Chemical Biology, Lomonosov Moscow State University, Moscow, Russia
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Tychinsky VP, Kretushev AV, Klemyashov IV, Vyshenskaya TV, Shtil AA, Zatsepina OV. Coherent Phase Microscopy, a Novel Approach to Study the Physiological State of the Nucleolus. DOKL BIOCHEM BIOPHYS 2005; 405:432-6. [PMID: 16480146 DOI: 10.1007/s10628-005-0133-4] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- V P Tychinsky
- Moscow State Institute of Radio Engineering, Electronics, and Automation (Technical University), pr: Vernadskogo 78, Moscow, 117454 Russia
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Sheval EV, Polzikov MA, Olson MOJ, Zatsepina OV. A higher concentration of an antigen within the nucleolus may prevent its proper recognition by specific antibodies. Eur J Histochem 2005; 49:117-23. [PMID: 15967739] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/03/2023] Open
Abstract
Transient transfection of HeLa cells with a plasmid encoding the full-length human fibrillarin fused to a green fluorescent protein (GFP) resulted in two major patterns of intensity of the nucleolar labeling for the chimeric protein: weak and strong. Both patterns were maintained in fibrillarin-GFP expressing cells after fixation with formaldehyde. When the fixed fibrillarin-GFP expressing cells were used for immunolabeling with antibodies to fibrillarin, only the nucleoli with a weak GFP-signal became strongly labeled, whereas those with the heavy signals were only lightly stained, if at all. A similar pattern was observed if the cells were immunolabeled with antibodies to GFP. These observations suggest that an increase in antigen accumulation within the nucleolus, which could take place under various physiological or experimental conditions, could prevent the antigen from being recognized by specific antibodies. These results have implications regarding contradictory data on localization of various nucleolar antigens obtained by conventional immunocytochemistry.
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Affiliation(s)
- E V Sheval
- A.N. Belozersky Institute of Physical and Chemical Biology, Moscow State University, Moscow, Russia
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Kunafina ER, Chaplina MV, Filyasova EI, Gibanova NV, Khodarovich YM, Larionov OA, Zatsepina OV. Activation of nucleolus organizing regions during in vitro cultivation of mouse R1 embryonic stem cells. Russ J Dev Biol 2005. [DOI: 10.1007/s11174-005-0014-x] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Kunafina ER, Chaplina MV, Filiasova EI, Gibanova NV, Khodarovich IM, Larionov OA, Zatsepina OV. [Activation of nucleolar organizers during in vitro cultivation of mouse R1 embryonic stem cells]. Ontogenez 2005; 36:102-9. [PMID: 15859476] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/02/2023]
Abstract
We studies the activities of ribosomal genes (nucleolus forming regions of chromosomes) at successive stages of cultivation of the mouse R1 embryonic stem cells. The total number and number of active nucleolar organizers were estimated by means of in situ hybridization with mouse rDNA probes and argentophilic staining of nucleolus forming chromosomes regions from the 16th until the 32nd passages. The data we obtained suggest that the total number of nucleolar organizers per metaphase plate was constant (as a rule, eight), while the mean number of active nucleolar organizers progressively increased from the early (16th) to the late (32nd) passages: 5.2 +/- 0.4 versus 7.4 +/- 0.9 argentophilic organizers per cell. Cell heterogeneity by the number of active nucleolar organizers also increased during the late passages. Taken together, these data suggest activation of DNA transcription and synthesis of ribosomes during cultivation of mouse R1 embryonic stem cells. Based on the experimental and published data, it has been proposed that activation of ribosomal genes correlates in time with a decreased capacity of embryonic stem cells for pluripotent differentiation.
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Zharskaia OO, Zatsepina OV. [Premature assembly of nucleolus-derived foci induced by a reversible hypotonic shock in metaphase CV1 and HeLa cells]. Tsitologiia 2005; 47:874-81. [PMID: 16711386] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/09/2023]
Abstract
The assembly of nucleolus-derived foci (NDF) in the cytoplasm of telophase cells is an early stage of nucleolus reassembly during mitosis. In current literature, significant attention is paid to the molecular composition of NDF and their participation in reassembly of the mature nucleolus. However, very little is known about mechanisms controlling the NDF formation. The authors have demonstrated for the first time that a reversible action of low ionic strength buffers (lypotonic shock treatment) on living mitotic human HeLa and green monkey CV1 cells triggers a premature assembly of NDF at metaphase. Like the true NDF, i. e., those assembled in telophase mitosis, NDF prematurally induced at metaphase contain RNA and proteins required for rRNA processing (fibrillarin, B23/nucliophosmin, C23/nucleolin), but lack UBF, an auxiliary factor of RNA polymerase I. We have assumed that a reversible action of hypotonic shock on metaphase cells may result in temporal increase in intracellular [Ca2+](i) that, in its turn, may induce a premature assembly of NDF under isotonic conditions. The structural integrity of the mitotic spindle apparently plays an essential role in the response of metaphase cells to hypotonic shock treatments.
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Zharskaia OO, Zatsepina OV. [Assembly of nucleolus-derived foci in various cultured mammalian cells during mitosis]. Tsitologiia 2005; 47:780-8. [PMID: 16706208] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/09/2023]
Abstract
During mitosis, rebuilding of the nucleolus is a step-wise process that, above all, includes an assembly of nucleolus-derived foci (NDF) in the cytoplasm of telophase cells. In this study, we performed a comparative analysis of NDF formation in mitotic cells of various mammalian cell cultures, such as green monkey CV1 cells, human HeLa cells, mouse 3T3 cells, and pig PK cells, both in control and following inhibition of rRNA synthesis by actinomycin D or by an adenosine analogue, DRB. The results obtained show that in all examined cell types NDF are formed shortly after or simultaneously with the onset of chromosome segregation to the poles of the mitotic spindle. However, an efficiency of NDF assembly, i.e. the number of NDF per anaphase or telophase cell, and the portion of anaphase and telophase cells containing NDF vary in different cell cultures, being most prominent in CVI and HeLa cells. In these cells, the vast majority of NDF accumulate several proteins of the mature nucleolus, such as B23/nucleophopmin, C23/nucleotin, fibrillarin, and, to a lesser extent, Nop52. The rRNA harbored by NDF is synthesized several hours prior mitosis, and plays an essential role the maintenance of NDF structural integrity. Starting from early stages of the assembly onwards, the NDF are predominantly located in the area occupied by aster microtubules of the mitotic spindle.
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Korobova FV, Romanova LG, Noniashvili EM, Dyban AP, Zatsepina OV. [Localization of chromosomal nucleus organizing regions in one-cell mouse embryos and oocytes by fluorescence in situ hybridization]. Ontogenez 2004; 35:336-45. [PMID: 15552571] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/01/2023]
Abstract
In mouse zygotes, ribosomal genes (rDNA) are transcriptionally silent and so-called "nucleolar precursor bodies" are present instead of typical nucleoli. However, the functional significance of these structures remains obscure. Specifically, it remains unknown whether structural association between the nucleolar precursor bodies and rDNA are maintained when rDNA synthesis is switched off. Here, we studied for the first time the rDNA topology in one-cell mouse embryos and MII oocytes using fluorescence in situ hybridization and mouse rDNA probes. Our data suggest that in the pronuclei of one-cell embryos, rDNAs form rather compact clusters, whose number does not exceed that of nucleolus organizing chromosomes characteristic for the haploid set of mouse chromosomes. In zygotic pronuclei, not all nucleolar precursor bodies are associated with rDNA and not all rDNA repeats are attached to the nucleolar precursor bodies. Altogether, these data favor the idea that spatial interactions of nucleolus organizing chromosomes and nucleolar precursor bodies are not obligatory. We assume that associations between nucleolar precursor bodies and nucleolus organizing chromosomal regions are mediated by centromeric heterochromatin. The total numbers of silver stained nucleolus organizing chromosomes in CBA and C57BL mice are different. rDNA genes are unequally distributed among nucleolus organizing chromosomes and nucleolus organizing regions of sister chromatids.
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Korobova FV, Romanova LG, Noniashvili EM, Dyban AP, Zatsepina OV. Localization of Nucleus Organizing Regions (NORs) in One-Cell Mouse Embryos and Oocytes by Fluorescence in situ Hybridization. Russ J Dev Biol 2004. [DOI: 10.1023/b:rudo.0000043819.91115.ee] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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Levitskiĭ SA, Mukhar'iamova KS, Veĭko VP, Zatsepina OV. [Identification of signal sequences determining the specific nucleolar localization of fibrillarin in HeLa cells]. Mol Biol (Mosk) 2004; 38:483-92. [PMID: 15285618] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/30/2023]
Abstract
Fibrillarin is one of the major nucleolar proteins and is involved in pre-rRNA maturation. Its three main regions are a glycine and arginine-rich (GAR) domain, an RNA-binding domain, and an alpha-helical region, which presumably has a methyltransferase activity. Yet the roles of these regions in nucleolus-specific localization of fibrillarin are still unclear. To elucidate this issue, a series of plasmids was constructed to express human fibrillarin mutants fused with the green fluorescent protein. Localization of the chimeric proteins was studied in interphase and mitotic HeLa cells after single transfection with the plasmids. Deletion or a mutation of any domain proved to alter the specific fibrillarin location coinciding with sites of pre-rRNA synthesis. The GAR domain and the first spacer together were sufficient for fibrillarin migration into the nucleolus. Fibrillarin mutants located within the interphase nucleolus did not differ in mitotic location from the wild-type fibrillarin.
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Levitskiy SA, Mukharyamova KS, Veiko VP, Zatsepina OV. Identification of Signal Sequences Determining the Specific Nucleolar Localization of Fibrillarin in HeLa Cells. Mol Biol 2004. [DOI: 10.1023/b:mbil.0000032212.84781.31] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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Smirnova OI, Mishina VA, Zatsepina OV. [Cytopathological effects of protein synthesis inhibitor emetine on HeLa cells and their nucleoli]. Tsitologiia 2003; 45:1179-87. [PMID: 15027350] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 04/29/2023]
Abstract
Eukaryotic cell nucleolus is a highly dynamic structure, which is sensitive to all changes within or outside cell borders. Numerous data are available on changes of the nucleolar structure and functions under different treatments. However, almost nothing is known about the action of translation inhibitors on the nucleolus, although these substances, together with TNF-alpha, are commonly used for apoptosis induction, both for scientific and therapeutic purposes. Emetine is one of such inhibitors. We have shown that emetine suppresses cell viability, decreases mitotic index, and induces apoptosis in HeLa cells. Emetine action is irreversible, and it sensitizes cells to unfavourable external conditions. The emetine action causes redistribution of UBF, one of RNA-polymerase I factor, from the nucleolus to nucleoplasm even after a short exposure, i.e. when the morphology of the nucleus and chromatin still keeps its native pattern. It is important that other nucleolar proteins, such as fibrillarin and B23, are not recognized in the nucleoplasm until the very late stages of apoptotic process. A suggestion is made that changes in UBF localization may be associated with the onset of ribosomal repeat cleavage and migration of rDNA-"free" fragments from the nucleolus to nucleoplasm. It looks likely that these changes can serve as an initial morphological indication of apoptosis.
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Affiliation(s)
- O Iu Smirnova
- A. N. Belozersky Institute of Physical and Chemical Biology, Moscow State University
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Zharskaia OO, Barsukova AS, Medzhidova AA, Fedorova NE, Kushch AA, Zatsepina OV. [Activation of transcription of ribosome genes following human embryo fibroblast infection with cytomegalovirus in vitro]. Tsitologiia 2003; 45:690-701. [PMID: 14989163] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 04/29/2023]
Abstract
Cytomegalovirus (CMV) infection of human diploid embryo fibroblasts in vitro causes a massive cell death on the 3-4th day of infection with a high primary infection coefficient (1-5 U/cell). Cytopathological effects of viral infection on the 3-4th day includes diminishes of the cell size, changes in their form, compaction of the nuclear chromatin, and disorganization and inactivation of the nucleolus. However, the early stages of the viral infection progression (the 1st-2nd day) are accompanied by unequivocal activation of rDNA (ribosomal gene) and the bulk of chromatin transcription. There are several features to support this conclusion: In the early CMV-infected cell 1) the nucleolar size is increased; 2) the number of intranucleolar foci binding the specific RNA-polymerase I transcription factor (UBF) is augmented; 3) the Ag-NOR staining is enhanced; 4) 3H-uridine incorporation to the nucleoli is activated; 5) the ultrastructure of the nucleolus is changed. Altogether, these data argue in favor of activation of rDNA transcription in human fibroblasts in vitro at the initial stages of infection.
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Affiliation(s)
- O O Zharskaia
- A. N. Belozersky Institute of Physico-Chemical Biology, Moscow State University
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