Doklady Biochemistry and Biophysics最新文献

{"title":"Real-World Retention Rate, Effectiveness, and Safety of Netakimab in the Treatment of Patients with Ankylosing Spondylitis: First Year Results of the LIBRA Post-Registration Safety Study","authors":"Sh. Erdes,&nbsp;V. I. Mazurov,&nbsp;I. Z. Gaydukova,&nbsp;O. N. Anoshenkova,&nbsp;I. B. Vinogradova,&nbsp;Yu. Yu. Grabovetskaya,&nbsp;S. Y. Davidian,&nbsp;N. A. Kiryukhina,&nbsp;O. E. Epifanova,&nbsp;L. V. Masneva,&nbsp;L. V. Menshikova,&nbsp;O. N. Mironenko,&nbsp;N. E. Nikulenkova,&nbsp;T. V. Povarova,&nbsp;A. N. Poliatika,&nbsp;R. R. Samigullina,&nbsp;A. E. Sizikov,&nbsp;I. N. Totrov,&nbsp;I. F. Umnova,&nbsp;J. V. Usacheva,&nbsp;A. L. Chudinov","doi":"10.1134/S1607672924701084","DOIUrl":"10.1134/S1607672924701084","url":null,"abstract":"<p>Netakimab has shown high efficacy in controlled clinical trials in the treatment of AS patients. This article presents results of an observational study of netakimab using in routine clinical practice.</p><p>To evaluate retention rates and safety of netakimab in patients with AS in real-world clinical practice. Additionally, the efficacy of netakimab was evaluated at 1-year follow-up.</p><p>Patients were recruited for the study from August 2020 to December 2021 at 23 centers in the Russian Federation. The study included patients who were prescribed netakimab therapy before enrollment, so clinical and medical history data for the first visit were entered retrospectively, and following visits at 12, 24, and 52 weeks of therapy were collected within the study. Drug survival rate was calculated according to Kaplan–Meier analysis.</p><p>The study included 137 (93 men and 44 women) patients with AS. The average age of patients was 42.3 (11.9) years, 34.3% of patients had previously received therapy with bDMARD, mainly TNF inhibitors. At the end of the analyzed period (52 weeks of therapy), 90.4% (95% CI, 85.4-95.7) of patients continued treatment with netakimab. The BASDAI and ASDAS-CRP showed statistically significant decreases in scores from baseline at all time points. Netakimab was well tolerated by patients; AEs, related to therapy according to the investigator’s opinion, were reported in 7 (5.1%) patients. Two patients stopped taking netakimab due to AEs (terminal ileitis and chronic colitis).</p><p>In real-world clinical practice, netakimab demonstrated high retention rates, a favorable safety profile, and sustained efficacy throughout the first year of therapy.</p>","PeriodicalId":529,"journal":{"name":"Doklady Biochemistry and Biophysics","volume":"518 1","pages":"382 - 392"},"PeriodicalIF":0.8,"publicationDate":"2024-08-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142078705","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Circadian Regulation of Expression of Carotenoid Metabolism Genes (PSY2, LCYE, CrtRB1, and NCED1) in Leaves of Tomato Solanum lycopersicum L.","authors":"M. A. Filyushin,&nbsp;A. V. Shchennikova,&nbsp;E. Z. Kochieva","doi":"10.1134/S1607672924600611","DOIUrl":"10.1134/S1607672924600611","url":null,"abstract":"<p>The circadian dynamics of the expression of key genes of carotenoid metabolism (<i>PSY2</i>, <i>LCYE</i>, <i>CrtRB1</i>, and <i>NCED1</i>) in the photosynthetic tissue of tomato <i>Solanum lycopersicum</i> L. (cultivar Korneevsky) plants was characterized. An <i>in silico</i> analysis of the gene expression pattern was carried out and a high level of their transcripts was detected in the leaf tissue. qRT-PCR analysis of gene expression was performed at six time points during the day and showed the highest levels of <i>PSY2</i>, <i>LCYE,</i> and <i>NCED1</i> transcripts in the second half of the light phase and <i>CrtRB1</i> at the end of the dark phase. The content and composition of carotenoids in leaf tissue in the middle of the day was determined; it was shown that the leaf accumulates 1.5 times more compounds of the ɛ/β-branch of carotenoid biosynthesis pathway than compounds of the β/β-branch.</p>","PeriodicalId":529,"journal":{"name":"Doklady Biochemistry and Biophysics","volume":"518 1","pages":"393 - 397"},"PeriodicalIF":0.8,"publicationDate":"2024-08-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142078699","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Aerobic Exercise Activates AMPK/PGC-1α Pathway, Inhibits Cardiomyocyte Apoptosis Improves Mitochondrial and Infarcted Heart Function","authors":"Qiu Shen,&nbsp;Xinyue Wu,&nbsp;Chuan Huang,&nbsp;Xinyu Ding,&nbsp;Chunxiao Wan","doi":"10.1134/S1607672924600556","DOIUrl":"10.1134/S1607672924600556","url":null,"abstract":"<p>Aerobic exercise (AE) has attracted considerable research attention as a non-invasive therapeutic tool in recent years. Accumulating evidence has revealed its protective role against a wide range of diseases. In this study, we aimed to establish whether AE could inhibit apoptosis in infarcted cardiomyocytes and protect the heart. AE in post-myocardial infarction (post-MI) mice improved their cardiac and physical functions. Transmission electron microscopy of myocardial tissue and adenosine 5'-triphosphate (ATP) assay findings revealed an increased mitochondrial number but decreased ATP content in the post-MI mice. Notably, this change was significantly reversed by AE. Immunofluorescence/ TUNEL staining assay results showed that AE inhibited cardiomyocyte apoptosis. Using immunoblotting of myocardial tissues, we found that AE increased the level of the anti-apoptotic protein Bcl-2/Bax, significantly decreased the expression of the pro-apoptotic protein caspase-3, and activated the AMPK/PGC-1α signaling pathway. Our findings provide evidence that AE activates the AMPK/PGC-1α signaling pathway, improves mitochondrial energy supply capacity, and effectively inhibits apoptosis in cardiomyocytes. Therefore, AE can be considered a promising post-infarction therapeutic intervention.</p>","PeriodicalId":529,"journal":{"name":"Doklady Biochemistry and Biophysics","volume":"518 1","pages":"420 - 428"},"PeriodicalIF":0.8,"publicationDate":"2024-08-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142078697","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Neuroprotective Effect of Ganoderic Acid against Focal Ischemic Stroke Induced by Middle Cerebral Artery Occlusion in the Rats via Suppression of Oxidative Stress and Inflammation","authors":"Yong Liu,&nbsp;Xuemei Feng,&nbsp;Juan Wang,&nbsp;Mingfen Li","doi":"10.1134/S1607672924600313","DOIUrl":"10.1134/S1607672924600313","url":null,"abstract":"<p>Stroke is recognized as a leading cause of disability and mortality worldwide, posing a significant challenge, particularly in developing countries. The current study aimed to evaluate the neuroprotective effect of Ganoderic acid (GA) against focal ischemic stroke in rats.</p><p> Swiss Wistar rats were used for the current study. The rats were subjected to middle cerebral artery occlusion (MCAO) to simulate transient focal ischemia, followed by reperfusion. Various neurological parameters, including infarct size, neurological deficit score, brain water content, Evans blue leakage, nitric oxide (NO), inducible nitric oxide synthase (iNOS), lactate dehydrogenase (LDH), antioxidant levels, inflammatory cytokines, apoptosis markers, inflammatory parameters, and matrix metalloproteinases (MMP) levels, were estimated. Additionally, mRNA expressions were evaluated in the brain tissue.</p><p> Dose dependently treatment of GA significantly (<i>P</i> &lt; 0.001) suppressed the infarct size, neurological deflects score, brain water, evans blue leakage, NO, iNOS, LDH, C-X-C chemokine receptor type 4 (CXCR-4), monocyte chemoattractant protein-1 (MCP-1), S100 calcium-binding protein B (S-100β) and K+-Cl− cotransporter 1 (KCC1) positive cells. GA altered the level of oxidative stress parameters like Total antioxidant capacity (T-AOC), 8-hydroxy-2'-deoxyguanosine (8-OhdG), superoxide dismutase (SOD), catalase (CAT), glutathione peroxidase (GPx), glutathione (GSH), malonaldehyde (MDA); cytokines viz., tumor necrosis factor-α (TNF-α), interleukin-1 (IL-1), IL-1β, IL-6, IL-9, IL-10; inflammatory parameters such as inducible nitric oxide synthase (iNOS), cyclooxygenase-2 (COX-2), prostaglandin (PGE₂), Nuclear factor kappa B (NF-κB); apoptosis parameters like B-cell leukemia/lymphoma 2 protein (Bcl-2), Bcl-2-associated protein x (Bax), Caspase-3; matrix metallopeptidase (MMP) parameters like MMP-2, MMP-3, and MMP-9, respectively. GA remarkably suppressed the mRNA expression of TRL-4, Syndecan-1, CSF, Aquaporin-1, OCT3, and RFX1.</p><p> Ganoderic acid exhibited the protection against the cerebral ischemia reperfusion via multiple mechanism.</p>","PeriodicalId":529,"journal":{"name":"Doklady Biochemistry and Biophysics","volume":"518 1","pages":"361 - 371"},"PeriodicalIF":0.8,"publicationDate":"2024-07-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141632300","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Study of Radiosensitivity and Induction of Radiation Adaptive Response in Peripheral Blood Lymphocytes of Patients with Oncological Diseases Using the Micronuclear Test","authors":"V. E. Balakin,&nbsp;O. M. Rozanova,&nbsp;N. S. Strelnikova,&nbsp;E. N. Smirnova,&nbsp;T. A. Belyakova","doi":"10.1134/S1607672924600362","DOIUrl":"10.1134/S1607672924600362","url":null,"abstract":"<p>Radiosensitivity to low and medium doses of X-ray radiation and the ability to induce a radiation adaptive response (RAR) of lymphocytes during in vitro irradiation of peripheral blood of patients with cancer were studied. The criterion for cytogenetic damage was the frequency of micronuclei (MN) in cytochalasin-blocked binucleate lymphocytes in culture. It was found that the spontaneous level of cytogenetic damage in the lymphocytes of patients was 2.6 times higher than in healthy volunteers, and there was also significant interindividual variability in values compared to the control cohort. There were no differences in mean values for radiosensitivity to low and medium doses of X-ray between the study groups. There was no correlation between the spontaneous level of MN in lymphocytes and the radiosensitivity of individuals in both groups. RAR was induced with the same frequency and to the same extent in lymphocytes from both patients and healthy individuals.</p>","PeriodicalId":529,"journal":{"name":"Doklady Biochemistry and Biophysics","volume":"518 1","pages":"355 - 360"},"PeriodicalIF":0.8,"publicationDate":"2024-07-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141632301","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"The Study of TRPV1 Channels of the Central Nervous System and Their Effect on Anxiety in ICR Mice","authors":"V. M. Pavlov,&nbsp;A. Yu. Fedotova,&nbsp;Y. A. Andreev,&nbsp;V. A. Palikov,&nbsp;I. A. Dyachenko","doi":"10.1134/S1607672924600325","DOIUrl":"10.1134/S1607672924600325","url":null,"abstract":"<p>The TRPV1 channel is actively involved in various neuronal processes and is found in various structures of the nervous system, including peripheral and central neurons, sensory ganglia, spinal cord, and various parts of the brain. Due to its ability to respond to various stimuli, TRPV1 can have a significant impact on the body’s responses to stress. Studies indicate the involvement of TRPV1 in the regulation of anxiety behavior. Suppression of TRPV1 activity leads to a decrease in the level of anxiety in animals, which indicates the importance of this channel in psychoemotional regulation. A promising compound for inhibiting this channel is the APHC3 peptide, which is a selective receptor antagonist. The results obtained this study show that this peptide has a pronounced anxiolytic effect, reducing the level of anxiety in the studied animals.</p>","PeriodicalId":529,"journal":{"name":"Doklady Biochemistry and Biophysics","volume":"518 1","pages":"372 - 375"},"PeriodicalIF":0.8,"publicationDate":"2024-07-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141632302","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Proinflammatory Activation of Monocytes in Patients with Immunoinflammatory Rheumatic Diseases","authors":"A. I. Bogatyreva,&nbsp;E. V. Gerasimova,&nbsp;T. V. Kirichenko,&nbsp;Yu. V. Markina,&nbsp;T. V. Popkova,&nbsp;M. V. Shalygina,&nbsp;T. V. Tolstik,&nbsp;A. M. Markin,&nbsp;A. N. Orekhov","doi":"10.1134/S1607672924700959","DOIUrl":"10.1134/S1607672924700959","url":null,"abstract":"<p>The pathogenesis of immunoinflammatory rheumatic diseases (IRDs) is based on chronic inflammation, one of the key mechanisms of which may be abnormal activation of macrophages, leading to further disruption of the immune system.</p><p>. The objective of this study was to evaluate the proinflammatory activation of circulating monocytes in patients with IRDs.</p><p>. The study involved 149 participants (53 patients with rheumatoid arthritis (RA), 45 patients with systemic lupus erythematosus (SLE), 34 patients with systemic scleroderma (SSc), and 17 participants without IRDs) 30 to 65 years old. Basal and lipopolysaccharide (LPS)-stimulated secretion of monocytes was studied in a primary culture of monocytes obtained from blood by immunomagnetic separation. Quantitative assessment of the cytokines tumor necrosis factor α (TNF-α), interleukin 1β (IL-1β), as well as the chemokine monocyte chemoattractant protein-1 (MCP-1) was carried out in the culture fluid by ELISA. Proinflammatory activation of monocytes was calculated as the ratio of LPS-stimulated and basal secretions.</p><p>. It was shown that the basal secretion of all studied cytokines was significantly increased in all groups of patients with IRDs, except for the secretion of IL-1β in the SLE group, compared to the control. LPS-stimulated secretion of TNF-α was increased and MCP-1 was decreased in patients with IRDs compared to the control group; LPS-stimulated IL-1β secretion only in the SSc group significantly differed from the control group. In the RA group, monocyte activation was reduced for all cytokines compared to the control; in the SLE group, for TNF-α and MCP-1; in the SSc group, for MCP-1.</p><p>. The decrease in proinflammatory activation of monocytes in patients with IRDs is due to a high level of basal secretion of cytokines, which can lead to disruption of the adequate immune response in these diseases and is an important link in the pathogenesis of chronic inflammation.</p>","PeriodicalId":529,"journal":{"name":"Doklady Biochemistry and Biophysics","volume":"517 1","pages":"228 - 234"},"PeriodicalIF":0.8,"publicationDate":"2024-07-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141603164","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"The 3,3'-dimethoxy-4,4'-dihydroxy-stilbene Triazole (STT) Inhibits Liver Cancer Cell Growth by Targeting Akt/mTOR Pathway","authors":"Meng Sun,&nbsp;Jiangtao Bai,&nbsp;Haisong Wang,&nbsp;Long Zhou,&nbsp;Shanfeng Li","doi":"10.1134/S1607672923600537","DOIUrl":"10.1134/S1607672923600537","url":null,"abstract":"<p>The present study was aimed to investigate the proliferation inhibitory ability of 3,3'-dimethoxy-4,4'-dihydroxy-stilbene triazole (STT) on SNU449 and Huh7 cells. Moreover, the mechanism associated with the suppression of liver cancer cell proliferation by STT was also studied. The results revealed that STT suppresses proliferation of SNU449 and Huh7 cells to 28 and 21%, respectively treatment with 20 µM. The clonogenic survival of SNU449 and Huh7 cells was also significantly reduced after incubation with STT compared to the control cultures. In comparison to the control, STT treatment significantly decreased the invasive potential of SNU449 cells. Treatment with STT led to a prominent suppression in p62 and increase in LC3B protein expression in SNU449 cells compared to the control cells. The STT treatment dramatically decreased p-Akt and p-mTOR protein expression in SNU449 cells. Docking study revealed that STT interacts <i>via</i> traditional hydrogen bonding with the glutamine, phenylalanine, leucine, serine, arginine, aspartic acid, and lysine residues of Akt protein. In summary, the current study demonstrates that STT effectively suppresses the viability of SNU449 and Huh7 liver cancer cells. Moreover, STT treatment of the liver cancer cells also significantly reduces the clonogenic survival and invasive potential of SNU449 cells. Treatment of liver cancer cells with STT increases the expression of autophagic, targets anti-autophagic protein expression and down-regulates Akt/mTOR pathway to inhibit cancer growth and proliferation. Thus, STT exhibits prominent anticancer effect and needs to be investigated further as a potential candidate for the treatment of liver cancer.</p>","PeriodicalId":529,"journal":{"name":"Doklady Biochemistry and Biophysics","volume":"517 1","pages":"277 - 284"},"PeriodicalIF":0.8,"publicationDate":"2024-07-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141603165","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Clinical Manifestations and Prognosis of Giant Cell Arteritis: A Retrospective Cohort Study","authors":"E. E. Fedorinova,&nbsp;N. M. Bulanov,&nbsp;A. D. Meshkov,&nbsp;O. O. Borodin,&nbsp;I. O. Smitienko,&nbsp;E. V. Chachilo,&nbsp;A. A. Nartov,&nbsp;A. L. Filatova,&nbsp;A. V. Naumov,&nbsp;P. I. Novikov,&nbsp;S. V. Moiseev","doi":"10.1134/S1607672924700984","DOIUrl":"10.1134/S1607672924700984","url":null,"abstract":"<p>The aim of the study was to evaluate the clinical manifestations and survival of patients with giant cell arteritis (GCA).</p><p><b>.</b> A retrospective study included 166 patients with newly diagnosed GCA. Clinical, laboratory, and instrumental data and three sets of classification criteria were used to confirm the diagnosis: the American College of Rheumatology (ACR) 1990, the revised ACR criteria of 2016 and/or the new ACR and European Alliance of Rheumatologic Associations (EULAR) 2022 criteria. Some of the patients underwent instrumental investigations: temporal artery ultrasound Doppler (<i>n</i> = 61), contrast-enhanced computed tomography (<i>n</i> = 5), CT angiography (<i>n</i> = 6), magnetic resonance imaging (<i>n</i> = 4), MR angiography (<i>n</i> = 3), and 18F-FDG PET/CT (<i>n</i> = 47). Overall and recurrence-free survival rates were analyzed using survival tables and Kaplan–Meier method.</p><p><b>.</b> The most frequent first manifestations of GCA were headache (81.8%), weakness (64%), fever (63.8%), and symptoms of rheumatic polymyalgia (56.6%). Changes in temporal arteries in color duplex scanning were detected in 44 out of 61 patients. GCs therapy was performed in all patients who agreed to be treated (<i>n</i> = 158), methotrexate was used in 49 out of 158 patients, leflunomide in 9 patients. In 45 (28.5%) out of 158 patients, a stable remission was achieved as a result of GC monotherapy; in 120 (75.9%) patients, long-term maintenance therapy with GCs was required to prevent exacerbations, including 71 (44.9%) patients in combination with methotrexate or other immunosuppressive drugs. The follow-up period of patients with a history of relapses was 21.0 (8.0–54.0) months. Relapses developed in 73 (46.2%) patients. The overall one-year survival rate was 97.1% [95% CI 94.3; 99.9], and the five-year survival rate of patients was 94.6% [95% CI 90.2; 99.0]. The one-year relapse-free survival rate was 86.4% [95% CI 80.5; 92.3], and the five-year relapse-free survival rate was 52.4% [95% CI 42.0; 62.8]. Twelve (7.2%) of 166 patients died. The cause of death was myocardial infarction in two patients, stroke in two patients, and breast cancer in one patient; in the remaining seven cases, the cause of death was not determined.</p><p>Given the high frequency of disease exacerbation, patients with GCA require long-term follow-up, especially during the first year after diagnosis.</p>","PeriodicalId":529,"journal":{"name":"Doklady Biochemistry and Biophysics","volume":"517 1","pages":"250 - 258"},"PeriodicalIF":0.8,"publicationDate":"2024-07-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141603161","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Homeotic DUX4 Genes Shape Dynamic Inter-Chromosomal Contacts with Nucleoli in Human Cells","authors":"E. S. Klushevskaya,&nbsp;I. R. Alembekov,&nbsp;Y. V. Kravatsky,&nbsp;N. A. Tchurikov","doi":"10.1134/S1607672924700935","DOIUrl":"10.1134/S1607672924700935","url":null,"abstract":"<p>Nucleoli form interchromosomal contacts with genes controlling differentiation and carcinogenesis. <i>DUX4</i> genes specify transcription factor possessing two homeodomains. Previously, using Circular Chromosome Conformation Capture (4С) approach on population of cells, it was demonstrated that <i>DUX4</i> gene clusters form frequent contacts with nucleoli. It was found also that these contacts are almost completely abolished after heat shock treatment. 4C approach as all ligation-mediated methods is capable to detect rather close interactions between chromatin loops in nuclei. In order to independently confirm the formation and the frequency of the contacts in single cells we used FISH approach. Here, we show that <i>DUX</i> genes in single cells form stable contacts in all tested HEK293T cells. During heat shock, <i>DUX4</i> genes reversibly move 1–3 µm away from the nuclei. We conclude that interchromosomal contacts formed by nucleoli are strong, dynamic, and reversible, providing both the initiation and maintenance of a differentiated state.</p>","PeriodicalId":529,"journal":{"name":"Doklady Biochemistry and Biophysics","volume":"517 1","pages":"259 - 263"},"PeriodicalIF":0.8,"publicationDate":"2024-07-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141603162","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}