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Rakhmatullina AR, Zolotykh MA, Filina YV, Mingaleeva RN, Sagdeeva AR, Boulygina EA, Gafurbaeva DU, Bulatov ER, Rizvanov AA, Miftakhova RR. Development of a novel prostate Cancer-Stroma Sphere (CSS) model for In Vitro tumor microenvironment studies. Transl Oncol 2024; 44:101930. [PMID: 38520912 PMCID: PMC10981155 DOI: 10.1016/j.tranon.2024.101930] [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: 01/10/2024] [Revised: 02/21/2024] [Accepted: 03/05/2024] [Indexed: 03/25/2024] Open
Abstract
Tumor employs non-cancerous cells to gain beneficial features that promote growth and survival of cancer cells. Despite intensive research in the area of tumor microenvironment, there is still a lack of reliable and reproducible in vitro model for tumor and tumor-microenvironment cell interaction studies. Herein we report the successful development of a heterogeneous cancer-stroma sphere (CSS) model composed of prostate adenocarcinoma PC3 cells and immortalized mesenchymal stem cells (MSC). The CSS model demonstrated a structured spatial layout of the cells, with stromal cells concentrated at the center of the spheres and tumor cells located on the periphery. Significant increase in the levels of VEGFA, IL-10, and IL1a has been detected in the conditioned media of CSS as compared to PC3 spheres. Single cell RNA sequencing data revealed that VEGFA was secreted by MSC cells within heterogeneous spheroids. Enhanced expression of extracellular membrane (ECM) proteins was also shown for CSS-derived MSCs. Furthermore, we demonstrated that the multicellular architecture altered cancer cell response to chemotherapeutic agents: the inhibition of sphere formation by topotecan was 74.92 ± 4.56 % for PC3 spheres and 45.95 ± 7.84 % for CSS spheres (p < 0.01), docetaxel showed 37,51± 20,88 % and 15,67± 14,08 % inhibition, respectively (p < 0.05). Thus, CSS present an effective in vitro model for examining the extracellular matrix composition and cell-to-cell interactions within the tumor, as well as for evaluating the antitumor activity of drugs.
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Affiliation(s)
- Aigul R Rakhmatullina
- Institute of Fundamental Medicine and Biology, Kazan Federal University, 420008 Kazan, Russia
| | - Maria A Zolotykh
- Institute of Fundamental Medicine and Biology, Kazan Federal University, 420008 Kazan, Russia
| | - Yulia V Filina
- Institute of Fundamental Medicine and Biology, Kazan Federal University, 420008 Kazan, Russia
| | - Rimma N Mingaleeva
- Institute of Fundamental Medicine and Biology, Kazan Federal University, 420008 Kazan, Russia
| | - Aisylu R Sagdeeva
- Institute of Fundamental Medicine and Biology, Kazan Federal University, 420008 Kazan, Russia
| | - Eugenia A Boulygina
- Institute of Fundamental Medicine and Biology, Kazan Federal University, 420008 Kazan, Russia
| | - Dina U Gafurbaeva
- Institute of Fundamental Medicine and Biology, Kazan Federal University, 420008 Kazan, Russia
| | - Emil R Bulatov
- Institute of Fundamental Medicine and Biology, Kazan Federal University, 420008 Kazan, Russia; Shemyakin-Ovchinnikov Institute of Bioorganic Chemistry, Russian Academy of Sciences, 117997 Moscow, Russia
| | - Albert A Rizvanov
- Institute of Fundamental Medicine and Biology, Kazan Federal University, 420008 Kazan, Russia; Division of Medical and Biological Sciences, Academy of Sciences of the Republic of Tatarstan, 420013, Kazan, Russia; I.K. Akhunbaev Kyrgyz state medical academy, 720020, Bishkek, Kyrgyzstan
| | - Regina R Miftakhova
- Institute of Fundamental Medicine and Biology, Kazan Federal University, 420008 Kazan, Russia.
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2
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Boldinova EO, Baranovskiy AG, Filina YV, Miftakhova RR, Shamsutdinova YF, Tahirov TH, Makarova AV. PrimPol Variant V102A with Altered Primase and Polymerase Activities. J Mol Biol 2024; 436:168542. [PMID: 38492718 DOI: 10.1016/j.jmb.2024.168542] [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] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/05/2024] [Revised: 03/10/2024] [Accepted: 03/12/2024] [Indexed: 03/18/2024]
Abstract
PrimPol is a human DNA primase-polymerase which restarts DNA synthesis beyond DNA lesions and non-B DNA structures blocking replication. Disfunction of PrimPol in cells leads to slowing of DNA replication rates in mitochondria and nucleus, accumulation of chromosome aberrations, cell cycle delay, and elevated sensitivity to DNA-damaging agents. A defective PrimPol has been suggested to be associated with the development of ophthalmic diseases, elevated mitochondrial toxicity of antiviral drugs and increased cell resistance to chemotherapy. Here, we describe a rare missense PrimPol variant V102A with altered biochemical properties identified in patients suffering from ovarian and cervical cancer. The Val102 to Ala substitution dramatically reduced both the primase and DNA polymerase activities of PrimPol as well as specifically decreased its ability to incorporate ribonucleotides. Structural analysis indicates that the V102A substitution can destabilize the hydrophobic pocket adjacent to the active site, affecting dNTP binding and catalysis.
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Affiliation(s)
- Elizaveta O Boldinova
- National Research Center "Kurchatov Institute", Kurchatov sq. 2, 123182 Moscow, Russia; Institute of Gene Biology, Russian Academy of Sciences, Vavilova 34 / 5, 119334 Moscow, Russia
| | - Andrey G Baranovskiy
- Eppley Institute for Research in Cancer and Allied Diseases, Fred & Pamela Buffett Cancer Center, University of Nebraska Medical Center, Omaha, NE 68198, USA
| | - Yulia V Filina
- "Translational Oncology" Research Laboratory, Institute of Fundamental Medicine and Biology, Kazan Federal University, Kremlevskaya 18, 420008 Kazan, Russia
| | - Regina R Miftakhova
- "Translational Oncology" Research Laboratory, Institute of Fundamental Medicine and Biology, Kazan Federal University, Kremlevskaya 18, 420008 Kazan, Russia
| | - Yana F Shamsutdinova
- Chemotherapy Department №1, Republican Clinical Oncology Dispensary of the Ministry of Health of the Republic of Tatarstan Named After Prof. M.Z. Sigal, Sibirskiy trakt 29, 420029 Kazan, Russia
| | - Tahir H Tahirov
- Eppley Institute for Research in Cancer and Allied Diseases, Fred & Pamela Buffett Cancer Center, University of Nebraska Medical Center, Omaha, NE 68198, USA
| | - Alena V Makarova
- National Research Center "Kurchatov Institute", Kurchatov sq. 2, 123182 Moscow, Russia; Institute of Gene Biology, Russian Academy of Sciences, Vavilova 34 / 5, 119334 Moscow, Russia.
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3
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Zolotykh MA, Mingazova LA, Filina YV, Blatt NL, Nesterova AI, Sabirov AG, Rizvanov AA, Miftakhova RR. Cancer of unknown primary and the «seed and soil» hypothesis. Crit Rev Oncol Hematol 2024; 196:104297. [PMID: 38350543 DOI: 10.1016/j.critrevonc.2024.104297] [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] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/01/2023] [Revised: 01/15/2024] [Accepted: 02/09/2024] [Indexed: 02/15/2024] Open
Abstract
The worldwide incidence rate of cancer of unknown primary (CUP) reaches 5% (Kang et al, 2021; Lee, Sanoff, 2020; Yang et al, 2022). CUP has an alarmingly high mortality rate, with 84% of patients succumbing within the first year following diagnosis (Registration and Service, 2018). Under normal circumstances, tumor cell metastasis follows the «seed and soil» hypothesis, displaying a tissue-specific pattern of cancer cell homing behavior based on the microenvironment composition of secondary organs. In this study, we questioned whether seed and soil concept applies to CUP, and whether the pattern of tumor and metastasis manifestations for cancer of known primary (CKP) can be used to inform diagnostic strategies for CUP. We compared data from metastatic and primary CUP foci to the metastasis patterns observed in CKP. Furthermore, we evaluated several techniques for identifying the tissue-of-origin (TOO) in CUP profiling, including DNA, RNA, and epigenetic TOO techniques.
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Affiliation(s)
- Mariya A Zolotykh
- Institute of Fundamental Medicine and Biology, Kazan Federal University, Kazan, Russian Federation.
| | - Leysan A Mingazova
- Institute of Fundamental Medicine and Biology, Kazan Federal University, Kazan, Russian Federation.
| | - Yuliya V Filina
- Institute of Fundamental Medicine and Biology, Kazan Federal University, Kazan, Russian Federation.
| | - Nataliya L Blatt
- Institute of Fundamental Medicine and Biology, Kazan Federal University, Kazan, Russian Federation.
| | - Alfiya I Nesterova
- Institute of Fundamental Medicine and Biology, Kazan Federal University, Kazan, Russian Federation; Republican Clinical Oncology Dispensary named after prof. M.Z.Sigal, Kazan, Russian Federation.
| | - Alexey G Sabirov
- Republican Clinical Oncology Dispensary named after prof. M.Z.Sigal, Kazan, Russian Federation
| | - Albert A Rizvanov
- Institute of Fundamental Medicine and Biology, Kazan Federal University, Kazan, Russian Federation.
| | - Regina R Miftakhova
- Institute of Fundamental Medicine and Biology, Kazan Federal University, Kazan, Russian Federation.
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4
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Gabdoulkhakova AG, Mingaleeva RN, Romozanova AM, Sagdeeva AR, Filina YV, Rizvanov AA, Miftakhova RR. Immunology of SARS-CoV-2 Infection. Biochemistry (Mosc) 2024; 89:65-83. [PMID: 38467546 DOI: 10.1134/s0006297924010048] [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] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/14/2023] [Revised: 11/17/2023] [Accepted: 11/18/2023] [Indexed: 03/13/2024]
Abstract
According to the data from the World Health Organization, about 800 million of the world population had contracted coronavirus infection caused by SARS-CoV-2 by mid-2023. Properties of this virus have allowed it to circulate in the human population for a long time, evolving defense mechanisms against the host immune system. Severity of the disease depends largely on the degree of activation of the systemic immune response, including overstimulation of macrophages and monocytes, cytokine production, and triggering of adaptive T- and B-cell responses, while SARS-CoV-2 evades the immune system actions. In this review, we discuss immune responses triggered in response to the SARS-CoV-2 virus entry into the cell and malfunctions of the immune system that lead to the development of severe disease.
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Affiliation(s)
- Aida G Gabdoulkhakova
- Kazan Federal University, Kazan, 420008, Russia.
- Kazan State Medical Academy - Branch Campus of the Federal State Budgetary Educational Institution of Further Professional Education "Russian Medical Academy of Continuous Professional Education" of the Ministry of Health of the Russian Federation, Kazan, 420012, Russia
| | | | | | | | | | - Albert A Rizvanov
- Kazan Federal University, Kazan, 420008, Russia
- Division of Medical and Biological Sciences, Tatarstan Academy of Sciences, Kazan, 420111, Russia
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Rakhmatullina AR, Mingaleeva RN, Gafurbaeva DU, Glazunova ON, Sagdeeva AR, Bulatov ER, Rizvanov AA, Miftakhova RR. Adipose-Derived Mesenchymal Stem Cell (MSC) Immortalization by Modulation of hTERT and TP53 Expression Levels. J Pers Med 2023; 13:1621. [PMID: 38003936 PMCID: PMC10672200 DOI: 10.3390/jpm13111621] [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] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/11/2023] [Revised: 11/03/2023] [Accepted: 11/13/2023] [Indexed: 11/26/2023] Open
Abstract
Mesenchymal stem cells (MSCs) are pivotal players in tissue repair and hold great promise as cell therapeutic agents for regenerative medicine. Additionally, they play a significant role in the development of various human diseases. Studies on MSC biology have encountered a limiting property of these cells, which includes a low number of passages and a decrease in differentiation potential during in vitro culture. Although common methods of immortalization through gene manipulations of cells are well established, the resulting MSCs vary in differentiation potential compared to primary cells and eventually undergo senescence. This study aimed to immortalize primary adipose-derived MSCs by overexpressing human telomerase reverse transcriptase (hTERT) gene combined with a knockdown of TP53. The research demonstrated that immortalized MSCs maintained a stable level of differentiation into osteogenic and chondrogenic lineages during 30 passages, while also exhibiting an increase in cell proliferation rate and differentiation potential towards the adipogenic lineage. Long-term culture of immortalized cells did not alter cell morphology and self-renewal potential. Consequently, a genetically stable line of immortalized adipose-derived MSCs (iMSCs) was established.
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Affiliation(s)
- Aigul R. Rakhmatullina
- Institute of Fundamental Medicine and Biology, Kazan Federal University, 420008 Kazan, Russia
| | - Rimma N. Mingaleeva
- Institute of Fundamental Medicine and Biology, Kazan Federal University, 420008 Kazan, Russia
| | - Dina U. Gafurbaeva
- Institute of Fundamental Medicine and Biology, Kazan Federal University, 420008 Kazan, Russia
| | - Olesya N. Glazunova
- Institute of Fundamental Medicine and Biology, Kazan Federal University, 420008 Kazan, Russia
| | - Aisylu R. Sagdeeva
- Institute of Fundamental Medicine and Biology, Kazan Federal University, 420008 Kazan, Russia
| | - Emil R. Bulatov
- Institute of Fundamental Medicine and Biology, Kazan Federal University, 420008 Kazan, Russia
- Shemyakin-Ovchinnikov Institute of Bioorganic Chemistry, Russian Academy of Sciences, 117997 Moscow, Russia
| | - Albert A. Rizvanov
- Institute of Fundamental Medicine and Biology, Kazan Federal University, 420008 Kazan, Russia
| | - Regina R. Miftakhova
- Institute of Fundamental Medicine and Biology, Kazan Federal University, 420008 Kazan, Russia
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6
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Pashirova T, Shaihutdinova Z, Tatarinov D, Mansurova M, Kazakova R, Bogdanov A, Chabrière E, Jacquet P, Daudé D, Akhunzianov AA, Miftakhova RR, Masson P. Tuning the Envelope Structure of Enzyme Nanoreactors for In Vivo Detoxification of Organophosphates. Int J Mol Sci 2023; 24:15756. [PMID: 37958742 PMCID: PMC10649860 DOI: 10.3390/ijms242115756] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/16/2023] [Revised: 10/26/2023] [Accepted: 10/26/2023] [Indexed: 11/15/2023] Open
Abstract
Encapsulated phosphotriesterase nanoreactors show their efficacy in the prophylaxis and post-exposure treatment of poisoning by paraoxon. A new enzyme nanoreactor (E-nRs) containing an evolved multiple mutant (L72C/Y97F/Y99F/W263V/I280T) of Saccharolobus solfataricus phosphotriesterase (PTE) for in vivo detoxification of organophosphorous compounds (OP) was made. A comparison of nanoreactors made of three- and di-block copolymers was carried out. Two types of morphology nanoreactors made of di-block copolymers were prepared and characterized as spherical micelles and polymersomes with sizes of 40 nm and 100 nm, respectively. The polymer concentrations were varied from 0.1 to 0.5% (w/w) and enzyme concentrations were varied from 2.5 to 12.5 μM. In vivo experiments using E-nRs of diameter 106 nm, polydispersity 0.17, zeta-potential -8.3 mV, and loading capacity 15% showed that the detoxification efficacy against paraoxon was improved: the LD50 shift was 23.7xLD50 for prophylaxis and 8xLD50 for post-exposure treatment without behavioral alteration or functional physiological changes up to one month after injection. The pharmacokinetic profiles of i.v.-injected E-nRs made of three- and di-block copolymers were similar to the profiles of the injected free enzyme, suggesting partial enzyme encapsulation. Indeed, ELISA and Western blot analyses showed that animals developed an immune response against the enzyme. However, animals that received several injections did not develop iatrogenic symptoms.
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Affiliation(s)
- Tatiana Pashirova
- Arbuzov Institute of Organic and Physical Chemistry, FRC Kazan Scientific Center, Russian Academy of Sciences, Arbuzov Str., 8, 420088 Kazan, Russia; (Z.S.); (D.T.); (A.B.)
| | - Zukhra Shaihutdinova
- Arbuzov Institute of Organic and Physical Chemistry, FRC Kazan Scientific Center, Russian Academy of Sciences, Arbuzov Str., 8, 420088 Kazan, Russia; (Z.S.); (D.T.); (A.B.)
- Institute of Fundamental Medicine and Biology, Kazan Federal University, 420008 Kazan, Russia; (M.M.); (R.K.); (A.A.A.); (R.R.M.)
| | - Dmitry Tatarinov
- Arbuzov Institute of Organic and Physical Chemistry, FRC Kazan Scientific Center, Russian Academy of Sciences, Arbuzov Str., 8, 420088 Kazan, Russia; (Z.S.); (D.T.); (A.B.)
| | - Milana Mansurova
- Institute of Fundamental Medicine and Biology, Kazan Federal University, 420008 Kazan, Russia; (M.M.); (R.K.); (A.A.A.); (R.R.M.)
| | - Renata Kazakova
- Institute of Fundamental Medicine and Biology, Kazan Federal University, 420008 Kazan, Russia; (M.M.); (R.K.); (A.A.A.); (R.R.M.)
| | - Andrei Bogdanov
- Arbuzov Institute of Organic and Physical Chemistry, FRC Kazan Scientific Center, Russian Academy of Sciences, Arbuzov Str., 8, 420088 Kazan, Russia; (Z.S.); (D.T.); (A.B.)
| | - Eric Chabrière
- Gene&GreenTK, 19–21 Boulevard Jean Moulin, 13005 Marseille, France; (E.C.); (P.J.); (D.D.)
- IRD, APHM, MEPHI, IHU-Méditerranée Infection, Aix Marseille Université, 19–21 Boulevard Jean Moulin, 13005 Marseille, France
| | - Pauline Jacquet
- Gene&GreenTK, 19–21 Boulevard Jean Moulin, 13005 Marseille, France; (E.C.); (P.J.); (D.D.)
| | - David Daudé
- Gene&GreenTK, 19–21 Boulevard Jean Moulin, 13005 Marseille, France; (E.C.); (P.J.); (D.D.)
| | - Almaz A. Akhunzianov
- Institute of Fundamental Medicine and Biology, Kazan Federal University, 420008 Kazan, Russia; (M.M.); (R.K.); (A.A.A.); (R.R.M.)
| | - Regina R. Miftakhova
- Institute of Fundamental Medicine and Biology, Kazan Federal University, 420008 Kazan, Russia; (M.M.); (R.K.); (A.A.A.); (R.R.M.)
| | - Patrick Masson
- Institute of Fundamental Medicine and Biology, Kazan Federal University, 420008 Kazan, Russia; (M.M.); (R.K.); (A.A.A.); (R.R.M.)
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7
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Akhunzianov AA, Nesterova AI, Wanrooij S, Filina YV, Rizvanov AA, Miftakhova RR. Unravelling the Therapeutic Potential of Antibiotics in Hypoxia in a Breast Cancer MCF-7 Cell Line Model. Int J Mol Sci 2023; 24:11540. [PMID: 37511298 PMCID: PMC10380719 DOI: 10.3390/ijms241411540] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [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: 06/10/2023] [Revised: 07/04/2023] [Accepted: 07/11/2023] [Indexed: 07/30/2023] Open
Abstract
Antibiotics inhibit breast cancer stem cells (CSCs) by suppressing mitochondrial biogenesis. However, the effectiveness of antibiotics in clinical settings is inconsistent. This inconsistency raises the question of whether the tumor microenvironment, particularly hypoxia, plays a role in the response to antibiotics. Therefore, the goal of this study was to evaluate the effectiveness of five commonly used antibiotics for inhibiting CSCs under hypoxia using an MCF-7 cell line model. We assessed the number of CSCs through the mammosphere formation assay and aldehyde dehydrogenase (ALDH)-bright cell count. Additionally, we examined the impact of antibiotics on the mitochondrial stress response and membrane potential. Furthermore, we analyzed the levels of proteins associated with therapeutic resistance. There was no significant difference in the number of CSCs between cells cultured under normoxic and hypoxic conditions. However, hypoxia did affect the rate of CSC inhibition by antibiotics. Specifically, azithromycin was unable to inhibit sphere formation in hypoxia. Erythromycin and doxycycline did not reduce the ratio of ALDH-bright cells, despite decreasing the number of mammospheres. Furthermore, treatment with chloramphenicol, doxycycline, and tetracycline led to the overexpression of the breast cancer resistance protein. Our findings suggest that hypoxia may weaken the inhibitory effects of antibiotics on the breast cancer model.
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Affiliation(s)
- Almaz A Akhunzianov
- Institute of Fundamental Medicine and Biology, Kazan Federal University, 420008 Kazan, Russia
| | - Alfiya I Nesterova
- Institute of Fundamental Medicine and Biology, Kazan Federal University, 420008 Kazan, Russia
- Republican Clinical Oncology Dispensary Named after Prof. M.Z. Sigal, 420029 Kazan, Russia
| | - Sjoerd Wanrooij
- Department of Medical Biochemistry and Biophysics, Faculty of Medicine, Umeå University, 907 36 Umeå, Sweden
| | - Yulia V Filina
- Institute of Fundamental Medicine and Biology, Kazan Federal University, 420008 Kazan, Russia
| | - Albert A Rizvanov
- Institute of Fundamental Medicine and Biology, Kazan Federal University, 420008 Kazan, Russia
| | - Regina R Miftakhova
- Institute of Fundamental Medicine and Biology, Kazan Federal University, 420008 Kazan, Russia
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8
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Mingaleeva RN, Nigmatulina NA, Sharafetdinova LM, Romozanova AM, Gabdoulkhakova AG, Filina YV, Shavaliyev RF, Rizvanov AA, Miftakhova RR. Biology of the SARS-CoV-2 Coronavirus. Biochemistry (Mosc) 2022; 87:1662-1678. [PMID: 36717455 PMCID: PMC9839213 DOI: 10.1134/s0006297922120215] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
Abstract
New coronavirus infection causing COVID-19, which was first reported in late 2019 in China, initiated severe social and economic crisis that affected the whole world. High frequency of the errors in replication of RNA viruses, zoonotic nature of transmission, and high transmissibility allowed betacoronaviruses to cause the third pandemic in the world since the beginning of 2003: SARS-CoV in 2003, MERS-CoV in 2012, and SARS-CoV-2 in 2019. The latest pandemic united scientific community and served as a powerful impetus in the study of biology of coronaviruses: new routes of virus penetration into the human cells were identified, features of the replication cycle were studied, and new functions of coronavirus proteins were elucidated. It should be recognized that the pandemic was accompanied by the need to obtain and publish results within a short time, which led to the emergence of an array of conflicting data and low reproducibility of research results. We systematized and analyzed scientific literature, filtered the results according to reliability of the methods of analysis used, and prepared a review describing molecular mechanisms of functioning of the SARS-CoV-2 coronavirus. This review considers organization of the genome of the SARS-CoV-2 virus, mechanisms of its gene expression and entry of the virus into the cell, provides information on key mutations that characterize different variants of the virus, and their contribution to pathogenesis of the disease.
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Affiliation(s)
- Rimma N. Mingaleeva
- Federal State Autonomous Educational Institution of Higher Education “Kazan (Volga Region) Federal University”, 420008 Kazan, Russia
| | - Nigina A. Nigmatulina
- State Autonomous Public Health Institution “Republican Clinical Hospital”, Ministry of Health of the Republic of Tatarstan, 420064 Kazan, Russia
| | - Liliya M. Sharafetdinova
- Federal State Autonomous Educational Institution of Higher Education “Kazan (Volga Region) Federal University”, 420008 Kazan, Russia
| | - Albina M. Romozanova
- Federal State Autonomous Educational Institution of Higher Education “Kazan (Volga Region) Federal University”, 420008 Kazan, Russia
| | - Aida G. Gabdoulkhakova
- Federal State Autonomous Educational Institution of Higher Education “Kazan (Volga Region) Federal University”, 420008 Kazan, Russia
| | - Yuliya V. Filina
- Federal State Autonomous Educational Institution of Higher Education “Kazan (Volga Region) Federal University”, 420008 Kazan, Russia
| | - Rafael F. Shavaliyev
- State Autonomous Public Health Institution “Republican Clinical Hospital”, Ministry of Health of the Republic of Tatarstan, 420064 Kazan, Russia
| | - Albert A. Rizvanov
- Federal State Autonomous Educational Institution of Higher Education “Kazan (Volga Region) Federal University”, 420008 Kazan, Russia
| | - Regina R. Miftakhova
- Federal State Autonomous Educational Institution of Higher Education “Kazan (Volga Region) Federal University”, 420008 Kazan, Russia
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9
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Kim DV, Makarova AV, Miftakhova RR, Zharkov DO. Base Excision DNA Repair Deficient Cells: From Disease Models to Genotoxicity Sensors. Curr Pharm Des 2020; 25:298-312. [PMID: 31198112 DOI: 10.2174/1381612825666190319112930] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/13/2019] [Accepted: 03/13/2019] [Indexed: 12/29/2022]
Abstract
Base excision DNA repair (BER) is a vitally important pathway that protects the cell genome from many kinds of DNA damage, including oxidation, deamination, and hydrolysis. It involves several tightly coordinated steps, starting from damaged base excision and followed by nicking one DNA strand, incorporating an undamaged nucleotide, and DNA ligation. Deficiencies in BER are often embryonic lethal or cause morbid diseases such as cancer, neurodegeneration, or severe immune pathologies. Starting from the early 1980s, when the first mammalian cell lines lacking BER were produced by spontaneous mutagenesis, such lines have become a treasure trove of valuable information about the mechanisms of BER, often revealing unexpected connections with other cellular processes, such as antibody maturation or epigenetic demethylation. In addition, these cell lines have found an increasing use in genotoxicity testing, where they provide increased sensitivity and representativity to cell-based assay panels. In this review, we outline current knowledge about BER-deficient cell lines and their use.
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Affiliation(s)
- Daria V Kim
- Novosibirsk State University, 2 Pirogova St., Novosibirsk 630090, Russian Federation
| | - Alena V Makarova
- RAS Institute of Molecular Genetics, 2 Kurchatova Sq., Moscow 123182, Russian Federation
| | - Regina R Miftakhova
- Kazan Federal University, 18 Kremlevsakaya St., Kazan 420008, Russian Federation
| | - Dmitry O Zharkov
- Novosibirsk State University, 2 Pirogova St., Novosibirsk 630090, Russian Federation.,SB RAS Institute of Chemical Biology and Fu ndamental Medicine, 8 Lavrentieva Ave., Novosibirsk 630090, Russian Federation
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10
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Dhiman G, Srivastava N, Goyal M, Rakha E, Lothion-Roy J, Mongan NP, Miftakhova RR, Khaiboullina SF, Rizvanov AA, Baranwal M. Metadherin: A Therapeutic Target in Multiple Cancers. Front Oncol 2019; 9:349. [PMID: 31131259 PMCID: PMC6509227 DOI: 10.3389/fonc.2019.00349] [Citation(s) in RCA: 46] [Impact Index Per Article: 9.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/26/2019] [Accepted: 04/15/2019] [Indexed: 12/24/2022] Open
Abstract
Altered expression of many genes and proteins is essential for cancer development and progression. Recently, the affected expression of metadherin (MTDH), also known as AEG-1 (Astrocyte Elevated Gene 1) and Lyric, has been implicated in various aspects of cancer progression and metastasis. Elevated expression of MTDH/AEG-1 has been reported in many cancers including breast, prostate, liver, and esophageal cancers, whereas its expression is low or absent in non-malignant tissues. These expression studies suggest that MTDH may represent a potential tumor associated antigen. MTDH also regulates multiple signaling pathways including PI3K/Akt, NF-κB, Wnt/β-catenin, and MAPK which cooperate to promote the tumorigenic and metastatic potential of transformed cells. Several microRNA have also been found to be associated with the increased MTDH expression in different cancers. Increased MTDH levels were linked to the tumor chemoresistance making it an attractive novel therapeutic target. In this review, we summarize data on MTDH function in various cancers.
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Affiliation(s)
- Gourav Dhiman
- Department of Biotechnology, Thapar Institute of Engineering and Technology, Patiala, India
| | - Neha Srivastava
- Department of Biotechnology, Thapar Institute of Engineering and Technology, Patiala, India
| | - Mehendi Goyal
- Department of Biotechnology, Thapar Institute of Engineering and Technology, Patiala, India
| | - Emad Rakha
- Faculty of Medicine and Health Sciences, School of Medicine, University of Nottingham, Nottingham, United Kingdom
| | - Jennifer Lothion-Roy
- Faculty of Medicine and Health Sciences, School of Veterinary Medicine and Science, University of Nottingham, Nottingham, United Kingdom
| | - Nigel P Mongan
- Faculty of Medicine and Health Sciences, School of Veterinary Medicine and Science, University of Nottingham, Nottingham, United Kingdom
| | - Regina R Miftakhova
- Institute of Fundamental Medicine and Biology, Kazan Federal University, Kazan, Russia
| | - Svetlana F Khaiboullina
- Institute of Fundamental Medicine and Biology, Kazan Federal University, Kazan, Russia.,Department of Microbiology and Immunology, University of Nevada, Reno, NV, United States
| | - Albert A Rizvanov
- Institute of Fundamental Medicine and Biology, Kazan Federal University, Kazan, Russia
| | - Manoj Baranwal
- Department of Biotechnology, Thapar Institute of Engineering and Technology, Patiala, India
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11
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Gomzikova MO, Zhuravleva MN, Miftakhova RR, Arkhipova SS, Evtugin VG, Khaiboullina SF, Kiyasov AP, Persson JL, Mongan NP, Pestell RG, Rizvanov AA. Cytochalasin B-induced membrane vesicles convey angiogenic activity of parental cells. Oncotarget 2017; 8:70496-70507. [PMID: 29050297 PMCID: PMC5642572 DOI: 10.18632/oncotarget.19723] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/15/2017] [Accepted: 06/17/2017] [Indexed: 12/20/2022] Open
Abstract
Naturally occurring extracellular vesicles (EVs) play essential roles in intracellular communication and delivery of bioactive molecules. Therefore it has been suggested that EVs could be used for delivery of therapeutics. However, to date the therapeutic application of EVs has been limited by number of factors, including limited yield and full understanding of their biological activities. To address these issues, we analyzed the morphology, molecular composition, fusion capacity and biological activity of Cytochalasin B-induced membrane vesicles (CIMVs). The size of these vesicles was comparable to that of naturally occurring EVs. In addition, we have shown that CIMVs from human SH-SY5Y cells contain elevated levels of VEGF as compared to the parental cells, and stimulate angiogenesis in vitro and in vivo.
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Affiliation(s)
| | | | | | | | | | - Svetlana F Khaiboullina
- Kazan Federal University, Kazan, 420008, Russia.,Department of Microbiology and Immunology, University of Nevada, Reno, Nevada, 89557, USA
| | | | - Jenny L Persson
- Department of Translational Medicine, Lund University, 205 02 Malmö, and Department of Molecular Biology, 901 87 Umeå, Umeå University
| | - Nigel P Mongan
- Cancer Biology and Translational Research, School of Veterinary Medicine and Science, University of Nottingham, LE12 5RD, UK.,Department of Pharmacology, Weill Cornell Medicine, 1300 York Ave., New York, NY, 10065, USA
| | - Richard G Pestell
- Pennsylvania Cancer and Regenerative Medicine Research Center, Baruch S. Blumberg Institute, Pennsylvania Biotechnology Center, 100 East Lancaster Avenue, Suite, 222, Wynnewood, PA 19096. USA.,Lee Kong Chian School of Medicine, Nanyang Technological University, Singapore 637551, Singapore
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12
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Miftakhova RR, Rakhmatullina AR, Mingaleeva RN, Garanina EE, Khaiboullina SF, Rizvanov AA. The expression of pluripotency genes regulates properties of cancer stem cells in MCF-7 breast cancer model. J Clin Oncol 2017. [DOI: 10.1200/jco.2017.35.15_suppl.e23018] [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: 11/20/2022] Open
Abstract
e23018 Background: More than 1.6 million cases of breast cancer (BC) are diagnosed annually worldwide. Despite advances in diagnoses and treatment, BC remains the third leading cause of death in women. Metastases and chemotherapy resistance are the main factors contributing to BC mortality. The ability of tumor cells to overcome the drug-induced growth inhibition is now linked to a unique population of cancer initiating tumor cells, often referred as cancer stem cells (CSC). CSC represent a small fraction of tumor cells, therefore, currently used isolation protocols have a low yield and are poorly reproducible, hampering research on the role of these cells in cancer chemoresistance. We propose a novel approach to generate large quantities of CSC-like cells by genetic reprogramming of non-stem cancer cells. Methods: We postulate that CSC-enriched cell line can be developed in vitro by upregulating of proteins controlling cancer cell pluripotency including Oct4, Sox2, NANOG, KLF4 and c-Myc. Increased transcriptional and translational activity of these genes in MCF-7 cells was demonstrated by real time-PCR and Western blot. Proliferation and migration of cells overexpressing Oct4, Sox2, NANOG, KLF4 and c-Myc were analyzed as well. Also, changes in CSC population counts and their sensitivity to chemotherapy were investigated using sphere formation assay. Results: We found that cell proliferation rate was correlated with the expression level of c-Myc and Oct4. Increased CSC counts were found in cells with overexpressed Oct4 (62.7%), KLF4 (97%) and NANOG (121.3%) proteins as compared to the parental cells. Overexpression of SOX2, NANOG and KLF4 significantly increased CSC resistance to docetaxel (83,3±6,8; 93,3±4,5 and 80,3±5,0 spheres respectively) when compared to the original cells (48,3±3,0 spheres). Conclusions: We conclude that overexpression of pluripotency proteins Oct4, Sox2, NANOG, KLF4 and c-Myc changes the CSC counts and proliferation capacity of BC cells. Acknowledgements: The study was funded by RFBR, according to the research project No. 16-34-60210 mol_а_dk, and by Russian Government Program of Competitive Growth of Kazan Federal University.
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Affiliation(s)
- Regina R. Miftakhova
- Institute of Fundamental Medicine and Biology, Kazan Federal University, Kazan, Russian Federation
| | - Aigul R Rakhmatullina
- Institute of Fundamental Medicine and Biology, Kazan Federal University, Kazan, Russian Federation
| | - Rimma N. Mingaleeva
- Institute of Fundamental Medicine and Biology, Kazan Federal University, Kazan, Russian Federation
| | - Ekaterina E Garanina
- Institute of Fundamental Medicine and Biology, Kazan Federal University, Kazan, Russian Federation
| | - Svetlana F Khaiboullina
- Institute of Fundamental Medicine and Biology, Kazan Federal University, Kazan, Russian Federation
| | - Albert A Rizvanov
- Institute of Fundamental Medicine and Biology, Kazan Federal University, Kazan, Russian Federation
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13
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Miftakhova RR, Akhunzyanov A, Filina JV, Khaiboullina SF, Rizvanov AA. Antibiotics target MCF-7 breast cancer stem cells in hypoxic environment. J Clin Oncol 2017. [DOI: 10.1200/jco.2017.35.15_suppl.e14068] [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: 11/20/2022] Open
Abstract
e14068 Background: Deregulated cellular metabolism is characteristic for cancer cells which heavily rely on glycolysis to meet metabolic demands. Studies have shown that increased glucose metabolism promotes tumor cell survival through mechanisms related to mitochondrial activities. Recently, mitochondrial inhibitors have been proposed as a potential anticancer therapeutics. In 2015 Lamb et al. presented anti-cancer activity of several antibiotics targeting mitochondrial function. Interestingly, these drugs have the highest inhibitory effect on cancer stem cells (CSCs), a small population of cancer initiating cells. It is believed that tumor microenvironment plays significant role in maintaining CSC population. The hypoxia is a major feature of the tumor microenvironment contributing into CSC phenotype, tumorigenicity and metastasis. Therefore, we sought to determine the effect of five antibiotics targeting mitochondrial function on CSC survival in hypoxia conditions. Methods: MCF-7 cells were cultured in normoxic (20% O2) and hypoxic (4% O2) conditions for 14 days in a presence of azithromycin, doxycycline, tetracycline, erythromycin and chloramphenicol. The ability to form mammospheres was used to determine CSC survival. Results: Incubation of CSCs with erythromycin, doxycycline, tetracycline and chloramphenicol reduced the number of mammospheres, the decrease in mammosphere number was comparable for MCF-7 cells incubated under normoxic and hypoxic conditions [erythromycin (62.5 % ± 10.8% vs. 58.9% ± 2.2% ), doxycycline (75.2% ± 5.9% vs. 68.5% ± 5.4% ), tetracycline (56.0% ± 3.2% vs. 65.0% ± 15.0%) and chloramphenicol (71.5% ± 6.7% vs. 73.7% ± 5.5%)]. Interestingly, azithromycin did not show inhibiting activity on sphere formation under hypoxic condition, while number of spheres was reduced in normoxic conditions Conclusions: These data indicate that four out of five antibiotics in our study can be potentially applied for targeted eradication of breast CSCs in hypoxiс conditions. Acknowledgements: The study was funded by RFBR, according to the research project No. 16-34-60210 mol_а_dk, and by Russian Government Program of Competitive Growth of Kazan Federal University.
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Affiliation(s)
- Regina R. Miftakhova
- Institute of Fundamental Medicine and Biology, Kazan Federal University, Kazan, Russian Federation
| | | | | | | | - Albert A Rizvanov
- Institute of Fundamental Medicine and Biology, Kazan Federal University, Kazan, Russian Federation
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14
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Metzler VM, de Brot S, Robinson RS, Jeyapalan JN, Rakha E, Walton T, Gardner DS, Lund EF, Whitchurch J, Haigh D, Lochray JM, Robinson BD, Allegrucci C, Fray RG, Persson JL, Ødum N, Miftakhova RR, Rizvanov AA, Hughes IA, Tadokoro-Cuccaro R, Heery DM, Rutland CS, Mongan NP. Androgen dependent mechanisms of pro-angiogenic networks in placental and tumor development. Placenta 2017; 56:79-85. [PMID: 28238455 DOI: 10.1016/j.placenta.2017.02.018] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/14/2016] [Revised: 02/14/2017] [Accepted: 02/15/2017] [Indexed: 11/25/2022]
Abstract
The placenta and tumors share important characteristics, including a requirement to establish effective angiogenesis. In the case of the placenta, optimal angiogenesis is required to sustain the blood flow required to maintain a successful pregnancy, whereas in tumors establishing new blood supplies is considered a key step in supporting metastases. Therefore the development of novel angiogenesis inhibitors has been an area of active research in oncology. A subset of the molecular processes regulating angiogenesis are well understood in the context of both early placentation and tumorigenesis. In this review we focus on the well-established role of androgen regulation of angiogenesis in cancer and relate these mechanisms to placental angiogenesis. The physiological actions of androgens are mediated by the androgen receptor (AR), a ligand dependent transcription factor. Androgens and the AR are essential for normal male embryonic development, puberty and lifelong health. Defects in androgen signalling are associated with a diverse range of clinical disorders in men and women including disorders of sex development (DSD), polycystic ovary syndrome in women and many cancers. We summarize the diverse molecular mechanisms of androgen regulation of angiogenesis and infer the potential significance of these pathways to normal and pathogenic placental function. Finally, we offer potential research applications of androgen-targeting molecules developed to treat cancer as investigative tools to help further delineate the role of androgen signalling in placental function and maternal and offspring health in animal models.
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Affiliation(s)
- Veronika M Metzler
- Faculty of Medicine and Health Sciences, School of Veterinary Medicine and Health Sciences, University of Nottingham, LE12 5RD, UK
| | - Simone de Brot
- Faculty of Medicine and Health Sciences, School of Veterinary Medicine and Health Sciences, University of Nottingham, LE12 5RD, UK
| | - Robert S Robinson
- Faculty of Medicine and Health Sciences, School of Veterinary Medicine and Health Sciences, University of Nottingham, LE12 5RD, UK
| | - Jennie N Jeyapalan
- Faculty of Medicine and Health Sciences, School of Veterinary Medicine and Health Sciences, University of Nottingham, LE12 5RD, UK
| | - Emad Rakha
- School of Medicine and Sciences, University of Nottingham, Nottingham City Hospital, NG5 1PB, UK
| | - Thomas Walton
- Department of Urology, Nottingham University Hospitals NHS Trust, NG5 1PB, UK
| | - David S Gardner
- Faculty of Medicine and Health Sciences, School of Veterinary Medicine and Health Sciences, University of Nottingham, LE12 5RD, UK
| | - Emma F Lund
- Faculty of Medicine and Health Sciences, School of Veterinary Medicine and Health Sciences, University of Nottingham, LE12 5RD, UK
| | | | - Daisy Haigh
- Faculty of Medicine and Health Sciences, School of Veterinary Medicine and Health Sciences, University of Nottingham, LE12 5RD, UK
| | - Jack M Lochray
- Faculty of Medicine and Health Sciences, School of Veterinary Medicine and Health Sciences, University of Nottingham, LE12 5RD, UK
| | - Brian D Robinson
- Department of Pathology, Weill Cornell Medicine, New York 10065, USA
| | - Cinzia Allegrucci
- Faculty of Medicine and Health Sciences, School of Veterinary Medicine and Health Sciences, University of Nottingham, LE12 5RD, UK
| | - Rupert G Fray
- School of Biosciences, University of Nottingham, LE12 5RD, UK
| | - Jenny L Persson
- Department of Translational Medicine, Lund University, Malmö, Sweden; Department of Molecular Biology, Umeå University, Sweden
| | - Niels Ødum
- Department of Immunology and Microbiology, University of Copenhagen, Denmark
| | - Regina R Miftakhova
- Department of Molecular Biology, Umeå University, Sweden; Kazan Federal University, Kazan, Republic of Tatarstan 420008, Russian Federation
| | - Albert A Rizvanov
- Kazan Federal University, Kazan, Republic of Tatarstan 420008, Russian Federation
| | - Ieuan A Hughes
- Department of Paediatrics, University of Cambridge, Hills Rd, Cambridge CB2 0QQ, UK
| | | | - David M Heery
- School of Pharmacy, University of Nottingham, NG7 2TQ, UK
| | - Catrin S Rutland
- Faculty of Medicine and Health Sciences, School of Veterinary Medicine and Health Sciences, University of Nottingham, LE12 5RD, UK.
| | - Nigel P Mongan
- Faculty of Medicine and Health Sciences, School of Veterinary Medicine and Health Sciences, University of Nottingham, LE12 5RD, UK; Department of Pharmacology, Weill Cornell Medicine, New York 10065, USA.
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15
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Abstract
Cells within the tumor are highly heterogeneous. Only a small portion of the cells within the tumor is capable to generate a new tumor. These cells are called cancer stem cells. Theoretically, cancer stem cells are originally from normal stem cells or early progenitor cells which accumulate the random mutations and undergo an altered version of the normal differentiation process. The cancer stem cell drives tumor progression and its recurrence. Thus, the technique to identify and purify the cancer stem cell is the key in any cancer stem cell research. In this protocol, we provide the basic technology of identification and purification of breast cancer stem cells as well as further functional assays to help the researchers achieve their research goals.
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Affiliation(s)
- Xuanmao Jiao
- Department of Cancer Biology, Sidney Kimmel Cancer Center, Thomas Jefferson University, Bluemle Life Sciences Building, 233 South 10th Street, Philadelphia, PA, 19107, USA
| | - Albert A Rizvanov
- Kazan Federal University, 18 Kremlyovskaya St, Kazan, Republic of Tatarstan, 420008, Russia
| | - Massimo Cristofanilli
- Department of Cancer Biology, Sidney Kimmel Cancer Center, Thomas Jefferson University, Bluemle Life Sciences Building, 233 South 10th Street, Philadelphia, PA, 19107, USA
| | - Regina R Miftakhova
- Kazan Federal University, 18 Kremlyovskaya St, Kazan, Republic of Tatarstan, 420008, Russia
| | - Richard G Pestell
- Department of Cancer Biology, Sidney Kimmel Cancer Center, Thomas Jefferson University, Bluemle Life Sciences Building, 233 South 10th Street, Philadelphia, PA, 19107, USA.
- Kazan Federal University, 18 Kremlyovskaya St, Kazan, Republic of Tatarstan, 420008, Russia.
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16
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Arleevskaya MI, Gabdoulkhakova AG, Filina YV, Miftakhova RR, Bredberg A, Tsybulkin AP. A transient peak of infections during onset of rheumatoid arthritis: a 10-year prospective cohort study. BMJ Open 2014; 4:e005254. [PMID: 25180052 PMCID: PMC4156809 DOI: 10.1136/bmjopen-2014-005254] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/18/2022] Open
Abstract
OBJECTIVES The role of infection in rheumatoid arthritis (RA) has not been determined. We aimed to document the infectious burden and some aspects of antibacterial immunity in a large and prospective cohort study of RA patients in the early and late stages of the disease and in their relatives predisposed to RA. SETTING Clinical and laboratory examination of all individuals enrolled in the study was performed in the Republican Clinical Hospital, Kazan, Russia. PARTICIPANTS 376 patients with RA, 251 healthy first-degree relatives and 227 healthy controls without a family history of autoimmune disease (all females) were examined twice annually over more than 10 years. PRIMARY AND SECONDARY OUTCOME MEASURES The following parameters were investigated: type, duration and frequency of infections, bacterial colonisation and serum levels of IgG to bacteria, serum levels of total Ig, plasma cytokine levels, granulocyte reactive oxygen species production, lysozyme activity and phagocytosis. RESULTS There were no significant differences in infection rate between healthy controls (median 14 days/year) and RA patients (13). However, infection rates were higher (p<0.001) in healthy relatives (53) and early stage patients (62), which groups also showed heavy bacterial skin colonisation. In contrast, late stage patients had fewer infection days (12; p<0.001) than healthy controls, although bacterial colonisation was still heavy. Phagocyte function and antibacterial antibody generation, together with compensatory cytokine production, were observed to be subnormal in the healthy relatives as well as in RA patients. CONCLUSIONS We observed a marked increase in overall infections at the time of RA onset, and signs of a defective antibacterial defence mechanism, contrasting with fewer infections in the late RA stage. It can be speculated that frequent early infections initiate a compensatory immune hyper-reactivity which reduces the infection load while stimulating the development of RA in predisposed individuals.
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Affiliation(s)
| | | | - Yulia V Filina
- Central Research Laboratory, Kazan State Medical Academy, Kazan, Russia
| | - Regina R Miftakhova
- Department of Laboratory Medicine, Lund University, Skane University Hospital, Malmo, Sweden
| | - Anders Bredberg
- Department of Laboratory Medicine, Lund University, Skane University Hospital, Malmo, Sweden
| | - Anatoly P Tsybulkin
- Department of the Clinical Laboratory Diagnostic, Kazan State Medical Academy, Kazan, Russia
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