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Choporova Y.Y.,Novosibirsk State University | Cherkassky V.S.,Novosibirsk State University | Grigorieva E.V.,Institute of Molecular Biology and Biophysics SD RAMS | Knyazev B.A.,Novosibirsk State University | And 2 more authors.
International Conference on Infrared, Millimeter, and Terahertz Waves, IRMMW-THz | Year: 2013

A circular dichroism polarimeter (CDP) with an attenuated total reflection element for study of strongly absorbing substances and NovoFEL as a monochromatic source of THz radiation has been developed. Polarimetric characteristics of polysaccharide enantiomers have been studied for the device performance testing. © 2013 IEEE. Source


Prudnikova T.Y.,Institute of Molecular Biology and Biophysics SD RAMS | Soulitzis N.,University of Crete | Kutsenko O.S.,Institute of Molecular Biology and Biophysics SD RAMS | Mostovich L.A.,Karolinska Institutet | And 6 more authors.
Cancer Medicine | Year: 2013

Heparansulfate proteoglycans (HSPG) play an important role in cell-cell and cell-matrix interactions and signaling, and one of the key enzymes in heparansulfate biosynthesis is d-glucuronyl C5-epimerase (GLCE). A tumor suppressor function has been demonstrated for GLCE in breast and lung carcinogenesis; however, no data are available as to the expression and regulation of the gene in prostate cancer. In this study, decreased GLCE expression was observed in 10% of benign prostate hyperplasia (BPH) tissues and 53% of prostate tumors, and increased GLCE mRNA levels were detected in 49% of BPH tissues and 21% of tumors. Statistical analysis showed a positive correlation between increased GLCE expression and Gleason score, TNM staging, and prostate-specific antigen (PSA) level in the prostate tumors (Pearson correlation coefficients GLCE/Gleason = 0.56, P < 0.05; GLCE/TNM = 0.62, P < 0.05; and GLCE/PSA = 0.88, P < 0.01), suggesting GLCE as a candidate molecular marker for advanced prostate cancer. Immunohistochemical analysis revealed an intratumoral heterogeneity of GLCE protein levels both in BPH and prostate cancer cells, resulting in a mixed population of GLCE-expressing and nonexpressing epithelial cells in vivo. A model experiment on normal (PNT2) and prostate cancer (LNCaP, PC3, DU145) cell lines in vitro showed a 1.5- to 2.5-fold difference in GLCE expression levels between the cancer cell lines and an overall decrease in GLCE expression in cancer cells. Methyl-specific polymerase chain reaction (PCR), bisulfite sequencing, and deoxy-azacytidin (aza-dC) treatment identified differential GLCE promoter methylation (LNCaP 70-72%, PC3 32-35%, DU145, and PNT2 no methylation), which seems to contribute to heterogeneous GLCE expression in prostate tumors. The obtained results reveal the complex deregulation of GLCE expression in prostatic diseases compared with normal prostate tissue and suggest that GLCE may be used as a potential model to study the functional role of intratumor cell heterogeneity in prostate cancer progression. © 2013 The Authors. Source


Suhovskih A.V.,Novosibirsk State University | Tsidulko A.Y.,Institute of Molecular Biology and Biophysics SD RAMS | Kutsenko O.S.,Institute of Molecular Biology and Biophysics SD RAMS | Aidagulova S.V.,Novosibirsk State Medical University | And 2 more authors.
Frontiers in Oncology | Year: 2014

Heparan sulfates (HSs) are key components of mammalian cells surface and extracellular matrix. Structure and composition of HS, generated by HS-biosynthetic system through non-template-driven process, are significantly altered in cancer tissues. The aim of this study was to investigate the involvement of HS-metabolic machinery in prostate carcinogenesis. Transcriptional patterns of HS-metabolic enzymes (EXT1, EXT2, NDST1, NDST2, GLCE, 3OST1/HS3ST1, SULF1, SULF2, HPSE) were determined in normal, benign, and cancer human prostate tissues and cell lines (PNT2, LNCaP, PC3, DU145). Stability of the HS-metabolic system patterns under the pressure of external or internal stimuli was studied. Overall impairment of transcriptional activity of HS-metabolic machinery was detected in benign prostate hyperplasia, while both significant decrease in the transcriptional activity and changes in the expression patterns of HS metabolism-involved genes were observed in prostate tumors. Prostate cancer cell lines possessed specific transcriptional patterns of HS metabolism-involved genes; however, expression activity of the system was similar to that of normal prostate PNT2 cells. HS-metabolic system was able to dynamically react to different external or internal stimuli in a cell type-dependent manner. LNCaP cells were sensitive to the external stimuli (5-aza-deoxycytidin or Trichostatin A treatments; co-cultivation with human fibroblasts), whereas PC3 cells almost did not respond to the treatments. Ectopic GLCE over-expression resulted in transcriptional activation of HS-biosynthetic machinery in both cell lines, suggesting an existence of a self-regulating mechanism for the coordinated transcription of HS metabolism-involved genes. Taken together, these findings demonstrate impairment of HS-metabolic system in prostate tumors in vivo but not in prostate cancer cells in vitro, and suggest that as a potential microenvironmental biomarker for prostate cancer diagnostics and treatment. © 2014 Suhovskih, Tsidulko, Kutsenko, Kovner, Aidagulova, Ernberg and Grigorieva. Source


Mostovich L.A.,Institute of Molecular Biology and Biophysics SD RAMS | Prudnikova T.Y.,Institute of Molecular Biology and Biophysics SD RAMS | Kondratov A.G.,NASU Institute of Molecular Biology and Genetics | Loginova D.,RAS Institute of Cytology and Genetics | And 9 more authors.
Cell Adhesion and Migration | Year: 2011

Integrin alpha9 (ITGA9) is one of the less studied integrin subunits that facilitates accelerated cell migration and regulates diverse biological functions such as angiogenesis, lymphangiogenesis, cancer cell proliferation and migration. In this work, integrin alpha9 expression and its epigenetic regulation in normal human breast tissue, primary breast tumors and breast cancer cell line MCF7 were studied. It was shown that integrin alpha9 is expressed in normal human breast tissue. In breast cancer, ITGA9 expression was downregulated or lost in 44% of tumors while another 45% of tumors showed normal or increased ITGA9 expression level (possible aberrations in the ITGA9 mRNA structure were supposed in 11% of tumors). Methylation of ITGA9 CpG-island located in the first intron of the gene was shown in 90% of the breast tumors with the decreased ITGA9 expression while no methylation at 5'-untranslated region of ITGA9 was observed. 5-aza-dC treatment restored integrin alpha9 expression in ITGA9-negative MCF7 breast carcinoma cells, Trichostatin A treatment did not influenced it but a combined treatment of the cells with 5-aza-dC/Trichostatin A doubled the ITGA9 activation. The obtained results suggest CpG methylation as a major mechanism of integrin alpha9 inactivation in breast cancer with a possible involvement of other yet unidentified molecular pathways. © 2011 Landes Bioscience. Source


Suhovskih A.V.,Novosibirsk State University | Domanitskaya N.V.,Institute of Molecular Biology and Biophysics SD RAMS | Tsidulko A.Y.,Institute of Molecular Biology and Biophysics SD RAMS | Prudnikova T.Y.,Institute of Molecular Biology and Biophysics SD RAMS | And 2 more authors.
Cell Adhesion and Migration | Year: 2015

Heparan sulfate (HS) proteoglycans are key components of cell microenvironment and fine structure of their polysaccharide HS chains plays an important role in cell-cell interactions, adhesion, migration and signaling. It is formed on non-template basis, so, structure and functional activity of HS biosynthetic machinery is crucial for correct HS biosynthesis and post-synthetic modification. To reveal cancer-related changes in transcriptional pattern of HS biosynthetic system, the expression of HS metabolism-involved genes (EXT1/2, NDST1/2, GLCE, 3OST1/HS3ST1, SULF1/2, HPSE) in human normal (fibroblasts, PNT2) and cancer (MCF7, LNCaP, PC3, DU145, H157, H647, A549, U2020, U87, HT116, KRC/Y) cell lines and breast, prostate, colon tumors was studied. Real-time RT-PCR and Western-blot analyses revealed specific transcriptional patterns and expression levels of HS biosynthetic system both in different cell lines in vitro and cancers in vivo. Balance between transcriptional activities of elongation-and post-synthetic modificationinvolved genes was suggested as most informative parameter for HS biosynthetic machinery characterization. Normal human fibroblasts showed elongation-oriented HS biosynthesis, while PNT2 prostate epithelial cells had modificationoriented one. However, cancer epithelial cells demonstrated common tendency to acquire fibroblast-like elongationoriented mode of HS biosynthetic system. Surprisingly, aggressive metastatic cancer cells (U2020, DU145, KRC/Y) retained modification-oriented HS biosynthesis similar to normal PNT2 cells, possibly enabling the cells to keep like-tonormal cell surface glycosylation pattern to escape antimetastatic control. The obtained results show the cell typespecific changes of HS-biosynthetic machinery in cancer cells in vitro and tissue-specific changes in different cancers in vivo, supporting a close involvement of HS biosynthetic system in carcinogenesis. © 2015 Taylor & Francis Group, LLC. Source

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