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Raguraman R, Bhavsar D, Kim D, Ren X, Sikavitsas V, Munshi A, Ramesh R. Tumor-targeted exosomes for delivery of anticancer drugs. Cancer Lett 2023; 558:216093. [PMID: 36822543 PMCID: PMC10025995 DOI: 10.1016/j.canlet.2023.216093] [Citation(s) in RCA: 8] [Impact Index Per Article: 8.0] [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: 01/18/2023] [Revised: 02/07/2023] [Accepted: 02/10/2023] [Indexed: 02/23/2023]
Abstract
Exosomes are small phospholipid bilayer vesicles that are naturally produced by all living cells, both prokaryotes and eukaryotes. The exosomes due to their unique size, reduced immunogenicity, and their ability to mimic synthetic liposomes in carrying various anticancer drugs have been tested as drug delivery vehicles for cancer treatment. An added advantage of developing exosomes as a drug carrier is the ease of manipulating their intraluminal content and their surface modification to achieve tumor-targeted drug delivery. In the past ten-years, there has been an exponential increase in the number of exosome-related studies in cancer. Preclinical studies demonstrate exosomes-mediated delivery of chemotherapeutics, biologicals and natural products produce potent anticancer activity both, in vitro and in vivo. In contrast, the number of exosome-based clinical trials are few due to challenges in the manufacturing and scalability related to large-scale production of exosomes and their storage and stability. Herein, we discuss recent advances in exosome-based drug delivery for cancer treatment in preclinical and clinical studies and conclude with challenges to be overcome for translating a larger number of exosome-based therapies into the clinic.
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Affiliation(s)
- Rajeswari Raguraman
- Department of Pathology, The University of Oklahoma Health Sciences Center, Oklahoma City, OK, 73104, USA; OU Health Stephenson Cancer Center, The University of Oklahoma Health Sciences Center, Oklahoma City, OK, 73104, USA
| | - Dhaval Bhavsar
- Department of Pathology, The University of Oklahoma Health Sciences Center, Oklahoma City, OK, 73104, USA; OU Health Stephenson Cancer Center, The University of Oklahoma Health Sciences Center, Oklahoma City, OK, 73104, USA
| | - Dongin Kim
- Department of Pharmaceutical Sciences, The University of Oklahoma Health Sciences Center, Oklahoma City, OK, 73104, USA; OU Health Stephenson Cancer Center, The University of Oklahoma Health Sciences Center, Oklahoma City, OK, 73104, USA
| | - Xiaoyu Ren
- Department of Pharmaceutical Sciences, The University of Oklahoma Health Sciences Center, Oklahoma City, OK, 73104, USA
| | - Vassilios Sikavitsas
- School of Chemical, Biological and Material Engineering, The University of Oklahoma, Norman, Oklahoma, 73019, USA; OU Health Stephenson Cancer Center, The University of Oklahoma Health Sciences Center, Oklahoma City, OK, 73104, USA
| | - Anupama Munshi
- Department of Radiation Oncology, The University of Oklahoma Health Sciences Center, Oklahoma City, OK, 73104, USA; OU Health Stephenson Cancer Center, The University of Oklahoma Health Sciences Center, Oklahoma City, OK, 73104, USA
| | - Rajagopal Ramesh
- Department of Pathology, The University of Oklahoma Health Sciences Center, Oklahoma City, OK, 73104, USA; OU Health Stephenson Cancer Center, The University of Oklahoma Health Sciences Center, Oklahoma City, OK, 73104, USA; Graduate Program in Biomedical Sciences, The University of Oklahoma Health Sciences Center, Oklahoma City, OK, 73104, USA.
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Mehta M, Raguraman R, Ramesh R, Munshi A. RNA binding proteins (RBPs) and their role in DNA damage and radiation response in cancer. Adv Drug Deliv Rev 2022; 191:114569. [PMID: 36252617 PMCID: PMC10411638 DOI: 10.1016/j.addr.2022.114569] [Citation(s) in RCA: 14] [Impact Index Per Article: 7.0] [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: 05/24/2022] [Revised: 09/27/2022] [Accepted: 09/29/2022] [Indexed: 01/24/2023]
Abstract
Traditionally majority of eukaryotic gene expression is influenced by transcriptional and post-transcriptional events. Alterations in the expression of proteins that act post-transcriptionally can affect cellular signaling and homeostasis. RNA binding proteins (RBPs) are a family of proteins that specifically bind to RNAs and are involved in post-transcriptional regulation of gene expression and important cellular processes such as cell differentiation and metabolism. Deregulation of RNA-RBP interactions and any changes in RBP expression or function can lead to various diseases including cancer. In cancer cells, RBPs play an important role in regulating the expression of tumor suppressors and oncoproteins involved in various cell-signaling pathways. Several RBPs such as HuR, AUF1, RBM38, LIN28, RBM24, tristetrapolin family and Musashi play critical roles in various types of cancers and their aberrant expression in cancer cells makes them an attractive therapeutic target for cancer treatment. In this review we provide an overview of i). RBPs involved in cancer progression and their mechanism of action ii). the role of RBPs, including HuR, in breast cancer progression and DNA damage response and iii). explore RBPs with emphasis on HuR as therapeutic target for breast cancer therapy.
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Affiliation(s)
- Meghna Mehta
- Department of Radiation Oncology, The University of Oklahoma Health Sciences Center, Oklahoma City, OK 73013, USA; Stephenson Cancer Center, The University of Oklahoma Health Sciences Center, Oklahoma City, OK 73013, USA
| | - Rajeswari Raguraman
- Department of Pathology, The University of Oklahoma Health Sciences Center, Oklahoma City, OK 73013, USA; Stephenson Cancer Center, The University of Oklahoma Health Sciences Center, Oklahoma City, OK 73013, USA
| | - Rajagopal Ramesh
- Department of Pathology, The University of Oklahoma Health Sciences Center, Oklahoma City, OK 73013, USA; Stephenson Cancer Center, The University of Oklahoma Health Sciences Center, Oklahoma City, OK 73013, USA
| | - Anupama Munshi
- Department of Radiation Oncology, The University of Oklahoma Health Sciences Center, Oklahoma City, OK 73013, USA; Stephenson Cancer Center, The University of Oklahoma Health Sciences Center, Oklahoma City, OK 73013, USA.
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Raguraman R, Shanmugarama S, Mehta M, Elle Peterson J, Zhao YD, Munshi A, Ramesh R. Drug delivery approaches for HuR-targeted therapy for lung cancer. Adv Drug Deliv Rev 2022; 180:114068. [PMID: 34822926 PMCID: PMC8724414 DOI: 10.1016/j.addr.2021.114068] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [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: 10/17/2021] [Accepted: 11/18/2021] [Indexed: 01/03/2023]
Abstract
Lung cancer (LC) is often diagnosed at an advanced stage and conventional treatments for disease management have limitations associated with them. Novel therapeutic targets are thus avidly sought for the effective management of LC. RNA binding proteins (RBPs) have been convincingly established as key players in tumorigenesis, and their dysregulation is linked to multiple cancers, including LC. In this context, we review the role of Human antigen R (HuR), an RBP that is overexpressed in LC, and further associated with various aspects of LC tumor growth and response to therapy. Herein, we describe the role of HuR in LC progression and outline the evidences supporting various pharmacologic and biologic approaches for inhibiting HuR expression and function. These approaches, including use of small molecule inhibitors, siRNAs and shRNAs, have demonstrated favorable results in reducing tumor cell growth, invasion and migration, angiogenesis and metastasis. Hence, HuR has significant potential as a key therapeutic target in LC. Use of siRNA-based approaches, however, have certain limitations that prevent their maximal exploitation as cancer therapies. To address this, in the conclusion of this review, we provide a list of nanomedicine-based HuR targeting approaches currently being employed for siRNA and shRNA delivery, and provide a rationale for the immense potential therapeutic benefits offered by nanocarrier-based HuR targeting and its promise for treating patients with LC.
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Affiliation(s)
- Rajeswari Raguraman
- Department of Pathology, The University of Oklahoma Health Sciences Center, Oklahoma City, OK, USA; Stephenson Cancer Center, University of Oklahoma Health Sciences Center, Oklahoma City, OK, USA
| | - Santny Shanmugarama
- Department of Pathology, The University of Oklahoma Health Sciences Center, Oklahoma City, OK, USA; Graduate Program in Biomedical Sciences, University of Oklahoma Health Sciences Center, Oklahoma City, OK 73104, USA
| | - Meghna Mehta
- Radiation Oncology, The University of Oklahoma Health Sciences Center, Oklahoma City, OK, USA; Stephenson Cancer Center, University of Oklahoma Health Sciences Center, Oklahoma City, OK, USA
| | - Jo Elle Peterson
- Department of Pathology, The University of Oklahoma Health Sciences Center, Oklahoma City, OK, USA
| | - Yan D Zhao
- Biostatistics and Epidemiology, The University of Oklahoma Health Sciences Center, Oklahoma City, OK, USA; Stephenson Cancer Center, University of Oklahoma Health Sciences Center, Oklahoma City, OK, USA
| | - Anupama Munshi
- Radiation Oncology, The University of Oklahoma Health Sciences Center, Oklahoma City, OK, USA; Stephenson Cancer Center, University of Oklahoma Health Sciences Center, Oklahoma City, OK, USA
| | - Rajagopal Ramesh
- Department of Pathology, The University of Oklahoma Health Sciences Center, Oklahoma City, OK, USA; Stephenson Cancer Center, University of Oklahoma Health Sciences Center, Oklahoma City, OK, USA; Graduate Program in Biomedical Sciences, University of Oklahoma Health Sciences Center, Oklahoma City, OK 73104, USA.
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Revikumar A, Kashyap V, Palollathil A, Aravind A, Raguraman R, Kumar KMK, Vijayakumar M, Prasad TSK, Raju R. Multiple G-quadruplex binding ligand induced transcriptomic map of cancer cell lines. J Cell Commun Signal 2021; 16:129-135. [PMID: 34309794 DOI: 10.1007/s12079-021-00637-z] [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: 07/08/2021] [Accepted: 07/13/2021] [Indexed: 10/20/2022] Open
Abstract
The G-quadruplexes (G4s) are a class of DNA secondary structures with guanine rich DNA sequences that can fold into four stranded non-canonical structures. At the genomic level, their pivotal role is well established in DNA replication, telomerase functions, constitution of topologically associating domains, and the regulation of gene expression. Genome instability mediated by altered G4 formation and assembly has been associated with multiple disorders including cancers and neurodegenerative disorders. Multiple tools have also been developed to predict the potential G4 regions in genomes and the whole genome G4 maps are also being derived through sequencing approaches. Enrichment of G4s in the cis-regulatory elements of genes associated with tumorigenesis has accelerated the quest for identification of G4-DNA binding ligands (G4DBLs) that can selectively bind and regulate the expression of such specific genes. In this context, the analysis of G4DBL responsive transcriptome in diverse cancer cell lines is inevitable for assessment of the specificity of novel G4DBLs. Towards this, we assembled the transcripts differentially regulated by different G4DBLs and have also identified a core set of genes regulated in diverse cancer cell lines in response to 3 or more of these ligands. With the mode of action of G4DBLs towards topology shifts, folding, or disruption of G4 structure being currently visualized, we believe that this dataset will serve as a platform for assembly of G4DBL responsive transcriptome for comparative analysis of G4DBLs in multiple cancer cells based on the expression of specific cis-regulatory G4 associated genes in the future.
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Affiliation(s)
- Amjesh Revikumar
- Cancer Research Program, Rajiv Gandhi Centre for Biotechnology, Thiruvananthapuram, 695014, India.
| | - Vivek Kashyap
- Center for Systems Biology and Molecular Medicine, Yenepoya Research Centre, Yenepoya (Deemed To Be University), Mangalore, 575018, India
| | - Akhina Palollathil
- Center for Systems Biology and Molecular Medicine, Yenepoya Research Centre, Yenepoya (Deemed To Be University), Mangalore, 575018, India
| | - Anjana Aravind
- Center for Systems Biology and Molecular Medicine, Yenepoya Research Centre, Yenepoya (Deemed To Be University), Mangalore, 575018, India
| | - Rajeswari Raguraman
- Cancer Research Program, Rajiv Gandhi Centre for Biotechnology, Thiruvananthapuram, 695014, India.,Health Science Centre, University of Oklahoma, Oklahoma City, USA
| | | | - Manavalan Vijayakumar
- Department of Surgical Oncology, Yenepoya Medical College, Yenepoya (Deemed to Be University), Mangalore, 575018, India
| | | | - Rajesh Raju
- Cancer Research Program, Rajiv Gandhi Centre for Biotechnology, Thiruvananthapuram, 695014, India. .,Center for Systems Biology and Molecular Medicine, Yenepoya Research Centre, Yenepoya (Deemed To Be University), Mangalore, 575018, India.
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Raguraman R, Parameswaran S, Kanwar JR, Vasudevan M, Chitipothu S, Kanwar RK, Krishnakumar S. Gene expression profiling of tumor stroma interactions in retinoblastoma. Exp Eye Res 2020; 197:108067. [PMID: 32585195 DOI: 10.1016/j.exer.2020.108067] [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: 06/27/2019] [Revised: 04/23/2020] [Accepted: 05/08/2020] [Indexed: 01/18/2023]
Abstract
We aimed to identify the critical molecular pathways altered upon tumor stroma interactions in retinoblastoma (RB). In vitro 2 D cocultures of RB tumor cells (Weri-Rb-1 and NCC-RbC-51) with primary bone marrow stromal cells (BMSC) was established. Global gene expression patterns in coculture samples were assessed using Affymetrix Prime view human gene chip microarray and followed with bioinformatics analyses. Key upregulated genes from Weri-Rb-1 + BMSC and NCC-RbC-51 + BMSC coculture were validated using qRT-PCR to ascertain their role in RB progression. Whole genome microarray experiments identified significant (P ≤ 0.05, 1.1 log 2 FC) transcriptome level changes induced upon coculture of RB cells with BMSC. A total of 1155 genes were downregulated and 1083 upregulated in Weri-Rb-1 + BMSC coculture. Similarly, 1865 genes showed downregulation and 1644 genes were upregulation in NCC-RbC-51 + BMSC coculture. The upregulated genes were significantly associated with pathways of focal adhesion, PI3K-Akt signalling, ECM-receptor interaction, JAK-STAT, TGF-β signalling thus contributing to RB progression. Validation of key genes by qRT-PCR revealed significant overexpression of IL8, IL6, MYC and SMAD3 in the case of Weri-Rb-1 + BMSC coculture and IL6 in the case of NCC-RbC-51 + BMSC coculture. The microarray expression study on in vitro RB coculture models revealed the pathways that could be involved in the progression of RB. The gene signature obtained in a stimulated model when a growing tumor interacts with its microenvironment may provide new horizons for potential targeted therapy in RB.
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Affiliation(s)
- Rajeswari Raguraman
- Larsen & Toubro Department of Ocular Pathology, Vision Research Foundation, Kamalnayan Bajaj Institute for Research in Vision and Ophthalmology, Chennai, 600006, Tamil Nadu, India; School of Medicine, Institute for Innovation in Mental and Physical Health and Clinical Translation (IMPACT), Deakin University, Geelong, 3216, VIC, Australia
| | - Sowmya Parameswaran
- Radheshyam Kanoi Stem Cell Laboratory, Vision Research Foundation, Kamalnayan Bajaj Institute for Research in Vision and Ophthalmology, Chennai, 600006, Tamil Nadu, India
| | - Jagat Rakesh Kanwar
- School of Medicine, Institute for Innovation in Mental and Physical Health and Clinical Translation (IMPACT), Deakin University, Geelong, 3216, VIC, Australia
| | | | - Srujana Chitipothu
- Central Research Instrumentation Facility, Vision Research Foundation, Kamalnayan Bajaj Institute for Research in Vision and Ophthalmology, Chennai, 600006, Tamil Nadu, India
| | - Rupinder Kaur Kanwar
- School of Medicine, Institute for Innovation in Mental and Physical Health and Clinical Translation (IMPACT), Deakin University, Geelong, 3216, VIC, Australia
| | - Subramanian Krishnakumar
- Larsen & Toubro Department of Ocular Pathology, Vision Research Foundation, Kamalnayan Bajaj Institute for Research in Vision and Ophthalmology, Chennai, 600006, Tamil Nadu, India; School of Medicine, Institute for Innovation in Mental and Physical Health and Clinical Translation (IMPACT), Deakin University, Geelong, 3216, VIC, Australia.
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Raguraman R, Parameswaran S, Kanwar JR, Khetan V, Rishi P, Kanwar RK, Krishnakumar S. Evidence of Tumour Microenvironment and Stromal Cellular Components in Retinoblastoma. Ocul Oncol Pathol 2018; 5:85-93. [PMID: 30976585 DOI: 10.1159/000488709] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [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: 12/08/2017] [Revised: 03/19/2018] [Indexed: 12/21/2022] Open
Abstract
Background The tumour microenvironment (TME) consisting of tumour cells and multiple stromal cell types regulate tumour growth, invasion and metastasis. While the concept of TME and presence of stromal cellular components is widely established in cancers, its significance in the paediatric intraocular malignancy, retinoblastoma (RB), remains unknown. Methods The study qualitatively identified the presence of multiple stromal cellular subtypes in RB TME by immunohistochemistry. Results Results of the study identified the presence of stromal cell types such as endothelial cells, tumour-associated macrophages, fibroblasts, cancer-associated fibroblasts, retinal astrocytes and glia in RB TME. The extent of stromal marker positivity, however, did not correlate with histopathological features of RB. Conclusions The findings of the study convincingly suggest the presence of a stromal component in RB tumours. The interactions between stromal cells and tumour cells might be of profound importance in RB progression.
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Affiliation(s)
- Rajeswari Raguraman
- Department of Larsen and Toubro Ocular Pathology, Vision Research Foundation, Sankara Nethralaya, Chennai, India.,School of Medicine, Centre for Molecular and Medical Research, Deakin University, Geelong, Victoria, Australia
| | - Sowmya Parameswaran
- Radheshyam Kanoi Stem Cell Laboratory, Vision Research Foundation, Sankara Nethralaya, Chennai, India
| | - Jagat Rakesh Kanwar
- School of Medicine, Centre for Molecular and Medical Research, Deakin University, Geelong, Victoria, Australia
| | - Vikas Khetan
- Department of Ocular Oncology, Medical Research Foundation, Sankara Nethralaya, Chennai, India
| | - Pukhraj Rishi
- Department of Ocular Oncology, Medical Research Foundation, Sankara Nethralaya, Chennai, India
| | - Rupinder Kaur Kanwar
- School of Medicine, Centre for Molecular and Medical Research, Deakin University, Geelong, Victoria, Australia
| | - Subramanian Krishnakumar
- Department of Larsen and Toubro Ocular Pathology, Vision Research Foundation, Sankara Nethralaya, Chennai, India.,School of Medicine, Centre for Molecular and Medical Research, Deakin University, Geelong, Victoria, Australia
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Nalini V, Deepa PR, Raguraman R, Khetan V, Reddy MA, Krishnakumar S. Targeting HMGA2 in Retinoblastoma Cells in vitro Using the Aptamer Strategy. Ocul Oncol Pathol 2016; 2:262-269. [PMID: 27843907 DOI: 10.1159/000447300] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [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: 03/22/2016] [Revised: 05/31/2016] [Indexed: 12/24/2022] Open
Abstract
High-mobility group A2 (HMGA2) protein regulates retinoblastoma (RB) cancer cell proliferation. Here, a stable phosphorothioate-modified HMGA2 aptamer was used to block HMGA2 protein function in RB cells. HMGA2-aptamer internalisation in RB cells (Y79, Weri Rb1) and non-neoplastic human retinal cells (MIO-M1) were optimised. Aptamer induced dose-dependent cytotoxicity in RB cancer cells (0.25-1.5 µM). Increased expression of TGFβ, SMAD4, CDH1, BAX, CASP 3, PARP mRNA and decreased SNAI1, Bcl2 mRNA levels in aptamer-treated RB cells suggests the activation of TGFβ-SMAD4-mediated apoptotic pathway. Synergistic effect with etoposide was observed in aptamer treated RB cells (p value ≤0.05). No significant toxicity was observed in non-neoplastic retinal cells.
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Affiliation(s)
- Venkatesan Nalini
- Department of Larsen & Toubro Ocular Pathology, The Kamalnayan Bajaj Institute for Research in Vision & Ophthalmology, Vision Research Foundation, Chennai, India; Birla Institute of Technology and Science (BITS), Pilani, India
| | - Perinkulam Ravi Deepa
- Department of Biological Sciences, Birla Institute of Technology and Science (BITS), Pilani, India
| | - Rajeswari Raguraman
- Department of Larsen & Toubro Ocular Pathology, The Kamalnayan Bajaj Institute for Research in Vision & Ophthalmology, Vision Research Foundation, Chennai, India
| | - Vikas Khetan
- Department of Vitreoretina and Oncology, Medical Research Foundation, Sankara Nethralaya, Chennai, India
| | | | - Subramanian Krishnakumar
- Department of Larsen & Toubro Ocular Pathology, The Kamalnayan Bajaj Institute for Research in Vision & Ophthalmology, Vision Research Foundation, Chennai, India
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Venkatesan N, Kanwar J, Deepa PR, Khetan V, Crowley TM, Raguraman R, Sugneswari G, Rishi P, Natarajan V, Biswas J, Krishnakumar S. Clinico-Pathological Association of Delineated miRNAs in Uveal Melanoma with Monosomy 3/Disomy 3 Chromosomal Aberrations. PLoS One 2016; 11:e0146128. [PMID: 26812476 PMCID: PMC4728065 DOI: 10.1371/journal.pone.0146128] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/19/2015] [Accepted: 12/14/2015] [Indexed: 12/15/2022] Open
Abstract
Purpose To correlate the differentially expressed miRNAs with clinico-pathological features in uveal melanoma (UM) tumors harbouring chromosomal 3 aberrations among South Asian Indian cohort. Methods Based on chromosomal 3 aberration, UM (n = 86) were grouped into monosomy 3 (M3; n = 51) and disomy 3 (D3; n = 35) by chromogenic in-situ hybridisation (CISH). The clinico-pathological features were recorded. miRNA profiling was performed in formalin fixed paraffin embedded (FFPE) UM samples (n = 6) using Agilent, Human miRNA microarray, 8x15KV3 arrays. The association between miRNAs and clinico-pathological features were studied using univariate and multivariate analysis. miRNA-gene targets were predicted using Target-scan and MiRanda database. Significantly dys-regulated miRNAs were validated in FFPE UM (n = 86) and mRNAs were validated in frozen UM (n = 10) by qRT-PCR. Metastasis free-survival and miRNA expressions were analysed by Kaplen-Meier analysis in UM tissues (n = 52). Results Unsupervised analysis revealed 585 differentially expressed miRNAs while supervised analysis demonstrated 82 miRNAs (FDR; Q = 0.0). Differential expression of 8 miRNAs: miR-214, miR-149*, miR-143, miR-146b, miR-199a, let7b, miR-1238 and miR-134 were studied. Gene target prediction revealed SMAD4, WISP1, HIPK1, HDAC8 and C-KIT as the post-transcriptional regulators of miR-146b, miR-199a, miR-1238 and miR-134. Five miRNAs (miR-214, miR146b, miR-143, miR-199a and miR-134) were found to be differentially expressed in M3/ D3 UM tumors. In UM patients with liver metastasis, miR-149* and miR-134 expressions were strongly correlated. Conclusion UM can be stratified using miRNAs from FFPE sections. miRNAs predicting liver metastasis and survival have been identified. Mechanistic linkage of de-regulated miRNA/mRNA expressions provide new insights on their role in UM progression and aggressiveness.
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Affiliation(s)
- Nalini Venkatesan
- Larsen & Toubro Department of Ocular Pathology, Vision Research Foundation, Sankara Nethralaya, 18/41, College road, Chennai—600006, India
- Department of Biological Sciences, Birla Institute of Technology and Science (BITS), Pilani-333031, Rajasthan, India
| | - Jagat Kanwar
- Nanomedicine-Laboratory of Immunology and Molecular Biomedical Research (NLIMBR), School of Medicine (SoM), Molecular and Medical Research (MMR) Strategic Research Centre, Faculty of Health, Deakin University, Pigdons Road, Waurn Ponds, Geelong, Victoria 3217, Australia
| | - Perinkulam Ravi Deepa
- Department of Biological Sciences, Birla Institute of Technology and Science (BITS), Pilani-333031, Rajasthan, India
| | - Vikas Khetan
- Department of Vitreoretinal and Ocular Oncology, Medical Research Foundation, Sankara Nethralaya, 18/41, College road, Chennai—600006, India
| | - Tamsyn M. Crowley
- School of Medicine, Deakin University, and Australian Animal Health Laboratories, CSIRO, Australia
| | - Rajeswari Raguraman
- Larsen & Toubro Department of Ocular Pathology, Vision Research Foundation, Sankara Nethralaya, 18/41, College road, Chennai—600006, India
| | - Ganesan Sugneswari
- Department of Vitreoretinal and Ocular Oncology, Medical Research Foundation, Sankara Nethralaya, 18/41, College road, Chennai—600006, India
| | - Pukhraj Rishi
- Department of Vitreoretinal and Ocular Oncology, Medical Research Foundation, Sankara Nethralaya, 18/41, College road, Chennai—600006, India
| | - Viswanathan Natarajan
- Department of Bio-statistics, Medical Research Foundation, Sankara Nethralaya, 41, College road, Chennai—600006, India
| | - Jyotirmay Biswas
- Larsen & Toubro Department of Ocular Pathology, Vision Research Foundation, Sankara Nethralaya, 18/41, College road, Chennai—600006, India
| | - Subramanian Krishnakumar
- Larsen & Toubro Department of Ocular Pathology, Vision Research Foundation, Sankara Nethralaya, 18/41, College road, Chennai—600006, India
- * E-mail:
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Smiline GAS, Pandi SK, Hariprasad P, Raguraman R. A preliminary study on the screening of emerging drug resistance among the caries pathogens isolated from carious dentine. Indian J Dent Res 2013; 23:26-30. [PMID: 22842245 DOI: 10.4103/0970-9290.99033] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022] Open
Abstract
BACKGROUND Dental caries being the commonest unmet public health problem indicates its need to urge the dentists to overcome this problem globally. Caries exhibit in different types and is found to be associated with co-aggregation property of microbial flora with other oral hygienic factors. In spite of the surgical removals, excavations and administration of antimicrobials for carious dentine, there seems to be repeated infection and chronic prevalence of caries. A complete understanding of microbial etiology and prevention of emerging drug-resistant strains will aid in the eradication of this chronic dentine problem condition from the oral cavity. AIM This study is aimed to isolate the predominant bacterial pathogens associated with caries and to screen for the emergence of drug resistance among the isolated caries pathogens. MATERIALS AND METHODS Carious dentine specimens were collected from 75 endodontic patients and the samples were processed microbiologically to isolate the caries pathogens. Identification of the strains was done by standard biochemical characterization studies. Statistical analysis of the isolates was done by Pearson Chi-square test and Fisher's exact test. The predominant isolates were subjected to antimicrobial sensitivity test using Kirby Bauer's method. The results were recorded and analyzed for drug resistance. RESULTS Carious dentine samples yielded a high percentage of Lactobacillus sp., and Candida albicans from different type of caries. Among the study population, dentinal caries was the most predominant type affecting most males with other associated risk factors. Nearly 47.3% of the isolated Lactobacillus sp. and 55.5% of the yeast C. albicans were screened to show resistance against the antimicrobials used for the study. CONCLUSION This study concludes by stating that Lactobacillus sp., and C. albicans are mostly involved in the caries etiology and show resistance to the commonest antimicrobial agent. This implicates the need for periodical antimicrobial susceptibility examination of the caries pathogens that will aid to prevent the emergence of resistance property among the dentinal pathogenic organisms.
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Affiliation(s)
- Girija A S Smiline
- Department of Microbiology, Meenakshi Ammal Dental College, Madhuravoyal, Chennai, India
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