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Lachinani L, Forouzanfar M, Dormiani K, Soltani BM, Dolatshahi K, Hakimian SM, Dokanehiifard S, Nasr-Esfahani MH. The oncogene Musashi1 encodes novel miRNAs in breast cancer. Sci Rep 2023; 13:13710. [PMID: 37607966 PMCID: PMC10444885 DOI: 10.1038/s41598-023-40666-9] [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] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/18/2023] [Accepted: 08/16/2023] [Indexed: 08/24/2023] Open
Abstract
RNA-binding protein Musashi1 (MSI1) shows an increased expression level in several cancers and has been introduced as a prognostic marker in some malignancies. It is expected that if any miRNA is encoded by this gene, it might have a role in cancer development or could be considered as a prognostic biomarker. Accordingly, in this study, we aimed to find novel miRNA(s) inside the intronic regions of the MSI1 gene. Here, we report two novel miRNAs within intron 4 of MSI1 gene, named MSM2 and MSM3, which were selected among several miRNA precursors predicted by bioinformatic studies. For experimental analysis, corresponding precursor miRNAs were transfected into HEK293T cells and exogenous expression of the mature miRNAs were detected. Two mature miRNAs, MSM3-3p and MSM3-5p were generated by MSM3 precursor and one, MSM2-5p was derived from MSM2. Besides, endogenous expression of MSM2-5p and MSM3-3p was detected in MCF-7 and SH-SY5Y cell lines. Expression of both mature miRNAs was also detected in clinical samples of breast cancer. Additionally, the interaction between the MSM3-3p and 3'UTR region of PDE11A was confirmed by dual luciferase assay. Overall, our data demonstrated that MSI1 gene encodes two novel miRNAs in breast cancer cells.
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Affiliation(s)
- Liana Lachinani
- Department of Animal Biotechnology, Cell Science Research Center, Royan Institute for Biotechnology, ACECR, Isfahan, Iran
| | - Mahboobeh Forouzanfar
- Department of Animal Biotechnology, Cell Science Research Center, Royan Institute for Biotechnology, ACECR, Isfahan, Iran
| | - Kianoush Dormiani
- Department of Animal Biotechnology, Cell Science Research Center, Royan Institute for Biotechnology, ACECR, Isfahan, Iran.
| | - Bahram Mohammad Soltani
- Department of Genetics, Faculty of Biological Sciences, Tarbiat Modares University, Tehran, Iran
| | - Kamran Dolatshahi
- Department of Medicine, Najafabad Branch, Islamic Azad University, Najafabad, Iran
| | - Sayyed Mohammadreza Hakimian
- Ordibehesht Breast Clinic, Isfahan, Iran
- Poursina Hakim Digestive Diseases Research Center, Isfahan University of Medical Sciences, Isfahan, Iran
| | - Sadat Dokanehiifard
- Department of Human Genetics, Sylvester Comprehensive Cancer Center, University of Miami Miller School of Medicine, Biomedical Research Building, Miami, FL, USA
| | - Mohammad Hossein Nasr-Esfahani
- Department of Animal Biotechnology, Cell Science Research Center, Royan Institute for Biotechnology, ACECR, Isfahan, Iran.
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Gharbi S, Mohammadi Z, Dezaki MS, Dokanehiifard S, Dabiri S, Korsching E. Characterization of the first microRNA in human CDH1 that affects cell cycle and apoptosis and indicates breast cancers progression. J Cell Biochem 2022; 123:657-672. [PMID: 34997630 DOI: 10.1002/jcb.30211] [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: 09/27/2021] [Revised: 11/26/2021] [Accepted: 12/21/2021] [Indexed: 11/12/2022]
Abstract
The E-cadherin protein (Cadherin 1, gene: CDH1), a master regulator of the human epithelial homeostasis, contributes to the epithelial-mesenchymal transition (EMT) which confers cell migratory features to the cells. The EMT is central to many pathophysiological changes in cancer. Therefore, a better understanding of this regulatory scenario is beneficial for therapeutic regiments. The CDH1 gene is approximately 100 kbp long and consists of 16 exons with a relatively large second intron. Since none microRNA (miRNA) has been identified in CDH1 up to now we screened the CDH1 gene for promising miRNA hairpin structures in silico. Out of the 27 hairpin structures we identified, one stable RNA fold with a promising sequence motive was selected for experimental verification. The exogenous validation of the hairpin sequence was performed by transfection of HEK293T cells and the mature miRNA sequences could be verified by quantitative polymerase chain reaction. The endogenous expression of the mature miRNA provisionally named CDH1-i2-miR-1 could be confirmed in two normal (HEK293T, HUVEK) and five cancer cell lines (MCF7, MDA-MB-231, SW480, HT-29, A549). The functional characterization by the 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide assay showed a suppression of HEK293T cell proliferation. A flow cytometry-based approach showed the ability of CDH1-i2-miR-1 to arrest transfected cells on a G2/M state while annexin staining exemplified an apoptotic effect. BAX and PTEN expression levels were affected following the overexpression with the new miRNA. The in vivo expression level was assessed in 35 breast tumor tissues and their paired nonmalignant marginal part. A fourfold downregulation in the tumor specimens compared to their marginal controls could be observed. It can be concluded that the sequence of the hub gene CDH1 harbors at least one miRNA but eventually even more relevant for the pathophysiology of breast cancer.
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Affiliation(s)
- Sedigheh Gharbi
- Department of Biology, Faculty of Sciences, Shahid Bahonar University of Kerman, Kerman, Iran
| | - Zahra Mohammadi
- Department of Biology, Faculty of Sciences, Shahid Bahonar University of Kerman, Kerman, Iran
| | - Maryam Saedi Dezaki
- Department of Biology, Faculty of Sciences, Shahid Bahonar University of Kerman, Kerman, Iran
| | - Sadat Dokanehiifard
- Department of Human Genetics, Sylvester Comprehensive Cancer Center, University of Miami Miller School of Medicine, Miami, Florida, USA
| | - Shahriar Dabiri
- Department of Pathology, Pathology and Stem Cell Research Center, Kerman University of Medical Sciences, Kerman, Iran
| | - Eberhard Korsching
- Institute of Bioinformatics, Faculty of Medicine, University of Münster, Münster, Germany
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Dabiri H, Soltani BM, Dokanehiifard S, Jahanbakhshi A, Khaleghi M. Up-Regulation of Hsa-miR-11181 in Glioblastoma Multiforme as A Regulator of AKT2 and TGFBR1 Signalling. Cell J 2021; 23:421-428. [PMID: 34455717 PMCID: PMC8405078 DOI: 10.22074/cellj.2021.7734] [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] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/12/2019] [Accepted: 01/27/2020] [Indexed: 11/16/2022]
Abstract
Objective MicroRNAs (miRNAs) are short non-coding RNAs that play a role in post-transcriptional regulation of gene
expression. Hsa-miR-11181 was originally introduced as a regulator of genes involved in some brain tumours. Due to the
high expression of Hsa-miR-11181 in limited glioblastoma brain tumours, in this study we intend to assess the expressions of
Hsa-miR-11181 and Has-miR11181-3p in brain tumour tissues and attribute new target genes to these miRNAs. Materials and Methods In this experimental study, total RNA from brain tissue samples was extracted for real-time
quantitative polymerase chain reaction (RT-qPCR) analysis after cDNA synthesis. In order to confirm a direct interaction
of Hsa-miR-11181 with two target genes, the 3ˊ UTR of AKT2 and transforming growth factor-beta receptor 1 (TGFBR1)
were cloned separately for assessment by the dual luciferase assay.
Results RT-qPCR analysis indicated that both Hsa-miR-11181-5p and Hsa-miR-11181-3p specifically up-regulated
in higher grades of glioma tumours versus other brain tumour types. Consistently, lower expression levels of AKT2
and TGFBR1 were detected in higher grade gliomas compared to other types of brain tumours, which was inverse to
the level of expression detected for the heparin-binding EGF-like growth factor (HBEGF) gene. The results of the dual
luciferase assay supported a direct interaction of Hsa-miR-11181 with the 3ˊ UTR sequences of the AKT2 and TGFBR1
genes.
Conclusion Overall, our data suggest that miR-1118 is a potential molecular biomarker for discrimination of glioma
brain tumours from other brain tumour types.
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Affiliation(s)
- Hamed Dabiri
- Molecular Genetics Department, Faculty of Biological Sciences, Tarbiat Modares University, Tehran, Iran
| | - Bahram Mohammad Soltani
- Molecular Genetics Department, Faculty of Biological Sciences, Tarbiat Modares University, Tehran, Iran.
| | - Sadat Dokanehiifard
- Molecular Genetics Department, Faculty of Biological Sciences, Tarbiat Modares University, Tehran, Iran
| | - Amin Jahanbakhshi
- Stem Cell and Regenerative Medicine Research Centre, Iran University of Medical Sciences (IUMS), Tehran, Iran
| | - Mehdi Khaleghi
- Department of Neurosurgery, Shariati Hospital, Tehran University of Medical Science (TUMS), Tehran, Iran
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Dokanehiifard S, Soltani BM, Ghiasi P, Baharvand H, Reza Ganjali M, Hosseinkhani S. hsa-miR-766-5p as a new regulator of mitochondrial apoptosis pathway for discriminating of cell death from cardiac differentiation. Gene 2020; 736:144448. [DOI: 10.1016/j.gene.2020.144448] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/04/2019] [Revised: 01/26/2020] [Accepted: 02/04/2020] [Indexed: 12/19/2022]
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Shabaninejad Z, Yousefi F, Movahedpour A, Ghasemi Y, Dokanehiifard S, Rezaei S, Aryan R, Savardashtaki A, Mirzaei H. Electrochemical-based biosensors for microRNA detection: Nanotechnology comes into view. Anal Biochem 2019; 581:113349. [PMID: 31254490 DOI: 10.1016/j.ab.2019.113349] [Citation(s) in RCA: 79] [Impact Index Per Article: 15.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/25/2019] [Revised: 06/24/2019] [Accepted: 06/25/2019] [Indexed: 01/04/2023]
Abstract
Nanotechnology plays an undeniable significant role in medical sciences, particularly in the field of biomedicine. Development of several diagnostic procedures in medicine has been possible through the beneficial application of nano-materials, among which electrochemical nano-biosensors can be mentioned. They can be employed to quantify various clinical biomarkers in detection, evaluation, and follow up stages of the illnesses. MicroRNAs, a group of regulatory short RNA fragments, added a new dimension to the management and diagnosis of several diseases. Mature miRNAs are single-stranded RNA molecules approximately 22 nucleotides in length, which regulate a vast range of biological functions from cellular proliferation and death to cancer development and progression. Recently, diagnostic value of miRNAs in various diseases has been demonstrated. There are many traditional methods for detection of miRNAs including northern blotting, quantitative real time PCR (qRT-PCR), microarray technology, nanotechnology-based approaches, and molecular biology tools including miRNA biosensors. In comparison with other techniques, electrochemical nucleic acid biosensor methods exhibit many interesting features, and could play an important role in the future nucleic acid analysis. This review paper provides an overview of some different types of nanotechnology-based biosensors for detection of miRNAs.
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Affiliation(s)
- Zahra Shabaninejad
- Department of Nanobiotechnology, School of Basic Sciences, Tarbiat Modares University, Tehran, Iran
| | - Fatemeh Yousefi
- Department of Genetics, School of Basic Sciences, Tarbiat Modares University, Tehran, Iran
| | - Ahmad Movahedpour
- Department of Medical Biotechnology, School of Advanced Medical Sciences and Technologies, Shiraz University of Medical Sciences, Shiraz, Iran; Student Research Committee, Shiraz University of Medical Sciences, Shiraz, Iran
| | - Younes Ghasemi
- Department of Pharmaceutical Biotechnology, School of Pharmacy, Shiraz University of Medical Sciences, Shiraz, Iran; Pharmaceutical Sciences Research Center, Shiraz University of Medical Sciences, Shiraz, Iran
| | - Sadat Dokanehiifard
- Department of Human Genetics, Sylvester Comprehensive Cancer Center, University of Miami Miller School of Medicine, Miami, FL, 33136, USA
| | - Samaneh Rezaei
- Department of Medical Biotechnology, School of Medicine, Mashhad University of Medical Sciences, Mashhad, Iran
| | - Reihaneh Aryan
- School of Medicine, Mashhad University of Medical Sciences, Mashhad, Iran
| | - Amir Savardashtaki
- Department of Medical Biotechnology, School of Advanced Medical Sciences and Technologies, Shiraz University of Medical Sciences, Shiraz, Iran; Pharmaceutical Sciences Research Center, Shiraz University of Medical Sciences, Shiraz, Iran.
| | - Hamed Mirzaei
- Research Center for Biochemistry and Nutrition in Metabolic Diseases, Kashan University of Medical Sciences, Kashan, Iran.
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Dokanehiifard S, Soltani BM. TrkC-miR2 regulates TGFβ signaling pathway through targeting of SMAD3 transcript. J Cell Biochem 2019; 120:2634-2641. [PMID: 30304551 DOI: 10.1002/jcb.27572] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [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: 03/25/2018] [Accepted: 08/06/2018] [Indexed: 01/24/2023]
Abstract
TrkC, neurotrophin receptor, functions inside and outside of the nervous system and has a crucial effect on the regulation of cardiovascular formation. Recently, we introduced TrkC-miR2 as a novel microRNA located in TrkC gene, which is a regulator of the Wnt signaling pathway. Here, we presented a lot of evidence showing that TrkC-miR2 also regulates the transforming growth factor-beta (TGFβ) signaling pathway. Bioinformatics studies predicted SMAD3 as one of the bona fide TrkC-miR2 target genes. Quantitative reverse transcription PCR (RT-qPCR), Western blot analysis, and dual luciferase assay analysis confirmed that SMAD3 is targeted by TrkC-miR2. On the other hand, overexpression of TrkC-miR2 in cardiosphere-derived cells (CDCs) rendered downregulation of TGFβR1, TGFβR2, and SMAD7 detected by RT-qPCR. Consistently, an inverse correlation of expression between TrkC-miR2 and SMAD3 genes was detected during the course of CDC differentiation, and also during the course of human embryonic stem cells differentiation to cardiomyocytes. Overall, we conclude that TrkC-miR2 downregulates the expression of SMAD3 and potentially regulates the TGFβ signaling pathway. Knowing its approved effect on Wnt signaling, TrkC-miR2 here is introduced as a common regulator of both the Wnt and TGFβ signaling pathways. Therefore, it may be a potential key element in controlling both of these signaling pathways in cell processes like colorectal cancer and cardiogenesis.
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Affiliation(s)
- Sadat Dokanehiifard
- Department of Molecular Genetics, Faculty of Biological Sciences, Tarbiat Modares University, Tehran, Iran
| | - Bahram M Soltani
- Department of Molecular Genetics, Faculty of Biological Sciences, Tarbiat Modares University, Tehran, Iran
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Dokanehiifard S, Soltani BM. Hsa-miR-11181 regulates Wnt signaling pathway through targeting of APC2 transcripts in SW480 cell line. Gene 2018; 641:297-302. [DOI: 10.1016/j.gene.2017.10.075] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/12/2017] [Revised: 09/28/2017] [Accepted: 10/26/2017] [Indexed: 12/23/2022]
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8
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Aghdaei FH, Soltani BM, Dokanehiifard S, Mowla SJ, Soleimani M. Overexpression of hsa-miR-939 follows by NGFR down-regulation and apoptosis reduction. J Biosci 2017; 42:23-30. [DOI: 10.1007/s12038-017-9669-6] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
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9
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Dokanehiifard S, Yasari A, Najafi H, Jafarzadeh M, Nikkhah M, Mowla SJ, Soltani BM. A novel microRNA located in the TrkC gene regulates the Wnt signaling pathway and is differentially expressed in colorectal cancer specimens. J Biol Chem 2017; 292:7566-7577. [PMID: 28100780 DOI: 10.1074/jbc.m116.760710] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [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: 09/27/2016] [Revised: 01/18/2017] [Indexed: 01/12/2023] Open
Abstract
Tropomyosin receptor kinase C (TrkC) is involved in cell survival, apoptosis, differentiation, and tumorigenesis. TrkC diverse functions might be attributed to the hypothetical non-coding RNAs embedded within the gene. Using bioinformatics approaches, a novel microRNA named TrkC-miR2 was predicted within the TrkC gene capable of regulating the Wnt pathway. For experimental verification of this microRNA, the predicted TrkC-premir2 sequence was overexpressed in SW480 cells, which led to the detection of two mature TrkC-miR2 isomiRs, and their endogenous forms were detected in human cell lines as well. Later, an independent promoter was deduced for TrkC-miR2 after the treatment of HCT116 cells with 5-azacytidine, which resulted in differential expression of TrkC-miR2 and TrkC host gene. RT-quantitative PCR and luciferase assays indicated that the APC2 gene is targeted by TrkC-miR2, and Wnt signaling is up-regulated. Also, Wnt inhibition by using small molecules along with TrkC-miR2 overexpression and TOP/FOP flash assays confirmed the positive effect of TrkC-miR2 on the Wnt pathway. Consistently, TrkC-miR2 overexpression promoted SW480 cell survival, which was detected by flow cytometry, MTT (3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide) assays, and crystal violate analysis. RT-qPCR analysis revealed that TrkC-miR2 is significantly up-regulated (∼70 times) in colorectal tumor tissues compared with their normal pairs. Moreover, the TrkC-miR2 expression level discriminated grades of tumor malignancies, which was consistent with its endogenous levels in HCT116, HT29, and SW480 colorectal cancer cell lines. Finally, an opposite expression pattern was observed for TrkC-miR2 and the APC2 gene in colorectal cancer specimens. In conclusion, here we introduce TrkC-miR2 as a novel regulator of Wnt signaling, which might be a candidate oncogenic colorectal cancer biomarker.
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Affiliation(s)
- Sadat Dokanehiifard
- From the Department of Molecular Genetics, Faculty of Biological Sciences and
| | - Atena Yasari
- From the Department of Molecular Genetics, Faculty of Biological Sciences and
| | - Hadi Najafi
- From the Department of Molecular Genetics, Faculty of Biological Sciences and
| | - Meisam Jafarzadeh
- From the Department of Molecular Genetics, Faculty of Biological Sciences and
| | - Maryam Nikkhah
- Department of Nano-Biotechnology, Faculty of Biological Sciences, Tarbiat Modares University, Tehran, Iran 111-14115
| | - Seyed Javad Mowla
- From the Department of Molecular Genetics, Faculty of Biological Sciences and
| | - Bahram M Soltani
- From the Department of Molecular Genetics, Faculty of Biological Sciences and
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Najafi H, Soltani BM, Dokanehiifard S, Nasiri S, Mowla SJ. Alternative splicing of the OCC-1 gene generates three splice variants and a novel exonic microRNA, which regulate the Wnt signaling pathway. RNA 2017; 23:70-85. [PMID: 27986894 PMCID: PMC5159651 DOI: 10.1261/rna.056317.116] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/12/2016] [Accepted: 10/10/2016] [Indexed: 06/06/2023]
Abstract
The Wnt signaling pathway is hyperactivated in most colorectal cancers (CRC). Finding new regulators of this pathway represents the potential for cancer diagnosis or treatment. OCC-1 was initially reported as an up-regulated gene in colon carcinoma, without knowing its mechanism of action. Here, two novel transcript variants and an exonic microRNA that originated from the OCC-1 gene are reported, showing positive effects on Wnt activity. Up-regulation of the known OCC-1 variant (assigned as OCC-1A/B) was limited to CRC, and its overexpression increased survival of CRC-originated SW480 cells (Wnt+), while resulting in apoptosis of Wnt-suppressed SW480 cells or HeLa cells (Wnt-) detected by PI staining. Immunocytochemistry showed that the OCC-1A/B-encoded peptide was localized to the nucleus, where its overexpression resulted in Wnt signaling up-regulation, detected by TOP/FOPflash assay. The noncoding portion of the OCC-1A/B transcript had a suppressive effect on Wnt activity and had a negative correlation with APPL2 neighboring gene expression. Unlike OCC-1A/B, the novel OCC-1C splice variant had no expression alteration in CRC, and it seemed to encode a smaller peptide with cytoplasmic localization. A 60-nucleotide (nt) fragment containing an AUG start codon is spliced out to produce an OCC-1D noncoding RNA variant. The 60-nt RNA was validated as the precursor of a novel microRNA, which we named miR-ex1 Both OCC-1D and miR-ex1 were coordinately up-regulated in CRC. MiR-ex1 functional analysis revealed that it is targeting the APC2 tumor suppressor gene and is an activator of the Wnt signaling pathway. Overall, the OCC-1 gene is now introduced as a novel Wnt signaling regulator and as a potential therapeutic target.
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Affiliation(s)
- Hadi Najafi
- Department of Genetics, Faculty of Biological Sciences, Tarbiat Modares University, 14115-116 Tehran, Iran
| | - Bahram M Soltani
- Department of Genetics, Faculty of Biological Sciences, Tarbiat Modares University, 14115-116 Tehran, Iran
| | - Sadat Dokanehiifard
- Department of Genetics, Faculty of Biological Sciences, Tarbiat Modares University, 14115-116 Tehran, Iran
| | - Shirzad Nasiri
- Tehran University of Medical Sciences, Shariati Hospital, 1411713135 Tehran, Iran
| | - Seyed Javad Mowla
- Department of Genetics, Faculty of Biological Sciences, Tarbiat Modares University, 14115-116 Tehran, Iran
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Saleh AJ, Soltani BM, Dokanehiifard S, Medlej A, Tavalaei M, Mowla SJ. Experimental verification of a predicted novel microRNA located in human PIK3CA gene with a potential oncogenic function in colorectal cancer. Tumour Biol 2016; 37:14089-14101. [PMID: 27511117 DOI: 10.1007/s13277-016-5264-y] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [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: 01/20/2016] [Accepted: 07/15/2016] [Indexed: 12/21/2022] Open
Abstract
PI3K/AKT signaling is involved in cell survival, proliferation, and migration. In this pathway, PI3Kα enzyme is composed of a regulatory protein encoded by p85 gene and a catalytic protein encoded by PIK3CA gene. Human PIK3CA locus is amplified in several cancers including lung and colorectal cancer (CRC). Therefore, microRNAs (miRNAs) that are encoded within the PIK3CA gene might have a role in cancer development. Here, we report a novel microRNA named PIK3CA-miR1 (EBI accession no. LN626315), which is located within PIK3CA gene. A DNA segment corresponding to PIK3CA-premir1 sequence was transfected in human cell lines that resulted in generation of mature exogenous PIK3CA-miR1. Following the overexpression of PIK3CA-miR1, its predicted target genes (APPL1 and TrkC) were significantly downregulated in the CRC-originated HCT116 and SW480 cell lines, detected by qRT-PCR. Then, dual luciferase assay supported the interaction of PIK3CA-miR1 with APPL1 and TrkC transcripts. Endogenous PIK3CA-miR1 expression was also detected in several cell lines (highly in HCT116 and SW480) and highly in CRC specimens. Consistently, overexpression of PIK3CA-premir1 in HCT116 and SW480 cells resulted in significant reduction of the sub-G1 cell distribution and apoptotic cell rate, as detected by flowcytometry, and resulted in increased cell proliferation, as detected by 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide (MTT) assay. PIK3CA-miR1 overexpression also resulted in Wnt signaling upregulation detected by Top/Fop assay. Overall, accumulative evidences indicated the presence of a bona fide novel onco-miRNA encoded within the PIK3CA oncogene, which is highly expressed in colorectal cancer and has a survival effect in CRC-originated cells.
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Affiliation(s)
- Ali Jason Saleh
- Department of Genetics, Faculty of Biological Sciences, Tarbiat Modares University, Tehran, Iran
| | - Bahram M Soltani
- Department of Genetics, Faculty of Biological Sciences, Tarbiat Modares University, Tehran, Iran.
| | - Sadat Dokanehiifard
- Department of Genetics, Faculty of Biological Sciences, Tarbiat Modares University, Tehran, Iran
| | - Abdallah Medlej
- Department of Genetics, Faculty of Biological Sciences, Tarbiat Modares University, Tehran, Iran
| | | | - Seyed Javad Mowla
- Department of Genetics, Faculty of Biological Sciences, Tarbiat Modares University, Tehran, Iran
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12
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Dokanehiifard S, Soltani BM, Parsi S, Hosseini F, Javan M, Mowla SJ. Experimental verification of a conserved intronic microRNA located in the human TrkC gene with a cell type-dependent apoptotic function. Cell Mol Life Sci 2015; 72:2613-25. [PMID: 25772499 DOI: 10.1007/s00018-015-1868-4] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/24/2014] [Revised: 02/09/2015] [Accepted: 02/17/2015] [Indexed: 12/21/2022]
Abstract
Tropomyosin receptor kinase C (TrkC) is involved in cell survival, apoptosis induction and tumorigenesis. We hypothesized that, similar to p75(NTR) receptor, some of the diverse functions of TrkC could be mediated by a microRNA (miRNA) embedded within the gene. Here, we experimentally verified the expression and processing of two bioinformatically predicted miRNAs named TrkC-miR1-5p and TrkC-miR1-3p. Transfecting a DNA fragment corresponding to the TrkC-premir1 sequence in HEK293t cells caused ~300-fold elevation in the level of mature TrkC-miR1 and also a significant downregulation of its predicted target genes. Furthermore, endogenous TrkC-miR1 was detected in several cell lines and brain tumors confirming its endogenous generation. Furthermore, its orthologous miRNA was detected in developing rat brain. Accordingly, TrkC-miR1 expression was increased during the course of neural differentiation of NT2 cell, whereas its suppression attenuated NT2 differentiation. Consistent with opposite functions of TrkC, TrkC-miR1 overexpression promoted survival and apoptosis in U87 and HEK293t cell lines, respectively. In conclusion, our data report the discovery of a new miRNA with overlapping function to TrkC.
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Affiliation(s)
- Sadat Dokanehiifard
- Department of Molecular Genetics, Faculty of Biological Sciences, Tarbiat Modares University, Tehran, Iran
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