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Tong Y, Jia L, Li M, Li H, Wang S. Identification of exosomal circSLC26A4 as a liquid biopsy marker for cervical cancer. PLoS One 2024; 19:e0305050. [PMID: 38861540 PMCID: PMC11166277 DOI: 10.1371/journal.pone.0305050] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/10/2023] [Accepted: 05/20/2024] [Indexed: 06/13/2024] Open
Abstract
OBJECTIVE Circular RNA SLC26A4 (circSLC26A4) functions as an oncogene in the initiation and progression of cervical cancer (CC). However, the clinical role of plasma exosomal circSLC26A4 in CC is poorly known. This study aims to develop an accurate diagnostic method based on circulating exosomal circSLC26A4. METHODS In this study, exosomal circSLC26A4 derived from CC cell lines (CaSki, SiHa, and HeLa) and human cervical epithelial cells (HcerEpic) was measured and compared using quantitative reverse transcriptase polymerase chain reaction (qRT-PCR). Additionally, 56 volunteers, including 18 CC patients, 18 cervical high-grade squamous intraepithelial lesion (HSIL) patients, and 20 healthy volunteers, were enrolled. qRT-PCR was also performed to measure the plasma exosomal circSLC26A4 levels in all participants. RESULTS The exosomal circSLC26A4 expression level derived from CC cells was significantly elevated compared to it derived from HcerEpic cells. Plasma exosomal circSLC26A4 levels in CC patients were significantly higher than in healthy women and HSIL patients (P < 0.05). In addition, high plasma exosomal circSLC26A4 expression was positively associated with lymph node metastasis and FIGO stage (all P < 0.05). However, no significant correlation was found between plasma exosomal circSLC26A4 expression and age, intravascular cancerous embolus, and perineural invasion (P > 0.05). CONCLUSIONS The high exosomal circSLC26A4 expression is closely related to the occurrence of CC. Plasma exosomal circSLC26A4 can be used as a diagnostic marker for CC.
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Affiliation(s)
- Yutong Tong
- Xinxiang Medical University, Xinxiang, Henan, P.R. China
- Department of Obstetrics and Gynecology, Zhengzhou Central Hospital Affiliated to Zhengzhou University, Zhengzhou, Henan, P.R. China
| | - Lanlan Jia
- Xinxiang Medical University, Xinxiang, Henan, P.R. China
- Department of Obstetrics and Gynecology, Zhengzhou Central Hospital Affiliated to Zhengzhou University, Zhengzhou, Henan, P.R. China
| | - Minghui Li
- Xinxiang Medical University, Xinxiang, Henan, P.R. China
- Department of Obstetrics and Gynecology, Zhengzhou Central Hospital Affiliated to Zhengzhou University, Zhengzhou, Henan, P.R. China
| | - Hongjuan Li
- Department of Obstetrics and Gynecology, Zhengzhou Central Hospital Affiliated to Zhengzhou University, Zhengzhou, Henan, P.R. China
| | - Shuli Wang
- Department of Obstetrics and Gynecology, Zhengzhou Central Hospital Affiliated to Zhengzhou University, Zhengzhou, Henan, P.R. China
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Zhang Y, Liu P, Wen D, Xiong H, Zhou Z, Yan L. Regulation of Cervical Cancer Development by a Novel Circ_0000212/miR-1236-3p/GREM1 ceRNA Crosstalk. Mol Biotechnol 2023; 65:2086-2098. [PMID: 36952219 DOI: 10.1007/s12033-023-00721-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/10/2023] [Accepted: 03/13/2023] [Indexed: 03/24/2023]
Abstract
Circular RNAs (circRNAs) possess important functions in cervical carcinogenesis by operating as competing endogenous RNAs (ceRNAs). Our preliminary bioinformatics predicted the potential circ_0000212/microRNA (miR)-1236-3p/gremlin 1 (GREM1) ceRNA crosstalk. Thus, we further elucidated whether the novel ceRNA crosstalk can participate in cervical cancer development. Circ_0000212, miR-1236-3p and GREM1 were quantified by real-time quantitative polymerase chain reaction (qPCR) and immunoblotting. 5-ethynyl-2'-deoxyuridine (EdU) assay, flow cytometry, and tube formation assay were performed to assess cell proliferation, apoptosis and tube formation, respectively. Transwell assay was used to detect cell migration and invasion. Mouse xenografts were established to evaluate the role of circ_0000212 in vivo. Dual-luciferase reporter assay was performed to verify the direct relationship between miR-1236-3p and circ_0000212 or GREM1. Circ_0000212 expression was elevated in human cervical cancer. Silencing of endogenous circ_0000212 hindered cancer cell proliferation, motility and invasion and induced apoptosis, as well as diminished the tube formation of human umbilical vein endothelial cells (HUVECs) in vitro. Circ_0000212 silencing also weakened tumor growth in vivo. Mechanistically, circ_0000212 directly bound to miR-1236-3p, and downregulation of miR-1236-3p reversed these effects of circ_0000212 silencing on cell malignant phenotypes and HUVEC tube formation. GREM1 was a direct miR-1236-3p target, and its expression was regulated by circ_0000212 through miR-1236-3p. Moreover, miR-1236-3p upregulation impeded cancer cell malignant phenotypes and HUVEC tube formation by targeting GREM1. Our findings identify a novel ceRNA regulatory network, circ_0000212/miR-1236-3p/GREM1 axis, in cervical carcinogenesis, and provide potential targets that can be explored for therapeutic interventions.
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Affiliation(s)
- Yajun Zhang
- Department of Pathology, Lianyungang Maternal and Child Health Hospital, Lianyungang, 222000, China
| | - Peili Liu
- Department of Gynaecology, Lianyungang Maternal and Child Health Hospital, No.669 Qindongmen Road, Haizhou, Lianyungang, 222000, China.
| | - Daoqing Wen
- Department of Gynaecology, Lianyungang Maternal and Child Health Hospital, No.669 Qindongmen Road, Haizhou, Lianyungang, 222000, China
| | - Haizhen Xiong
- Department of Gynaecology, Lianyungang Maternal and Child Health Hospital, No.669 Qindongmen Road, Haizhou, Lianyungang, 222000, China
| | - Zhe Zhou
- Department of Gynaecology, Lianyungang Maternal and Child Health Hospital, No.669 Qindongmen Road, Haizhou, Lianyungang, 222000, China
| | - Li Yan
- Department of Pathology, Lianyungang Maternal and Child Health Hospital, Lianyungang, 222000, China
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3
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Wu S, Zhong B, Yang Y, Wang Y, Pan Z. ceRNA networks in gynecological cancers progression and resistance. J Drug Target 2023; 31:920-930. [PMID: 37724808 DOI: 10.1080/1061186x.2023.2261079] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/15/2023] [Accepted: 05/14/2023] [Indexed: 09/21/2023]
Abstract
Gynecological cancers are the second most common types of cancer in women. Clinical diagnosis of these cancers is often delayed or misdiagnosed due to lack of insight into their tumorigenesis mechanism and specific diagnostic biomarkers. Many studies have demonstrated that competing endogenous RNAs (ceRNAs) modulate the progression and resistance of gynecological cancer through microRNA (miRNA)-mediated mechanisms, which affect gene expression in multiple cancer-related pathways. Here we review studies on the involvement of the ceRNA hypothesis in the progression and resistance of gynaecological cancers to validate some ceRNAs as therapeutic targets and predictive biomarkers.
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Affiliation(s)
- Shuqin Wu
- Jiangxi Medical College, Nanchang University, Nanchang, China
| | - Baoshan Zhong
- Jiangxi Medical College, Nanchang University, Nanchang, China
| | - Yuxin Yang
- Jiangxi Medical College, Nanchang University, Nanchang, China
| | - Yurou Wang
- Jiangxi Medical College, Nanchang University, Nanchang, China
| | - Zezheng Pan
- Faculty of Jiangxi Medical College, Nanchang University, Nanchang, China
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4
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Wu CC, Hou BC, Yang YH, Li XF, Ma HC, Li BX. Circ_0084188 promotes colorectal cancer progression by sponging miR-654-3p and regulating kruppel-like factor 12. Kaohsiung J Med Sci 2023; 39:1062-1076. [PMID: 37698263 DOI: 10.1002/kjm2.12749] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/17/2023] [Revised: 07/13/2023] [Accepted: 07/31/2023] [Indexed: 09/13/2023] Open
Abstract
To investigate the biological role and mechanism of circ_0084188 in colorectal cancer (CRC). Real-time quantitative polymerase chain reaction and western blot assay were used to detect RNA levels and protein levels in CRC cell lines (HCT116 and SW480), respectively. Cell proliferation was evaluated by Cell Counting Kit-8 assay, 5-ethynyl-2'-deoxyuridine assay, and colony formation assays. Cell apoptosis was determined using flow cytometry. Cell migration and invasion were measured by transwell assay. Sphere formation efficiency was determined by sphere formation assay. The interaction between microRNA-654-3p (miR-654-3p) and circ_0084188 or Kruppel-like factor 12 (KLF12) was confirmed by a dual-luciferase reporter, RNA immunoprecipitation and RNA pull-down assays. Xenograft in CRC mice model was utilized for exploring the role of circ_0084188 in vivo.Circ_0084188 was overexpressed in CRC tissues and cells. Circ_0084188 silencing suppressed cell proliferation, migration, invasion, and stemness and induced apoptosis in CRC cells. Circ_0084188 acted as a sponge for miR-654-3p, and circ_0084188 regulated CRC cell behaviors via sponging miR-654-3p. Moreover, KLF12 was a target of miR-654-3p, and miR-654-3p overexpression inhibited the malignant behaviors of CRC cells by downregulating KLF12. Mechanically, circ_0084188 sponged miR-654-3p to regulate KLF12 expression in CRC cells. In addition, circ_0084188 downregulation inhibited tumor growth in vivo.Circ_0084188 knockdown might repress CRC progression partially via regulating the miR-654-3p/KLF12 axis, providing a novel insight into the pathogenesis of CRC.
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Affiliation(s)
- Cui-Cui Wu
- Department of Clinical Laboratory, Affiliated Hospital of Beihua University, Jilin, China
| | - Bai-Chun Hou
- Department of Clinical Laboratory, Affiliated Hospital of Beihua University, Jilin, China
| | - Yu-Han Yang
- Department of Diabetes, Endocrinology and Nutrition, Graduate School of Medicine, Kyoto University, Kyoto, Japan
| | - Xue-Feng Li
- Division of Hepato-Biliary-Pancreatic Surgery and Transplantation, Department of Surgery, Kyoto University Graduate School of Medicine, Kyoto, Japan
| | - Hong-Chao Ma
- Department of Clinical Laboratory, Affiliated Hospital of Beihua University, Jilin, China
| | - Bin-Xian Li
- Department of Clinical Laboratory, Affiliated Hospital of Beihua University, Jilin, China
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Shi J, Rui X, Han C, Wang C, Xu L, Jiang X. circRNF13, a novel N 6-methyladenosine-modified circular RNA, enhances radioresistance in cervical cancer by increasing CXCL1 mRNA stability. Cell Death Discov 2023; 9:253. [PMID: 37468464 DOI: 10.1038/s41420-023-01557-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/18/2023] [Revised: 07/07/2023] [Accepted: 07/13/2023] [Indexed: 07/21/2023] Open
Abstract
BACKGROUND Circular RNAs (circRNAs) and N6-methyladenosine (m6A) have been shown to play an increasingly critical role in the development of different cancers. However, there is limited evidence on how circRNAs and m6A interact to affect the radiosensitivity of cervical cancer (CC). This study provides a mechanistic understanding of the novel m6A-regulated circRNF13 in enhancing radioresistance in CC. METHODS Differentially expressed circRNAs were identified from radiosensitive and radioresistant CC tissues. Meanwhile, these circRNAs were subjected to methylated RNA immunoprecipitation (Me-RIP). Finally, the effects of these circRNAs on radiosensitivity were characterized. RESULTS CircRNF13 was poorly expressed in CC patients that were sensitive to concurrent radiochemotherapy. Experiments conducted both in vitro and in vivo confirmed that the knockdown of circRNF13 potentiated the radiosensitivity of CC cells. Further mechanistic studies revealed that METTL3/YTHDF2 promoted the degradation of circRNF13 and subsequently affected the stability of CXC motif chemokine ligand 1 (CXCL1), ultimately enhancing the radiosensitivity of CC cells. CONCLUSION This study identified circRNF13 as a novel m6A-modified circRNA and validated the METTL3/YTHDF2/circRNF13/CXCL1 axis as a potential target for CC radiotherapy.
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Affiliation(s)
- Junyu Shi
- Department of Gynecology, The Third Affiliated Hospital of Soochow University, Changzhou, 213003, PR China
| | - Xiaohui Rui
- Department of Gynecology, The Third Affiliated Hospital of Soochow University, Changzhou, 213003, PR China
| | - Chunxiao Han
- Department of Gynecology, The Third Affiliated Hospital of Soochow University, Changzhou, 213003, PR China
| | - Chaoping Wang
- Department of Gynecology, The Third Affiliated Hospital of Soochow University, Changzhou, 213003, PR China
| | - Lei Xu
- Department of Gynecology, The Third Affiliated Hospital of Soochow University, Changzhou, 213003, PR China
| | - Xiping Jiang
- Department of Gynecology, The Third Affiliated Hospital of Soochow University, Changzhou, 213003, PR China.
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Li Y, Li S, Shi X, Xin Z, Yang Y, Zhao B, Li Y, Lv L, Ren P, Wu H. KLF12 promotes the proliferation of breast cancer cells by reducing the transcription of p21 in a p53-dependent and p53-independent manner. Cell Death Dis 2023; 14:313. [PMID: 37156774 PMCID: PMC10167366 DOI: 10.1038/s41419-023-05824-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/13/2022] [Revised: 04/20/2023] [Accepted: 04/21/2023] [Indexed: 05/10/2023]
Abstract
Breast cancer is the most common cancer affecting women worldwide. Many genes are involved in the development of breast cancer, including the Kruppel Like Factor 12 (KLF12) gene, which has been implicated in the development and progression of several cancers. However, the comprehensive regulatory network of KLF12 in breast cancer has not yet been fully elucidated. This study examined the role of KLF12 in breast cancer and its associated molecular mechanisms. KLF12 was found to promote the proliferation of breast cancer and inhibit apoptosis in response to genotoxic stress. Subsequent mechanistic studies showed that KLF12 inhibits the activity of the p53/p21 axis, specifically by interacting with p53 and affecting its protein stability via influencing the acetylation and ubiquitination of lysine370/372/373 at the C-terminus of p53. Furthermore, KLF12 disrupted the interaction between p53 and p300, thereby reducing the acetylation of p53 and stability. Meanwhile, KLF12 also inhibited the transcription of p21 independently of p53. These results suggest that KLF12 might have an important role in breast cancer and serve as a potential prognostic marker and therapeutic target.
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Affiliation(s)
- Yanan Li
- School of Bioengineering & Key Laboratory of Protein Modification and Disease, Liaoning Province, Dalian University of Technology, 116024, Dalian, China
| | - Shujing Li
- School of Bioengineering & Key Laboratory of Protein Modification and Disease, Liaoning Province, Dalian University of Technology, 116024, Dalian, China
| | - Xiaoxia Shi
- School of Bioengineering & Key Laboratory of Protein Modification and Disease, Liaoning Province, Dalian University of Technology, 116024, Dalian, China
| | - Zhiqiang Xin
- The Second Hospital of Dalian Medical University, 116000, Dalian, China
| | - Yuxi Yang
- School of Bioengineering & Key Laboratory of Protein Modification and Disease, Liaoning Province, Dalian University of Technology, 116024, Dalian, China
| | - Binggong Zhao
- School of Bioengineering & Key Laboratory of Protein Modification and Disease, Liaoning Province, Dalian University of Technology, 116024, Dalian, China
| | - Yvlin Li
- School of Bioengineering & Key Laboratory of Protein Modification and Disease, Liaoning Province, Dalian University of Technology, 116024, Dalian, China
| | - Linlin Lv
- School of Bioengineering & Key Laboratory of Protein Modification and Disease, Liaoning Province, Dalian University of Technology, 116024, Dalian, China
| | - Ping Ren
- The Second Hospital of Dalian Medical University, 116000, Dalian, China.
| | - Huijian Wu
- School of Bioengineering & Key Laboratory of Protein Modification and Disease, Liaoning Province, Dalian University of Technology, 116024, Dalian, China.
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Biological Functions of the DNA Glycosylase NEIL3 and Its Role in Disease Progression Including Cancer. Cancers (Basel) 2022; 14:cancers14235722. [PMID: 36497204 PMCID: PMC9737245 DOI: 10.3390/cancers14235722] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/24/2022] [Revised: 11/16/2022] [Accepted: 11/16/2022] [Indexed: 11/24/2022] Open
Abstract
The accumulation of oxidative DNA base damage can severely disrupt the integrity of the genome and is strongly associated with the development of cancer. DNA glycosylase is the critical enzyme that initiates the base excision repair (BER) pathway, recognizing and excising damaged bases. The Nei endonuclease VIII-like 3 (NEIL3) is an emerging DNA glycosylase essential in maintaining genome stability. With an in-depth study of the structure and function of NEIL3, we found that it has properties related to the process of base damage repair. For example, it not only prefers the base damage of single-stranded DNA (ssDNA), G-quadruplex and DNA interstrand crosslinks (ICLs), but also participates in the maintenance of replication fork stability and telomere integrity. In addition, NEIL3 is strongly associated with the progression of cancers and cardiovascular and neurological diseases, is incredibly significantly overexpressed in cancers, and may become an independent prognostic marker for cancer patients. Interestingly, circNEIL3, a circular RNA of exon-encoded origin by NEIL3, also promotes the development of multiple cancers. In this review, we have summarized the structure and the characteristics of NEIL3 to repair base damage. We have focused on NEIL3 and circNEIL3 in cancer development, progression and prognosis.
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8
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Functional Screen for microRNAs Suppressing Anchorage-Independent Growth in Human Cervical Cancer Cells. Int J Mol Sci 2022; 23:ijms23094791. [PMID: 35563182 PMCID: PMC9100801 DOI: 10.3390/ijms23094791] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/23/2022] [Accepted: 04/21/2022] [Indexed: 02/04/2023] Open
Abstract
The progression of anchorage-dependent epithelial cells to anchorage-independent growth represents a critical hallmark of malignant transformation. Using an in vitro model of human papillomavirus (HPV)-induced transformation, we previously showed that acquisition of anchorage-independent growth is associated with marked (epi)genetic changes, including altered expression of microRNAs. However, the laborious nature of the conventional growth method in soft agar to measure this phenotype hampers a high-throughput analysis. We developed alternative functional screening methods using 96- and 384-well ultra-low attachment plates to systematically investigate microRNAs regulating anchorage-independent growth. SiHa cervical cancer cells were transfected with a microRNA mimic library (n = 2019) and evaluated for cell viability. We identified 84 microRNAs that consistently suppressed growth in three independent experiments. Further validation in three cell lines and comparison of growth in adherent and ultra-low attachment plates yielded 40 microRNAs that specifically reduced anchorage-independent growth. In conclusion, ultra-low attachment plates are a promising alternative for soft-agar assays to study anchorage-independent growth and are suitable for high-throughput functional screening. Anchorage independence suppressing microRNAs identified through our screen were successfully validated in three cell lines. These microRNAs may provide specific biomarkers for detecting and treating HPV-induced precancerous lesions progressing to invasive cancer, the most critical stage during cervical cancer development.
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Hu B, Yuan J. Effect of circPUM1 on radioresistance of cervical cancer cells through targeting miR-144-3p. Zhejiang Da Xue Xue Bao Yi Xue Ban 2022; 51:215-224. [PMID: 36161300 PMCID: PMC9353637 DOI: 10.3724/zdxbyxb-2022-0021] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/27/2022] [Accepted: 04/10/2022] [Indexed: 06/16/2023]
Abstract
OBJECTIVE To investigate the effect of circular RNA pumilio RNA binding family member (circPUM) 1 on radioresistance of cervical cancer cells and its mechanism. METHODS Cancer tissue and corresponding paricancerous tissue samples were collected from 47 patients with cervical cancer who underwent surgical treatment in the Second Affiliated Hospital of Zhengzhou University from August 2019 to February 2020. The expression levels of circPUM1 and miR-144-3p in cervical cancer tissues and paricancerous tissues were detected by quantitative reverse transcription polymerase chain reaction (qRT-PCR). The Pearson method was used to analyze the correlation between circPUM1 and miR-144-3p expression in cervical cancer tissues. circPUM1 lentiviral short hairpin RNA (sh-circPUM1) and its negative control (sh-NC), miR-144-3p oligonucleotide mimic (miR-144-3p mimic) and its negative control (miR-NC), sh-circPUM1 and miR-144-3p inhibitor (anti-miR), and sh-circPUM1 and anti-miR negative control (anti-miR-NC) were transfected into human cervical carcinoma SiHa cells, respectively, and the cells were irradiated with 0 and 4 Gy irradiation doses. Cell proliferation, colony formation, apoptosis, migration and invasion were detected by cell counting kit (CCK-8 method), plate colony formation assay, flow cytometry and Transwell assay, respectively. The protein expression of cleaved-caspase3 was detected by Western blotting. The targeting relationship between circPUM1 and miR-144-3p was analyzed with Starbase platform. RESULTS Compared with adjacent tissue, the expression of circPUM1 in cervical cancer tissue was significantly increased ( P<0.05), while the expression of miR-144-3p was decreased ( P<0.05). The circPUM1 was negatively correlated with miR-144-3p ( r=-0.9282, P<0.01). After transfection with sh-circPUM1 or miR-144-3p mimic, the inhibition rate of cell proliferation, the rate of apoptosis and the expression level of cleaved-caspase3 protein increased (all P<0.05), while the number of colonies formed, migrated and invaded cells decreased (all P<0.05). CircPUM1 could targeted to miR-144-3p. After co-transfection of sh-circPUM1 and anti-miR, the inhibition rate of cell proliferation, the rate of apoptosis and the expression level of cleaved-caspase3 protein significantly decreased (all P<0.05), while the number of colonies formed, migrated and invaded cells increased (all P<0.05). CONCLUSION Silencing circPUM1 may inhibit the proliferation, colony formation, migration, invasion and induce apoptosis of cervical cancer cells through targeting and regulating the expression of miR-144-3p.
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Affiliation(s)
- Bin Hu
- 1. Department of Gynecology, the Second Affiliated Hospital of Zhengzhou University, Zhengzhou 450000, China
| | - Jinjin Yuan
- 2. Department of Radiotherapy, the Second Affiliated Hospital of Zhengzhou University, Zhengzhou 450000, China
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Chen H, Wu C, Luo L, Wang Y, Peng F. circ_0000467 promotes the proliferation, metastasis, and angiogenesis in colorectal cancer cells through regulating KLF12 expression by sponging miR-4766-5p. Open Med (Wars) 2021; 16:1415-1427. [PMID: 34616917 PMCID: PMC8464181 DOI: 10.1515/med-2021-0358] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/13/2020] [Revised: 08/27/2021] [Accepted: 08/27/2021] [Indexed: 12/14/2022] Open
Abstract
Background Circular RNAs have been identified as crucial players in the initiation and progression of cancers, including colorectal cancer (CRC). The Has_circ_0000467 (circ_0000467) expression has been found to be upregulated in CRC, but its function and mechanism remain unclear. Methods The expression levels of circ_0000467, microRNA-4766-5p (miR-4766-5p), and Krueppel-like factor 12 (KLF12) were examined using reverse transcription-quantitative polymerase chain reaction. Cell proliferation was analyzed by cell counting kit-8 assay and colony formation assay. The apoptosis was measured by flow cytometry. Transwell migration and invasion assays were applied to evaluate cell metastatic ability. Angiogenesis was detected using tube formation assay. All protein expressions were quantified by western blot assay. Dual-luciferase reporter assay was used to analyze intergenic binding. Xenograft models were constructed for the experiment of circ_0000467 in vivo. Results The expression of circ_0000467 was upregulated in CRC tissues and cells. Knockdown of circ_0000467 repressed cell proliferation, metastasis, and angiogenesis, but it induced apoptosis in CRC cells. circ_0000467 targeted miR-4766-5p and inhibited the expression of miR-4766-5p. Silencing of circ_0000467 inhibited CRC progression by upregulating miR-4766-5p. miR-4766-5p suppressed the expression of target gene KLF12 and KLF12 overexpression reversed the effects of miR-4766-5p on CRC cell behaviors. circ_0000467 positively regulated the expression of KLF12 by targeting miR-4766-5p. circ_0000467 downregulation in vivo reduced CRC tumorigenesis by regulating miR-4766-5p and KLF12. Conclusion circ_0000467 acted as an oncogene in CRC through regulating KLF12 expression by sponging miR-4766-5p. Therefore, circ_0000467 can be used as an effective target in CRC diagnosis and therapy.
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Affiliation(s)
- Hui Chen
- Department of Gastroenterology and General Surgery, Sichuan Mianyang 404 Hospital, 621000, Mianyang, Sichuan, China
| | - Chen Wu
- Department of Gastroenterology and General Surgery, Sichuan Mianyang 404 Hospital, 621000, Mianyang, Sichuan, China
| | - Liang Luo
- Department of Gastroenterology and General Surgery, Sichuan Mianyang 404 Hospital, 621000, Mianyang, Sichuan, China
| | - Yuan Wang
- Department of Pediatric Infectious Diseases, Sichuan Mianyang 404 Hospital, 621000, Mianyang, China
| | - Fangxing Peng
- Department of Gastroenterology and General Surgery, Sichuan Mianyang 404 Hospital, No. 56, Yuejin Street, Fucheng District, 621000, Mianyang, Sichuan, China
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11
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Xie Y, Hang X, Xu W, Gu J, Zhang Y, Wang J, Zhang X, Cao X, Zhan J, Wang J, Gan J. CircFAM13B promotes the proliferation of hepatocellular carcinoma by sponging miR-212, upregulating E2F5 expression and activating the P53 pathway. Cancer Cell Int 2021; 21:410. [PMID: 34348712 PMCID: PMC8335894 DOI: 10.1186/s12935-021-02120-6] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/21/2021] [Accepted: 07/28/2021] [Indexed: 12/29/2022] Open
Abstract
Background Most of the biological functions of circular RNAs (circRNAs) and the potential underlying mechanisms in hepatocellular carcinoma (HCC) have not yet been discovered. Methods In this study, using circRNA expression data from HCC tumor tissues and adjacent tissues from the Gene Expression Omnibus database, we identified out differentially expressed circRNAs and verified them by qRT-PCT. Functional experiments were performed to evaluate the effects of circFAM13B in HCC in vitro and in vivo. Results We found that circFAM13B was the most significantly differentially expressed circRNA in HCC tissue. Subsequently, in vitro and in vivo studies also demonstrated that circFAM13B promoted the proliferation of HCC. Further studies revealed that circFAM13B, a sponge of miR-212, is involved in the regulation of E2F5 gene expression by competitively binding to miR-212, inhibits the activation of the P53 signalling pathway, and promotes the proliferation of HCC cells. Conclusions Our findings revealed the mechanism underlying the regulatory role played by circFAM13B, miR-212 and E2F5 in HCC. This study provides a new theoretical basis and novel target for the clinical prevention and treatment of HCC. Supplementary Information The online version contains supplementary material available at 10.1186/s12935-021-02120-6.
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Affiliation(s)
- Ying Xie
- Department of Infectious Disease, The First Affiliated Hospital of Soochow University, 188 Shizi street, Suzhou, 215000, China.,Department of Infectious Disease, Changzheng Hospital, Naval Medical University, 415 Fengyang street, Shanghai, 200003, China
| | - Xiaofeng Hang
- Department of Infectious Disease, Changzheng Hospital, Naval Medical University, 415 Fengyang street, Shanghai, 200003, China
| | - Wensheng Xu
- Department of Infectious Disease, Changzheng Hospital, Naval Medical University, 415 Fengyang street, Shanghai, 200003, China
| | - Jing Gu
- Department of Infectious Disease, The First Affiliated Hospital of Soochow University, 188 Shizi street, Suzhou, 215000, China
| | - Yuanjing Zhang
- Department of Infectious Disease, Changzheng Hospital, Naval Medical University, 415 Fengyang street, Shanghai, 200003, China
| | - Jianrong Wang
- Department of Infectious Disease, Changzheng Hospital, Naval Medical University, 415 Fengyang street, Shanghai, 200003, China
| | - Xiucui Zhang
- Department of Infectious Disease, Changzheng Hospital, Naval Medical University, 415 Fengyang street, Shanghai, 200003, China
| | - Xinghao Cao
- Department of Infectious Disease, Changzheng Hospital, Naval Medical University, 415 Fengyang street, Shanghai, 200003, China
| | - Junjie Zhan
- Department of Infectious Disease, Changzheng Hospital, Naval Medical University, 415 Fengyang street, Shanghai, 200003, China
| | - Junxue Wang
- Department of Infectious Disease, Changzheng Hospital, Naval Medical University, 415 Fengyang street, Shanghai, 200003, China.
| | - Jianhe Gan
- Department of Infectious Disease, The First Affiliated Hospital of Soochow University, 188 Shizi street, Suzhou, 215000, China.
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