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Zhao B, Yin J, Ding L, Luo J, Luo J, Mu J, Pan S, Du J, Zhong Y, Zhang L, Liu L. SPAG6 regulates cell proliferation and apoptosis via TGF-β/Smad signal pathway in adult B-cell acute lymphoblastic leukemia. Int J Hematol 2024; 119:119-129. [PMID: 38147275 DOI: 10.1007/s12185-023-03684-x] [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: 03/10/2023] [Revised: 11/09/2023] [Accepted: 11/17/2023] [Indexed: 12/27/2023]
Abstract
Adult B-cell acute lymphoblastic leukemia (B-ALL) prognosis remains unsatisfactory, and searching for new therapeutic targets is crucial for improving patient prognosis. Sperm-associated antigen 6 (SPAG6), a member of the cancer-testis antigen family, plays an important role in tumors, especially hematologic tumors; however, it is unknown whether SPAG6 plays a role in adult B-ALL. In this study, we demonstrated for the first time that SPAG6 expression was up-regulated in the bone marrow of adult B-ALL patients compared to healthy donors, and expression was significantly reduced in patients who achieved complete remission (CR) after treatment. In addition, patients with high SPAG6 expression were older (≥ 35 years; P = 0.015), had elevated white blood cell counts (WBC > 30 × 109/L; P = 0.021), and a low rate of CR (P = 0.036). We explored the SPAG6 effect on cell function by lentiviral transfection of adult B-ALL cell lines BALL-1 and NALM-6, and discovered that knocking down SPAG6 significantly inhibited cell proliferation and promoted apoptosis. We identified that SPAG6 knockdown might regulate cell proliferation and apoptosis via the transforming growth factor-β (TGF-β)/Smad signaling pathway.
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Affiliation(s)
- Beibei Zhao
- Department of Hematology, Chongqing Medical University, Medical College Road, Yuzhong District, Chongqing, China
- Laboratory Research Center, The First Affiliated Hospital of Chongqing Medical University, Chongqing, 400042, China
| | - Jiaxiu Yin
- Department of Hematology, Chongqing Medical University, Medical College Road, Yuzhong District, Chongqing, China
- Laboratory Research Center, The First Affiliated Hospital of Chongqing Medical University, Chongqing, 400042, China
| | - Li Ding
- Department of Hematology, Chongqing Medical University, Medical College Road, Yuzhong District, Chongqing, China
- Laboratory Research Center, The First Affiliated Hospital of Chongqing Medical University, Chongqing, 400042, China
- Department of Hematology, The Affiliated Hospital of Southwest Medical University, Luzhou, 646000, Sichuan, People's Republic of China
| | - Jie Luo
- Department of Hematology, Chongqing Medical University, Medical College Road, Yuzhong District, Chongqing, China
- Laboratory Research Center, The First Affiliated Hospital of Chongqing Medical University, Chongqing, 400042, China
| | - Jing Luo
- Department of Hematology, Chongqing Medical University, Medical College Road, Yuzhong District, Chongqing, China
- Laboratory Research Center, The First Affiliated Hospital of Chongqing Medical University, Chongqing, 400042, China
| | - Jiao Mu
- Department of Hematology, Chongqing Medical University, Medical College Road, Yuzhong District, Chongqing, China
- Laboratory Research Center, The First Affiliated Hospital of Chongqing Medical University, Chongqing, 400042, China
| | - Shirui Pan
- Department of Hematology, Chongqing Medical University, Medical College Road, Yuzhong District, Chongqing, China
- Laboratory Research Center, The First Affiliated Hospital of Chongqing Medical University, Chongqing, 400042, China
| | - Juan Du
- Department of Hematology, The Affiliated Hospital of Southwest Medical University, Luzhou, 646000, Sichuan, People's Republic of China
| | - Yirui Zhong
- Department of Hematology, Chongqing Medical University, Medical College Road, Yuzhong District, Chongqing, China
| | - Linyi Zhang
- Department of Hematology, Chongqing Medical University, Medical College Road, Yuzhong District, Chongqing, China
| | - Lin Liu
- Department of Hematology, Chongqing Medical University, Medical College Road, Yuzhong District, Chongqing, China.
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Ding L, Luo J, Du J, Zhao B, Luo J, Pan S, Zhang L, Yan X, Li J, Liu L. Upregulated SPAG6 correlates with increased STAT1 and is associated with reduced sensitivity of interferon-α response in BCR::ABL1 negative myeloproliferative neoplasms. Cancer Sci 2023; 114:4445-4458. [PMID: 37681349 PMCID: PMC10637088 DOI: 10.1111/cas.15950] [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: 03/06/2023] [Revised: 08/06/2023] [Accepted: 08/16/2023] [Indexed: 09/09/2023] Open
Abstract
Sperm-associated antigen 6 (SPAG6) has been identified as an oncogene or tumor suppressor in various types of human cancer. However, the role of SPAG6 in BCR::ABL1 negative myeloproliferative neoplasms (MPNs) remains unclear. Herein, we found that SPAG6 was upregulated at the mRNA level in primary MPN cells and MPN-derived leukemia cell lines. The SPAG6 protein was primarily located in the cytoplasm around the nucleus and positively correlated with β-tubulin expression. In vitro, forced expression of SPAG6 increased cell clone formation and promoted G1 to S cell cycle progression. Downregulation of SPAG6 promoted apoptosis, reduced G1 to S phase transition, and impaired cell proliferation and cytokine release accompanied by downregulated signal transducer and activator of transcription 1 (STAT1) expression. Furthermore, the inhibitory effect of interferon-α (INF-α) on the primary MPN cells with high SPAG6 expression was decreased. Downregulation of SPAG6 enhanced STAT1 induction, thus enhancing the proapoptotic and cell cycle arrest effects of INF-α both in vitro and in vivo. Finally, a decrease in SPAG6 protein expression was noted when the STAT1 signaling was blocked. Chromatin immunoprecipitation assays indicated that STAT1 protein could bind to the SPAG6 promoter, while the dual-luciferase reporter assay indicated that STAT1 could promote the expression of SPAG6. Our results substantiate the relationship between upregulated SPAG6, increased STAT1, and reduced sensitivity to INF-α response in MPN.
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Affiliation(s)
- Li Ding
- Department of HematologyThe First Affiliated Hospital of Chongqing Medical UniversityChongqingChina
- Department of HematologyThe Affiliated Hospital of Southwest Medical UniversityLuzhouChina
| | - Jie Luo
- Department of HematologyThe First Affiliated Hospital of Chongqing Medical UniversityChongqingChina
| | - Juan Du
- Department of HematologyThe Affiliated Hospital of Southwest Medical UniversityLuzhouChina
| | - Beibei Zhao
- Department of HematologyThe First Affiliated Hospital of Chongqing Medical UniversityChongqingChina
| | - Jin Luo
- Department of HematologyThe First Affiliated Hospital of Chongqing Medical UniversityChongqingChina
| | - Shirui Pan
- Department of HematologyThe First Affiliated Hospital of Chongqing Medical UniversityChongqingChina
| | - Linyi Zhang
- Department of HematologyThe First Affiliated Hospital of Chongqing Medical UniversityChongqingChina
| | - Xinyu Yan
- Department of HematologyThe First Affiliated Hospital of Chongqing Medical UniversityChongqingChina
| | - Junnan Li
- Department of HematologyThe First Affiliated Hospital of Chongqing Medical UniversityChongqingChina
| | - Lin Liu
- Department of HematologyThe First Affiliated Hospital of Chongqing Medical UniversityChongqingChina
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Mu J, Yuan P, Luo J, Chen Y, Tian Y, Ding L, Zhao B, Wang X, Wang B, Liu L. Upregulated SPAG6 promotes acute myeloid leukemia progression through MYO1D that regulates the EGFR family expression. Blood Adv 2022; 6:5379-5394. [PMID: 35667090 PMCID: PMC9631693 DOI: 10.1182/bloodadvances.2021006920] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/27/2021] [Accepted: 06/02/2022] [Indexed: 11/20/2022] Open
Abstract
Chromosomal aberrations and gene mutations have been considered to be the major reasons for high recurrence rates and poor survival among acute myeloid leukemia (AML) patients. However, the underlying molecular mechanism of AML gene mutation remains largely unclear. Here, we show that SPAG6 (sperm-associated antigen 6), one of the most markedly increased SPAG genes in AML, significantly contributed to the proliferation and migration of leukemic cells. SPAG6 was highly expressed in AML, and its upregulation was negatively correlated with the prognosis of the disease. In vitro, SPAG6 promoted the proliferation and migration of leukemia cells and promoted cell cycle progression from the G1 phase to the S phase. In vivo, low expression of SPAG6 reduced the proliferation and infiltration of leukemia cells and prolonged the survival of xenograft tumor mice. Furthermore, immunoprecipitation and mass spectrometry analysis showed that SPAG6 interacts with MYO1D (myosin 1D). Specifically, overexpression of SPAG6 promoted the translocation of MYO1D into the cell membrane, thus upgrading the expression level of the EGFR family and thereby promoting the progression of AML. Overall, our study found that SPAG6 combined with MYO1D and translocated MYO1D from the cytosol to the cytomembrane, which induced the PI3K (phosphoinositide 3-kinase)/AKT (protein kinase B) signaling and ERK (extracellular signal-regulated kinase) signaling pathway to regulate the growth and prognosis of AML. SPAG6 may become a new target gene for the treatment of AML.
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Affiliation(s)
- Jiao Mu
- Department of Hematology, and
- Laboratory Research Center, The First Affiliated Hospital of Chongqing Medical University, Chongqing, China
| | - Peng Yuan
- Department of Interventional Radiology and Pain Treatment, Tangdu Hospital, Air Force Medical University, Xi’an, China
| | - Jie Luo
- Department of Hematology, and
- Laboratory Research Center, The First Affiliated Hospital of Chongqing Medical University, Chongqing, China
| | - Yafan Chen
- Department of Human Movement Science, Xi’an Physical Education University, Xi’an, China
| | - Yiyuan Tian
- Department of Physiology, Medical College of Yan’an University, Yan’an, China; and
| | - Li Ding
- Department of Hematology, and
- Laboratory Research Center, The First Affiliated Hospital of Chongqing Medical University, Chongqing, China
| | - Beibei Zhao
- Department of Hematology, and
- Laboratory Research Center, The First Affiliated Hospital of Chongqing Medical University, Chongqing, China
| | - Xiaocheng Wang
- Center of Clinical Aerospace Medicine, School of Aerospace Medicine, Key Laboratory of Aerospace Medicine of Ministry of Education
- Department of Aviation Medicine, The First Affiliated Hospital, and
| | - Bao Wang
- Tangdu Hospital, Department of Neurosurgery, Air Force Medical University, Xi’an, China
| | - Lin Liu
- Department of Hematology, and
- Laboratory Research Center, The First Affiliated Hospital of Chongqing Medical University, Chongqing, China
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Bao Z, Zhu R, Fan H, Ye Y, Li T, Chai D. Aberrant expression of SPAG6 and NM23 predicts poor prognosis of human osteosarcoma. Front Genet 2022; 13:1012548. [PMID: 36199573 PMCID: PMC9527292 DOI: 10.3389/fgene.2022.1012548] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/05/2022] [Accepted: 08/30/2022] [Indexed: 11/13/2022] Open
Abstract
Objective: To investigate the expression and clinical significance of sperm-associated antigen 6 and NM23 proteins in human osteosarcoma.Methods: The specimens of conventional osteosarcoma with follow-up from 42 Chinese patients were analyzed in this study, and 12 cases of osteochondroma were considered controls. The expression of SPAG6 and NM23 was inspected using immunohistochemical staining, qRT-PCR, and Western blotting methods.Results: The positive expression rate of SPAG6 protein (71.43%) in 42 cases of osteosarcoma tissue was significantly higher than that (33.33%) in 12 cases of osteochondroma tissues (p < 0.05), while the positive rate of NM23 protein (35.71%) in osteosarcoma tissue was lower than that (58.33%) in osteochondroma tissue (p < 0.05). The mRNA and protein levels of SPAG6 were significantly higher than those of the adjacent normal tissues, while the expression of NM23 was lower in osteosarcoma tissues than that in the controls (p < 0.05 for all). There was a positive relationship between the expression of SPAG6 and pathological grade, metastasis, and Enneking stage (p < 0.05 for all). The overall survival rate of osteosarcoma patients with SPAG6 positive expression was significantly lower than that with SPAG6 negative expression. The relationship between the expression of NM23 and pathological grade, metastasis, and Enneking stage was negative (p < 0.05 for all). The overall survival rate of the osteosarcoma patients with NM23 positive expression was higher than that of the patients with NM23 negative expression (p < 0.05).Conclusion: Overexpression of SPAG6 and low expression of NM23 are negatively related to pathological grade, metastasis, and Enneking stage and prognosis of osteosarcoma patients. This suggested that SPAG6 and NM23 should be considered candidate prognostic biomarkers for patients with osteosarcoma.
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Affiliation(s)
- Zhengqi Bao
- Department of Orthopedics, The First Affiliated Hospital of Bengbu Medical University, Bengbu, China
- Anhui Province Key Laboratory of Tissue Transplantation, Bengbu Medical University, Bengbu, China
- *Correspondence: Zhengqi Bao, ; Tian Li, ; Damin Chai,
| | - Ruizhi Zhu
- Department of Orthopedics, The First Affiliated Hospital of Bengbu Medical University, Bengbu, China
| | - Huagang Fan
- Department of Orthopedics, The First Affiliated Hospital of Bengbu Medical University, Bengbu, China
| | - Yuchen Ye
- Department of Orthopedics, The First Affiliated Hospital of Bengbu Medical University, Bengbu, China
| | - Tian Li
- School of Basic Medicine, Fourth Military Medical University, Xi’an, China
- *Correspondence: Zhengqi Bao, ; Tian Li, ; Damin Chai,
| | - Damin Chai
- Department of Pathology, The First Affiliated Hospital of Bengbu Medical University, Bengbu, China
- *Correspondence: Zhengqi Bao, ; Tian Li, ; Damin Chai,
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Revealing key lncRNAs in cytogenetically normal acute myeloid leukemia by reconstruction of the lncRNA-miRNA-mRNA network. Sci Rep 2022; 12:4973. [PMID: 35322118 PMCID: PMC8942983 DOI: 10.1038/s41598-022-08930-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/10/2021] [Accepted: 03/14/2022] [Indexed: 11/09/2022] Open
Abstract
Cytogenetically normal acute myeloid leukemia (CN-AML) is a heterogeneous disease with different prognoses. Researches on prognostic biomarkers and therapy targets of CN-AML are still ongoing. Instead of protein-coding genes, more and more researches were focused on the non-coding RNAs especially long non-coding RNAs (lncRNAs) which may play an important role in the development of AML. Although a large number of lncRNAs have been found, our knowledge of their functions and pathological process is still in its infancy. The purpose of this research is to identify the key lncRNAs and explore their functions in CN-AML by reconstructing the lncRNA-miRNA-mRNA network based on the competitive endogenous RNA (ceRNA) theory. We reconstructed a global triple network based on the ceRNA theory using the data from National Center for Biotechnology Information Gene Expression Omnibus and published literature. According to the topological algorithm, we identified the key lncRNAs which had both the higher node degrees and the higher numbers of lncRNA-miRNA pairs and total pairs in the ceRNA network. Meanwhile, Gene Ontology (GO) and pathway analysis were performed using databases such as DAVID, KOBAS and Cytoscape plug-in ClueGO respectively. The lncRNA-miRNA-mRNA network was composed of 90 lncRNAs,33mRNAs,26 miRNAs and 259 edges in the lncRNA upregulated group, and 18 lncRNAs,11 mRNAs,6 miRNAs and 45 edges in the lncRNA downregulated group. The functional assay showed that 53 pathways and 108 GO terms were enriched. Three lncRNAs (XIST, TUG1, GABPB1-AS1) could possibly be selected as key lncRNAs which may play an important role in the development of CN-AML. Particularly, GABPB1-AS1 was highly expressed in CN-AML by both bioinformatic analysis and experimental verification in AML cell line (THP-1) with quantitative real-time polymerase chain reaction. In addition, GABPB1-AS1 was also negatively correlated with overall survival of AML patients. The lncRNA-miRNA-mRNA network revealed key lncRNAs and their functions in CN-AML. Particularly, lncRNA GABPB1-AS1 was firstly proposed in AML. We believe that GABPB1-AS1 is expected to become a candidate prognostic biomarker or a potential therapeutic target.
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Gu Y, Chu MQ, Xu ZJ, Yuan Q, Zhang TJ, Lin J, Zhou JD. Comprehensive analysis of SPAG1 expression as a prognostic and predictive biomarker in acute myeloid leukemia by integrative bioinformatics and clinical validation. BMC Med Genomics 2022; 15:38. [PMID: 35227274 PMCID: PMC8886923 DOI: 10.1186/s12920-022-01193-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/28/2021] [Accepted: 02/24/2022] [Indexed: 11/10/2022] Open
Abstract
Background Recently, an increasing number of studies have reported that sperm-associated antigen (SPAG) proteins play crucial roles in solid tumorigenesis, and may serve as potentially helpful biomarkers for cancer diagnosis and prognosis. However, very few studies systematically investigated the expression of SPAG family members and their clinical significance in acute myeloid leukemia (AML). Methods The expression of SPAGs and their prognostic significance in AML were determined by a systematic analysis on data gathered from public databases, and the results were validated in clinical samples. Results Using public data, we identified only increased SPAG1 expression negatively associated with survival in AML by Cox regression (P < 0.001) and Kaplan–Meier analysis (P < 0.001). The prognostic value of SPAG1 expression was further confirmed in other independent cohorts. Clinically, higher SPAG1 expression was significantly correlated with white blood cell counts (P = 0.014) and French–American–British (FAB) subtypes (P = 0.024). Moreover, higher SPAG1 expression was more common in + 8 patients (P = 0.034), rarely found with t(8;21) (P = 0.014), and correlated with FLT3 (P < 0.001) and DNMT3A mutations (P = 0.001). Despite these associations, multivariate analysis confirmed the independent prognostic value of SPAG1 expression in AML (P < 0.001). Notably, AML patients with higher SPAG1 expression may benefit from hematopoietic stem cell transplantation (HSCT), whereas patients with lower SPAG1 expression appeared less likely to benefit. Finally, we further validated that SPAG1 expression was significantly increased in newly diagnosed AML patients compared with normal controls (P < 0.001) and with AML patients who achieved complete remission (P < 0.001). Additionally, SPAG1 expression could act as a potentially helpful biomarker for the diagnosis and prognosis of AML (P < 0.001 and = 0.034, respectively). Conclusions Our findings demonstrated that SPAG1 overexpression may serve as an independent prognostic biomarker and may guide the choice between HSCT and chemotherapy in patients with AML. Supplementary Information The online version contains supplementary material available at 10.1186/s12920-022-01193-0.
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Affiliation(s)
- Yu Gu
- Department of Hematology, Affiliated People's Hospital of Jiangsu University, 8 Dianli Rd., Zhenjiang, 212002, Jiangsu, People's Republic of China.,Zhenjiang Clinical Research Center of Hematology, Zhenjiang, 212002, Jiangsu, People's Republic of China.,The Key Lab of Precision Diagnosis and Treatment in Hematologic Malignancies of Zhenjiang City, Zhenjiang, 212002, Jiangsu, People's Republic of China
| | - Ming-Qiang Chu
- Laboratory Center, Affiliated People's Hospital of Jiangsu University, 8 Dianli Rd., Zhenjiang, 212002, Jiangsu, People's Republic of China
| | - Zi-Jun Xu
- Laboratory Center, Affiliated People's Hospital of Jiangsu University, 8 Dianli Rd., Zhenjiang, 212002, Jiangsu, People's Republic of China.,Zhenjiang Clinical Research Center of Hematology, Zhenjiang, 212002, Jiangsu, People's Republic of China.,The Key Lab of Precision Diagnosis and Treatment in Hematologic Malignancies of Zhenjiang City, Zhenjiang, 212002, Jiangsu, People's Republic of China
| | - Qian Yuan
- Department of Hematology, Affiliated People's Hospital of Jiangsu University, 8 Dianli Rd., Zhenjiang, 212002, Jiangsu, People's Republic of China.,Laboratory Center, Affiliated People's Hospital of Jiangsu University, 8 Dianli Rd., Zhenjiang, 212002, Jiangsu, People's Republic of China.,Zhenjiang Clinical Research Center of Hematology, Zhenjiang, 212002, Jiangsu, People's Republic of China.,The Key Lab of Precision Diagnosis and Treatment in Hematologic Malignancies of Zhenjiang City, Zhenjiang, 212002, Jiangsu, People's Republic of China
| | - Ting-Juan Zhang
- Zhenjiang Clinical Research Center of Hematology, Zhenjiang, 212002, Jiangsu, People's Republic of China. .,The Key Lab of Precision Diagnosis and Treatment in Hematologic Malignancies of Zhenjiang City, Zhenjiang, 212002, Jiangsu, People's Republic of China. .,Department of Oncology, Affiliated People's Hospital of Jiangsu University, 8 Dianli Rd., Zhenjiang, 212002, Jiangsu, People's Republic of China.
| | - Jiang Lin
- Laboratory Center, Affiliated People's Hospital of Jiangsu University, 8 Dianli Rd., Zhenjiang, 212002, Jiangsu, People's Republic of China. .,Zhenjiang Clinical Research Center of Hematology, Zhenjiang, 212002, Jiangsu, People's Republic of China. .,The Key Lab of Precision Diagnosis and Treatment in Hematologic Malignancies of Zhenjiang City, Zhenjiang, 212002, Jiangsu, People's Republic of China.
| | - Jing-Dong Zhou
- Department of Hematology, Affiliated People's Hospital of Jiangsu University, 8 Dianli Rd., Zhenjiang, 212002, Jiangsu, People's Republic of China. .,Zhenjiang Clinical Research Center of Hematology, Zhenjiang, 212002, Jiangsu, People's Republic of China. .,The Key Lab of Precision Diagnosis and Treatment in Hematologic Malignancies of Zhenjiang City, Zhenjiang, 212002, Jiangsu, People's Republic of China.
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Expression profiling of N 6-methyladenosine modified circRNAs in acute myeloid leukemia. Biochem Biophys Res Commun 2022; 601:137-145. [PMID: 35247767 DOI: 10.1016/j.bbrc.2022.02.087] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2022] [Revised: 02/22/2022] [Accepted: 02/22/2022] [Indexed: 11/23/2022]
Abstract
Acute myeloid leukemia (AML) is the most common acute leukemia in adults, associated with poor prognosis and easy relapse of disease. Circular RNAs (circRNAs) were detected to be m6A modified and the role of m6A circRNAs has been reported in other diseases including cancers, however, their role has not been elucidated in AML yet. In the present study, we aimed to investigate the expression profiling of m6A circRNAs in AML. We performed m6A circRNAs microarray analysis to identify differentially expressed m6A circRNAs in bone marrow samples from AML patients and healthy individuals (control). Furthermore, bioinformatics analysis predicted the potential functions and relevant pathways that may be associated with the m6A circRNAs. The circRNA m6A methylation levels were found to be positively associated with the circRNAs expression, suggesting circRNA m6A modification could contribute to circRNA regulation in AML. Further analysis demonstrated that circRNA m6A modification might influence the circRNA-miRNA-mRNA co-expression network that may contribute to the circRNA regulatory network in AML. Our findings provide evidence of the differential expression profile of m6A circRNAs in AML, and circRNA m6A modification may contribute to circRNA regulatory function in AML.
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Yap YT, Li W, Zhou Q, Haj-Diab S, Chowdhury DD, Vaishnav A, Harding P, Williams DC, Edwards BF, Strauss JF, Zhang Z. The Ancient and Evolved Mouse Sperm-Associated Antigen 6 Genes Have Different Biologic Functions In Vivo. Cells 2022; 11:336. [PMID: 35159146 PMCID: PMC8834003 DOI: 10.3390/cells11030336] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2021] [Revised: 01/10/2022] [Accepted: 01/12/2022] [Indexed: 01/09/2023] Open
Abstract
Sperm-associated antigen 6 (SPAG6) is the mammalian orthologue of Chlamydomonas PF16, an axonemal central pair protein involved in flagellar motility. In mice, two Spag6 genes have been identified. The ancestral gene, on mouse chromosome 2, is named Spag6. A related gene originally called Spag6, localized on mouse chromosome 16, evolved from the ancient Spag6 gene. It has been renamed Spag6-like (Spag6l). Spag6 encodes a 1.6 kb transcript consisting of 11 exons, while Spag6l encodes a 2.4 kb transcript which contains an additional non-coding exon in the 3'-end as well as the 11 exons found in Spag6. The two Spag6 genes share high similarities in their nucleotide and amino acid sequences. Unlike Spag6l mRNA, which is widely expressed, Spag6 mRNA expression is limited to a smaller number of tissues, including the testis and brain. In transfected mammalian cells, SPAG6/GFP is localized on microtubules, a similar localization as SPAG6L. A global Spag6l knockout mouse model was generated previously. In addition to a role in modulating the ciliary beat, SPAG6L has many unexpected functions, including roles in the regulation of ciliogenesis/spermatogenesis, hearing, and the immunological synapse, among others. To investigate the role of the ancient Spag6 gene, we phenotyped global Spag6 knockout mice. All homozygous mutant mice were grossly normal, and fertility was not affected in both males and females. The homozygous males had normal sperm parameters, including sperm number, motility, and morphology. Examination of testis histology revealed normal spermatogenesis. Testicular protein expression levels of selected SPAG6L binding partners, including SPAG16L, were not changed in the Spag6 knockout mice, even though the SPAG16L level was significantly reduced in the Spag6l knockout mice. Structural analysis of the two SPAG6 proteins shows that both adopt very similar folds, with differences in a few amino acids, many of which are solvent-exposed. These differences endow the two proteins with different functional characteristics, even though both have eight armadillo repeats that mediate protein-protein interaction. Our studies suggest that SPAG6 and SPAG6L have different functions in vivo, with the evolved SPAG6L protein being more important. Since the two proteins have some overlapping binding partners, SPAG6 could have functions that are yet to be identified.
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Affiliation(s)
- Yi Tian Yap
- Department of Physiology, School of Medicine, Wayne State University, Detroit, MI 48201, USA; (Y.T.Y.); (W.L.); (Q.Z.); (S.H.-D.)
| | - Wei Li
- Department of Physiology, School of Medicine, Wayne State University, Detroit, MI 48201, USA; (Y.T.Y.); (W.L.); (Q.Z.); (S.H.-D.)
| | - Qi Zhou
- Department of Physiology, School of Medicine, Wayne State University, Detroit, MI 48201, USA; (Y.T.Y.); (W.L.); (Q.Z.); (S.H.-D.)
- Department of Occupational and Environmental Medicine, School of Public Health, Wuhan University of Science and Technology, Wuhan 430060, China
| | - Sarah Haj-Diab
- Department of Physiology, School of Medicine, Wayne State University, Detroit, MI 48201, USA; (Y.T.Y.); (W.L.); (Q.Z.); (S.H.-D.)
| | - Dipanwita Dutta Chowdhury
- Department of Biochemistry, Microbiology & Immunology, School of Medicine, Wayne State University, Detroit, MI 48201, USA; (D.D.C.); (A.V.); (B.F.E.)
| | - Asmita Vaishnav
- Department of Biochemistry, Microbiology & Immunology, School of Medicine, Wayne State University, Detroit, MI 48201, USA; (D.D.C.); (A.V.); (B.F.E.)
| | - Pamela Harding
- Hypertension & Vascular Research Division, Henry Ford Health System, Detroit, MI 48201, USA;
| | - David C. Williams
- Department of Pathology and Laboratory Medicine, University of North Carolina at Chapel Hill, Chapel Hill, NC 27599, USA;
| | - Brian F. Edwards
- Department of Biochemistry, Microbiology & Immunology, School of Medicine, Wayne State University, Detroit, MI 48201, USA; (D.D.C.); (A.V.); (B.F.E.)
| | - Jerome F. Strauss
- Center for Research on Reproduction and Women’s Health, Department of Obstetrics and Gynecology, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA 19104, USA;
| | - Zhibing Zhang
- Department of Physiology, School of Medicine, Wayne State University, Detroit, MI 48201, USA; (Y.T.Y.); (W.L.); (Q.Z.); (S.H.-D.)
- The C.S. Mott Center for Human Growth and Development, Department of Obstetrics & Gynecology, Wayne State University, Detroit, MI 48201, USA
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Luo J, Mu J, Liu L. [Effects of SPAG6 silencing and decitabine treatment on apoptosis and phosphatase and tensin homolog methylation in SKM-1 cells]. ZHONGHUA XUE YE XUE ZA ZHI = ZHONGHUA XUEYEXUE ZAZHI 2021; 42:1005-1010. [PMID: 35045671 PMCID: PMC8770872 DOI: 10.3760/cma.j.issn.0253-2727.2021.12.007] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/03/2021] [Indexed: 11/06/2022]
Abstract
Objective: To investigate the effects of SPAG6 silencing and decitabine on apoptosis and phosphatase and tensin homolog (PTEN) methylation in SKM-1 cells in vitro and in vivo. Methods: SKM-1 cells were transfected with a lentiviral vector to silence the expression of SPAG6. Cell survival rate was detected by CCK8 after treatment with decitabine, and cell apoptosis was detected by flow cytometry. Protein expression and methylation of PTEN were detected using Western blot and merozoite surface protein (MSP) . An non-obese diabetic/severe combined inmunodeficiency disease (NOD/SCID) mice xenograft tumor model was established, and the apoptosis and PTEN expression of tumor tissue were observed through terminal deoxynucleotidyl transferase dUTP nick end labeling (TUNEL) and immunohistochemistry (IHC) , respectively. Results: After lentivirus transfection, SPAG6 in the interference group was silenced successfully. CCK8 results indicated that the cell survival rate of SKM-1 cells treated with decitabine decreased. Flow cytometry showed that the apoptosis rate of cells treated with decitabine [ (17.35±3.37) %] was higher than that of the untreated group (5.09%±2.06%) and the apoptosis rate of the SPAG6 silencing combined with the decitabine treatment group was the highest [ (36.34±4.00) %]. After treatment with decitabine, the expression of DNMT1 decreased, while the expression of PTEN increased, and the promoter methylation degree of PTEN also decreased. Moreover, the increased protein level caused by PTEN demethylation was the most obvious in the SPAG6 in the interference shRNA group treated with decitabine. In NOD/SCID mice, the tumor volume of the decitabine group was significantly smaller than that of the placebo group, and the tumor volume of the SPAG6 silencing combined with the decitabine treatment group was the smallest. Additionally, the apoptosis rate was the highest (the positive ratio was 3.57±0.48) . Conclusion: SPAG6 silencing may enhance the apoptosis level and the effect of PTEN demethylation in SKM-1 cells and enhance the antitumor effect of decitabine in the NOD/SCID xenograft mouse model.
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Affiliation(s)
- J Luo
- Department of Hematology, The First Affiliated Hospital of Chongqing Medical University, Chongqing 400016, China Experimental Research Center, Chongqing Medical University, Chongqing 400016, China
| | - J Mu
- Department of Hematology, The First Affiliated Hospital of Chongqing Medical University, Chongqing 400016, China Experimental Research Center, Chongqing Medical University, Chongqing 400016, China
| | - L Liu
- Department of Hematology, The First Affiliated Hospital of Chongqing Medical University, Chongqing 400016, China
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10
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Ding L, Luo J, Zhang JP, Wang J, Li ZQ, Huang J, Chai L, Mu J, Zhao B, Zhong YR, Zhang LY, Liu L. Aberrant expression of SPAG6 may affect the disease phenotype and serve as a tumor biomarker in BCR/ABL1-negative myeloproliferative neoplasms. Oncol Lett 2021; 23:10. [PMID: 34820009 PMCID: PMC8607346 DOI: 10.3892/ol.2021.13128] [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: 07/22/2021] [Accepted: 10/15/2021] [Indexed: 11/28/2022] Open
Abstract
Sperm-associated antigen 6 (SPAG6) is a newly identified cancer-testis antigen that has been revealed to contribute to the occurrence and development of various types of human cancer, such as ovarian, bladder, breast and lung cancer. However, to the best of our knowledge, the expression levels of SPAG6 in breakpoint cluster region (BCR)/ABL1-negative myeloproliferative neoplasms (MPNs) have not been investigated previously. Using reverse transcription-quantitative PCR and different tissue staining techniques, the present study revealed that SPAG6 was expressed by MPN cells, both at the mRNA and protein levels, and that nucleated erythroid precursors and megakaryocytes expressed the highest levels of SPAG6. In addition, SPAG6, which is known as a microtubule-associated protein, was found to exhibit nucleic, cytoplasmic or both cytoplasmic and nucleic subcellular localization patterns within the same patient or cell type; however, it did not always co-localize with β-tubulin. Furthermore, SPAG6 expression was revealed to be associated with fewer splenomegaly [P=0.015 for polycythemia vera (PV) and essential thrombocythemia (ET); and P=0.012 for primary myelofibrosis (PMF)] and myelofibrosis events (P=0.014 for PV and ET; and P=0.004 for PMF). In patients with PMF, upregulated expression levels of SPAG6 were also found to be associated with lower white blood cell counts (P=0.042) and lactate dehydrogenase levels (P=0.012), and higher hemoglobin levels (P=0.031) and platelet counts (P=0.025). In addition, the receiver operating characteristic curve analysis indicated that SPAG6 may be a potential biomarker for distinguishing MPN cases from healthy individuals. In conclusion, to the best of our knowledge, the present study is the first to report that aberrant SPAG6 expression may affect the disease phenotype and serve as a tumor biomarker in BCR/ABL1-negative MPNs.
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Affiliation(s)
- Li Ding
- Department of Hematology, The First Affiliated Hospital of Chongqing Medical University, Chongqing 400042, P.R. China.,Department of Hematology, The Affiliated Hospital of Southwest Medical University, Luzhou, Sichuan 646000, P.R. China
| | - Jie Luo
- Department of Hematology, The First Affiliated Hospital of Chongqing Medical University, Chongqing 400042, P.R. China
| | - Jing Ping Zhang
- Department of Hematology, The Affiliated Hospital of Southwest Medical University, Luzhou, Sichuan 646000, P.R. China
| | - Ji Wang
- Department of Hematology, The Affiliated Hospital of Southwest Medical University, Luzhou, Sichuan 646000, P.R. China
| | - Zhao Quan Li
- Department of Hematology, The First Affiliated Hospital of Chongqing Medical University, Chongqing 400042, P.R. China
| | - Juan Huang
- Department of Pathology, The Affiliated Hospital of Southwest Medical University, Luzhou, Sichuan 646000, P.R. China
| | - Li Chai
- Department of Pathology, The Affiliated Hospital of Southwest Medical University, Luzhou, Sichuan 646000, P.R. China
| | - Jiao Mu
- Department of Hematology, The First Affiliated Hospital of Chongqing Medical University, Chongqing 400042, P.R. China
| | - Beibei Zhao
- Department of Hematology, The First Affiliated Hospital of Chongqing Medical University, Chongqing 400042, P.R. China
| | - Yi Rui Zhong
- Department of Hematology, The First Affiliated Hospital of Chongqing Medical University, Chongqing 400042, P.R. China
| | - Lin Yi Zhang
- Department of Hematology, The First Affiliated Hospital of Chongqing Medical University, Chongqing 400042, P.R. China
| | - Lin Liu
- Department of Hematology, The First Affiliated Hospital of Chongqing Medical University, Chongqing 400042, P.R. China
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11
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Falkenberg LG, Beckman SA, Ravisankar P, Dohn TE, Waxman JS. Ccdc103 promotes myeloid cell proliferation and migration independent of motile cilia. Dis Model Mech 2021; 14:dmm048439. [PMID: 34028558 PMCID: PMC8214733 DOI: 10.1242/dmm.048439] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/24/2020] [Accepted: 03/31/2021] [Indexed: 01/01/2023] Open
Abstract
The pathology of primary ciliary dyskinesia (PCD) is predominantly attributed to impairment of motile cilia. However, PCD patients also have perplexing functional defects in myeloid cells, which lack motile cilia. Here, we show that coiled-coil domain-containing protein 103 (CCDC103), one of the genes that, when mutated, is known to cause PCD, is required for the proliferation and directed migration of myeloid cells. CCDC103 is expressed in human myeloid cells, where it colocalizes with cytoplasmic microtubules. Zebrafish ccdc103/schmalhans (smh) mutants have macrophages and neutrophils with reduced proliferation, abnormally rounded cell morphology and an inability to migrate efficiently to the site of sterile wounds, all of which are consistent with a loss of cytoplasmic microtubule stability. Furthermore, we demonstrate that direct interactions between CCDC103 and sperm associated antigen 6 (SPAG6), which also promotes microtubule stability, are abrogated by CCDC103 mutations from PCD patients, and that spag6 zebrafish mutants recapitulate the myeloid defects observed in smh mutants. In summary, we have illuminated a mechanism, independent of motile cilia, to explain functional defects in myeloid cells from PCD patients. This article has an associated First Person interview with the first author of the paper.
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Affiliation(s)
- Lauren G. Falkenberg
- Medical Scientist Training Program, University of Cincinnati College of Medicine, Cincinnati, OH 45267, USA
- Molecular and Developmental Biology Graduate Program, University of Cincinnati College of Medicine and Cincinnati Children's Hospital Medical Center, Cincinnati OH 45267, USA
- Molecular Cardiovascular Biology Division and Heart Institute, Cincinnati Children's Hospital Medical Center, Cincinnati, OH 45229, USA
| | - Sarah A. Beckman
- Molecular Cardiovascular Biology Division and Heart Institute, Cincinnati Children's Hospital Medical Center, Cincinnati, OH 45229, USA
| | - Padmapriyadarshini Ravisankar
- Molecular Cardiovascular Biology Division and Heart Institute, Cincinnati Children's Hospital Medical Center, Cincinnati, OH 45229, USA
| | - Tracy E. Dohn
- Molecular and Developmental Biology Graduate Program, University of Cincinnati College of Medicine and Cincinnati Children's Hospital Medical Center, Cincinnati OH 45267, USA
- Molecular Cardiovascular Biology Division and Heart Institute, Cincinnati Children's Hospital Medical Center, Cincinnati, OH 45229, USA
| | - Joshua S. Waxman
- Molecular Cardiovascular Biology Division and Heart Institute, Cincinnati Children's Hospital Medical Center, Cincinnati, OH 45229, USA
- Department of Pediatrics, University of Cincinnati College of Medicine, Cincinnati, OH 45267, USA
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12
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Luo J, Mu J, Zhang M, Zhao B, Liu L. SPAG6-silencing enhances decitabine-induced apoptosis and demethylation of PTEN in SKM-1 cells and in a xenograft mouse model. Leuk Lymphoma 2021; 62:2242-2252. [PMID: 33843428 DOI: 10.1080/10428194.2021.1913148] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
Myelodysplastic syndromes (MDS) are a group of malignant diseases that are characterized by disordered hematopoiesis with a high risk of transforming into leukemia. In the present study, SPAG6-knockdown and decitabine (DAC) treatment resulted in a decreased DNA methyltransferases and methyl-CpG-binding domain protein expression. In addition, DAC and LBH589 were shown to promote apoptosis in SKM-1 cells, and SPAG6-knockdown to enhance the pro-apoptotic effect of DAC. DAC could reduce PTEN methylation and increase PTEN expression in SKM-1 cells. SPAG6-knockdown and LBH589 treatment could increase DAC-mediated demethylation of PTEN promoter. Finally, a mouse model was constructed, and an enhanced efficacy of DAC following SPAG6-knockdown was confirmed in vivo. In conclusion, DAC-mediated apoptosis and PTEN promoter demethylation may be synergistically enhanced by SPAG6-silencing. Therefore, in the present study it was indicated that SPAG6 may be a potential target for demethylation therapy in MDS.
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Affiliation(s)
- Jie Luo
- Department of Hematology, The First Affiliated Hospital of Chongqing Medical University, Chongqing, China.,Laboratory Research Center, The First Affiliated Hospital of Chongqing Medical University, Chongqing, China
| | - Jiao Mu
- Department of Hematology, The First Affiliated Hospital of Chongqing Medical University, Chongqing, China.,Laboratory Research Center, The First Affiliated Hospital of Chongqing Medical University, Chongqing, China
| | - Meng Zhang
- Laboratory Research Center, The First Affiliated Hospital of Chongqing Medical University, Chongqing, China
| | - Beibei Zhao
- Department of Hematology, The First Affiliated Hospital of Chongqing Medical University, Chongqing, China
| | - Lin Liu
- Department of Hematology, The First Affiliated Hospital of Chongqing Medical University, Chongqing, China
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13
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Zhang R, Zhu H, Yuan Y, Wang Y, Tian Z. SPAG6 promotes cell proliferation and inhibits apoptosis through the PTEN/PI3K/AKT pathway in Burkitt lymphoma. Oncol Rep 2020; 44:2021-2030. [PMID: 33000212 PMCID: PMC7551011 DOI: 10.3892/or.2020.7776] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/18/2020] [Accepted: 08/25/2020] [Indexed: 12/25/2022] Open
Abstract
The main purpose of the present study was to elucidate the role of sperm‑associated antigen 6 (SPAG6) in the occurrence and development of Burkitt lymphoma (BL) and explore the underlying molecular mechanisms. A correlation was observed between the expression of SPAG6 and the prognosis of patients with lymphoma using The Cancer Genome Atlas (TCGA) database analysis. It was demonstrated that the levels of SPAG6 in BL cells were higher compared with that in IM‑9 cells by reverse transcription‑PCR and western blot assays. Moreover, silencing of SPAG6 significantly decreased proliferation and increased apoptosis of Daudi and Raji cells, whereas SPAG6 overexpression exerted the opposite effects on CA46 and NAMALWA cells. When investigating the possible mechanism, it was first observed that the level of phosphatase and tensin homolog (PTEN) protein was significantly increased, while that of phosphorylated (p‑)AKT protein was markedly reduced in the SPAG6‑knockdown group compared with the blank control group in Daudi and Raji cells by western blot analysis. It was further ascertained whether the phosphoinositide 3‑kinase (PI3K)/PTEN/protein kinase B (AKT) pathway mediates the effects of SPAG6 on cell proliferation and apoptosis, and the results demonstrated that silencing of SPAG6 suppressed the viability of Daudi and Raji cells, whereas PTEN knockdown using siRNA or SF1670 (a specific PTEN inhibitor) reversed the inhibitory effect on cell proliferation and the promoting effect on cell apoptosis induced by SPAG6 depletion in vitro as well as in vivo. These data revealed that SPAG6 may promote the proliferation and inhibit the apoptosis of BL cells via the PTEN/PI3K/AKT pathway. The results of the present study suggest that SPAG6 may play a key role in the progression of BL and may be of value as a predictive prognostic biomarker in patients with BL.
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Affiliation(s)
- Rongrong Zhang
- Department of Pediatrics, The Affiliated Huaian No. 1 People's Hospital of Nanjing Medical University, Huaian, Jiangsu 223300, P.R. China
| | - Haiyan Zhu
- Department of Pediatrics, The Affiliated Huaian No. 1 People's Hospital of Nanjing Medical University, Huaian, Jiangsu 223300, P.R. China
| | - Yufang Yuan
- Department of Pediatrics, The Affiliated Huaian No. 1 People's Hospital of Nanjing Medical University, Huaian, Jiangsu 223300, P.R. China
| | - Yun Wang
- Department of Pediatrics, The Affiliated Huaian No. 1 People's Hospital of Nanjing Medical University, Huaian, Jiangsu 223300, P.R. China
| | - Zhaofang Tian
- Department of Pediatrics, The Affiliated Huaian No. 1 People's Hospital of Nanjing Medical University, Huaian, Jiangsu 223300, P.R. China
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14
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Forgione MO, McClure BJ, Yeung DT, Eadie LN, White DL. MLLT10 rearranged acute leukemia: Incidence, prognosis, and possible therapeutic strategies. Genes Chromosomes Cancer 2020; 59:709-721. [PMID: 32720323 DOI: 10.1002/gcc.22887] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/02/2020] [Revised: 07/07/2020] [Accepted: 07/13/2020] [Indexed: 12/22/2022] Open
Abstract
Rearrangements of the MLLT10 gene occur in acute myeloid leukemia (AML) and acute lymphoblastic leukemia (ALL), most commonly T-lineage ALL (T-ALL), in patients of all ages. MLLT10 rearranged (MLLT10r) acute leukemia presents a complex diagnostic and therapeutic challenge due to frequent presentation of immature or mixed phenotype, and a lack of consensus regarding optimal therapy. Cases of MLLT10r AML or T-ALL bearing immature phenotype are at high risk of poor outcome, but the underlying molecular mechanisms and sensitivity to targeted therapies remain poorly characterized. This review addresses the incidence and prognostic significance of MLLT10r in acute leukemia, and how the aberrant gene expression profile of this disease can inform potential targeted therapeutic strategies. Understanding the underlying genomics of MLLT10r acute leukemia, both clinically and molecularly, will improve prognostic stratification and accelerate the development of targeted therapeutic strategies, to improve patient outcomes.
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Affiliation(s)
- Michelle O Forgione
- Cancer Program, Precision Medicine Theme, South Australian Health and Medical Research Institute (SAHMRI), Adelaide, South Australia, Australia
- Faculty of Science, School of Biological Sciences, University of Adelaide, Adelaide, South Australia, Australia
| | - Barbara J McClure
- Cancer Program, Precision Medicine Theme, South Australian Health and Medical Research Institute (SAHMRI), Adelaide, South Australia, Australia
- Faculty of Health and Medical Science, University of Adelaide, Adelaide, South Australia, Australia
| | - David T Yeung
- Cancer Program, Precision Medicine Theme, South Australian Health and Medical Research Institute (SAHMRI), Adelaide, South Australia, Australia
- Faculty of Health and Medical Science, University of Adelaide, Adelaide, South Australia, Australia
- Department of Haematology, Royal Adelaide Hospital, Adelaide, South Australia, Australia
| | - Laura N Eadie
- Cancer Program, Precision Medicine Theme, South Australian Health and Medical Research Institute (SAHMRI), Adelaide, South Australia, Australia
- Faculty of Health and Medical Science, University of Adelaide, Adelaide, South Australia, Australia
| | - Deborah L White
- Cancer Program, Precision Medicine Theme, South Australian Health and Medical Research Institute (SAHMRI), Adelaide, South Australia, Australia
- Faculty of Science, School of Biological Sciences, University of Adelaide, Adelaide, South Australia, Australia
- Faculty of Health and Medical Science, University of Adelaide, Adelaide, South Australia, Australia
- Australian Genomics Health Alliance (AGHA), The Murdoch Children's Research Institute, Parkville, Victoria, Australia
- Australian and New Zealand Children's Oncology Group (ANZCHOG), Hudson Institute, Clayton, Victoria, Australia
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15
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Zhang M, Luo J, Luo X, Liu L. SPAG6 silencing induces autophagic cell death in SKM-1 cells via the AMPK/mTOR/ULK1 signaling pathway. Oncol Lett 2020; 20:551-560. [PMID: 32537026 PMCID: PMC7291649 DOI: 10.3892/ol.2020.11607] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/29/2019] [Accepted: 03/06/2020] [Indexed: 02/06/2023] Open
Abstract
As a member of the cancer-testis antigen family, sperm-associated antigen 6 (SPAG6) has been reported to be associated with the pathogenesis of myelodysplastic syndromes (MDS). Previous studies have demonstrated that SPAG6 is upregulated in bone marrow from patients with MDS and MDS-transformed acute myeloid leukemia and that knockdown of SPAG6 expression levels suppressed proliferation and promote apoptosis and differentiation in SKM-1 cells. However, the association between SPAG6 and autophagy in SKM-1 cells remains unclear. Hence, the aim of the present study was to investigate this association and its underlying mechanism. The present study used a short hairpin RNA (shRNA) lentivirus to silence SPAG6 expression levels in SKM-1 cells and demonstrated that SPAG6 knockdown increased autophagy and apoptosis. Furthermore, pharmacologically inhibiting autophagy with chloroquine and 3-methyladenine decreased SPAG6 knockdown-mediated apoptosis, indicating that SPAG6 knockdown-mediated autophagy promoted apoptosis in SKM-1 cells. Additionally, compared with the expression levels in negative control-shRNA lentivirus-transfected SKM-1 cells, the protein expression levels of phosphorylated AMP-activated protein kinase (p-AMPK) and phosphorylated unc-51-like autophagy activating kinase 1 (p-ULK1) were upregulated, while phosphorylated mammalian target of rapamycin (p-mTOR) protein expression was downregulated in SPAG6-shRNA lentivirus-transfected cells. Moreover, inhibiting AMPK expression levels with Compound C, a specific inhibitor of AMPK, attenuated SPAG6 knockdown-induced autophagy and apoptosis, suggesting that AMPK-mediated autophagy enhanced the pro-apoptotic effect of SPAG6 knockdown in SKM-1 cells. Taken together, the results of the present study demonstrated that SPAG6 silencing triggered autophagy via regulation of the AMPK/mTOR/ULK1 signaling pathway, which further contributed to the apoptosis of SKM-1 cells induced by SPAG6 knockdown. Thus, the current results indicate that SPAG6 may be a potential therapeutic target against MDS, and that autophagy may represent a potential mechanism for the treatment of MDS.
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Affiliation(s)
- Meng Zhang
- Department of Hematology, The First Affiliated Hospital of Chongqing Medical University, Yuzhong, Chongqing 400016, P.R. China.,Laboratory Research Center, The First Affiliated Hospital of Chongqing Medical University, Yuzhong, Chongqing 400016, P.R. China
| | - Jie Luo
- Department of Hematology, The First Affiliated Hospital of Chongqing Medical University, Yuzhong, Chongqing 400016, P.R. China.,Laboratory Research Center, The First Affiliated Hospital of Chongqing Medical University, Yuzhong, Chongqing 400016, P.R. China
| | - Xiaohua Luo
- Department of Hematology, The First Affiliated Hospital of Chongqing Medical University, Yuzhong, Chongqing 400016, P.R. China
| | - Lin Liu
- Department of Hematology, The First Affiliated Hospital of Chongqing Medical University, Yuzhong, Chongqing 400016, P.R. China
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16
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The Emerging Role of Sperm-Associated Antigen 6 Gene in the Microtubule Function of Cells and Cancer. MOLECULAR THERAPY-ONCOLYTICS 2019; 15:101-107. [PMID: 31660426 PMCID: PMC6807308 DOI: 10.1016/j.omto.2019.08.011] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
Accumulated evidence shows that sperm-associated antigen 6 (SPAG6) gene has multiple biological functions. It maintains the normal function of a variety of cells including ciliary/flagellar biogenesis and polarization, neurogenesis, and neuronal migration. Moreover, SPAG6 is found to be critically involved in auditory transduction and the fibroblast life cycle. Furthermore, SPAG6 plays an essential role in immuno-regulation. Notably, SPAG6 has been demonstrated to participate in the occurrence and progression of a variety of human cancers. New evidence shows that SPAG6 gene regulates tumor cell proliferation, apoptosis, invasion, and metastasis. Therefore, in this review, we describe the physiological function and mechanism of SPAG6 in human normal cells and cancer cells. We also highlight that SPAG6 gene may be an effective biomarker for the diagnosis of human cancer. Taken together, targeting SPAG6 could be a novel strategy for the treatment of human diseases including cancer.
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