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Huang L, Huang J, Tang N, Xue H, Lin S, Liu S, Chen Q, Lu Y, Liang Q, Wang Y, Zhu Q, Zheng G, Chen Y, Zhu C, Chen C. Insufficient phosphorylation of STAT5 in Tregs inhibits the expression of BLIMP-1 but not IRF4, reduction the proportion of Tregs in pediatric aplastic anemia. Heliyon 2024; 10:e26731. [PMID: 38486772 PMCID: PMC10938128 DOI: 10.1016/j.heliyon.2024.e26731] [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: 09/22/2023] [Revised: 02/19/2024] [Accepted: 02/19/2024] [Indexed: 03/17/2024] Open
Abstract
Deficiency in regulatory T cells (Tregs) is an important mechanism underlying the pathogenesis of pediatric aplastic anemia, but its specific mechanism is unclear. In our study, we aimed to investigate whether IL-2/STAT5 can regulate the proliferation of Tregs in aplastic anemia (AA) by regulating their expression of B lymphocyte-induced mature protein-1 (BLIMP-1) or interferon regulatory factor 4 (IRF4). Through clinical research and animal experiments, we found that poor activation of the IL-2/STAT5 signaling pathway may leads to low expression of BLIMP-1 in Tregs of children with AA, which leads to defects in the differentiation and proliferation of Tregs in AA. In AA model mice, treatment with IL-2c reversed the decrease in Treg proportions and reduction in Blimp-1 expression in Tregs by increasing the phosphorylation of Stat5 in Tregs. In AA, deficiency of IRF4 expression in Tregs is closely related to the deficiency of Tregs, but is not regulated by the IL-2/STAT5 pathway.
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Affiliation(s)
- Lifen Huang
- Pediattic Hematology Laboratory, Division of Hematology/Oncology, Department of Pediatrics, The Seventh Affifiliated Hospital, Sun Yat-sen University, 518107, Shenzhen, Guangdong, China
| | - Junbin Huang
- Pediattic Hematology Laboratory, Division of Hematology/Oncology, Department of Pediatrics, The Seventh Affifiliated Hospital, Sun Yat-sen University, 518107, Shenzhen, Guangdong, China
| | - Nannan Tang
- Pediattic Hematology Laboratory, Division of Hematology/Oncology, Department of Pediatrics, The Seventh Affifiliated Hospital, Sun Yat-sen University, 518107, Shenzhen, Guangdong, China
| | - Hongman Xue
- Pediattic Hematology Laboratory, Division of Hematology/Oncology, Department of Pediatrics, The Seventh Affifiliated Hospital, Sun Yat-sen University, 518107, Shenzhen, Guangdong, China
| | - Shaofen Lin
- Department of Pediatric Hematopathy, Sun Yat-Sen Memorial Hospital, Sun Yat-Sen University, 510000, Guangzhou, Guangdong, China
| | - Su Liu
- Pediattic Hematology Laboratory, Division of Hematology/Oncology, Department of Pediatrics, The Seventh Affifiliated Hospital, Sun Yat-sen University, 518107, Shenzhen, Guangdong, China
| | - Qihui Chen
- Department of Pediatric Hematopathy, Sun Yat-Sen Memorial Hospital, Sun Yat-Sen University, 510000, Guangzhou, Guangdong, China
| | - Yinsi Lu
- Department of Pathology, The Seventh Affifiliated Hospital, Sun Yat-sen University, 518107, Shenzhen, Guangdong, China
| | - Qian Liang
- Department of Pathology, The Seventh Affifiliated Hospital, Sun Yat-sen University, 518107, Shenzhen, Guangdong, China
| | - Yun Wang
- Department of Pathology, The Seventh Affifiliated Hospital, Sun Yat-sen University, 518107, Shenzhen, Guangdong, China
| | - Qingqing Zhu
- Department of Pathology, The Seventh Affifiliated Hospital, Sun Yat-sen University, 518107, Shenzhen, Guangdong, China
| | - Guoxing Zheng
- Department of Pathology, The Seventh Affifiliated Hospital, Sun Yat-sen University, 518107, Shenzhen, Guangdong, China
| | - Yun Chen
- Department of Pathology, The Seventh Affifiliated Hospital, Sun Yat-sen University, 518107, Shenzhen, Guangdong, China
| | - Chengming Zhu
- Department of Pathology, The Seventh Affifiliated Hospital, Sun Yat-sen University, 518107, Shenzhen, Guangdong, China
| | - Chun Chen
- Pediattic Hematology Laboratory, Division of Hematology/Oncology, Department of Pediatrics, The Seventh Affifiliated Hospital, Sun Yat-sen University, 518107, Shenzhen, Guangdong, China
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Adhikari S, Nayek K, Bandyopadhyay A, Mandal P. Implication of therapeutic outcomes associated with molecular characterization of paediatric aplastic anaemia. Biochem Biophys Rep 2021; 25:100899. [PMID: 33490648 PMCID: PMC7809188 DOI: 10.1016/j.bbrep.2020.100899] [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: 11/09/2020] [Revised: 12/22/2020] [Accepted: 12/22/2020] [Indexed: 11/19/2022] Open
Abstract
Objectives Severe aplastic anemia is characterized by a hypocellular bone marrow and peripheral cytopenia. Mesenchymal stem cells (MSCs) play a crucial role in haematopoietic stem cells (HSCs) development and the development of microenvironment suitable for hematopoiesis. Molecular characterization of telomere maintenance pathway and gene expression profiling of MSCs can be important for the therapeutic interventions among paediatric aplastic anaemia patients. Methods The study involved paediatric aplastic anaemia patients (n = 10) and age matched paediatric healthy donors (n = 8). Peripheral blood samples were collected from the individuals. Average leucocyte telomere length and gene expression of the telomere maintenance genes were determined by quantitative real time PCR. Microarray based gene expression profiles (GSE33812) of MSCs for five paediatric aplastic anaemia patients were analyzed compared to five healthy controls and the data was downloaded from the GEO database. Results The telomere length was significantly shorter among paediatric AA patients compared to age matched healthy donors. Interestingly, one subgroup (n = 2) of paediatric AA patients has moderate telomere length comparable to age matched healthy donors. Based on the gene expression analysis of telomere maintenance pathway, TERF2 was significantly downregulated among paediatric patients with shorter telomere length but not among paediatric patients with moderate telomere length. Gene expression profiling of MSCs revealed three differentially expressed genes (GAS2L3, MK167 and TMSB15A) among the patients and was associated with therapeutic outcome. Conclusion Telomere length estimation and gene expression patterns of the MSCs and telomere length maintenance pathway may serve as a potential biomarker and could be associated with therapeutic choice of paediatric aplastic anaemia patients. One subgroup of paediatric AA patients has moderate telomere length comparable to age matched healthy donors. TERF2 was differentially downregulated among paediatric patients with shorter telomere length. Differential downregulation of GAS2L3, MK167 and TMSB15A genes in MSCs among the patients with immunosuppressive therapy.
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Affiliation(s)
- Sarmistha Adhikari
- Biomedical Genetics Laboratory, Department of Zoology, The University of Burdwan, West Bengal, India
| | - Kaustav Nayek
- Department of Paediatric Medicine, Burdwan Medical College & Hospital, West Bengal, India
| | | | - Paramita Mandal
- Biomedical Genetics Laboratory, Department of Zoology, The University of Burdwan, West Bengal, India
- Corresponding author. Biomedical Genetics Laboratory, Department of Zoology, The University of Burdwan, Burdwan, 713104, West Bengal, India.
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