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MicroRNA-126 Deficiency Affects the Development of Thymus CD4+ Single-Positive Cells through Elevating IRS-1
Lin Hu1,2, Hualin Xu1,2, Jia Lu1,2
1Special Key Laboratory of Gene Detection & Therapy of Guizhou Provincial Education Department, Zunyi, China.
Background:
MicroRNA-126 (miR-126), a distinct miRNA family member, has been reported to be involved in the development and function of some types of immune cells. However, the potential role of miR-126 in the development of CD4+ T cells remains to be elucidated.
Objectives:
To investigate the potential role of miR-126 in the development of CD4+ T cells in the thymus and explore its significance.
Methods:
The relative expression level of miR-126 in thymus CD4+ single-positive (SP) cells was detected by Real-Time PCR assay. The possible change in thymus tissue was assessed by histopathology. The total cell number of thymocytes and the expression of activation-associated molecules including CD62L, CD69, and CD44, as well as proliferation-associated nuclear antigen Ki-67, in CD4+ SP cells were assessed by flow cytometric analysis. The expression of IRS-1 and related signaling pathways including Akt and Erk were determined by flow cytometric analysis.
Results:
Compared with that in wild-type (WT) mice, the total cell number of thymocytes in miR-126 knockdown (KD) mice increased significantly. Moreover, the proportion and absolute cell number of thymic CD4+ SP cells decreased significantly in miR-126 KD mice. Further analysis showed that the frequencies of activation-associated molecules including CD62L, CD69, and CD44, as well as proliferation-associated nuclear antigen Ki-67 in CD4+ SP cells also changed significantly, respectively. Mechanism aspect, the expression level of IRS-1, a putative target of miR-126, increased significantly in CD4+ SP cells in miR-126 KD mice. Moreover, the expression levels of the signaling molecules phosphorylated (p)-Akt and p-Erk also changed significantly.
Conclusions:
Our work is the first to reveal a previously unknown role of miR-126 in the development of CD4+ SP cells in the thymus, which might ultimately benefit studies on development of thymocytes.
Insights
MicroRNA-126 (miR-126) plays a crucial role in CD4+ T cell development within the thymus. Its knockdown impacts thymocyte numbers and activation markers, affecting key signaling pathways like IRS-1, Akt, and Erk.
Area of Science:
- Immunology
- Molecular Biology
- Developmental Biology
Background:
- MicroRNA-126 (miR-126) is implicated in immune cell development.
- Its specific role in CD4+ T cell development in the thymus is not well understood.
Purpose of the Study:
- To investigate the function of miR-126 in CD4+ T cell development.
- To explore the significance of miR-126 in thymic T cell maturation.
Main Methods:
- Real-Time PCR to measure miR-126 expression in thymic CD4+ SP cells.
- Histopathology to assess thymus tissue changes.
- Flow cytometry to analyze thymocyte counts, CD4+ SP cell populations, activation markers (CD62L, CD69, CD44), proliferation (Ki-67), and signaling molecules (IRS-1, p-Akt, p-Erk).
Main Results:
- miR-126 knockdown (KD) in mice led to increased total thymocytes but decreased CD4+ SP cell numbers.
- Significant alterations in CD4+ SP cell activation and proliferation markers were observed in miR-126 KD mice.
- IRS-1 expression increased, and phosphorylated Akt and Erk levels changed in CD4+ SP cells of miR-126 KD mice.
Conclusions:
- This study reveals a novel role for miR-126 in CD4+ SP cell development within the thymus.
- Findings provide new insights into thymocyte development and may inform future research in the field.
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