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Three-Dimensional Bone Extracellular Matrix Model for Osteosarcoma
Published on: April 12, 2019
Expression of miR-29 and STAT3 in osteosarcoma and its effect on proliferation regulation of osteosarcoma cells
1Department of Orthopedics, the Fifth Hospital of Wuhan, Wuhan, Hubei, China. dingliao8482624@126.com.
Objective:
STAT3 has been shown to be involved in the occurrence, progression, and resistance of various tumors. The abnormal expression of miR-29 is associated with the pathogenesis of osteosarcoma. The bioinformatics analysis showed a targeting relationship between miR-29 and STAT3 3'-UTR. This study investigated whether miR-29 regulates the STAT3 expression and affects the proliferation and apoptosis of osteosarcoma cells.
Patients And Methods:
The tumor tissues of osteosarcoma patients were collected, and the adjacent tissues were used as controls to detect the expression of miR-29 and STAT3. The Dual-Luciferase Gene Reporter Assay validated the regulatory relationship between miR-29 and STAT3. The expression of miR-29 and STAT3 in normal osteoblasts hFOB1.19, osteosarcoma SJSA-1, and MG-63 was measured. SJSA-1 cells were divided into miR-NC group and miR-29 mimic group. Cell apoptosis and proliferation were detected by flow cytometry.
Results:
Compared with adjacent tissues, miR-29 expression was decreased, and STAT3 expression was increased in osteosarcoma. There was a targeted regulation relationship between miR-29 and STAT3. Compared with hFOB1.19 cells, miR-29 expression in osteosarcoma SJSA-1 and MG-63 cells was decreased, with increased STAT3 expression. The transfection of miR-29 mimic significantly decreased the expression of STAT3 and p-STAT3 in SJSA-1 cells, inhibited cell proliferation, and increased cell apoptosis.
Conclusions:
Decreased miR-29 expression plays a role in the increase of the STAT3 expression and in the promotion of the pathogenesis of osteosarcoma. Increasing the expression of miR-29 can inhibit the proliferation of osteosarcoma cells and promote apoptosis by decreasing STAT3 expression.
Insights
Decreased miR-29 expression is linked to increased STAT3 in osteosarcoma, promoting tumor growth. Enhancing miR-29 levels can inhibit osteosarcoma cell proliferation and boost apoptosis by reducing STAT3.
Area of Science:
- Molecular Biology
- Oncology
- Gene Regulation
Background:
- Signal transducer and activator of transcription 3 (STAT3) is implicated in various cancers.
- MicroRNA-29 (miR-29) dysregulation is associated with osteosarcoma development.
- Bioinformatics analysis suggests a direct targeting interaction between miR-29 and STAT3.
Purpose of the Study:
- To investigate the regulatory role of miR-29 on STAT3 expression in osteosarcoma.
- To determine the effect of miR-29 on osteosarcoma cell proliferation and apoptosis.
Main Methods:
- Analysis of miR-29 and STAT3 expression in osteosarcoma tissues versus adjacent tissues.
- Dual-Luciferase Reporter Assay to confirm the miR-29/STAT3 interaction.
- In vitro studies using osteosarcoma cell lines (SJSA-1, MG-63) and normal osteoblasts (hFOB1.19).
- Assessment of cell proliferation and apoptosis via flow cytometry following miR-29 mimic transfection.
Main Results:
- Osteosarcoma tissues exhibited lower miR-29 and higher STAT3 expression compared to adjacent tissues.
- A direct regulatory relationship between miR-29 and STAT3 was confirmed.
- Osteosarcoma cells showed reduced miR-29 and elevated STAT3 expression relative to normal osteoblasts.
- miR-29 mimic transfection in SJSA-1 cells led to decreased STAT3 and p-STAT3 levels, inhibited proliferation, and increased apoptosis.
Conclusions:
- Reduced miR-29 expression contributes to elevated STAT3 and osteosarcoma pathogenesis.
- Upregulating miR-29 shows potential therapeutic value by inhibiting osteosarcoma cell proliferation and promoting apoptosis through STAT3 downregulation.
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