Title:Bone Marrow Mesenchymal Stem Cell-derived Exosomal microRNA-99b-5p Promotes Cell Growth of High Glucose-treated Human Umbilical Vein Endothelial Cells by Modulating THAP Domain Containing 2 Expression
Volume: 19
Issue: 11
Author(s): Hongru Ruan, Hui Shi, Wenkang Luan and Sida Pan*
Affiliation:
- Department of Plastic Surgery,
Affiliated Huashan Hospital, Fudan University, Wulumuqi Street 12, Jingan District, Shanghai, 200000, China
Keywords:
Bone marrow, mesenchymal stem cell, high glucose, umbilical vein, endothelial cells, THAP domain.
Abstract:
Introduction: Bone marrow mesenchymal stem cell-derived exosomes (BMSC-exos)
may function as novel candidates for treating diabetic wounds due to their ability to promote angiogenesis.
Materials and Methods: This study investigated the effects of BMSC-exos on the growth and metastasis
of human umbilical vein endothelial cells (HUVECs) treated with high glucose (HG). The
exosomes were separated from BMSCs and identified. The cell phenotype was detected by 3-(4,5-
dimethylthiazol-2-yl)-2,5-diphenyl tetrazolium bromide and 5-ethynyl-2’-deoxyuridine, wound
healing, and transwell assays, while the number of tubes was measured via tube formation assay.
Result: The RNA and protein expression levels were studied using reverse transcription-quantitative
polymerase chain reaction and western blotting, whereas integration of microRNA-99b-5p
(miR-99b-5p) with THAP domain containing 2 (THAP2) was confirmed via dual-luciferase reporter
and RNA pull-down assays. Results of transmission electron microscopy, nanoparticle
tracking analysis, and laser scanning confocal microscopy revealed that exosomes were successfully
separated from BMSCs and endocytosed into the cytoplasm by HUVECs. Similarly, BMSC-exos
were found to promote the growth of HG-treated HUVECs, while their growth was inhibited
by suppressing miR-99b-5p. THAP2 was found to bind to miR-99b-5p, where THAP2 inhibition
reversed the miR-99b-5p-induced effects on cell growth, migration, and tube numbers.
Conclusion: In conclusion, miR-99b-5p in BMSC-exo protects HUVECs by negatively regulating
THAP2 expression.