介酶干细胞外基因组通过miR-125b-5p/BTG2通路缓解缺血性心肌损伤
Lijun Luo1,2, Lieyou Li1,3, Shuyun Wu1,2
1Department of Cardiology, Fujian Cardiovascular Medical Center, Fujian Institute of Coronary Artery Disease, Fujian Medical University Union Hospital, Fuzhou, 350001, China.
Molecular and cellular biochemistry
|February 5, 2026
概括
骨髓介质干细胞衍生的外体细胞 (BMSC-Exos) 通过传递miR-125b-5p来保护心脏,该外体细胞准BTG2以减少心肌损伤. 这种微RNA转移减轻了炎症,纤维化和亡,改善了缺血事件后的心脏功能.
科学领域:
- 心血管生物学 心血管生物学
- 干细胞生物学 干细胞生物学
- 分子医学是分子医学.
- 异构体生物学 异构体生物学
背景情况:
- 骨髓介质干细胞衍生的外体细胞 (BMSC-Exos) 具有对心肌损伤的心脏保护性.
- 微RNAs (miRNAs) 是这些保护效应的关键媒介,但特定的miRNAs及其目标仍然需要完全阐明.
- 外体miR-125b-5p正在研究其在缺血性心肌损伤中的作用及其与B细胞转位基因2 (BTG2) 的相互作用.
研究的目的:
- 确定外体miR-125b-5p在减轻缺血性心肌损伤中的特定作用.
- 为了研究 miR-125b-5p 与其目标基因之间的调控相互作用,BTG2.
- 在心肌梗塞模型中评估携带miR-125b-5p的BMSC-Exos的治疗潜力.
主要方法:
- 鼠类BMSC转染生成miR-125b-5p-knockdown (KD) 外体和控制外体.
- 在体内研究:在小鼠中诱导心肌梗塞 (MI),然后在心肌内注射PBS,控制外体或miR-125b-5pKD-Exos.
- 试管体内研究:在低氧/缺乏血清 (HSD) 条件下用外体治疗HL-1细胞.
- 对亡,炎症,纤维化,心脏功能和BTG2表达的评估.
- 通过光显微镜证实使用DiD标记外体的外体吸收.
- 双露西法酶记者试验验证了miR-125b-5p/BTG2的相互作用.
主要成果:
- 与PBS相比,对照外体显著缓解炎症反应,抑制心脏纤维化,改善心脏功能 (排泄分数和分数缩短) 在MI小鼠中.
- 控制外基因组减少了心肌细胞的亡,无论是体内还是体外.
- 使用对照外体的治疗导致BTG2表达的下调.
- 在外体体中对miR-125b-5p的抑制减弱了这些保护作用.
- 双露西法酶测定证实BTG2是miR-125b-5p的直接目标.
- 被DiD标记的外体被缺血性心肌和HL-1细胞有效地吸收.
结论:
- BMSC-Exos对缺血性心肌损伤产生心脏保护作用.
- 外体miR-125b-5p通过向BTG2.2在调解这些保护作用方面发挥着至关重要的作用.
- BMSC-Exos将miR-125b-5p转移到心肌细胞,从而减少细胞亡,炎症和纤维化,并改善心脏功能.
相关概念视频
Mesenchymal Stem Cells
5.6K
Mesenchymal stem cells (MSCs) are adult stem cells that can differentiate into most connective tissue cell types, except for hematopoietic cells, depending upon the source of MSCs. For example, bone-marrow-derived MSCs (BM-MSCs) can differentiate into osteocytes, hepatocytes, and pancreatic and neuronal cells. MSCs can be isolated from various sources such as bone marrow, placenta, adipose tissue, teeth, and Wharton’s jelly, a gelatinous substance in the umbilical cord. The ease of their...
5.6K
Adult Stem Cells
33.9K
Stem cells are undifferentiated cells that divide and produce more stem cells or progenitor cells that differentiate into mature, specialized cell types. All the cells in the body are generated from stem cells in the early embryo, but small populations of stem cells are also present in many adult tissues including the bone marrow, brain, skin, and gut. These adult stem cells typically produce the various cell types found in that tissue—to replace cells that are damaged or to continuously...
33.9K
Embryonic Stem Cells
32.5K
Embryonic stem (ES) cells are undifferentiated pluripotent cells, meaning they can produce any cell type in the body. This gives them tremendous potential in science and medicine since they can generate specific cell types for use in research or to replace body cells lost due to damage or disease.
32.5K
Embryonic Stem Cells
5.1K
Embryonic stem (ES) cells were first discovered in mice in 1981 by Martin Evans. In 1998, James Thomson identified a method to isolate embryonic stem cells from humans. Human embryonic stem cells (hESCs) are obtained from 3-5 day old embryos that remain unused after an in vitro fertilization procedure.
ES cells are grown in a culture medium where they can divide indefinitely, creating ES cell lines. Under certain conditions, ES cells can differentiate, either spontaneously into a variety of...
ES cells are grown in a culture medium where they can divide indefinitely, creating ES cell lines. Under certain conditions, ES cells can differentiate, either spontaneously into a variety of...
5.1K
C4 Pathway and CAM
49.2K
Most plants use the C3 pathway for carbon fixation. However, some plants, such as sugar cane, corn, and cacti that grow in hot conditions, use alternative pathways to fix carbon and conserve energy loss due to photorespiration. Photorespiration is the process that occurs when the oxygen concentration is high. Under such conditions, the rubisco enzyme in the Calvin cycle binds O2 instead of CO2, which halts photosynthesis and consumes energy.
C4 Pathway
The C4 pathway is used by plants such as...
C4 Pathway
The C4 pathway is used by plants such as...
49.2K
Induced Pluripotent Stem Cells
28.1K
Stem cells are undifferentiated cells that divide and produce different types of cells. Ordinarily, cells that have differentiated into a specific cell type are post-mitotic—that is, they no longer divide. However, scientists have found a way to reprogram these mature cells so that they “de-differentiate” and return to an unspecialized, proliferative state. These cells are also pluripotent like embryonic stem cells—able to produce all cell types—and are therefore...
28.1K


