目的:糖尿病性骨质疏松症(DOP)是最常见的继发性骨质疏松症。糖尿病影响骨代谢;然而,潜在的病理生理机制尚不清楚.凝集素样氧化低密度脂蛋白受体-1(LOX-1)的表达在以血管损伤为特征的条件下上调,比如动脉粥样硬化,高血压,和糖尿病。此外,缺口,HIF-1α,VEGF参与血管生成和骨形成。因此,我们旨在研究Notch的表达,HIF-1α,和VEGF处于LOX-1沉默状态。
方法:分离培养大鼠骨H型血管内皮细胞(THVECs)。使用CD31和Emcn的免疫荧光共表达进行细胞鉴定。利用基因重组技术构建靶向LOX-1的慢病毒沉默载体(LV-LOX-1),并将其转染到细胞中。实验组包括:NC组,HG组,LV-LOX-1组,LV-CON组,HG+LV-LOX-1组,HG+LV-CON组,HG+LV-LOX-1+FLI-06组,HG+LV-CON+FLI-06组,HG+LV-LOX-1+LW6组,HG+LV-CON+LW6组。LOX-1,缺口的水平,Hif-1α,用PCR和WB技术检测LOX-1和VEGF,研究高糖条件下LOX-1的表达是否在基因和蛋白水平上对下游分子有调节作用,以及所涉及的特定分子机制。
结果:高糖(HG)条件导致LOX-1表达显着增加,导致血管生成的抑制,而沉默LOX-1可以逆转这种现象。进一步分析揭示LOX-1的变化将促进Notch/HIF-1α和VEGF的变化。此外,Notch介导HIF-1α和VEGF的激活。
结论:THVECs中LOX-1的激活和Notch/HIF-1α/VEGF的抑制是DOP的主要原因。这些发现有助于我们了解DOP的发病机理,并为预防和治疗骨质疏松症提供了新的方法。
OBJECTIVE: Diabetic osteoporosis (DOP) is the most common secondary form of osteoporosis. Diabetes mellitus affects bone metabolism; however, the underlying pathophysiological mechanisms remain unclear. Lectin-like oxidized low-density lipoprotein receptor-1 (LOX-1) expression is upregulated in conditions characterized by vascular injury, such as atherosclerosis, hypertension, and diabetes. Additionally, Notch, HIF-1α, and VEGF are involved in angiogenesis and bone formation. Therefore, we aimed to investigate the expression of Notch, HIF-1α, and VEGF in the LOX-1 silencing state.
METHODS: Rat bone H-type vascular endothelial cells (THVECs) were isolated and cultured in vitro. Cell identification was performed using immunofluorescent co-expression of CD31 and Emcn. Lentiviral silencing vector (LV-LOX-1) targeting LOX-1 was constructed using genetic recombination technology and transfected into the cells. The experimental groups included the following: NC group, HG group, LV-LOX-1 group, LV-CON group, HG + LV-LOX-1 group, HG + LV-CON group, HG + LV-LOX-1 + FLI-06 group, HG + LV-CON + FLI-06 group, HG + LV-LOX-1 + LW6 group, and HG + LV-CON + LW6 group. The levels of LOX-1, Notch, Hif-1α, and VEGF were detected using PCR and WB techniques to investigate whether the expression of LOX-1 under high glucose conditions has a regulatory effect on downstream molecules at the gene and protein levels, as well as the specific molecular mechanisms involved.
RESULTS: High glucose (HG) conditions led to a significant increase in LOX-1 expression, leading to inhibition of angiogenesis, whereas silencing LOX-1 can reverse this phenomenon. Further analysis reveals that changes in LOX-1 will promote changes in Notch/HIF-1α and VEGF. Moreover, Notch mediates the activation of HIF-1α and VEGF.
CONCLUSIONS: The activation of LOX-1 and the inhibition of Notch/HIF-1α/VEGF in THVECs are the main causes of DOP. These findings contribute to our understanding of the pathogenesis of DOP and offer a novel approach for preventing and treating osteoporosis.