J Bone Miner Res:骨形成剂Romosozumab单抗治疗效果研究

2022-05-16 医路坦克 MedSci原创

Romosozumab是一种人源化单克隆抗体,为了确定绝经后妇女使用Romosozumab后骨形成的早期情况,我们分析了在第2个月骨活检标本,以评估松质骨、皮质内骨和骨膜表面相关指标

Romosozumab是一种人源化单克隆抗体,可与硬化素结合,硬化素是一种细胞外Wnt抑制剂,可防止Wnt配体与低密度脂蛋白受体相关蛋白(LRP) 5和6结合,并抑制经典Wnt信号通路的激活。硬化素的抑制因此导致典型Wnt信号的激活,其对骨具有双重作用,增加骨形成和减少骨吸收。在2期和3期临床试验中,骨形成标志物在治疗的前2个月最高,并在12个月的治疗后恢复到基线水平。相反,在12个月的治疗中,骨吸收标记物减少并保持不变。

为了确定绝经后妇女使用Romosozumab后骨形成的早期增加情况,我们分析了在第2个月从框架活检子研究中获得的骨活检,以评估松质骨、皮质内骨和骨膜表面的MBBF和重塑骨形成(RBBF)的程度。

3期框架试验(NCT01575834)的骨活检组织形态计量学分析显示,早期骨形成显著增加,伴随着吸收减少。临床前研究表明,大多数Romosozumab单抗治疗后的新骨形成是基于模型的骨形成(MBBF)。在这里,我们分析了帧中骨活检,以评估2个月的Romosozumab单抗与安慰剂对MBBF表面范围和基于重塑的骨形成(RBBF)的影响。

在框架内,≥55岁的绝经后骨质疏松妇女被随机分成两组,每月1:1~210mg Romosozumab或安慰剂sc,连续12个月,随后每6个月60mg denosumab sc,共12个月。骨活检亚研究的参与者接受了四环素标记,并在2个月时接受了暂时性活检。共有29例活检适合组织形态计量学。使用荧光显微镜,松质骨、皮质内和骨膜包膜的骨形成根据其下面的骨水泥线的外观被分类为模型化(平滑)或重塑(扇形)。数据比较使用Wilcoxon秩和检验,不进行多重性调整。

Romosozumab治疗患者的共聚焦髂骨活检图像。髂骨活检的共聚焦显微镜图像(原始放大倍数200X)显示左侧皮质内表面基于模型的骨形成(MBBF )(虚线=骨水泥线),以及右侧先前发生骨吸收的小梁骨表面基于重塑的骨形成(RBBF )(虚线=骨水泥线)。

 

结果:2个月后,在松质骨(18.0%比3.8%;p=0.005)和皮质内(36.7%比3.0%;p=0.001)上,Romosozumab单抗与安慰剂相比MBBF占整个骨表面的中位数显著增加,但在骨膜表面上(5.0%比2.0%;p=0.37),在所有三种骨表面上RBBF的表面积没有显著差异。

这些数据表明,在绝经后骨质疏松妇女中,Romosozumab单抗治疗前2个月的骨形成刺激主要是由于皮质内和松质层表面MBBF的增加所导致的。

文献来源:Eriksen EF,  Chapurlat R,  Boyce RW;Modeling-Based Bone Formation After 2 Months of Romosozumab Treatment: Results From the FRAME Clinical Trial.J Bone Miner Res 2022 01;37(1)

 

 

 

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    2022-11-03 apoenzyme
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    2022-11-29 snf701207
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