Novel Treatments for PXE: Targeting the Systemic and Local Drivers of Ectopic Calcification.

Novel Treatments for PXE: Targeting the Systemic and Local Drivers of Ectopic Calcification.
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DOI:
10.3390/ijms242015041
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发表时间:
2023-10-10
影响因子:
5.6
通讯作者:
--
中科院分区:
生物学2区
文献类型:
--
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弹性纤维假黄瘤是一种遗传性多系统异位钙化疾病。负责PXE的基因ABCC 6编码ABCC 6,ABCC 6是一种调节细胞外无机焦磷酸盐(PPi)的肝外排转运蛋白,PPi是一种有效的内源性钙化抑制剂。最近的研究表明,除了血浆PPi的缺乏外,钙化组织中激活的DDR/PARP信号提供了PXE异位钙化的另一种可能机制。本研究检测了依替膦酸盐(ETD)(一种稳定的PPi类似物)及其与米诺环素(米诺)(一种有效的DDR/PARP抑制剂)的组合对Abcc 6-/-小鼠PXE模型中异位钙化的影响。Abcc 6-/-小鼠,在4周龄时,在异位钙化发生之前,用ETD、Mino或两者处理18周。微计算机断层扫描,组织病理学检查,并定量的钙含量在Abcc 6-/-小鼠治疗ETD和米诺显示进一步减少钙化比单独治疗。这些作用与血清碱性磷酸酶活性降低相关,而血浆PPi浓度无变化。这些结果表明,ETD和米诺联合治疗可能提供一个有效的治疗方法,PXE,目前难治性疾病。
Pseudoxanthoma elasticum (PXE) is a heritable multisystem ectopic calcification disorder. The gene responsible for PXE, ABCC6, encodes ABCC6, a hepatic efflux transporter regulating extracellular inorganic pyrophosphate (PPi), a potent endogenous calcification inhibitor. Recent studies demonstrated that in addition to the deficiency of plasma PPi, the activated DDR/PARP signaling in calcified tissues provides an additional possible mechanism of ectopic calcification in PXE. This study examined the effects of etidronate (ETD), a stable PPi analog, and its combination with minocycline (Mino), a potent inhibitor of DDR/PARP, on ectopic calcification in an Abcc6-/- mouse model of PXE. Abcc6-/- mice, at 4 weeks of age, before the development of ectopic calcification, were treated with ETD, Mino, or both for 18 weeks. Micro-computed tomography, histopathologic examination, and quantification of the calcium content in Abcc6-/- mice treated with both ETD and Mino revealed further reduced calcification than either treatment alone. The effects were associated with reduced serum alkaline phosphatase activity without changes in plasma PPi concentrations. These results suggest that ETD and Mino combination therapy might provide an effective therapeutic approach for PXE, a currently intractable disease.
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