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内皮素受体 B 和 BCL2A1 在黑色素瘤自发性中枢神经系统转移中的作用。

Roles for endothelin receptor B and BCL2A1 in spontaneous CNS metastasis of melanoma.

机构信息

Sunnybrook Research Institute, Department of Medical Biophysics, University of Toronto, Toronto, Ontario, Canada.

出版信息

Cancer Res. 2012 Oct 1;72(19):4909-19. doi: 10.1158/0008-5472.CAN-12-2194. Epub 2012 Aug 3.

Abstract

Metastatic spread of melanoma to the central nervous system (CNS) is a common and devastating manifestation of disease progression, which, despite its clinical importance, remains poorly understood with respect to underlying molecular mechanisms. Using a recently developed preclinical model of spontaneous melanoma CNS metastasis, we have identified alterations in expression of endothelin receptor B (EDNRB) as a potential factor that influences brain metastatic potential. Induced overexpression of this gene mediated enhanced overall metastatic disease, and resulted in an increased incidence of spontaneous CNS metastases. In contrast, the overexpression of other highlighted genes, such as BCL2A1, did not affect the incidence of CNS metastases but nevertheless appears to facilitate intracranial tumor growth. The prometastatic effect in the CNS associated with EDNRB appears to be mediated by the interaction with its ligands resulting in enhanced tumor cell proliferation and thus intracranial melanoma growth. That EDNRB contributes to melanoma metastasis is underscored by the fact that its therapeutic inhibition by the EDNRB-specific inhibitor A192621 translated into improved outcomes when treating mice with either visceral metastases or intracranial tumors. The identification of an influential role of EDNRB in CNS melanoma spontaneous metastasis may provide both a target for therapeutic intervention as well as a potential prognostic marker for patients having an increased predisposition for incidence of CNS melanoma metastases.

摘要

黑色素瘤向中枢神经系统(CNS)的转移是疾病进展的常见且具有破坏性的表现,尽管其具有重要的临床意义,但就潜在的分子机制而言,人们对此仍知之甚少。我们使用最近开发的自发性黑色素瘤 CNS 转移的临床前模型,发现内皮素受体 B(EDNRB)的表达改变可能是影响脑转移潜力的潜在因素。该基因的诱导过表达介导了整体转移性疾病的增强,并导致自发性 CNS 转移的发生率增加。相比之下,其他突出基因(如 BCL2A1)的过表达并不影响 CNS 转移的发生率,但似乎仍然有利于颅内肿瘤的生长。与 EDNRB 相关的 CNS 促转移作用似乎是通过与配体的相互作用介导的,导致肿瘤细胞增殖增强,从而导致颅内黑色素瘤生长。EDNRB 促进黑色素瘤转移的事实表明,其特异性抑制剂 A192621 的治疗抑制作用可改善治疗有内脏转移或颅内肿瘤的小鼠的治疗效果。确定 EDNRB 在 CNS 黑色素瘤自发性转移中的重要作用,可能为治疗干预提供一个靶点,并为具有 CNS 黑色素瘤转移高易感性的患者提供潜在的预后标志物。

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