Universidad Nacional de Córdoba, Facultad de Ciencias Químicas, Departamento de Bioquímica Clínica, Córdoba, Argentina.
62873Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Centro de Investigaciones en Bioquímica Clínica e Inmunología (CIBICI), Córdoba, Argentina.
ASN Neuro. 2022 Jan-Dec;14:17590914221136365. doi: 10.1177/17590914221136365.
Müller glial cells (MGCs), the main glial component of the retina, play an active role in retinal homeostasis during development and pathological processes. They strongly monitor retinal environment and, in response to retinal imbalance, activate neuroprotective mechanisms mainly characterized by the increase of glial fibrillary acidic protein (GFAP). Under these circumstances, if homeostasis is not reestablished, the retina can be severely injured and GFAP contributes to neuronal degeneration, as they occur in several proliferative retinopathies such as diabetic retinopathy, sickle cell retinopathy and retinopathy of prematurity. In addition, MGCs have an active participation in inflammatory responses releasing proinflammatory mediators and metalloproteinases to the extracellular space and vitreous cavity. MGCs are also involved in the retinal neovascularization and matrix extracellular remodeling during the proliferative stage of retinopathies. Interestingly, low-density lipoprotein receptor-related protein 1 (LRP1) and its ligand α-macroglobulin (αM) are highly expressed in MGCs and they have been established to participate in multiple cellular and molecular activities with relevance in retinopathies. However, the exact mechanism of regulation of retinal LRP1 in MGCs is still unclear. Thus, the active participation of MGCs and LRP1 in these diseases, strongly supports the potential interest of them for the design of novel therapeutic approaches. In this review, we discuss the role of LRP1 in the multiple MGCs activities involved in the development and progression of proliferative retinopathies, identifying opportunities in the field that beg further research in this topic area.MGCs and LRP1 are active players in injured retinas, participating in key features such as gliosis and neurotoxicity, neovascularization, inflammation, and glucose control homeostasis during the progression of ischemic diseases, such as proliferative retinopathies.
Müller 胶质细胞(MGC)是视网膜的主要胶质成分,在发育和病理过程中对视网膜内环境稳态发挥积极作用。它们强烈监测视网膜环境,并在视网膜失衡时激活主要表现为胶质纤维酸性蛋白(GFAP)增加的神经保护机制。在这些情况下,如果内环境稳态不能重建,视网膜可能会受到严重损伤,而 GFAP 有助于神经元变性,因为它们发生在几种增生性视网膜病变中,如糖尿病性视网膜病变、镰状细胞性视网膜病变和早产儿视网膜病变。此外,MGC 积极参与炎症反应,向细胞外空间和玻璃体腔释放促炎介质和金属蛋白酶。MGC 还参与增生性视网膜病变的视网膜新生血管形成和基质细胞外重塑。有趣的是,低密度脂蛋白受体相关蛋白 1(LRP1)及其配体α-巨球蛋白(αM)在 MGC 中高表达,并已确立参与与视网膜病变相关的多种细胞和分子活动。然而,LRP1 在 MGC 中的视网膜调控的确切机制尚不清楚。因此,MGC 和 LRP1 在这些疾病中的积极参与强烈支持它们在设计新型治疗方法方面的潜在意义。在这篇综述中,我们讨论了 LRP1 在 MGC 参与增生性视网膜病变的多种活动中的作用,确定了该领域中进一步研究这一课题的机会。MGC 和 LRP1 是受损视网膜中的活跃参与者,参与了增生性视网膜病变等缺血性疾病进展过程中的关键特征,如神经胶质增生和神经毒性、新生血管形成、炎症和葡萄糖控制内环境稳态。