Browsing by Subject "Müller cells"

Now showing 1 - 4 of 4
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    Effect of diabetes blood-stasis syndrome and Xuefu Zhuyu decoction on ERK1/2-VEGF signal pathway in rat retina Müller cells
    (Universidad de Murcia, Departamento de Biologia Celular e Histiologia, 2022) Ye, Xiaofeng; Ren, Hui; Jiang, Tingting; Zhang, Ting; Li, Gang
    Aims. This research was aimed to investigate whether diabetic blood-stasis syndrome had a relationship with ERK1/2-VEGF signaling pathway in rat retina Müller cells and Traditional Chinese Drugs designed for promoting blood circulation to remove blood stasis had effectiveness for diabetic retinopathy (DR) treatment. Methods. Immunofluorescence was applied to determine purity of Müller cells. Müller cells were stimulated by blood serum obtained from rats with blood-stasis syndrome and then treated by Xuefu Zhuyu decoction. Western blot analysis, RT-PCR and ELISA were used to measure the expression of VEGF. Western blot analysis was used to determine the phosphorylation of ERK1/2. The status of AP-1 DNA binding activity was monitored by electrophoretic mobility shift assay (EMSA). Results. Stimulation of Müller cells by blood serum of rat with diabetic blood stasis increased the secretion of VEGF, activated ERK1/2 and AP-1 DNA-binding activity. And treatment of Xuefu Zhuyu decoction could weaken this phenomenon. What's more, ERK1/2 signaling pathway inhibitor U0126 also could inhibit the expression of VEGF. Conclusions. Diabetic blood-stasis syndrome in theory of traditional Chinese Medicine has positive role in regulating ERK1/2-VEGF signaling pathway. Traditional Chinese drugs for promoting blood circulation to remove blood stasis would be an effective therapy to treat DR.
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    Muller glia cells and their possible roles during retina differentiation in vivo and in vitro
    (Murcia : F. Hernández, 1998) Willbold, E.; Layer, P.G.
    Muller cells are astrocyte-like radial glia cells which are formed exclusively in the retina. Here we present evidence that Muller cells are crucially involved in the development of the retina's architecture and circuitry. There is increasing evidence that Muller cells are present from the very early beginning of retinogenesis. We postulate the "gradual maturation hypothesis of Muller cells". According to this hypothesis, Miiller cells are continuously generated by a gradual transition of neuroepithelial stem cells into mature Muller cells. This process may be partly reversible. Muller cells, or their immature precursors, are able to subserve different functions. They are primary candidates for stabilizing the complex retina1 architecture and for providing an orientation scaffold. Thereby, they introduce a reference system for the migration and correct allocation of neurons. Moreover, they may provide spatial information and microenvironmental cues for differentiating neurons, and may also be important for the segregation of cell and fibre layers. Additionally, they seem to be involved in the guidance of axonal fibres both in radial and in lateral directions, as they are involved in the support and stabilization of synapses.
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    Regional adaptation of Müller cells in the chick retina. A Golgi and electron microscopical study
    (Murcia : F. Hernández, 1989) Prada, F. A.; Espinar, A.; Chmielewski, C. E.; Dorado, M. E.; Genís-Gálvez, J. M.
    We report the morphological differences of Müller cells in relation to their topography, using the Golgi method. Müller cells in the central retina are long and slender, with numerous inner prolongations. In the peripheral retina, the morphology of the Müller cells adapts to the reduced thickness of the retina1 layers. In this zone, they are short and have thick inner prolongations which end in a large foot in the internal limiting membrane. In the optic disc margin, Müller cells have a particular morphology characterized by thick, arched prolongations that in general form a glial network between the retina and optic nerve. The ultrastructure of these cells is also described. The results are discussed with respect to the nature of Müller cells.
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    Publication
    Open Access
    Regional adaptation of Müller cells in the chick retina. A Golgi and electron microscopical study
    (Murcia : F. Hernández, 1989) Prada, F. A.; Espinar, A.; Chmielewski, C. E.; Dorado, M. E.; Genís-Gálvez, J. M.
    We report the morphological differences of Müller cells in relation to their topography, using the Golgi method. Müller cells in the central retina are long and slender, with numerous inner prolongations. In the peripheral retina, the morphology of the Müller cells adapts to the reduced thickness of the retina1 layers. In this zone, they are short and have thick inner prolongations which end in a large foot in the internal limiting membrane. In the optic disc margin, Müller cells have a particular morphology characterized by thick, arched prolongations that in general form a glial network between the retina and optic nerve. The ultrastructure of these cells is also described. The results are discussed with respect to the nature of Müller cells.