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Quantitative Study of Apoptotic Cells in the Goldfish Retina

机译:金鱼视网膜中凋亡细胞的定量研究

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In the vertebrate retina, It has been shown that a large number of neurons produced at the onset of neurogenesis die early in development. Since this apoptotic cell death occurs In a short, limited time, little is known In detail on Its histocytology. Using the terminal deoxynucleotidyl transferase-mediated dUTP nick end labeling (TUNEL) method, we Investigated the apoptotic cells in the adult goldfish retina In which the progenitor cell keeps proliferating. Most of the TUNEL-positive nuclei were found In the marginal retina, about 40-200 mu m from the circular blood vessel (CBV) running parallel to the retinal rim. The peak density was about 1400/mm(2) surface area at 90-130 mu m from the CBV. Overall retinal cell density In the marginal retina was also studied by toluidine blue staining. The retinal cell density increased toward the central retina, reaching a peak density of 278,000/mm(2) at 130 gm from the CBV. It then decreased gradually to 228,000/mm2 In the mature retina. This 18% reduction seemed to be caused by apoptosis. We also found a significant increase in the mean density of apoptotic cells in goldfish sacrificed at midnight, 403/mm(2), compared to that at midday, 217/mm(2). This increase was not seen in goldfish kept under either constant darkness or constant light.
机译:在脊椎动物的视网膜中,已经表明在神经发生开始时产生的大量神经元在发育的早期死亡。由于这种凋亡细胞死亡发生的时间很短,因此对其组织细胞学的了解很少。使用末端脱氧核苷酸转移酶介导的dUTP缺口末端标记(TUNEL)方法,我们研究了成年金鱼视网膜中祖细胞不断增殖的凋亡细胞。 TUNEL阳性细胞大部分位于边缘视网膜,距圆形血管(CBV)约40-200μm,平行于视网膜边缘。从CBV的90-130微米处,峰密度约为1400 / mm(2)表面积。甲苯胺蓝染色也研究了边缘视网膜的总体视网膜细胞密度。视网膜细胞密度朝着中央视网膜增加,从CBV到130 gm达到278,000 / mm(2)的峰值密度。然后在成熟的视网膜中逐渐降低至228,000 / mm2。减少18%似乎是由凋亡引起的。我们还发现,与午夜时分的217 / mm(2)相比,午夜时分牺牲的金鱼的凋亡细胞平均密度显着增加,为403 / mm(2)。在不断黑暗或不断光照下的金鱼中看不到这种增加。

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