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Hydroxyurea Exposure and Development of the Cerebellar External Granular Layer: Effects on Granule Cell Precursors, Bergmann Glial and Microglial Cells

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Abstract

The current paper presents a histological analysis of the cell death in the cerebellar external granular layer (EGL) following the treatment with a single dose (2 mg/g) of hydroxyurea (HU). The rats were examined at postnatal days (P) 5, 10, and 15, and sacrificed at appropriate times ranging from 6 to 48 h after treatment administration. Studies were done in each cortical lobe (anterior, central, posterior, and inferior). The quantification of several parameters, such as density of 5-bromo-2′-deoxyuridine, TUNEL, vimentin, and tomato lectin-stained cells, revealed that HU compromises the viability of EGL cells. Our results indicate that P10 is a time of high vulnerability to injury. We also show here that the anterior and central lobes are the cortical regions most susceptible to the action of the HU. Additionally, our data also indicate that from 6 to 24 h after HU-exposure is a time-window of high sensibility to this agent. On the other hand, our ultrastructural analysis confirmed that HU administration produces the activation of apoptotic cellular events in the EGL, resulting in a substantial number of dying cells. Different stages of apoptosis can be observed in all cortical lobes at all investigated postnatal ages and survival times. Moreover, we observed that dying neuroblasts were covered by laminar processes of Bergmann glia, and that these unipolar astrocytes presented cytological features of phagocytes engulfing apoptotic bodies and cell debris. The electron microscopy study also revealed the participation of ameboid microglial cells in the phagocytosis of apoptotic cells in the regions of the EGL with extensive cell death.

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Acknowledgments

The authors are very grateful to Drs. María del Carmen Santa-Cruz and José Pablo Hervás for providing the animals.

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Authors and Affiliations

  1. Unidad de Citología e Histología, Facultad de Biociencias, Universidad Autónoma de Barcelona, 08193 Bellaterra, Barcelona, Spain

    Lucía Rodríguez-Vázquez & Joaquín Martí

  2. Servei d’Estadística Aplicada, Universidad Autónoma de Barcelona, 08193 Bellaterra, Barcelona, Spain

    Olga Vons & Oliver Valero

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  1. Lucía Rodríguez-Vázquez
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  2. Olga Vons
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  4. Joaquín Martí
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Correspondence to Joaquín Martí.

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Rodríguez-Vázquez, L., Vons, O., Valero, O. et al. Hydroxyurea Exposure and Development of the Cerebellar External Granular Layer: Effects on Granule Cell Precursors, Bergmann Glial and Microglial Cells. Neurotox Res 35, 387–400 (2019). https://doi.org/10.1007/s12640-018-9964-5

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