by Keyword: Reelin

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Mata, Agata, Urrea, Laura, Vilches, Silvia, Llorens, Franc, Thüne, Katrin, Espinosa, Juan-Carlos, Andréoletti, Olivier, Sevillano, Alejandro M., Torres, Juan María, Requena, Jesús Rodríguez, Zerr, Inga, Ferrer, Isidro, Gavín, Rosalina, del Río, José Antonio, (2017). Reelin expression in Creutzfeldt-Jakob disease and experimental models of transmissible spongiform encephalopathies Molecular Neurobiology 54, (8), 6412-6425

Reelin is an extracellular glycoprotein involved in key cellular processes in developing and adult nervous system, including regulation of neuronal migration, synapse formation, and plasticity. Most of these roles are mediated by the intracellular phosphorylation of disabled-1 (Dab1), an intracellular adaptor molecule, in turn mediated by binding Reelin to its receptors. Altered expression and glycosylation patterns of Reelin in cerebrospinal and cortical extracts have been reported in Alzheimer’s disease. However, putative changes in Reelin are not described in natural prionopathies or experimental models of prion infection or toxicity. With this is mind, in the present study, we determined that Reelin protein and mRNA levels increased in CJD human samples and in mouse models of human prion disease in contrast to murine models of prion infection. However, changes in Reelin expression appeared only at late terminal stages of the disease, which prevent their use as an efficient diagnostic biomarker. In addition, increased Reelin in CJD and in in vitro models does not correlate with Dab1 phosphorylation, indicating failure in its intracellular signaling. Overall, these findings widen our understanding of the putative changes of Reelin in neurodegeneration.

Keywords: Reelin, Creutzfeldt-Jakob disease, Dab-1, Cellular prion protein

Gil, V., Nocentini, S., del Río, J. A., (2014). Historical first descriptions of Cajal-Retzius cells: From pioneer studies to current knowledge Frontiers in Neuroanatomy 8, Article 32 (9)

Santiago Ramón y Cajal developed a great body of scientific research during the last decade of 19th century, mainly between 1888 and 1892, when he published more than 30 manuscripts. The neuronal theory, the structure of dendrites and spines, and fine microscopic descriptions of numerous neural circuits are among these studies. In addition, numerous cell types (neuronal and glial) were described by Ramón y Cajal during this time using this "reazione nera" or Golgi method. Among these neurons were the special cells of the molecular layer of the neocortex. These cells were also termed Cajal cells or Retzius cells by other colleagues. Today these cells are known as Cajal-Retzius cells. From the earliest description, several biological aspects of these fascinating cells have been analyzed (e.g., cell morphology, physiological properties, origin and cellular fate, putative function during cortical development, etc). In this review we will summarize in a temporal basis the emerging knowledge concerning this cell population with specific attention the pioneer studies of Santiago Ramón y Cajal.

Keywords: Calretinin, Cortical hem, Neocortical development, Pioneer neurons, Radial glia, Reelin