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Immunocytochemical localization of corticotropin-releasing factor in the brain of the turtle, Mauremys caspica

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Abstract

Brain sections of the turtle, Mauremys caspica were studied by means of an antiserum against rat corticotropin-releasing factor. Immunoreactive neurons were identified in telencephalic, diencephalic and mesencephalic areas such as the cortex, nucleus caudatus, nucleus accumbens, amygdala, subfornical organ, paraventricular nucleus, hypothalamic dorsolateral aggregation, nucleus of the paraventricular organ, infundibular nucleus, pretectal nucleus, periventricular grey, reticular formation and nucleus of the raphe. Many immunoreactive cells located near the ependyma were bipolar, having an apical dendrite that contacted the cerebrospinal fluid. Immunoreactive fibers were seen in these locations and in the lamina terminalis, lateral forebrain bundle, supraoptic nucleus, median eminence, neurohypophysis, tectum opticum, torus semicircularis and deep mesencephalic nucleus. Parvocellular bipolar immunoreactive neurons from the paraventricular and infundibular nuclei projected axons that joined the hypothalamo-hypophysial tract and reached the outer zone of median eminence, and the neural lobe of the hypophysis where immunoreactive fibers terminated close to intermediate lobe cells. From these results it can be concluded that, as in other vertebrates, corticotropin-releasing factor in the turtle may act as a releasing factor and, centrally, as a neurotransmitter or neuromodulator.

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Authors and Affiliations

  1. Departamento de Biología Celular, Facultad de Ciencias, Universidad de Málaga, E-29071, Málaga, Spain

    M. D. López Avalos, J. M. Mancera & J. M. Pérez-Fígares

  2. Departamento de Biología Animal, Facultad de Ciencias, Universidad de Málaga, E-29071, Málaga, Spain

    P. Fernández-Llebrez

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  1. M. D. López Avalos
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  2. J. M. Mancera
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  3. J. M. Pérez-Fígares
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  4. P. Fernández-Llebrez
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Avalos, M.D.L., Mancera, J.M., Pérez-Fígares, J.M. et al. Immunocytochemical localization of corticotropin-releasing factor in the brain of the turtle, Mauremys caspica . Anat Embryol 188, 163–171 (1993). https://doi.org/10.1007/BF00186250

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