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Peptidergic neurohormonal systems in the basal hypothalamus of the ferret and the mink: Immunocytochemical study of variations during the annual reproductive cycle

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Summary

The hypothalamic systems secreting corticotropin-releasing hormone (CRF), somatostatin, oxytocin, vasopressin and luteinizing hormone-releasing hormone (LHRH) were characterized using immunochemistry, and variations were studied in relation to the recrudescence of testicular activity in the ferret and the mink, two species with opposite photoregulation of their annual reproductive cycles. Under the present conditions of study, the immunoreactivity of the CRF, somatostatin, and oxytocin systems showed no significant variation in either species.

In contrast, in these two species, the immunoreactivity of the LHRH system varied considerably depending on the date of observation. The increase in the number and immunoreactivity of the LHRH-secreting neurons that occurred in November in the mink and in January in the ferret, is in agreement with previous results showing that the photoperiod plays an essential role in regulating the annual activity of the testis and that the photoperiodic environmental conditions required for the activation of the LHRH system differ between the species.

Similarly, correlations could be found between an increase in immunoreactivity of the vasopressinergic axons projecting to the external median eminence and the recrudescence of testicular activity.

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Authors and Affiliations

  1. Laboratoire de Neurobiologie Endocrinologique, Université de Montpellier-II, UA 1197 CNRS, Montpellier, France

    L. Boissin-Agasse, G. Alonso, G. Roch & J. Boissin

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  1. L. Boissin-Agasse
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  2. G. Alonso
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  3. G. Roch
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  4. J. Boissin
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Boissin-Agasse, L., Alonso, G., Roch, G. et al. Peptidergic neurohormonal systems in the basal hypothalamus of the ferret and the mink: Immunocytochemical study of variations during the annual reproductive cycle. Cell Tissue Res. 251, 153–159 (1988). https://doi.org/10.1007/BF00215460

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