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Seasonal Morphological Changes in the Neuro-Glial Interaction between Gonadotropin-Releasing Hormone Nerve Terminals and Glial Endfeet in Japanese Quail

Division of Biomodeling, Graduate School of Bioagricultural Sciences, Nagoya University (T.Ya., S.E., T.Yo.), and Nagoya University Museum (K.H.), Furo-cho, Chikusa-ku, Nagoya 464-8601, Japan

Address all correspondence and requests for reprints to: Dr. Takashi Yoshimura, Division of Biomodeling, Graduate School of Bioagricultural Sciences, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8601, Japan. E-mail: takashiy{at}agr.nagoya-u.ac.jp.

In a previous study we showed that photoperiodically generated T₃ in the hypothalamus is critical for the photoperiodic response of gonads in Japanese quail. The expression of thyroid hormone receptors in the median eminence (ME) suggested that photoperiodically generated T₃ acts on the ME. Because thyroid hormone is known to play a critical role in the development and plasticity of the central nervous system, in the present study we have examined ultrastructure of the ME in Japanese quail kept in short-day and long-day environments. Immunoelectron microscopy revealed that GnRH nerve terminals are in close proximity to the basal lamina under long-day conditions, and conventional transmission electron microscopy demonstrated the encasement of the terminals by the endfeet of glia under short-day conditions. These morphological changes may regulate photoperiodic GnRH secretion.

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