Intercellular Communication within the Rat Anterior Pituitary : Immunohistochemical Study on the Relationship between the Hypothalamus, Agranular Cells and GnRH Neurons in the Pars Tuberalis and Anterior Pituitary Gland

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概要

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• The pars tuberalis has been generally understood as a simple forward elongation of the glandular pituitary that develops into an architecturally similar structure. In rats, it is also believed that the pars tuberalis completely encircles the infundibular stalk at the ventral portion of hypothalamus. Intact Wistar-lmamichi rats were used in the present study, and frontal and sagittal serial sections of the pituitary gland/brain complex were prepared. Serial sections were stained with hematoxylin-eosin and with antibodies to LH-RH, S-100 protein or LH-RH receptor. Electron microscopic analyses were also conducted. The anatomical end of the epithelial structure of the pars tuberalis was observed at approximately 1 mm behind the optic chiasm. At this point, both the capillaries and the pars tuberalis spread and interdigitated over the median eminence. The pars tuberalis did not, however, completely encircle the pituitary stalk. Electron microscopic observations revealed some profiles of neuroendocrine nerve elements that were also present between the agranular cells of the pars tuberalis. A few LH-RH-positive nerve fibers were initially found just behind the optic chiasm, while the number of LH-RH-positive reactions increased around the capillary vessels. These reactions then decreased significantly and were sparsely distributed both in the diencephalon and in the area near the pituitary stalk where the two separated. LH-RH receptors were observed on S-100 protein-positive cells in the pars tuberalis. The present observations show the significance of the pars tuberalis and its relationship between the anterior pituitary gland and the hypothalamus as organs that possibly form another collaborating mechanism for the regulation of hormone secretion of the anterior pituitary gland.

• 日本組織細胞化学会の論文

著者

• SATO Goro

  Department of High Energy Astrophysics, Institute of Space and Astronautical Science Aerospace Explo

• HERBERT DAMON

  Department of Cellular and Structural Biology, The University of Texas Health Science Center

• Sato Goro

  Department Of Functional Morphology Nagoya City University Graduate School Of Medical Sciences

• Herbert D

  Univ. Texas Health Sci. Center Texas Usa

• Herbert Damon

  Department Of Cellular And Structural Biology The University Of Texas Health Science Center At San A

• Herbert Damon

  Department Of Cellular And Structural Biology The University Of Texas Health Science Center

• SHIRASAWA Nobuyuki

  Department of Anatomy, Wakayama Medical College

• SATO Yumi

  Department of Chemistry, Faculty of Science, Kyushu University

• SOJI Tsuyoshi

  Department of Anatomy, Nagoya City University School of Medicine

• Sato Yumi

  Department Of Molecular Diagnostics School Of Allied Health Sciences Kitasato University

• Soji Tsuyoshi

  Department Of Functional Morphology Nagoya City University Medical School

• Soji Tsuyoshi

  Department Of Anatomy Fukuoka University School Of Medicine

• SAKUMA EISUKE

  Department of Functional Morphology, Nagoya City University Medical School

• MABUCHI YOSHIO

  Department of Functional Morphology, Nagoya City University Medical School

• Sakuma Eisuke

  Department Of Functional Morphology Nagoya City University Medical School

• Sakuma E

  Nagoya City Univ. Graduate School Of Medical Sceince Aichi Jpn

• Sakuma Eisuke

  Department Of Functional Morphology Nagoya City University Graduate School Of Medical Sciences Nagoy

• Mabuchi Yoshio

  Department Of Functional Morphology Nagoya City University Medical School

• Mabuchi Y

  Nagoya City Univ. Graduate School Of Medical Sceince Aichi Jpn

• Kurita Jun

  Department of Functional Morphology, Nagoya City University, Graduate School of Medical Sciences

• Kurita J

  Department Of Functional Morphology Nagoya City University Graduate School Of Medical Sciences

• Shirasawa Nobuyuki

  Department Of Anatomy And Cell Biology Wakayama Medical University

• Shirasawa Nobuyuki

  Department Of Anatomy And Structural Science Yamagata University School Of Medicine

• Sato Yumi

  Department Of Chemistry Faculty Of Science Kyushu University

• Sato Yumi

  Department of Agricultural Chemistry, The University of Tokyo

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