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Ultrastructural localization of gastrin-releasing peptide (GRP) in the uterine gland of cow

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Abstract

Gastrin-releasing peptide (GRP) is thought to act mainly as a neurotransmitter and localized almost exclusively to neurons and neuroendocrine cells. Recently, the localization of GRP in mammalian uterus and placenta has been demonstrated. Moreover, the exocrine manner of GRP release was deduced in ewes from the distribution of GRP on the uterine gland cells and its secretion as well as in the circulation. However, these reports have been examined at light-microscopic level. The present study was designed to make clear the localization of GRP in the uterine gland cells of nonpregnant and pregnant cows using an avidin-biotin-peroxidase complex (ABC) method at light-microscopic level and a pre-embedding immunogold with silver enhancement method at electron-microscopic level. The light-microscopic observation showed positive staining for GRP immunoreactivity in the supranuclear region and in the secreted materials of the uterine gland cells. At the electron-microscopic level, the supranuclear secretory granules and the secreted materials on the surface of the cell were labeled with immunogold particles representing GRP immunoreactivity in the uterine gland cells of nonpregnant and pregnant cows. Western blotting analysis showed a larger molecular form of GRP in the endometrial tissues taken from nonpregnant and pregnant cows. The present results revealed the localization of GRP in the uterine gland cells at light- and electron-microscopic levels and suggested the release of GRP from the cell into the lumen of the gland by exocrine manner.

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Acknowledgements

The authors are deeply indebted to the late Dr. N. Yanaihara, Yanaihara Institute, Shizuoka, Japan, for his generous gifts of antisera.

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Authors and Affiliations

  1. Department of Basic Veterinary Sciences, Obihiro University of Agriculture and Veterinary Medicine, Inada-cho Nishi-2, Obihiro 080-855, Japan

    T. Budipitojo, M. Sasaki, M. B. C. Cruzana, N. Kitamura & J. Yamada

  2. Genetics Hokkaido, Shimizu 089-0103, Hokkaido, Japan

    S. Matsuzaki

  3. Department of Cytology and Histology, Division of Physiological Sciences, Hokkaido University Graduate School of Medicine, Sapporo 060-0818, Japan

    T. Iwanaga

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  1. T. Budipitojo
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  2. M. Sasaki
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  3. M. B. C. Cruzana
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  4. S. Matsuzaki
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  5. T. Iwanaga
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  6. N. Kitamura
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  7. J. Yamada
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Correspondence to M. Sasaki.

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Budipitojo, T., Sasaki, M., Cruzana, M.B.C. et al. Ultrastructural localization of gastrin-releasing peptide (GRP) in the uterine gland of cow. Anat Embryol 208, 1–6 (2004). https://doi.org/10.1007/s00429-003-0360-3

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  • DOI: https://doi.org/10.1007/s00429-003-0360-3

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