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Occurrence and Nuclear Localization of cAMP Response Element- Binding Protein in the Post-natal Development of the Rat Submandibular Gland

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Abstract

Cyclic AMP response element-binding protein (CREB) is a 43-kDa polypeptide that binds a cAMP response element located at the 5′ promoter region of cAMP regulatory genes. The spatial and temporal distribution of CREB in the post-natal development of the rat submandibular gland was investigated using immunohistochemistry with a specific antibody. At birth, cells of the terminal tubules and ducts in the submandibular gland showed a nuclear CREB immunoreactivity of moderate intensity. At 1–2 weeks after birth, an intense CREB immunoreactivity was localized primarily to acinar cells. When the r352;-adrenergic agonist isoproterenol was administered to 2-week-old rats, a twofold transient increase in the number of immunoreactive acinar cells was induced. Beginning 3 weeks after birth, CREB immunoreactivity shifted from acini to the duct system and showed a clear localization in the cells of the intercalated ducts and distal portions of striated ducts, where the granular convoluted tubule develops after 4 weeks. Immunopositive materials were localized exclusively in the nuclei of both acinar and ductal immunoreactive cells. After the development of the granular convoluted tubules, CREB immunoreactivity was absent in the tubule cells and was gradually reduced in intensity over the entire gland. In order to examine a hypothesis that CREB is involved in the initial differentiation of the granular convoluted tubular cells, testosterone was administered to hypophysectomized adult rats. Whereas the tubular cells of hypophysectomized rats showed a complete regression, and no CREB immunoreactivity was found in any acinar or duct cells, administration of testosterone for a few days induced an intense CREB immunoreactivity in the nuclei of duct cells, followed by their differentiation into the granular convoluted tubular cells. These results suggested that CREB is involved not only in the growth and differentiation of acinar ce lls that are regulated by r352;-adrenergic nerves but also in those of the duct system, and especially in the androgen-regulated differentiation of the granular convoluted tubular cells, during the post-natal development of the rat submandibular gland.

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Authors
  1. Osamo Amano
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  2. Shoichi Iseki
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Amano, O., Iseki, S. Occurrence and Nuclear Localization of cAMP Response Element- Binding Protein in the Post-natal Development of the Rat Submandibular Gland. Histochem J 30, 591–601 (1998). https://doi.org/10.1023/A:1003258514766

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