A Histopathological Study of Multi-hormone Producing Proliferative Lesions in Estrogen-induced Rat Pituitary Prolactinoma

作者：Takekoshi Susumu^*; Yasui Yuzo; Inomoto Chie; Kitatani Kanae; Nakamura Naoya; Osamura Robert Yoshiyuki

来源：Acta Histochemica et Cytochemica, 2014, 47(4): 155-164.

DOI：10.1267/ahc.14029

• prolactinoma
• multi-hormone producing adenoma
• estrogen
• laser capture microdissection

Rats with estrogen-induced prolactin-producing pituitary adenoma (E2-PRLoma) have been employed as an animal model of human PRL-producing pituitary adenoma in a large number of studies. Presently, we found that long-term administration of estrogen to SD rats resulted in the development of E2-PRLomas, some of which included multi-hormone producing nodules. We herein report results of histopathological analyses of these lesions. PRLoma models were created in female SD rats by 22 weeks or longer administration of a controlledrelease preparation of estradiol at a dose of 10 mg/kg/2 weeks. Ten of the 11 PRLoma model rats had proliferative nodular lesions composed of large eosinophilic cells like gonadotrophs inside the PRLoma. These lesions were positive for PRL, TSH beta, and alpha subunits and were negative for GH, LH beta, ACTH, and S-100. Double immunostaining revealed that these large eosinophilic cells showed coexpression of PRL and TSH beta, PRL and alpha subunits, and TSH beta and alpha subunits. Those results clarified that long-term estrogen administration to female SD rats induced multi-hormone producing neoplastic pituitary nodules that expressed PRL, TSH beta, and alpha subunits. We studied these neoplastic nodules obtained by laser microdissection to acquire findings similar to those of the immunohistochemical analysis. We consider that this animal model is useful for pathogenesis analyses and therapeutic agent development concerning human multi-hormone producing pituitary adenomas.

• 出版日期2014