A Histopathological Study of Multi-hormone Producing Proliferative Lesions in Estrogen-induced Rat Pituitary Prolactinoma |
| |
Authors: | Susumu Takekoshi Yuzo Yasui Chie Inomoto Kanae Kitatani Naoya Nakamura Robert Yoshiyuki Osamura |
| |
Affiliation: | 1.Department of Cell Biology, Division of Host Defense Mechanism, Tokai University School of Medicine, 143 Shimokasuya, Isehara, Kanagawa 259–1193, Japan;2.Department of Pathology, Tokai University School of Medicine, 143 Shimokasuya, Isehara, Kanagawa 259–1193, Japan;3.Center for Diagnostic Pathology, International University of Health and Welfare Mita Hospital, 1–4–3 Mita, Minato-ku, Tokyo 108–8239, Japan |
| |
Abstract: | 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 controlled-release 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, TSHβ, and α subunits and were negative for GH, LHβ, ACTH, and S-100. Double immunostaining revealed that these large eosinophilic cells showed coexpression of PRL and TSHβ, PRL and α subunits, and TSHβ and α subunits. Those results clarified that long-term estrogen administration to female SD rats induced multi-hormone producing neoplastic pituitary nodules that expressed PRL, TSHβ, and α 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. |
| |
Keywords: | prolactinoma multi-hormone producing adenoma estrogen laser capture microdissection |
|
|