Plurihormonality and Pluripotentiality of GH-Secreting Adenoma Based on Pathological Analysis of 242 patients with Acromegaly
|Research Institute for Pituitary Diseases, Southern Tohoku General Hospital, Koriyama, Fukushima 963-8563, Japan|
|Corresponding Author :||Hidetoshi Ikeda
Research Institute for Pituitary Diseases
Southern Tohoku General Hospital
Koriyama, Fukushima 963-8563, Japan
E-mail: [email protected]
|Received September 21, 2012; Accepted October 27, 2012; Published October 29, 2012|
|Citation: Ikeda H (2012) Plurihormonality and Pluripotentiality of GH-Secreting Adenoma Based on Pathological Analysis of 242 patients with Acromegaly. J Metabolic Synd S2:003. doi:10.4172/2167-0943.S2-003|
|Copyright: © 2012 Ikeda H. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.|
Aim: To disclose the nature of plurihormonality and pluripotentiality of growth hormone (GH)-secreting adenomas.
Methods: A total of 242 patients with GH-secreting adenomas were studied by immunohistochemistry, electron microscopy and clonal analysis (X-linked human androgen receptor gene assay).
Results: GH-secreting adenoma showed a greater variety and number of hormones produced compared with those of PRL-secreting adenomas (p<0.01, Welch’s t-test). The number of cases with GH-secreting adenoma that simultaneously produced ACTH were 50 (21%) out of 242. There were two different types of co-localization of ACTH- and GH-secreting cells within adenoma; (1) adenoma with co-localized ACTH- and GH-immunoreactive cells in a random pattern, and (2) adenoma with a small cell cluster of ACTH-immunoreactive cells within GH-secreting adenomas. There were three different tissue phenotypes in GH-secreting adenomas; (a) mixed tumors composed of adenoma and neuronal cells, (b) co-localization of GHsecreting adenoma and mature bone tissue, and (c) co-localization of GH-secreting adenoma and nerve bundles. In this study, immunoreactivity for nestin was observed in these three different phenotypes of GH-secreting adenomas, not only in perivascular spaces of pituitary tumor vessels but also in parenchymal cells of the pituitary adenoma.
Conclusion: Various kinds of cells can differentiate from the stem cells in GH-secreting adenomas, which may result in plurihormonality and pluripotentiality of adenomas.