Hypothalamo‑hypophysial system in rats with autotransplantation of the adrenal cortex

Takizawa,Nae; Tanaka,Susumu; Oe,Souichi; Koike,Taro; Matsuda,Tadashi; Yamada,Hisao

doi:10.3892/mmr.2017.6375

Hypothalamo‑hypophysial system in rats with autotransplantation of the adrenal cortex

Authors:
- Nae Takizawa
- Susumu Tanaka
- Souichi Oe
- Taro Koike
- Tadashi Matsuda
- Hisao Yamada
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Affiliations: Department of Anatomy and Cell Science, Kansai Medical University, Hirakata, Osaka 573‑1010, Japan, Department of Urology and Andrology, Kansai Medical University, Hirakata, Osaka 573‑1010, Japan
Published online on: March 24, 2017 https://doi.org/10.3892/mmr.2017.6375
Pages: 3215-3221

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Abstract

Patients with bilateral pheochromocytoma often require an adrenalectomy. Autotransplantation of the adrenal cortex is an alternative therapy that could potentially be performed instead of receiving glucocorticoid replacement following adrenalectomy. Adrenal cortex autotransplantation aims to avoid the side effects of long‑term steroid treatment and adrenal insufficiency. Although the function of the hypothalamo‑hypophysial system is critical for patients who have undergone adrenal cortex autotransplantation, the details of that system, with the exception of adrenocorticotropic hormone in the subjects with adrenal autotransplantation, have been overlooked for a long time. To clarify the precise effect of adrenal autotransplantation on the pituitary gland and hypothalamus, the current study examined the gene expression of hormones produced from the hypothalamus and pituitary gland. Bilateral adrenalectomy and adrenal autotransplantation were performed in 8 to 9‑week‑old male rats. The hypothalamus and pituitary tissues were collected at 4 weeks after surgery. Transcriptional regulation of hypothalamic and pituitary hormones was subsequently examined by reverse transcription‑quantitative polymerase chain reaction. Proopiomelanocortin, glycoprotein hormone α polypeptide, and thyroid stimulating hormone β were significantly elevated in the pituitary gland of autotransplanted rats when compared with sham‑operated rats. In addition, there were significant differences in the levels of corticotropin releasing hormone receptor 1 (Crhr1), Crhr2, nuclear receptor subfamily 3 group C member 1 and thyrotropin releasing hormone receptor between the sham‑operated rats and autotransplanted rats in the pituitary gland. In the hypothalamus, corticotropin releasing hormone and urocortin 2 mRNA was significantly upregulated in autotransplanted rats compared with sham‑operated rats. The authors identified significant alterations in the function of not only the hypothalamus‑pituitary‑adrenal axis, but also the adenohypophysis thyrotropes in autotransplanted rats. In the future, it will be important to examine other tissues affected by glucocorticoids following adrenal cortex autotransplantation.

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