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Two-dimensional Gel Electrophoresis Coupled with Mass Spectrometry Methods for an Analysis of Human Pituitary Adenoma Tissue Proteome
12:34

Two-dimensional Gel Electrophoresis Coupled with Mass Spectrometry Methods for an Analysis of Human Pituitary Adenoma Tissue Proteome

Published on: April 2, 2018

Expression of mPOU protein in the human pituitary adenomas

Yoshio Sakagami1, Yasuhiko Okimura, Takeshi Kondoh

  • 1Division of Neurosurgery, Department of Organs Therapeutics, Kobe University Graduate School of Medicine, 7-5-1 Kusunoki-cho, Chuo-ku, Kobe 650-0017, Japan.

The Kobe Journal of Medical Sciences
|May 14, 2004
PubMed
Abstract

Insights

The mouse POU (mPOU) protein is expressed in pituitary adenomas, particularly in growth hormone (GH)-producing and prolactin (PRL)-producing tumors. This suggests mPOU may play a role in regulating GH and PRL gene expression alongside Pit-1.

Area of Science:

  • Endocrinology
  • Molecular Biology
  • Oncology

Background:

  • The POU protein family, specifically mPOU (class VI), is found in the pituitary gland and other tissues.
  • Previous research indicated mPOU's role in promoting growth hormone (GH) and prolactin (PRL) gene transcription by binding to Pit-1 DNA elements.
  • Pit-1 is a known transcription factor critical for GH and PRL gene expression.

Purpose of the Study:

  • To investigate the expression patterns of mPOU protein within pituitary adenomas.
  • To determine if mPOU expression correlates with specific types of pituitary adenomas, particularly those producing GH and PRL.

Main Methods:

  • Immunohistochemical analysis using the ABC method was performed on tissue sections from 17 pituitary adenoma patients.
  • Tumor samples included prolactinomas (PRL), somatotropinomas (GH), gonadotropinomas (FSH), and non-functioning adenomas.
  • Tumor excision was conducted via a transsphenoidal approach.

Main Results:

  • mPOU protein was specifically detected in GH-producing adenomas.
  • mPOU protein was also specifically detected in PRL-producing adenomas.
  • Expression of mPOU protein was predominantly observed in the nuclei of tumor cells.

Conclusions:

  • The findings indicate that mPOU protein is expressed in GH-producing and PRL-producing pituitary adenomas.
  • While Pit-1 is established as a key regulator, mPOU may also contribute to the regulation of GH and PRL gene expression in the pituitary.
  • mPOU's specific expression in these adenoma types suggests a potential role in pituitary tumorigenesis or function.

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