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Related Experiment Videos

Intermediate filament expression in pituitary adenomas.

A Ogawa1, S Sugihara, M Hasegawa

  • 1Department of Pathology, Gunma Cancer Center Hospital, Japan.

Virchows Archiv. B, Cell Pathology Including Molecular Pathology
|January 1, 1990
PubMed
Summary

Pituitary adenoma cells express keratin, vimentin, and neurofilaments (NFs), key intermediate filaments (IMFs). IMF patterns in these tumors do not correlate with hormone production.

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Area of Science:

  • Endocrinology
  • Oncology
  • Cell Biology

Background:

  • Pituitary adenomas are common tumors arising from the pituitary gland.
  • Understanding the cellular composition and intermediate filament (IMF) expression in pituitary adenomas is crucial for diagnosis and research.

Purpose of the Study:

  • To investigate the expression and co-expression patterns of various intermediate filaments (keratin, vimentin, neurofilaments) in pituitary adenomas.
  • To determine if IMF distribution correlates with specific pituitary hormones or tumor characteristics.

Main Methods:

  • Immunohistochemical analysis of 93 pituitary adenomas (75 formalin-fixed, 18 alcohol-fixed).
  • Utilized antibodies against keratin, vimentin, neurofilaments (68 kDa and 160 kDa), glial fibrillary acidic protein, desmin, actin, S-100 protein, and pituitary hormones.

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Main Results:

  • Pituitary adenoma cells frequently expressed keratin, vimentin, and neurofilaments (NFs).
  • Co-expression of these three intermediate filaments (IMFs) was observed in some cases.
  • IMF staining patterns (diffuse cytoplasmic, patchy paranuclear, fibrillar) were noted.
  • No significant correlation was found between IMF distribution and pituitary hormone production, except for melanocyte-stimulating hormone (MSH)-positive adenomas being NF-positive.

Conclusions:

  • Pituitary adenomas exhibit diverse IMF expression profiles, including keratin, vimentin, and NFs.
  • IMF expression patterns in pituitary adenomas are largely independent of hormone production.
  • Neurofilament expression may be associated with MSH-producing adenomas.