Surface changes and hormone production in pituitary cells during tumorigenesis

W. K A Khalil, L. Gáspár, G. Szalai, J. Julesz, M. Gálfi

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

Prolactinomas were induced by chronic estrone acetate treatment in female Wistar rats in vivo. After enzymatic dissociation of the tumor tissue, monolayer cell cultures were obtained. In vitro tumor induction was performed by treatment of normal monolayer anterior pituitary cell cultures with a 1:1 mixture of 7,9-dimethylbenz[c]acridine: 8-methylbenz[c]acridine. For immunohistochemistry, the cell cultures were stained by the peroxidase- antiperoxidase method for standardization; the nonspecific hormone release was induced with 30 mM K+. The prolactin, α-melanotropin, and adrenocorticotropin levels in the supernatant were measured by specific, sensitive radioimmunoassays. The results indicated surface differences between the in vivo induced prolactinoma cells and normal pituitary cells: the attachment of the prolactinoma cells required 15% collagen treatment, whereas normal cells required only 3-4% collagen. Tumor cells induced in vitro by methylbenz[c]acridine treatment were able to attach only after ammonia activation of the collagen surface. These findings strongly suggest that the mode of tumor induction can result in differences in membrane fluidity; this phenomenon is possibly connected with the levels of prolactin, adrenocorticotropin and alpha-melanotropin hormone production of these endocrine tumor cells.

Original languageEnglish
Pages (from-to)553-558
Number of pages6
JournalJournal of Experimental and Clinical Cancer Research
Volume18
Issue number4
Publication statusPublished - Dec 1999

Fingerprint

Carcinogenesis
Prolactinoma
Hormones
Acridines
Collagen
Cell Culture Techniques
Neoplasms
Prolactin
Adrenocorticotropic Hormone
Melanocyte-Stimulating Hormones
alpha-MSH
Membrane Fluidity
Endocrine Cells
Therapeutics
Ammonia
Peroxidase
Radioimmunoassay
Wistar Rats
Immunohistochemistry
In Vitro Techniques

Keywords

  • Adrenocorticotropin
  • Alpha- melanotropin
  • Benz[c]acridines
  • Cell surface
  • Pituitary
  • Prolactin
  • Tumorigenesis

ASJC Scopus subject areas

  • Cancer Research
  • Oncology

Cite this

Surface changes and hormone production in pituitary cells during tumorigenesis. / Khalil, W. K A; Gáspár, L.; Szalai, G.; Julesz, J.; Gálfi, M.

In: Journal of Experimental and Clinical Cancer Research, Vol. 18, No. 4, 12.1999, p. 553-558.

Research output: Contribution to journalArticle

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