Presence and steroid inducibility of glutamine synthetase in human leukemic cells

Paolo Marchetti, Franco O. Ranelletti, Vittoria Natoli, Gigliola Sica, Giulio De Rossi, Stefano Iacobelli

Research output: Contribution to journalArticlepeer-review

Abstract

Glutamine synthetase (EC 6.3.1.2; GS) is present in lymphoblasts from patients with acute lymphoblastic leukemia (ALL) as well as in normal peripheral blood lymphocytes. In 16 out of 20 ALL patients studied exposure of the cells to physiological concentrations of dexamethasone in vitro increased enzyme activity above the control levels. The increase was specific for glucocorticoid receptor ligands. A direct correlation was found between the magnitude of glucocorticoid-mediated increase of GS activity and the cellular levels of specific glucocorticoid receptors assayed in the same cell specimen. Moreover, the basal levels of the enzyme measured in cells prior to exposure to dexamethasone correlated negatively with receptor density. It is suggested that the presence of steroid-inducible GS in ALL cells may prove to be a marker for functional receptor sites.

Original languageEnglish
Pages (from-to)1665-1670
Number of pages6
JournalJournal of Steroid Biochemistry
Volume19
Issue number5
DOIs
Publication statusPublished - 1983

ASJC Scopus subject areas

  • Biochemistry
  • Endocrinology

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