Danazol therapy renders red cells resistant to osmotic lysis

Y. S. Ahn, L. F. Fernandez, C. I. Kim, R. Mylvaganam, J. D. Temple, M. L. Cayer, W. J. Harrington

Research output: Contribution to journalArticlepeer-review

18 Scopus citations


Danazol, an attenuated androgen, is useful in endometriosis, idiopathic thrombocytopenic purpura (ITP), and autoimmune hemolytic anemia (AIHA). However, its mechanism of action is unknown. We investigated the possibility that danazol affects cell membranes directly. Red cell osmotic fragility was studied in patients receiving danazol. A significant decrease in osmotic fragility was observed. Accompanying the change, peripheral blood smears showed many target cells and electron microscopy revealed extra folds in erythrocyte membranes. Twenty-two patients were studied prospectively before and after danazol. Osmotic fragility decreased significantly (P < 0.001) in 1 month of therapy and progressed with further treatment. A rebound increase (P < 0.01) was observed in 1 month after discontinuation of danazol among 16 patients. Incubation experiments showed that danazol-induced changes are not reversed with normal sera. Patient sera did not induce the changes in normal red cells. Danazol in vitro protected red cells from osmotic lysis at low concentrations but enhanced lysis at high concentrations. We suggest that danazol alters red cell membranes directly to increase their surface area, inducing target cell formation and increasing their resistance to osmotic lysis.

Original languageEnglish (US)
Pages (from-to)157-162
Number of pages6
JournalFASEB Journal
Issue number2
StatePublished - 1989

ASJC Scopus subject areas

  • Biotechnology
  • Biochemistry
  • Molecular Biology
  • Genetics


Dive into the research topics of 'Danazol therapy renders red cells resistant to osmotic lysis'. Together they form a unique fingerprint.

Cite this