title: Transdermal estradiol in menopausal women depresses interleukin-6 without affecting other markers of immune response.
abstract: OBJECTIVE
  The aim of this study was to analyze the effect of transdermal estradiol replacement therapy (HRT) on immune function in menopausal women.
  
  
  METHODS
  A prospective comparative study was carried out in 30 women, aged 48-55 years, who were divided into two groups; 20 of them received transdermal estradiol 50 microg/day during 3 months and 10 who refused to receive HRT served as controls. Serum interleukins were quantified by specific immunoenzymatic assays; in addition, hormones of somatotropin axis and prolactin (PRL) were quantified by IRMA and RIA.
  
  
  RESULTS
  Baseline elevated interleukin (IL)-6 levels decreased significantly (p < 0.001) after transdermal HRT as compared with the nontreated group. Contrarily, IL-2 and IL-10 levels as well as mitogenic induced T-cell proliferation were unchanged under HRT. Insulin-like growth factor-I, growth hormone and PRL levels were unaltered by transdermal HRT.
  
  
  CONCLUSIONS
  Decrement of IL-6 in parallel with absent effect on some indices of immune activity suggests a beneficial action of transdermal HRT. These findings contrast with those demonstrating an increment of immune response in women taking oral HRT. Thus, the route of administra tion determines the effect of HRT on immune function.
authors.affiliation: Endocrine Research Unit and Immunology Research Unit, Centro Médico Nacional, Instituto Mexicano del Seguro Social, Mexico City, Mexico.
authors.forename: Renata
authors.initials: R
authors.lastname: Saucedo
authors.forename: Guadalupe
authors.initials: G
authors.lastname: Rico
authors.forename: Lourdes
authors.initials: L
authors.lastname: Basurto
authors.forename: Raquel
authors.initials: R
authors.lastname: Ochoa
authors.forename: Arturo
authors.initials: A
authors.lastname: Zárate
mesh_terms: D000279:Administration, Cutaneous; D004958:Estradiol / Q000008:administration & dosage*; D015914:Estrogen Replacement Therapy; D005260:Female; D006801:Humans; D015850:Interleukin-6 / Q000097:blood*; D008213:Lymphocyte Activation; D008593:Menopause; D008875:Middle Aged; D013601:T-Lymphocytes / Q000276:immunology*
chemical_list: D015850:Interleukin-6; D004958:Estradiol