title: Sex hormones modulate the immune response to Plasmodium berghei ANKA in CBA/Ca mice.
abstract: Susceptibility to malaria differs between females and males, and this sexual dimorphism may have important implications for the effects of vaccines and drugs. However, little is known about the mechanisms mediating these sexual differences. Because the main differences between sexes are dictated by sex hormones, we studied the effect of gonadal steroids on immune responses to malaria in CBA/Ca mice. We decreased sex hormones levels by gonadectomy and evaluated the splenic index and the cells involved in the immune response, including T cells (CD3(+), CD4(+), CD8(+) and NK(+)), B cells and macrophages (Mac-3(+)) in the spleens of female and male mice infected with Plasmodium berghei ANKA. In addition, we measured antibody and cytokine levels in blood. Gonadectomy increased T(+) and B(+) splenic cells in both sexes but increased Mac-3(+) cells only in male mice. By contrast, gonadectomy decreased the NK(+) cell population only in male mice. In general, female mice developed higher antibody levels than males. Contrary to our expectations, gonadectomy increased the synthesis of IgG1, IgG2b, IgG3, and total IgG in female mice, indicating negative regulation of antibody production by female sex hormones. Gonadectomy increased the synthesis of tumour necrosis factor alpha (TNF-α) and interleukin-6 (IL-6) only in female mice, suggesting that female sex hormones have anti-inflammatory properties. This work demonstrates that the levels of sex hormones affect the immune response and should be considered when designing malaria vaccines.
authors: Laboratorio de Inmunología Molecular, Facultad de Estudios Superiores Zaragoza, Universidad Nacional Autónoma de México, Batalla 5 de mayo esq. Fuerte de Loreto, Iztapalapa, 09230, Mexico, DF, Mexico, marthal@unam.mx.
authors: Martha
authors: M
authors: Legorreta-Herrera
authors: Néstor Aarón
authors: NA
authors: Mosqueda-Romo
authors: Karen Elizabeth
authors: KE
authors: Nava-Castro
authors: Ana Laura
authors: AL
authors: Morales-Rodríguez
authors: Fidel Orlando
authors: FO
authors: Buendía-González
authors: Jorge
authors: J
authors: Morales-Montor
mesh_terms: D000818:Animals; D000913:Antibodies, Protozoan / Q000097:blood*; D001402:B-Lymphocytes / Q000276:immunology; D016207:Cytokines / Q000097:blood / Q000235:genetics; D004198:Disease Susceptibility; D005260:Female; D012739:Gonadal Steroid Hormones / Q000276:immunology*; D007694:Killer Cells, Natural / Q000276:immunology; D008264:Macrophages / Q000276:immunology; D008288:Malaria / Q000276:immunology*; D008297:Male; D051379:Mice; D008808:Mice, Inbred CBA; D018512:Parasitemia; D010962:Plasmodium berghei / Q000276:immunology*; D013154:Spleen / Q000276:immunology; D013601:T-Lymphocytes / Q000276:immunology
chemical_list: D000913:Antibodies, Protozoan; D016207:Cytokines; D012739:Gonadal Steroid Hormones