title: Preliminary results on intersexual differences in gene expression of chemokine K203 in mononuclear cells of chicken.
abstract: Sex steroid levels increase during sexual maturation and cause alterations in many physiological and morphological traits. Some of these changes may be connected with age-dependent and intersexual differences in the immune system. This topic is still insufficiently understood, especially in avian species, partially due to methodological limitations. In this study we measured the gene expression of proinflammatory cytokines (IL-1β, IL-6, IL-18) and chemokines [K60 (IL-8-like chicken chemokine - CXCLi1), CAF (IL-8-like chicken chemokine - CXCLi2), and K203] in mononuclear cells isolated from blood and spleen after in vitro stimulation with lipopolysaccharide (LPS). Samples were collected from chickens at two ages (from pullets before sexual maturity and from sexually mature egglaying hens). After LPS stimulation, a substantial increase was recorded in the gene expression of IL-6 and K203. All other measured genes were expressed at low levels in mononuclear cells irrespective of cell sources. We found a trend toward intersexual differences in K203 expression, but the expression of other cytokines and chemokines did not differ between the two sexes. The effect of stimulation was more pronounced in monocytes than in spleen macrophages, mainly in IL-6, IL-1β and K203 gene expression. Our findings represent a basis for further studies on the effects exerted by sexual hormones on the immune phenotype of birds.
authors.affiliation: Department of Animal Physiology and Ethology, Faculty of Natural Sciences, Comenius University Bratislava , Mlynská dolina, 842 15 Bratislava 4 , Slovak Republic.
authors.forename: Zuzana
authors.initials: Z
authors.lastname: Kaňková
authors.affiliation: Department of Animal Physiology and Ethology, Faculty of Natural Sciences, Comenius University Bratislava , Mlynská dolina, 842 15 Bratislava 4 , Slovak Republic.|Institute of Animal Biochemistry and Genetics, Slovak Academy of Sciences , Ivanka pri Dunaji , Slovak Republic.
authors.forename: Michal
authors.initials: M
authors.lastname: Zeman
authors.affiliation: Department of Veterinary Sciences, Institute for Animal Physiology, Ludwig-Maximilians-University , Munich , Germany.
authors.forename: Susanne
authors.initials: S
authors.lastname: Schwarz
authors.affiliation: Department of Veterinary Sciences, Institute for Animal Physiology, Ludwig-Maximilians-University , Munich , Germany.
authors.forename: Bernd
authors.initials: B
authors.lastname: Kaspers
mesh_terms: D000818:Animals; D018925:Chemokines / Q000378:metabolism*; D002645:Chickens; D016207:Cytokines / Q000378:metabolism*; D005260:Female; D005786:Gene Expression Regulation / Q000276:immunology*; D007963:Leukocytes, Mononuclear / Q000378:metabolism*; D008070:Lipopolysaccharides; D008264:Macrophages; D008297:Male; D012737:Sex Factors
chemical_list: D018925:Chemokines; D016207:Cytokines; D008070:Lipopolysaccharides
keywords: Sex steroid hormones; chemokines; lipopolysaccharide; macrophages