title: Expression and function of chicken bursal growth hormone (GH).
abstract: Growth hormone (GH) has several effects on the immune system. Our group has shown that GH is produced in the chicken bursa of Fabricius (BF) where it may act as an autocrine/paracrine modulator that participates in B-cell differentiation and maturation. The time course of GH mRNA and protein expression in the BF suggests that GH may be involved in development and involution of the BF, since GH is known to be present mainly in B lymphocytes and epithelial cells. In addition, as GH is anti-apoptotic in other tissues, we assessed the possibility that GH promotes cell survival in the BF. This work focused on determining the mechanism by which GH can inhibit apoptosis of B cells and if the PI3K/Akt pathway is activated. Bursal cell cultures were treated with a range of GH concentrations (0.1-100nM). The addition of 10nM GH significantly increased viability (16.7±0.6%) compared with the control and decreased caspase-3 activity to 40.6±6.5% of the control. Together, these data indicate that GH is produced locally in the BF and that the presence of exogenous GH in B cell cultures has antiapoptotic effects and increases B cell survival, probably through the PI3k/Akt pathway.
authors.affiliation: Departamento de Neurobiología Celular y Molecular, Instituto de Neurobiología, Universidad Nacional Autónoma de México, Querétaro, Qro. 76230, Mexico. lunam@unam.mx
authors.forename: Maricela
authors.initials: M
authors.lastname: Luna
authors.forename: Adriana Jheny
authors.initials: AJ
authors.lastname: Rodríguez-Méndez
authors.forename: José Luis
authors.initials: JL
authors.lastname: Luna-Acosta
authors.forename: Martha
authors.initials: M
authors.lastname: Carranza
authors.forename: Carlos
authors.initials: C
authors.lastname: Arámburo
mesh_terms: D000818:Animals; D001402:B-Lymphocytes / Q000378:metabolism; D002060:Bursa of Fabricius / Q000378:metabolism; D002645:Chickens; D013006:Growth Hormone / Q000378:metabolism*; D007107:Immune System / Q000378:metabolism; D019869:Phosphatidylinositol 3-Kinases / Q000378:metabolism; D051057:Proto-Oncogene Proteins c-akt / Q000378:metabolism
chemical_list: D013006:Growth Hormone; D019869:Phosphatidylinositol 3-Kinases; D051057:Proto-Oncogene Proteins c-akt
keywords: Apoptosis; Bursa of fabricius; Caspase-3; Chicken; Growth hormone (GH); Immune system