TY - JOUR
T1 - Astrocyte-specific deficiency of interleukin-6 and its receptor reveal specific roles in survival, body weight and behavior
AU - Quintana, Albert
AU - Erta, Maria
AU - Ferrer, Beatriz
AU - Comes, Gemma
AU - Giralt, Mercedes
AU - Hidalgo, Juan
N1 - Funding Information:
The authors acknowledge the collaboration of the Unit of Transgenic Animals, CBATEG, from the Universitat Autònoma de Barcelona, for generating the IL-6 floxed mice, and especially the collaboration of Richard Palmiter for the generation of the IL-6 construct. The help of Jordi Marin with the HB and EPM programs is gratefully acknowledged. This work was supported by SAF2008-00435, SAF2011-23272, FP6 Integrated Project Exgenesis ( LSHM-CT-2004-005272 ), and by Instituto de Salud Carlos III and Ministerio de Ciencia e Innovación-Fondo Europeo de Desarrollo Regional (FEDER), ref. RETICS ( REEM, RD07/0060/0002 ) to JH. Maria Erta gratefully acknowledges a PhD fellowship from UAB.
PY - 2013/1
Y1 - 2013/1
N2 - Interleukin-6 (IL-6) is a major cytokine which controls not only the immune system but also exhibits many other functions including effects in the central nervous system (CNS). IL-6 is known to be produced by different cells in the CNS, and all the major CNS do respond to IL-6, which makes it difficult to dissect the specific roles of each cell type when assessing the role of IL-6 in the brain. We have produced for the first time floxed mice for IL-6 and have crossed them with GFAP-Cre mice to delete IL-6 in astrocytes (Ast-IL-6 KO mice), and have compared their phenotype with that of mice with deletion of IL-6 receptor in astrocytes (Ast-IL6R KO mice). Our results indicate a major prosurvival role of the astrocyte IL-6 system at early ages (intrauterine life), which was also involved to various degrees in the control of adult body weight, locomotor activity, anxiety and exploratory behaviors. In some occasions deleting IL-6R in astrocytes mimicked the phenotype of Ast-IL-6 KO mice (i.e. activity), while in others the opposite was observed (i.e. exploration), suggesting autocrine and paracrine (presumably on neurons) roles of astrocyte IL-6. Our results suggest important roles of the astrocyte IL-6 system on normal brain physiology, in some cases totally unexpected from previous results with total IL-6 KO mice.
AB - Interleukin-6 (IL-6) is a major cytokine which controls not only the immune system but also exhibits many other functions including effects in the central nervous system (CNS). IL-6 is known to be produced by different cells in the CNS, and all the major CNS do respond to IL-6, which makes it difficult to dissect the specific roles of each cell type when assessing the role of IL-6 in the brain. We have produced for the first time floxed mice for IL-6 and have crossed them with GFAP-Cre mice to delete IL-6 in astrocytes (Ast-IL-6 KO mice), and have compared their phenotype with that of mice with deletion of IL-6 receptor in astrocytes (Ast-IL6R KO mice). Our results indicate a major prosurvival role of the astrocyte IL-6 system at early ages (intrauterine life), which was also involved to various degrees in the control of adult body weight, locomotor activity, anxiety and exploratory behaviors. In some occasions deleting IL-6R in astrocytes mimicked the phenotype of Ast-IL-6 KO mice (i.e. activity), while in others the opposite was observed (i.e. exploration), suggesting autocrine and paracrine (presumably on neurons) roles of astrocyte IL-6. Our results suggest important roles of the astrocyte IL-6 system on normal brain physiology, in some cases totally unexpected from previous results with total IL-6 KO mice.
KW - Astrocyte
KW - Body weight
KW - Interleukin-6
KW - Intrauterine survival
KW - Normal behavior
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U2 - 10.1016/j.bbi.2012.10.011
DO - 10.1016/j.bbi.2012.10.011
M3 - Article
C2 - 23085146
AN - SCOPUS:84870765562
SN - 0889-1591
VL - 27
SP - 162
EP - 173
JO - Brain, Behavior, and Immunity
JF - Brain, Behavior, and Immunity
IS - 1
ER -