Human sgp130 ELISA Kit

Supplementing interleukin-6 (IL6) to in vitro-produced bovine embryos increases inner cell mass (ICM) cell numbers in blastocysts. A series of studies were completed to further dissect this effect. Treatment with IL6 increased ICM cell numbers in early, regular and expanded blastocysts but had no effect on morulae total cell number. Treatment with IL6 for 30min induced signal transducer and activator of transcription 3 (STAT3) phosphorylation and nuclear translocation in all blastomeres in early morulae and specifically within the ICM in blastocysts. Also, IL6 supplementation increased SOCS3 mRNA abundance, a STAT3-responsive gene, in blastocysts. Chemical inhibition of Janus kinase (JAK) activity from day 5 to day 8 prevented STAT3 activation and the IL6-induced ICM cell number increase. Global transcriptome analysis of blastocysts found that transcripts for IL6 and its receptor subunits (IL6R and IL6ST) were the most abundantly expressed IL6 family ligand and receptors. These results indicate that IL6 increases ICM cell numbers as the ICM lineage emerges at the early blastocyst stage through a STAT3-dependent mechanism. Also, IL6 appears to be the primary IL6 cytokine family member utilized by bovine blastocysts to control ICM cell numbers.

Freezing reaction (catalepsy) is a natural passive defensive strategy in animals. An exaggerated form of catalepsy is a symptom of grave brain dysfunction. Catalepsy in mice was shown to be linked to the Map3k1, Il6st, Gzmk, and Hspb3 genes as potential candidates for a high predisposition to catalepsy. The study sought to test the hypothesis of an association between catalepsy and expression of these genes in the brain. The genes' mRNA levels were measured in the hypothalamus, hippocampus, frontal cortex, striatum, and midbrain of catalepsy-resistant AKR/J strain and catalepsy-prone strains CBA/Lac, ASC (antidepressant-sensitive cataleptic) and the congenic line AKR. CBA-D13M76C. No association between expression of any investigated genes and predisposition to catalepsy was found. At the same time, multivariate analysis revealed interactions among the expressions of Map3k1, Il6st, Gzmk, and Hspb3 genes in the brain structures. A factor analysis of all variables produced two independent factors explaining 76.2% of the total variance. The catalepsy-resistant AKR strain was distinguished from the catalepsy-prone strains CBA, ASC, and AKR. CBA-D13M76C by factor 1. It was suggested that a high predisposition to catalepsy in mice can be defined by the Map3k1, Il6st, Gzmk, and Hspb3 genes' coexpression network. (C) 2010 Wiley-Liss, Inc.