Project description:In the classical form of α1antitrypsin deficiency a mutant protein accumulates in a polymerized form in the ER of liver cells causing liver damage and carcinogenesis by a gain-of-toxic function mechanism. Recent studies have indicated that the accumulation of mutant α1antitrypsin Z in the ER specifically activates the autophagic response but not the unfolded protein response and that autophagy plays a critical role in disposal of insoluble α1antitrypsin Z. In this study, we used genomic analysis of the liver in a novel transgenic mouse model with inducible expression to screen for changes in gene expression that would potentially define how the liver responds to accumulation of this mutant protein. Experiment Overall Design: Liver RNA from juvenile (6 wk old) male mice inducibly expressing human alpha1-antitrypsin wild type (M) or mutant (Z) form exclusively in the liver was subjected to genomic analysis. Groups: mutant AAT (Z), wild type AAT (M), expressing (4), non-expressing (1); 3 biological replicates/each group. Experiment Overall Design: Groups: mutant AAT (Z), wild type AAT (M), expressing (4), non-expressing (1); 3 biological replicates/each group, all males, 6 weeks of age
Project description:In the classical form of α1antitrypsin deficiency a mutant protein accumulates in a polymerized form in the ER of liver cells causing liver damage and carcinogenesis by a gain-of-toxic function mechanism. Recent studies have indicated that the accumulation of mutant α1antitrypsin Z in the ER specifically activates the autophagic response but not the unfolded protein response and that autophagy plays a critical role in disposal of insoluble α1antitrypsin Z. In this study, we used genomic analysis of the liver in a novel transgenic mouse model with inducible expression to screen for changes in gene expression that would potentially define how the liver responds to accumulation of this mutant protein. Experiment Overall Design: Liver RNA from adult (3 mo old) male mice inducibly expressing human alpha1-antitrypsin wild type (M) or mutant (Z) form exclusively in the liver was subjected to genomic analysis. Groups: mutant AAT (Z), wild type AAT (M), expressing (4), non-expressing (1), wild type littermates (WT); 3 biological replicates/each group
Project description:In this study, we sought to thoroughly characterize the liver pathophysiology of a human transgenic mouse model for alpha-1 antitrypsin deficiency (AATD) with a strong manifestation of AATD-mediated liver disease. Male and female transgenic mice for normal variant human alpha-1 antitrypsin (Pi*M) and mutant human alpha-1 antitrypsin (Pi*Z) at 3 and 6 months of age with a C57BL/6J background were subjected to study. The progression of hepatic accumulation of mutant alpha-1 antitrypsin (ZAAT), hepatocyte injury, steatosis, liver inflammation and fibrotic features of this mouse model were monitored by performing an in vivo study.
Project description:Characterize how Balb/c mice responses to aerosolized LPS (lipopolysaccharide) alone or with intraperitoneal (i.p.) delivery of alpha1-antitrypsin (AAT)
Project description:In the classical form of α1antitrypsin deficiency a mutant protein accumulates in a polymerized form in the ER of liver cells causing liver damage and carcinogenesis by a gain-of-toxic function mechanism. Recent studies have indicated that the accumulation of mutant α1antitrypsin Z in the ER specifically activates the autophagic response but not the unfolded protein response and that autophagy plays a critical role in disposal of insoluble α1antitrypsin Z. In this study, we used genomic analysis of the liver in a novel transgenic mouse model with inducible expression to screen for changes in gene expression that would potentially define how the liver responds to accumulation of this mutant protein. Keywords: genomic analysis, alpha1-antitrypsin deficiency, comparative study, adult animals, inducible expression, liver specific
Project description:Individuals expressing alpha-1-antitrypsin mutant Z protein accumulate misfolded, mutant protein in the liver and are at risk for liver diseases including cirrhosis and hepatocellular carcinoma. Transgenic PiZ mice, a model for this liver disease, display similar pathologies to humans, including inflammation, increases in proliferation, autophagy and apoptosis, accumulation of globules and develop fibrosis and hepatocellular carcinoma with age. Microarrays were used to compare the gene expressions of PiZ mice to wild-type mice in order to identify the pathways that are altered in this disorder.
Project description:In this study, we performed the gene expression analysis of the Normal, Diabetic and AAT treated NOD mice to elucidate the transcriptional changes induced by AAT. This will assist in identifying the biological processes / pathways involved in curative mechanism of AAT. Keywords: alpha1 antitrypsin treatment
Project description:Individuals expressing alpha-1-antitrypsin mutant Z protein accumulate misfolded, mutant protein in the liver and are at risk for liver diseases including cirrhosis and hepatocellular carcinoma. Transgenic PiZ mice, a model for this liver disease, display similar pathologies to humans, including inflammation, increases in proliferation, autophagy and apoptosis, accumulation of globules and develop fibrosis and hepatocellular carcinoma with age. Microarrays were used to compare the gene expressions of PiZ mice to wild-type mice in order to identify the pathways that are altered in this disorder. Pooled samples from 4 mice, 3-4 months old were used for each of 4 categories. PiZ males, PiZ females, C57Bl/6 males, C57Bl/6 females
