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- Cystic Fibrosis (9)
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Articles 1 - 15 of 15
Full-Text Articles in Medicine and Health Sciences
Gene-Based Therapy For Alpha-1 Antitrypsin Deficiency, Christian Mueller, Terence Flotte
Gene-Based Therapy For Alpha-1 Antitrypsin Deficiency, Christian Mueller, Terence Flotte
Christian Mueller
Alpha-1 antitrypsin Deficiency (AATD) has been an attractive target for the development of gene therapy because it is a common single gene disorder, for which there would appear to be significant benefit to be gained for lung disease patients by augmentation of plasma levels of wild-type (M) alpha-1 antitrypsin (AAT). While a significant proportion of patients also have liver disease, which is unlikely to be benefitted by augmentation, the potential to treat or prevent lung disease by replacement of plasma levels to at least 11 microMolar (571 mcg/ml) is the basis upon which several protein replacement therapies have been licensed …
Hepatocyte-Specific Hypoxia-Inducible Factor-1alpha Is A Determinant Of Lipid Accumulation And Liver Injury In Alcohol-Induced Steatosis In Mice, Bharath Nath, Ivan Levin, Timea Csak, Jan Petrasek, Christian Mueller, Karen Kodys, Donna Catalano, Pranoti Mandrekar, Gyongyi Szabo
Hepatocyte-Specific Hypoxia-Inducible Factor-1alpha Is A Determinant Of Lipid Accumulation And Liver Injury In Alcohol-Induced Steatosis In Mice, Bharath Nath, Ivan Levin, Timea Csak, Jan Petrasek, Christian Mueller, Karen Kodys, Donna Catalano, Pranoti Mandrekar, Gyongyi Szabo
Christian Mueller
Chronic alcohol causes hepatic steatosis and liver hypoxia. Hypoxia-regulated hypoxia-inducible factor 1-alpha, (HIF-1alpha) may regulate liporegulatory genes, but the relationship of HIF-1 to steatosis remains unknown. We investigated HIF-1alpha in alcohol-induced hepatic lipid accumulation. Alcohol administration resulted in steatosis, increased liver triglyceride levels, and increased serum alanine aminotransferase (ALT) levels, suggesting liver injury in wild-type (WT) mice. There was increased hepatic HIF-1alpha messenger RNA (mRNA), protein, and DNA-binding activity in alcohol-fed mice compared with controls. Mice engineered with hepatocyte-specific HIF-1 activation (HIF1dPA) had increased HIF-1alpha mRNA, protein, and DNA-binding activity, and alcohol feeding in HIF1dPA mice increased hepatomegaly and hepatic …
Immune Responses In Cystic Fibrosis: Are They Intrinsically Defective?, Dmitry Ratner, Christian Mueller
Immune Responses In Cystic Fibrosis: Are They Intrinsically Defective?, Dmitry Ratner, Christian Mueller
Christian Mueller
Cystic fibrosis (CF), the most common lethal single-gene disorder affecting Northern Europeans and North Americans, is caused by mutations in the cystic fibrosis transmembrane conductance regulator (CFTR) gene. Cftr is a chloride channel and a regulator of other ion channels, and many aspects of the CF phenotype are directly related to ion channel abnormalities attributable to CFTR mutation. Lung disease is the most common limitation to the quantity and quality of life for patients with CF. One aspect that continues to be enigmatic is the observed alterations in innate and adaptive immune responses to certain pathogens. Altered responses to Pseudomonas …
Gene Transfer In The Lung Using Recombinant Adeno-Associated Virus, Alisha Gruntman, Christian Mueller, Terence Flotte, Guangping Gao
Gene Transfer In The Lung Using Recombinant Adeno-Associated Virus, Alisha Gruntman, Christian Mueller, Terence Flotte, Guangping Gao
Christian Mueller
Adeno-associated virus (AAV) is a small replication-deficient DNA virus belonging to the Parvovirinae family. It has a single-stranded ∼4.7-kb genome. Recombinant AAV (rAAV) is created by replacing the viral rep and cap genes with the transgene of interest along with promoter and polyadenylation sequences. The short viral inverted terminal repeats must remain intact for replication and packaging in production, as well as vector genome processing and persistence in the transduction process. The AAV capsid (serotype) determines the tissue tropism of the rAAV vector. In this unit we will discuss serotype selection for lung targeting along with the factors effecting efficient …
Functional Characterization Of A Recombinant Adeno-Associated Virus 5-Pseudotyped Cystic Fibrosis Transmembrane Conductance Regulator Vector, Jeffrey Sirninger, Christian Mueller, Sofia Braag, Qiushi Tang, Hungwen Yue, Carol Detrisac, Thomas Ferkol, William Guggino, Terence Flotte
Functional Characterization Of A Recombinant Adeno-Associated Virus 5-Pseudotyped Cystic Fibrosis Transmembrane Conductance Regulator Vector, Jeffrey Sirninger, Christian Mueller, Sofia Braag, Qiushi Tang, Hungwen Yue, Carol Detrisac, Thomas Ferkol, William Guggino, Terence Flotte
Christian Mueller
Despite extensive experience with recombinant adeno-associated virus (rAAV) 2 vectors in the lung, gene expression has been low in the context of cystic fibrosis (CF) gene therapy, where the large size of the cystic fibrosis transmembrane conductance regulator (CFTR) coding sequence has prompted the use of compact endogenous promoter elements. We evaluated the possibility that gene expression from recombinant adeno-associated virus (rAAV) could be improved by using alternate AAV capsid serotypes that target different cell-surface receptors (i.e., rAAV5) and/or using stronger promoters. The relative activities of the cytomegalovirus (CMV) Rous sarcoma virus (RSV) promoter, the CMV enhancer/beta-actin (CB) promoter combination, …
Cystic Fibrosis Transmembrane Conductance Regulator Deficiency Exacerbates Islet Cell Dysfunction After Beta-Cell Injury, Michael Stalvey, Christian Mueller, Desmond Schatz, Clive Wasserfall, Martha Campbell-Thompson, Douglas Theriaque, Terence Flotte, Mark Atkinson
Cystic Fibrosis Transmembrane Conductance Regulator Deficiency Exacerbates Islet Cell Dysfunction After Beta-Cell Injury, Michael Stalvey, Christian Mueller, Desmond Schatz, Clive Wasserfall, Martha Campbell-Thompson, Douglas Theriaque, Terence Flotte, Mark Atkinson
Christian Mueller
The cause of cystic fibrosis-related diabetes (CFRD) remains unknown, but cystic fibrosis transmembrane conductance regulator (CFTR) mutations contribute directly to multiple aspects of the cystic fibrosis phenotype. We hypothesized that susceptibility to islet dysfunction in cystic fibrosis is determined by the lack of functional CFTR. To address this, glycemia was assessed in CFTR null (CFTR(-/-)), C57BL/6J, and FVB/NJ mice after streptozotocin (STZ)-induced beta-cell injury. Fasting blood glucose levels were similar among age-matched non-STZ-administered animals, but they were significantly higher in CFTR(-/-) mice 4 weeks after STZ administration (288.4 +/- 97.4, 168.4 +/- 35.9, and 188.0 +/- 42.3 mg/dl for CFTR(-/-), …
Enhanced Ige Allergic Response To Aspergillus Fumigatus In Cftr-/- Mice, Christian Mueller, Sofia Braag, John-David Herlihy, Clive Wasserfall, Sarah Chesrown, Harry Nick, Mark Atkinson, Terence Flotte
Enhanced Ige Allergic Response To Aspergillus Fumigatus In Cftr-/- Mice, Christian Mueller, Sofia Braag, John-David Herlihy, Clive Wasserfall, Sarah Chesrown, Harry Nick, Mark Atkinson, Terence Flotte
Christian Mueller
To gain insight into aberrant cytokine regulation in cystic fibrosis (CF), we compared the phenotypic manifestations of allergen challenge in gut-corrected CFTR-deficient mice with background-matched C57Bl6 (B6) mice. Aspergillus fumigatus (Af) antigen was used to mimic allergic bronchopulmonary aspergillosis, a peculiar hyper-IgE syndrome with a high prevalence in CF patients. CFTR-/-, C57BL/6 and FVB/NJ mice were sensitized with Af antigen by serial intraperitoneal injections. Control mice were mock sensitized with PBS. Challenges were performed by inhalation of Af antigen aerosol. After Af antigen challenge, histologic analysis showed goblet cell hyperplasia and lymphocytic infiltration in both strains. However, total serum IgE …
The Pros And Cons Of Immunomodulatory Il-10 Gene Therapy With Recombinant Aav In A Cftr-/- -Dependent Allergy Mouse Model, Christian Mueller, Sofia Braag, A. Martino, Qiushi Tang, M. Campbell-Thompson, Terence Flotte
The Pros And Cons Of Immunomodulatory Il-10 Gene Therapy With Recombinant Aav In A Cftr-/- -Dependent Allergy Mouse Model, Christian Mueller, Sofia Braag, A. Martino, Qiushi Tang, M. Campbell-Thompson, Terence Flotte
Christian Mueller
Cystic fibrosis (CF) patients have decreased levels of lung epithelial interleukin (IL)-10 and increased levels of proinflammatory cytokines (tumor necrosis factor-alpha, IL-4, IL-8 and IL-6). This has also been documented in Cftr (cystic fibrosis transmembrane conductance regulator)-deficient mice (Cftr 489X(-/-), FABP-hCFTR(+/+)). Our laboratory has recently characterized a peculiar hyper-IgE phenotype in these mice, in response to Aspergillus fumigatus crude protein extract (Af-cpe). Thus, we hypothesized that sustained systemic circulating IL-10 levels achieved through skeletal muscle transduction with recombinant adeno-associated vectors expressing IL-10 (rAAV1-IL-10) would serve to downregulate Th1 and Th2 cytokine production. This in turn would dampen the allergic response …
Partial Correction Of The Cftr-Dependent Abpa Mouse Model With Recombinant Adeno-Associated Virus Gene Transfer Of Truncated Cftr Gene, Christian Mueller, Daniel Torrez, Sofia Braag, Ashley Martino, Tracy Clarke, Martha Campbell-Thompson, Terence Flotte
Partial Correction Of The Cftr-Dependent Abpa Mouse Model With Recombinant Adeno-Associated Virus Gene Transfer Of Truncated Cftr Gene, Christian Mueller, Daniel Torrez, Sofia Braag, Ashley Martino, Tracy Clarke, Martha Campbell-Thompson, Terence Flotte
Christian Mueller
Recently, we have developed a model of airway inflammation in a CFTR knockout mouse utilizing Aspergillus fumigatus crude protein extract (Af-cpe) to mimic allergic bronchopulmonary aspergillosis (ABPA) 1, an unusual IgE-mediated hypersensitivity syndrome seen in up to 15% of cystic fibrosis (CF) patients and rarely elsewhere. We hypothesized that replacement of CFTR via targeted gene delivery to airway epithelium would correct aberrant epithelial cytokine signaling and ameliorate the ABPA phenotype in CFTR-deficient (CFTR 489X - /-, FABP-hCFTR + / +) mice. CFTR knockout mice underwent intra-tracheal (IT) delivery of recombinant adeno-associated virus serotype 5 (rAAV5Delta-264CFTR) or rAAV5-GFP at 2.58 x …
N-Glycosylation Augmentation Of The Cystic Fibrosis Epithelium Improves Pseudomonas Aeruginosa Clearance, Ashley Martino, Christian Mueller, Sofia Braag, Pedro Cruz, Martha Campbell-Thompson, Shouguang Jin, Terence Flotte
N-Glycosylation Augmentation Of The Cystic Fibrosis Epithelium Improves Pseudomonas Aeruginosa Clearance, Ashley Martino, Christian Mueller, Sofia Braag, Pedro Cruz, Martha Campbell-Thompson, Shouguang Jin, Terence Flotte
Christian Mueller
Chronic lung colonization with Pseudomonas aeruginosa is anticipated in cystic fibrosis (CF). Abnormal terminal glycosylation has been implicated as a candidate for this condition. We previously reported a down-regulation of mannose-6-phosphate isomerase (MPI) for core N-glycan production in the CFTR-defective human cell line (IB3). We found a 40% decrease in N-glycosylation of IB3 cells compared with CFTR-corrected human cell line (S9), along with a threefold-lower surface attachment of P. aeruginosa strain, PAO1. There was a twofold increase in intracellular bacteria in S9 cells compared with IB3 cells. After a 4-hour clearance period, intracellular bacteria in IB3 cells increased twofold. Comparatively, …
In Vivo Post-Transcriptional Gene Silencing Of Alpha-1 Antitrypsin By Adeno-Associated Virus Vectors Expressing Sirna, Pedro Cruz, Christian Mueller, Travis Cossette, Alexandra Golant, Qiushi Tang, Stuart Beattie, Mark Brantly, Martha Campbell-Thompson, Keith Blomenkamp, Jeffrey Teckman, Terence Flotte
In Vivo Post-Transcriptional Gene Silencing Of Alpha-1 Antitrypsin By Adeno-Associated Virus Vectors Expressing Sirna, Pedro Cruz, Christian Mueller, Travis Cossette, Alexandra Golant, Qiushi Tang, Stuart Beattie, Mark Brantly, Martha Campbell-Thompson, Keith Blomenkamp, Jeffrey Teckman, Terence Flotte
Christian Mueller
alpha-1 Antitrypsin (AAT) deficiency is one of the most common genetic diseases in North America, with a carrier frequency of approximately 4% in the US population. Homozygosity for the most common mutation (Glu342Lys, PI(*)Z) leads to the synthesis of a mutant protein, which accumulates and polymerizes within hepatocytes rather than being efficiently secreted. This lack of secretion causes severe serum deficiency predisposing to chronic lung disease. Twelve to fifteen percent of patients with PI(*)ZZ also develop liver disease, which can be severe, even in infancy. This is thought to be due to toxic effects of the accumulated mutant Z-AAT within …
In Vitro And In Vivo Functional Characterization Of Gutless Recombinant Sv40-Derived Cftr Vectors, Christian Mueller, M. Strayer, Jeffrey Sirninger, Sofia Braag, Francisco Branco, Jean-Pierre Louboutin, Terence Flotte, David Strayer
In Vitro And In Vivo Functional Characterization Of Gutless Recombinant Sv40-Derived Cftr Vectors, Christian Mueller, M. Strayer, Jeffrey Sirninger, Sofia Braag, Francisco Branco, Jean-Pierre Louboutin, Terence Flotte, David Strayer
Christian Mueller
In cystic fibrosis (CF), respiratory failure caused by progressive airway obstruction and tissue damage is primarily a result of the aberrant inflammatory responses to lung infections with Pseudomonas aeruginosa. Despite considerable improvement in patient survival, conventional therapies are mainly supportive. Recent progress toward gene therapy for CF has been encouraging; however, several factors such as immune response and transduced cell turnover remain as potential limitations to CF gene therapy. As alternative gene therapy vectors for CF, we examined the feasibility of using recombinant SV40-derived vectors (rSV40s), which may circumvent some of these obstacles. To accommodate the large cystic fibrosis transmembrane …
Dual Reporter Comparative Indexing Of Raav Pseudotyped Vectors In Chimpanzee Airway, Terence Flotte, Anne Fischer, Jason Goetzmann, Christian Mueller, Liudmila Cebotaru, Ziying Yan, Lilli Wang, James Wilson, William Guggino, John Engelhardt
Dual Reporter Comparative Indexing Of Raav Pseudotyped Vectors In Chimpanzee Airway, Terence Flotte, Anne Fischer, Jason Goetzmann, Christian Mueller, Liudmila Cebotaru, Ziying Yan, Lilli Wang, James Wilson, William Guggino, John Engelhardt
Christian Mueller
Selecting the most efficient recombinant adeno-associated virus (rAAV) serotype for airway gene therapy has been difficult due to cross-specific differences in tropism and immune response between humans and animal models. Chimpanzees--the closest surviving genetic relative of humans--provide a valuable opportunity to select the most effective serotypes for clinical trials in humans. However, designing informative experiments using this protected species is challenging due to limited availability and experimental regulations. We have developed a method using Renilla luciferase (RL) and firefly luciferase (FL) reporters to directly index the relative transduction and immune response of two promising rAAV serotypes following lung coinfection. Analysis …
Gene Therapy For Cystic Fibrosis, Christian Mueller, Terence Flotte
Gene Therapy For Cystic Fibrosis, Christian Mueller, Terence Flotte
Christian Mueller
Cystic Fibrosis (CF) is an autosomal recessive disorder due to mutations in the CF transmembrane conductance regulator (CFTR) gene that lead to defective ion transport in the conducting pulmonary airways and exocrine glands. Through a process that is not fully understood, CFTR defects predispose affected patients to chronic endobronchial infections with organisms such as Pseudomonas aeruginosa and Staphylococcus aureus. Following the discovery of the CFTR gene in 1989, CF became one of the primary targets for gene therapy research. Early enthusiasm surrounded the new field of gene therapy during most of the 1990s and it led academics and clinicians on …
Recombinant Aav Serotype And Capsid Mutant Comparison For Pulmonary Gene Transfer Of Alpha-1-Antitrypsin Using Invasive And Noninvasive Delivery, Rejean Liqun Wang, Thomas Mclaughlin, Travis Cossette, Qiushi Tang, Kevin Foust, Martha Campbell-Thompson, Ashley Martino, Pedro Cruz, Scott Loiler, Christian Mueller, Terence Flotte
Recombinant Aav Serotype And Capsid Mutant Comparison For Pulmonary Gene Transfer Of Alpha-1-Antitrypsin Using Invasive And Noninvasive Delivery, Rejean Liqun Wang, Thomas Mclaughlin, Travis Cossette, Qiushi Tang, Kevin Foust, Martha Campbell-Thompson, Ashley Martino, Pedro Cruz, Scott Loiler, Christian Mueller, Terence Flotte
Christian Mueller
Recombinant adeno-associated viral (rAAV) vectors have been widely used in pulmonary gene therapy research. In this study, we evaluated the transduction and expression efficiencies of several AAV serotypes and AAV2 capsid mutants with specific pulmonary targeting ligands in the mouse lung. The noninvasive intranasal delivery was compared with the traditional intratracheal lung delivery. The rAAV8 was the most efficient serotype at expressing alpha-1-antitrypsin (AAT) in the lung among all the tested serotypes and mutants. A dose of 1 x 10(10) vg of rAAV8-CB-AAT transduced a high percentage of cells in the lung when delivered intratrachealy. The serum and the broncho-alveolar …