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Characterization Of The Role Of Insulin-Like Growth Factor Binding Protein 7 (Igfbp7) Using A Genetic Knockout Mouse Model, Maaged A. Akiel Jan 2017

Characterization Of The Role Of Insulin-Like Growth Factor Binding Protein 7 (Igfbp7) Using A Genetic Knockout Mouse Model, Maaged A. Akiel

Theses and Dissertations

In the US, the incidence and mortality rates of hepatocellular carcinoma (HCC) are alarmingly increasing since no effective therapy is available for the advanced disease. Activation of IGF signaling is a major oncogenic event in diverse cancers, including HCC. Insulin-like growth factor binding protein-7 (IGFBP7) inhibits IGF signaling by binding to IGF-1 receptor (IGF-1R) and functions as a potential tumor suppressor for hepatocellular carcinoma (HCC). IGFBP7 abrogates tumors by inducing cancer-specific senescence and apoptosis and inhibiting angiogenesis. We now document that Igfbp7 knockout (Igfbp7-/- ) mouse shows constitutive activation of IGF signaling, presents with pro-inflammatory and immunosuppressive microenvironment, and develops …

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Role Of Translation Initiation In Regulation Of Epithelial Junctions And Cell Motility, Fahda Fawaz Alsharief Jan 2017

Role Of Translation Initiation In Regulation Of Epithelial Junctions And Cell Motility, Fahda Fawaz Alsharief

Theses and Dissertations

The integrity and barrier properties of intestinal epithelium are determined by specialized adhesive structures known as intercellular junctions; composed of adherens junctions (AJs), tight junctions (TJs) and focal adhesions that mediate cell-cell and cell matrix interactions, respectively. These two types of epithelial cell adhesions regulate each other during disruption and restitution of the epithelial barrier. Inflammatory cytokines such as interferon gamma (IFNγ) and tumor necrosis factor alpha (TNFα) are elevated during intestinal inflammation. The most notable effects of IFNγ and TNFα on intestinal epithelial homeostasis involve disruption of apical junctions and attenuation of cell migration. Although molecular mechanisms underlying these …

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Intravenous Formulation Of Het0016 Decreased Human Glioblastoma Growth And Iimplicated Survival Benefit In Rat Xenograft Models, M Jain, N Gamage, M Alsulami, A Shankar, B Achyut, Austin Guo, A Arbab, A Arbab Jan 2017

Intravenous Formulation Of Het0016 Decreased Human Glioblastoma Growth And Iimplicated Survival Benefit In Rat Xenograft Models, M Jain, N Gamage, M Alsulami, A Shankar, B Achyut, Austin Guo, A Arbab, A Arbab

NYMC Faculty Publications

Glioblastoma (GBM) is a hypervascular primary brain tumor with poor prognosis. HET0016 is a selective CYP450 inhibitor, which has been shown to inhibit angiogenesis and tumor growth. Therefore, to explore novel treatments, we have generated an improved intravenous (IV) formulation of HET0016 with HPssCD and tested in animal models of human and syngeneic GBM. Administration of a single IV dose resulted in 7-fold higher levels of HET0016 in plasma and 3.6-fold higher levels in tumor at 60 min than that in IP route. IV treatment with HPssCD-HET0016 decreased tumor growth, and altered vascular kinetics in early and late treatment groups …

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Tissue Factor Expression, Regulation, And Signaling In Human Airway Cells, Michael D. Davis Jan 2017

Tissue Factor Expression, Regulation, And Signaling In Human Airway Cells, Michael D. Davis

Theses and Dissertations

Rationale: Tissue Factor (TF) is a transmembrane glycoprotein that canonically functions as the initiator of the coagulation cascade. Increased levels of TF have been associated with inflammatory airway diseases. Since lipopolysaccharide (LPS) is known to elicit and inflammatory response in airway epithelium, we hypothesized that airway epithelial cells release TF when exposed to LPS. Since TF aids in local wound healing, we also hypothesized that inhibition of TF would decrease NHBE growth. The specific aim of this work was to evaluate the effects of LPS exposure on TF production and release from airway epithelia and determine the signaling pathways involved. …

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Targeted Therapy Development For Neurofibromatosis Type 2, Marisa Fuse Jan 2017

Targeted Therapy Development For Neurofibromatosis Type 2, Marisa Fuse

Electronic Theses and Dissertations

Neurofibromatosis type 2 (NF2) is a debilitating disease characterized by the formation of bilateral vestibular schwannomas, which compress the vestibulocochlear nerve and cause deafness. Additional peripheral schwannomas, meningiomas and ependymomas may also form. NF2 is caused by mutations in the NF2 gene, resulting in the loss of function of the merlin tumor suppressor. Merlin functions in multiple signaling pathways and its absence in Schwann cells yields increased cell survival and proliferation, thereby causing schwannoma formation. First line treatment for NF2 is watchful waiting and surgical removal of tumors, potentially resulting in facial paralysis and deafness. To date, there are no …

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Analysis Of The Secondary Neurodegenerative Consequences Of Primary Oligodendrocyte Stress Through The Use Of The Novel Obiden Mouse Model, Daniel Zdzislaw Radecki Jan 2017

Analysis Of The Secondary Neurodegenerative Consequences Of Primary Oligodendrocyte Stress Through The Use Of The Novel Obiden Mouse Model, Daniel Zdzislaw Radecki

Wayne State University Dissertations

The work of this project was to develop, test and characterize a potential novel mouse model of the neurodegenerative disease Multiple Sclerosis (MS). Historically, MS has been identified as a primary autoimmune disease of the central nervous system (CNS). However, treatments based on this view have met with limited success, and in most cases, fail to prevent progression of MS from mild to moderate and severe forms. Original observations regarding axonal and neuronal pathology in the white and gray matter of the CNS were rediscovered in the 1990s. These observations indicated that even in the absence of the immune system, …

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The Role Of Hur In Astrocytes In Spinal Cord Injury, Thaddaeus Kwan Jan 2017

The Role Of Hur In Astrocytes In Spinal Cord Injury, Thaddaeus Kwan

All ETDs from UAB

Neuroinflammation is a defining event during the acute phase of spinal cord injury (SCI). The inflammatory cascade is initiated by activated glial cells such as astrocytes and microglia in the milieu of the injured tissue through release of pro-inflammatory cytokines, matrix metalloproteinases, and reactive oxygen species. These soluble factors produce cytotoxicity to neurons and other cells either directly or indirectly by promoting permeabilization of the blood-spinal cord barrier, edema and subsequent ischemia. These factors also serve to recruit and activate additional glia and peripheral immune cells. The mRNAs of many of these soluble factors such as TNFα, IL-1β, CXCL1, and …

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Attachment Of Streptococcus Pneumoniae Capsular Polysaccharide To The Cell, Thomas Robbin Larson Jan 2017

Attachment Of Streptococcus Pneumoniae Capsular Polysaccharide To The Cell, Thomas Robbin Larson

All ETDs from UAB

Streptococcus pneumoniae is an important human pathogen. The major virulence factor for S. pneumoniae is the capsular polysaccharide (CPS). Proper expression and localization of the CPS is essential for pathogenesis. Despite the importance of the proper transfer to the cell surface of this virulence factor, no studies have shown the exact structure and attachment to either the cell wall or membrane. Using the S. pneumoniae serotype 2 CPS as a model, which is synthesized by the widespread Wzy mechanism, we found that the CPS attaches to the cell wall β-D-N-acetylglucosamine (GlcNAc) of peptidoglycan (PG) via a direct glycosidic linkage. This …

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The Role Of Macrophages In Pressure-Overload Induced Cardiac Remodeling, Bindiya Dinesh Patel Jan 2017

The Role Of Macrophages In Pressure-Overload Induced Cardiac Remodeling, Bindiya Dinesh Patel

All ETDs from UAB

Cardiac pressure-overload is a state of increased hemodynamic load and is initially characterized by concentric left ventricular (LV) hypertrophy, but can transition to eccentric hypertrophy and adverse LV remodeling leading to heart failure (HF). Cardiac remodeling during pressure-overload is accompanied by dysregulated collagen deposition, cardiomyocyte hypertrophy, and increased inflammatory signaling. Both clinical and preclinical studies have documented increased expression of inflammatory cytokines and leukocyte infiltration in the pressure-overloaded heart, indicating inflammatory mechanisms are active during cardiac remodeling. Despite the well-known link between leukocyte infiltration and exacerbated tissue injury, the role of innate immune cells, particularly monocytes, macrophages and dendritic cells, …

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Autophagy In Mitochondrial Quality Control And Proteotoxicity In Neurons, Matthew Redmann Jan 2017

Autophagy In Mitochondrial Quality Control And Proteotoxicity In Neurons, Matthew Redmann

All ETDs from UAB

Parkinson’s disease (PD) is the 2nd most common neurodegenerative disorder with aging as a significant risk factor. Sharing with aging brains, postmortem PD brains exhibit cellular deficits including autophagic dysfunction, mitochondrial dysfunction, and intracellular protein aggregates of alpha-synuclein. This dissertation will focus on the interplay between these key disease features. To that end, we coupled primary cortical neuronal cultures from either rats or mice with Seahorse extracellular flux, metabolomics and biochemical techniques. Autophagy is an important cell recycling program responsible for the clearance of damaged proteins and organelles. Bafilomycin A1 and chloroquine are compounds that inhibit autophagy by targeting the …

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Activation Of Ampk To Diminish Sepsis-Induced Lung Injury, Nathaniel Bone Jan 2017

Activation Of Ampk To Diminish Sepsis-Induced Lung Injury, Nathaniel Bone

All ETDs from UAB

Sepsis is the most frequent cause of death of hospitalized patients in modern ICUs. Severe infection, trauma, hemorrhage, burns, and surgery are significant causes of multi-organ injury and immune dysfunction that in turn primes for a high risk of secondary lung infections. In addition to detrimental inflammation, sepsis is linked to loss of metabolic plasticity due to mitochondrial dysfunction in immune cells and lung tissue. In particular, mitochondrial failure in lungs of critically ill septic patients is correlated with high mortality rates. We proposed that AMP-activated protein kinase (AMPK) activation, a major bioenergetic sensor and metabolic regulator, is a plausible …

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Microenvironmental Regulation And Epigenetic Control Of Glioma Pathogenesis, Nathaniel H. Boyd Jan 2017

Microenvironmental Regulation And Epigenetic Control Of Glioma Pathogenesis, Nathaniel H. Boyd

All ETDs from UAB

Tumor microenvironments can promote stem cell maintenance, tumor growth, and therapeutic resistance, findings linked by the tumor initiating cell hypothesis. The ischemic microenvironment characterized by low oxygen and glucose, and acidic stress occurs in both solid tumors and non-neoplastic tissue injury. Standard of care for glioblastoma (GBM) includes the chemotherapy temozolomide, which is not curative due, in part, to residual therapy-resistant brain tumor initiating cells (BTICs). Temozolomide efficacy may be increased by targeting carbonic anhydrase 9 (CAIX), a hypoxia and acidic stress responsive gene important for maintaining the altered pH gradient of tumor cells. Using patient-derived GBM xenograft cells, we …

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Immunobiology Of The Mucosal Response To Helicobacter Pylori In Children, Kyle Brawner Jan 2017

Immunobiology Of The Mucosal Response To Helicobacter Pylori In Children, Kyle Brawner

All ETDs from UAB

Helicobacter pylori colonizes the stomach of approximately one half of the world’s population. However, the vast majority of infected persons remain asymptomatic. The degree of H. pylori-induced gastric inflammation depends on a complex interaction of several factors. In this dissertation, we focus on age as a determinant of gastritis severity. Children are known to respond to H. pylori infection with a stronger T regulatory cell profile compared with infected adults, yet the reason remains unknown. The influence of the microbiota on, and the communication among, cells of the innate immune system shape the nature of the adaptive immune response to …

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Mechanism Of Cytomegalovirus-Induced Mucosal Inflammation, Evida Adiko Dennis Jan 2017

Mechanism Of Cytomegalovirus-Induced Mucosal Inflammation, Evida Adiko Dennis

All ETDs from UAB

Cytomegalovirus (CMV) is an opportunistic β-herpesvirus that causes severe mucosal inflammation in recipients of organ and stem cell transplants, HIV-1-infected subjects, and persons with inflammatory bowel disease. The gastrointestinal mucosa is among the most common sites of CMV inflammatory disease, and the inflammatory lesions associated with CMV mucosal infection contain infected macrophages and increased levels of macrophage-derived cytokines, implicating mucosal macrophages in the inflammatory process. Paradoxically, in healthy human intestinal mucosa, macrophages are profoundly down-regulated for pro-inflammatory responses (inflammation anergy) due to stromal TGF-β-induction of Smad signaling and inactivation of NF-κB. To elucidate the mechanism whereby CMV promotes macrophage-mediated mucosal …

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A Delicate Balancing Act: Curing Humanized Mouse Models Of Cooley’S Anemia By Reducing The Globin Chain Imbalance, Suean D. Fontenard Jan 2017

A Delicate Balancing Act: Curing Humanized Mouse Models Of Cooley’S Anemia By Reducing The Globin Chain Imbalance, Suean D. Fontenard

All ETDs from UAB

Cooley’s Anemia (CA) is a hereditary disease which occurs when an individual inherits two null β-globin alleles. CA presents during the latter part of the first year of life due to the high levels of fetal hemoglobin (HbF) in the circulating red blood cells (RBCs) at birth. The absence of β-globin chains, to dimerize with α-globin chains in the newly formed bone marrow derived erythroblasts, results in premature destruction of the erythroid cells in the marrow and ineffective erythropoiesis. I hypothesized that increas-ing the amount of β-like globin chains for hemoglobin assembly in erythroblasts would lessen disease severity or even …

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O-Acetyltransferase Functionality Mediates Pneumococcal Capsular Diversity, Brady Spencer Jan 2017

O-Acetyltransferase Functionality Mediates Pneumococcal Capsular Diversity, Brady Spencer

All ETDs from UAB

Streptococcus pneumoniae (pneumococcus) is an important human pathogen that asymptomatically colonizes the nasopharynx but can disseminate opportunistically to cause diseases such as otitis media, pneumonia, septicemia, or meningitis. The pneumo-coccal capsular polysaccharide is necessary to prevent opsonophagocytosis as nonencap-sulated pneumococci are largely avirulent. Currently, 98 antigenically distinct capsule types (serotypes) have been identified, which vary in virulence. O-acetylation, a subtle capsular modification, contributes to pneumococcal capsular diversity and modulates capsular physicochemical properties and interaction with innate or vaccine immunity. Replacement serotypes (and future vaccine types) 33F and 15B have O-acetylated capsules due to membrane-bound O-acetyltransferases (MOATs). We hypothesize that future …

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The Role Of Adipocytes And Osteocytes In Multiple Myeloma Progression, Timothy Nathan Trotter Jan 2017

The Role Of Adipocytes And Osteocytes In Multiple Myeloma Progression, Timothy Nathan Trotter

All ETDs from UAB

Multiple myeloma (MM) is a hematological malignancy of plasma cells that is intrinsically tied to the bone marrow (BM). Many cells in the BM microenvironment have been studied in MM, yet there is still much progress to be made. Recent work has revealed two new potential cellular targets in MM: adipocytes and osteocytes. Both are endocrine cells and secrete many molecules that regulate other cells proximally and systemically. Our lab previously showed that MM cells shift osteoblast precursor cells towards adipogenesis through soluble molecules alone. Recent findings also revealed that osteocyte apoptosis is enhanced in MM patients compared to healthy …

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The Role Of Rig-I And Mda5 In Alphavirus Replication, Ivan Viachaslavavich Akhrymuk Jan 2017

The Role Of Rig-I And Mda5 In Alphavirus Replication, Ivan Viachaslavavich Akhrymuk

All ETDs from UAB

Evolution of vertebrates has resulted in the development of a wide range of cellular pattern recognition receptors (PRRs), which detect the presence of virus-specific molecules termed pathogen-associated molecular patterns (PAMPs). Sensing of the incoming viruses and/or their replication by PRRs activates the cascade of cellular pathways that ultimately result in activation of antiviral response. Such response is determined by hundreds of cellular genes, whose products either directly interfere with virus replication or are released from the cells and activate antiviral state in yet uninfected cells. Consequently, the latter cell signaling prevents development of the next rounds of infection both in …

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Phenomic And Metabolomic Analysis Of Chronological Aging In Saccharomyces Cerevisiae, Haley Albright Jan 2017

Phenomic And Metabolomic Analysis Of Chronological Aging In Saccharomyces Cerevisiae, Haley Albright

All ETDs from UAB

Systematic investigation of chronological lifespan (CLS) in the Saccharomyces cerevisiae yeast gene knockout and knockdown (YKO/KD) strains reveals genes, path-ways, and interactions of potential relevance for aging of all eukaryotic cell types. Growth curves obtained by quantitative high-throughput cell array phenotyping (Q-HTCP) of the entire YKO/KD strain collection provide comprehensive snapshots of the influence of each individual gene on CLS. Yeast CLS is also influenced by media com-position, auxotrophic background, and media buffering. We used Q-HTCP to analyze CLS of the YKO/KD libraries, focusing on the interaction between gene networks and media buffering, with respect to their influence on CLS. …

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Ca2+-Independent Phospholipase A2 Beta-Derived Lipid Signals And Osteogenesis, William Hancock Jan 2017

Ca2+-Independent Phospholipase A2 Beta-Derived Lipid Signals And Osteogenesis, William Hancock

All ETDs from UAB

Bone modeling can be modulated by lipid signals and arachidonic acid (AA); its cyclo-oxygenase 2 (COX2) metabolite, prostaglandin E2 (PGE2), is an important mediator of optimal bone formation. Hydrolysis of AA from membrane glycerophospholipids is catalyzed by phospholipases A2 (PLA2s). We reported that mice deficient in the Ca2+-independent PLA2beta (iPLA2β), encoded by PLA2G6, have decreased bone formation, relative to wild type (WT) mouse bones. Here, we examined at the mechanistic and molecular levels the role of iPLA2β in bone formation using bone marrow stromal cells and calvarial osteoblasts from WT and iPLA2β-deficient mice and MC3T3-E1 osteoblast precursor cell line. Our …

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The Function Of Protein Kinase Ck2 In Cd4 T Cell Differentiation And Autoimmunity, Sara Ann Gibson Jan 2017

The Function Of Protein Kinase Ck2 In Cd4 T Cell Differentiation And Autoimmunity, Sara Ann Gibson

All ETDs from UAB

Protein kinase CK2 is a highly conserved serine/threonine kinase essential for cell viability. CK2 exhibits immense pleiotropy and has well characterized interactions with canonical cytosolic signaling pathways such as PI3K/Akt/mTOR and JAK/STAT. These pathways are critical for CD4+ T cell function, and further are known to be aberrantly active in the T cell-driven autoimmune disease Multiple Sclerosis, but little is known as to how CK2 functions in CD4+ T cells or in the context of autoimmune diseases. The current dissertation examines the understudied T cell-specific functions of CK2 utilizing two approaches, pharmacologic inhibition and genetic deletion. We discovered CK2 to …

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A Tissue Engineering Approach To The Development Of A 3d Breast Carcinoma Surrogate, Kayla Goliwas Jan 2017

A Tissue Engineering Approach To The Development Of A 3d Breast Carcinoma Surrogate, Kayla Goliwas

All ETDs from UAB

Tumors are three dimensional tissues consisting of malignant cells and various stromal cell populations within a volume of extracellular matrix. These components form an intricate network that influences many facets of tumor biology. Paracrine interactions between tumor cells and the surrounding microenvironment can alter drug response and impact therapeutic efficacy in vivo, yet most current in vitro models do not accurately recapitulate the stromal microenvironment or associated dimensionality of human tumors. In vitro models that are more representative of the human tumor microenvironment, including a more recapitulative dimensionality and cellular composition, have broad utility in the evaluation of mechanisms driving …

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Evaluating The Genotype Phenotype Correlations In Cleidocranial Dysplasia, Stephen Lamar Greene Jan 2017

Evaluating The Genotype Phenotype Correlations In Cleidocranial Dysplasia, Stephen Lamar Greene

All ETDs from UAB

Cleidocranial dysplasia (CCD, OMIM 119600) is a rare (1 in 1,000,000) human autosomal dominant skeletal disorder with unique craniofacial and dental features caused by mutations the gene coding for transcription factor RUNX2. RUNX2 is a key master regulator of osteoblast differentiation, chondrocyte maturation and tooth formation. CCD is commonly diagnosed based on bone defects with ~90% of cases presenting with supernumerary teeth or a “third dentition”. Mouse Runx2 null models (Runx2+/-), although having similar CCD skeletal defects, do not mimic the human dental phenotype of supernumerary teeth. Instead, Runx2-/- mouse have arrested tooth formation at the cap stage. Furthermore, based …

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Development And Assessment Of Nonsense Suppression Therapies To Ameliorate Disease Progression In A Nonsense Mouse Model Of Mps I Hurler Syndrome, Gwendolyn G. Gunn Jan 2017

Development And Assessment Of Nonsense Suppression Therapies To Ameliorate Disease Progression In A Nonsense Mouse Model Of Mps I Hurler Syndrome, Gwendolyn G. Gunn

All ETDs from UAB

Nonsense mutations introduce a premature termination codon (PTC) into the open reading frame of an mRNA resulting in premature translation termination, loss of functional protein, and rapid degradation of the mutant mRNA. Approximately 11% of human genetic disorders are attributable to a nonsense mutation. Several small molecules have been identified as potential nonsense suppression compounds. These compounds increase the frequency of PTC recognition by near-cognate aminoacyl tRNAs resulting in PTC “readthrough” and restored protein production. Mucopolysaccharidosis type I-Hurler (MPS IH) is the severe form of the autosomal recessive lysosomal storage disorder caused by mutations in the iduronidase (IDUA) gene. 60-80% …

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Streptococcus Pneumoniae In The Heart Subvert The Host Response Through Biofilm-Mediated Resident Macrophage Killing, Anukul T. Shenoy Jan 2017

Streptococcus Pneumoniae In The Heart Subvert The Host Response Through Biofilm-Mediated Resident Macrophage Killing, Anukul T. Shenoy

All ETDs from UAB

During invasive disease, blood circulating Streptococcus pneumoniae are capable of invading the heart and forming bacteria filled cardiac microlesions. These microlesions are devoid of immune cells and disruptive of cardiac functionality. While the mechanisms underlying pneumococcal invasion of the myocardium are well-described, how the heart-invaded pneumococci evade immune detection and clearance is unknown. Since its discovery in 1881, invasive pneumococcal disease has been associated with the presence of extracellular diplococci or short chains in affected tissues. Herein, we show that heart-invaded pneumococci replicate within cellular vesicles and transition into biofilms. Although the host cell permissible for intracellular replication is yet …

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Investigating Novel Methods Of Interaction With Pharmaceutically Relevant Enzymes, Cory T. Reidl Jan 2017

Investigating Novel Methods Of Interaction With Pharmaceutically Relevant Enzymes, Cory T. Reidl

Dissertations

Metalloproteins requiring one or more metal ions for normal function make up 30% of all known proteins, and many critical biological pathways contain at least one metallo-enzyme. Di-nuclear metallo-proteins constitute a large class of these proteins yet we currently lack effective methods of inhibiting these enzymes for the development of new medical therapies, particularly for the discovery of new antibiotics. Our work has focused on developing novel functionalities that selectively interact with di-nuclear catalytic centers, and we are targeting three separate di-zinc-metallo-enzymes that are unique to bacteria and play key roles in their growth and development. These enzymes are DapE, …

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Involvement Of Notch Signaling In Interleukin-4-Stimulated Human Macrophages, Naunpun Sangphech Jan 2017

Involvement Of Notch Signaling In Interleukin-4-Stimulated Human Macrophages, Naunpun Sangphech

Chulalongkorn University Theses and Dissertations (Chula ETD)

Macrophages respond to various stimuli, resulting in distinct effector phenotypes that range from LPS-stimulated proinflammatory to IL-4-activated pro-healing phenotype. The regulatory mechanism of this polarization is not fully understood. Notch signaling pathway is a conserved signaling pathway involved in polarization of macrophages, especially proinflammatory macrophages. However, the role of Notch signaling in IL-4 stimulated macrophages (M(IL-4)) is not well defined. PPARgamma is a signature nuclear receptor in M(IL-4) that function mainly in regulating lipid metabolism. There are many reports that revealed the interaction of Notch signaling and PPARgamma in various cells but not in macrophages. In this study, the interaction …

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Development Of Gold Nanoparticle-Based Lateral Flow Immunoassay For Detection Of Pathogenic Leptospiral Antigen, Prayoon Lae-Ngee Jan 2017

Development Of Gold Nanoparticle-Based Lateral Flow Immunoassay For Detection Of Pathogenic Leptospiral Antigen, Prayoon Lae-Ngee

Chulalongkorn University Theses and Dissertations (Chula ETD)

Leptospirosis, caused by pathogenic Leptospira spp., is a global re-emerging zoonosis and endemic disease in tropical and sub-tropical countries including Thailand. Point-of-care testing (POCT) for rapid diagnosis of leptospirosis is needed for prompt and appropriate treatment particularly in resource-poor settings. Lateral flow immunoassay (LFA)-based POCT devices are rapid, user friendly, cheap, have one-step analysis, and need no sophisticated equipment. LipL32 is a common target for diagnostic tests of leptospirosis because it is the major outer membrane protein (OMP) that is specific and highly conserved among pathogenic Leptospira. This study aimed to develop the gold nanoparticle (AuNP)-based LFA for detection of …

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Characterization Of Antimicrobial-Resistant Nontyphoidal Salmonella Isolated From Humans And Food Animals In Thailand 172252256, Sirirat Luk-In Jan 2017

Characterization Of Antimicrobial-Resistant Nontyphoidal Salmonella Isolated From Humans And Food Animals In Thailand 172252256, Sirirat Luk-In

Chulalongkorn University Theses and Dissertations (Chula ETD)

The emergence and increase of resistance to antimicrobial agents, especially to extended-spectrum cephalosporins (ESCs) and fluoroquinolones in nontyphoidal Salmonella have recently become a serious therapeutic problem. The objectives of this study were to characterize antimicrobial resistance mechanisms, the clonality, and plasmid profiles among nontyphoidal Salmonella isolates from human and food animals in Thailand. A total of 897 nontyphoidal Salmonella isolates, 617 isolates from human and 280 isolates from food animal in Thailand during 2005 to 2007 and 2012 to 2016 were included in this study. The significantly higher resistance rates were found in S. Choleraesuis compared with other serotypes to …

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Antimicrobial Effect Of High Dose Ascorbate In Mouse Model With Bacterial Infection, Chulamartd Wirapakorn Jan 2017

Antimicrobial Effect Of High Dose Ascorbate In Mouse Model With Bacterial Infection, Chulamartd Wirapakorn

Chulalongkorn University Theses and Dissertations (Chula ETD)

Ascorbate or Vitamin C is a vitamin that is important to the body. It contributes to the immunity, involves the collagen formation, acts as an antioxidant and has the ability to destroy cancer cells and bacteria. These abilities depend on the concentration of ascorbate. Bactericidal properties of ascorbate were interesting, especially in the high concentrations. Staphylococcus aureus, Pseudomonas aeruginosa, Acinetobacter baumannii, and Escherichia coli are a common etiologies of nosocomial infection in Thailand and worldwide. These bacteria have developed mechanisms of antibiotics resistance and cause more violence in the disease. Hence, the time-killing assay was used to explore the bactericidal …

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