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Articles 901 - 930 of 6985

Full-Text Articles in Biochemistry

Metabolic Disruption Induced By Mtor Signaling Pathway Inhibition In Regulatory T-Cell Expansion For Clinical Application, Roberto Gedaly, Gabriel Orozco, Alexandre P. Ancheta, Mackenzie Donoho, Siddharth Desai, Fanny Chapelin, Aman Khurana, Lillie J. Lewis, Cuiping Zhang, Francesc Marti Aug 2023

Metabolic Disruption Induced By Mtor Signaling Pathway Inhibition In Regulatory T-Cell Expansion For Clinical Application, Roberto Gedaly, Gabriel Orozco, Alexandre P. Ancheta, Mackenzie Donoho, Siddharth Desai, Fanny Chapelin, Aman Khurana, Lillie J. Lewis, Cuiping Zhang, Francesc Marti

Markey Cancer Center Faculty Publications

Background: Regulatory T cell (Treg) therapy is considered an alternative approach to induce tolerance in transplantation. If successful, this therapy may have implications on immunosuppression minimization/withdrawal to reduce drug-induced toxicity in patients. The aim of this study was to assess the efficacy of the mTORC1/C2 inhibitor, AZD8055, in the manufacturing of clinically competent Treg cells and compare the effects with those induced by rapamycin (RAPA), another mTOR inhibitor commonly used in Treg expansion protocols.

Methods: Primary human Treg cells were isolated from leukapheresis product. Cell viability, expansion rates, suppressive function, autophagy, mitochondrial unfolded protein response (mitoUPR), and cell metabolic profile …


The S1p Receptor 1 Antagonist Ponesimod Reduces Tlr4-Induced Neuroinflammation And Increases Aβ Clearance In 5xfad Mice, Zhihui Zhu, Liping Zhang, Ahmed Elsherbini, Simone M. Crivelli, Priyanka Tripathi, Carmen Harper, Zainuddin Quadri, Stefka D. Spassieva, Erhard Bieberich Aug 2023

The S1p Receptor 1 Antagonist Ponesimod Reduces Tlr4-Induced Neuroinflammation And Increases Aβ Clearance In 5xfad Mice, Zhihui Zhu, Liping Zhang, Ahmed Elsherbini, Simone M. Crivelli, Priyanka Tripathi, Carmen Harper, Zainuddin Quadri, Stefka D. Spassieva, Erhard Bieberich

Markey Cancer Center Faculty Publications

Background Previously, we showed that the sphingosine-1-phosphate (S1P) transporter spinster 2 (Spns2) mediates activation of microglia in response to amyloid β peptide (Aβ). Here, we investigated if Ponesimod, a functional S1P receptor 1 (S1PR1) antagonist, prevents Aβ-induced activation of glial cells and Alzheimer’s disease (AD) pathology.

Methods We used primary cultures of glial cells and the 5XFAD mouse model to determine the effect of Aβ and Ponesimod on glial activation, Aβ phagocytosis, cytokine levels and pro-inflammatory signaling pathways, AD pathology, and cognitive performance.

Findings Aβ42 increased the levels of TLR4 and S1PR1, leading to their complex formation. Ponesimod prevented the …


Fbg Αc 389 – 402 Modulates Factor Xiii Crosslinking In The Fibrinogen Αc Region., Francis Dean Orlina Ablan Aug 2023

Fbg Αc 389 – 402 Modulates Factor Xiii Crosslinking In The Fibrinogen Αc Region., Francis Dean Orlina Ablan

Electronic Theses and Dissertations

Fibrinogen (Fbg) is a coagulation protein critical for clot formation. Coagulation Factor XIII (FXIII) is a calcium-dependent transglutaminase that crosslinks reactive glutamines (Q) and lysines (K) between fibrin and other anti-fibrinolytic proteins. In the presence of Ca2+, FXIII could be activated non-proteolytically (FXIII-A°), or proteolytically by thrombin (FXIII-A*). Significant increases in clot stability and red blood cell retention are linked to FXIII activity in the fibrinogen αC region (Fbg Aα 221 – 610). This region contains several FXIII-reactive glutamines and lysines, as well as a binding site for FXIII-A* (Fbg αC 389 – 402) that includes a key …


Fatty Acids And Parasitism: Towards A Better Understanding Of Lipid Metabolism In Trypanosoma Brucei, Joshua Saliutama Aug 2023

Fatty Acids And Parasitism: Towards A Better Understanding Of Lipid Metabolism In Trypanosoma Brucei, Joshua Saliutama

All Dissertations

Trypanosoma brucei is an extracellular eukaryotic parasite that causes sleeping sickness in humans and cattle. As an extracellular parasite, T. brucei relies on the host’s nutrients to satisfy its growth requirements. The parasite is unusual because it does not uptake most of the host’s lipid species. Instead, T. brucei prefers to perform de novo synthesis of most lipid species. One of the lipid species that T. brucei can both uptake and synthesize is fatty acids. In my thesis work, I investigated the dynamics of fatty acid uptake, metabolism, and utilization of T. brucei. My work starts by determining the …


Biochemical Characterization Of Ssb1, Ssb2, Sycp3, And Meilb2 In Meiotic Recombination, Garrett Buzzard Aug 2023

Biochemical Characterization Of Ssb1, Ssb2, Sycp3, And Meilb2 In Meiotic Recombination, Garrett Buzzard

All Dissertations

The genome is constantly at risk to damage from environmental and normal cellular processes. Double-strand breaks (DSBs) are one of the most deleterious forms of DNA damage as unrepaired DSBs ultimately result in cell death. Homologous recombination (HR) is a conserved DNA repair pathway that utilizes a homologous chromosome as a template for DNA synthesis to repair the DSBs relatively error-free. HR is active in both mitotic and meiotic cells but meiotic HR is initiated by the introduction of programmed DSBs into the genome. The process of HR repairs the DSBs and results in a physical connection between homologous chromosomes …


Methods To Study Activity Dependent Protein Synthesis In Autism Spectrum Disorder, Megan Webb, Karin F K Ejendal, Tamara L. Kinzer-Ursem Jul 2023

Methods To Study Activity Dependent Protein Synthesis In Autism Spectrum Disorder, Megan Webb, Karin F K Ejendal, Tamara L. Kinzer-Ursem

Discovery Undergraduate Interdisciplinary Research Internship

It is estimated by the World Health Organization that 1 in 100 children have autism spectrum disorder (ASD), a condition characterized by neurological differences that may impact a person’s learning or behavior. Clinically, ASD symptoms are alleviated with behavioral or pharmacological therapies, however, not all patients respond to these interventions. Deep brain stimulation (DBS) is a promising treatment of Parkinson’s disease that could also be effective in treating ASD. SynGAP1 is a protein involved in neuronal action that is crucial for regulating synaptic plasticity. Mutations in the SYNGAP1 gene causing haploinsufficiency can result in the manifestation of ASD symptoms. This …


Investigating Gene Looping In Yeast, Abbie Bangs, Justin Peters Jul 2023

Investigating Gene Looping In Yeast, Abbie Bangs, Justin Peters

Summer Undergraduate Research Program (SURP) Symposium

Saccharomyces cerevisiae, also known as brewer’s yeast, is the model organism we chose to interrogate a possible length dependence of gene looping. Gene looping occurs when the promoter and the terminator regions of a gene come together in a physical interaction to form a loop. RNA polymerase transcribes the gene at an amplified rate due to the gene loop (Figure 1), but little research exists as to what factors are important for this process, including the mechanics of the underlying DNA.


Analysis Of Biologically Active Secondary Metabolites From Fungi, Elizabeth E. Guevara, Kirk Manfredi Jul 2023

Analysis Of Biologically Active Secondary Metabolites From Fungi, Elizabeth E. Guevara, Kirk Manfredi

Summer Undergraduate Research Program (SURP) Symposium

Fungi produce secondary metabolites, which are organic compounds that allow the organism to be competitive in their environment. Secondary metabolites are not involved in growth and development, instead they affect ecological interactions to increase survivability. These compounds will often have antimicrobial properties, leading to their use in antibiotics. Isolating a compound with significant antimicrobial activity could lead to its use in therapeutic antibiotics. New antibiotics are needed to address the growing issue of antimicrobial resistant bacteria. This project explores the antimicrobial compounds produced by fungi collected Wind Cave National Park or carried by local insects. Accurate taxonomic identification of the …


Cobalt-Sulfur Coordination Chemistry Drives B12 Loading Onto Methionine Synthase, Romila Mascarenhas, Arkajit Guha, Zhu Li, Markus Ruetz, Sojin An, Javier Seravalli, Ruma Banerjee Jul 2023

Cobalt-Sulfur Coordination Chemistry Drives B12 Loading Onto Methionine Synthase, Romila Mascarenhas, Arkajit Guha, Zhu Li, Markus Ruetz, Sojin An, Javier Seravalli, Ruma Banerjee

Department of Biochemistry: Faculty Publications

Cobalt-sulfur (Co-S) coordination is labile to both oxidation and reduction chemistry and is rarely seen in Nature. Cobalamin (or vitamin B12) is an essential cobalt-containing organometallic cofactor in mammals, and is escorted via an intricate network of chaperones to a single cytoplasmic target, methionine synthase. In this study, we report that the human cobalamin trafficking protein, MMADHC, exploits the chemical lability of Co-S coordination, for cofactor off-loading onto methionine synthase. Cys-261 on MMADHC serves as the -axial ligand to cobalamin. Complex formation between MMADHC and methionine synthase is signaled by loss of the lower axial nitrogen ligand, leading to five-coordinate …


C···O And Si···O Tetrel Bonds: Substituent Effects And Transfer Of The Sif3 Group, Zhihao Niu, Qiaozhuo Wu, Qingzhong Li, Steve Scheiner Jul 2023

C···O And Si···O Tetrel Bonds: Substituent Effects And Transfer Of The Sif3 Group, Zhihao Niu, Qiaozhuo Wu, Qingzhong Li, Steve Scheiner

Chemistry and Biochemistry Faculty Publications

The tetrel bond (TB) between 1,2-benzisothiazol-3-one-2-TF3-1,1-dioxide (T = C, Si) and the O atom of pyridine-1-oxide (PO) and its derivatives (PO-X, X = H, NO2, CN, F, CH3, OH, OCH3, NH2, and Li) is examined by quantum chemical means. The Si···O TB is quite strong, with interaction energies approaching a maximum of nearly 70 kcal/mol, while the C···O TB is an order of magnitude weaker, with interaction energies between 2.0 and 2.6 kcal/mol. An electron-withdrawing substituent on the Lewis base weakens this TB, while an electron-donating group has the opposite …


A Cost-Effective And Smart Sensing Tissue-Like Testbed For Surgical Training, Lysette Zaragoza Jul 2023

A Cost-Effective And Smart Sensing Tissue-Like Testbed For Surgical Training, Lysette Zaragoza

McNair Research Journal SJSU

A low-cost tissue-like testbed with six nodes of varying stiffness was developed for surgical training to provide pressure and force feedback data through image reception to human operators. Using SolidWorks, a 3D model of the box trainer housing was created. A pad for the distribution of smartsensing nodes and microcontroller connections was designed with open spaces for the respective components. The pad was 3D-printed with PLA filament. Flat piezoelectric pressure sensors were fabricated with conductive materials and velostat sensor material. Using static and dynamic analyses, three top sensors were chosen to be used in three pressure sensing nodes. A calibration …


Ranchsatdb: A Genome-Wide Simple Sequence Repeat (Ssr) Markers Database Of Livestock Species For Mutant Germplasm Characterization And Improving Farm Animal Health, Naveen Duhan, Simardeep Kaur, Rakesh Kaundal Jul 2023

Ranchsatdb: A Genome-Wide Simple Sequence Repeat (Ssr) Markers Database Of Livestock Species For Mutant Germplasm Characterization And Improving Farm Animal Health, Naveen Duhan, Simardeep Kaur, Rakesh Kaundal

Plants, Soils and Climate Student Research

Microsatellites, also known as simple sequence repeats (SSRs), are polymorphic loci that play an important role in genome research, animal breeding, and disease control. Ranch animals are important components of agricultural landscape. The ranch animal SSR database, ranchSATdb, is a web resource which contains 15,520,263 putative SSR markers. This database provides a comprehensive tool for performing end-to-end marker selection, from SSRs prediction to generating marker primers and their cross-species feasibility, visualization of the resulting markers, and finding similarities between the genomic repeat sequences all in one place without the need to switch between other resources. The user-friendly online interface …


Mechanisms Of Fibrillar Aggregation Of The Lens Small Heat Shock Proteins, Αa- And Αb-Crystallin, Russell James Mcfarland Jul 2023

Mechanisms Of Fibrillar Aggregation Of The Lens Small Heat Shock Proteins, Αa- And Αb-Crystallin, Russell James Mcfarland

Dissertations and Theses

The protein αB-crystallin represents the archetypical small heat-shock protein (sHSP), and together with αA-crystallin makes up the primary chaperone system in the eye lens, where they play a critical role in maintaining proteostasis. To achieve transparency, the lens undergoes a loss of organelles and both protein turnover halts, requiring that proteins remain functional for long periods of time as they accumulate chemical damage. The α-crystallins are highly abundant in the lens to stabilize proteostasis for multiple decades. Over time though, the small heat-shock proteins become overwhelmed by a high burden of destabilized clients and their own accumulated chemical damage. Mechanistic …


Pyrroline-5-Carboxylate Reductase-2 Promotes Colorectal Carcinogenesis By Modulating Microtubule-Associated Serine/Threonine Kinase-Like/Wnt/Β-Catenin Signaling, Raju Lama Tamang, Balawant Kumar, Sagar M. Patel, Ishwor Thapa, Alshomrani Ahmad, Vikas Kumar, Rizwan Ahmad, Donald F. Becker, Dundy Kiran Bastola, Punita Dhawan, Amar B. Singh Jul 2023

Pyrroline-5-Carboxylate Reductase-2 Promotes Colorectal Carcinogenesis By Modulating Microtubule-Associated Serine/Threonine Kinase-Like/Wnt/Β-Catenin Signaling, Raju Lama Tamang, Balawant Kumar, Sagar M. Patel, Ishwor Thapa, Alshomrani Ahmad, Vikas Kumar, Rizwan Ahmad, Donald F. Becker, Dundy Kiran Bastola, Punita Dhawan, Amar B. Singh

Department of Biochemistry: Faculty Publications

Background: Despite significant progress in clinical management, colorectal cancer (CRC) remains the third most common cause of cancer-related deaths. A positive association between PYCR2 (pyrroline-5-carboxylate reductase-2), a terminal enzyme of proline metabolism, and CRC aggressiveness was recently reported. However, how PYCR2 promotes colon carcinogenesis remains ill understood. Methods: A comprehensive analysis was performed using publicly available cancer databases and CRC patient cohorts. Proteomics and biochemical evaluations were performed along with genetic manipulations and in vivo tumor growth assays to gain a mechanistic understanding. Results: PYCR2 expression was significantly upregulated in CRC and associated with poor patient survival, specifically among PYCR …


Editorial: Rising Stars In Microbial Physiology And Metabolism: 2022, Nicole R. Buan, Ulrike Kappler Jul 2023

Editorial: Rising Stars In Microbial Physiology And Metabolism: 2022, Nicole R. Buan, Ulrike Kappler

Department of Biochemistry: Faculty Publications

This Research Topic was initiated to highlight work by young authors, the rising stars in the field of microbial physiology and metabolism. Microbial physiology and metabolism is an interdisciplinary field of research that seeks to uncover how the metabolic pathways of a cell work together to determine cell fate and function, whether that be growth, replication, pathogenicity, predation, respiration and fermentation, homeostasis or death. Ultimately, researchers like the ones featured here seek to integrate biological information and physicochemical parameters to try to find the underlying rules governing microbial function so that we can understand, predict and design microbes and microbial …


Proteomic Approaches To Identify Unique And Shared Substrates Among Kinase Family Members, Charles Lincoln Howarth Jul 2023

Proteomic Approaches To Identify Unique And Shared Substrates Among Kinase Family Members, Charles Lincoln Howarth

Dartmouth College Ph.D Dissertations

Protein phosphorylation is a reversible post-translational modification that is a critical component of almost all signaling pathways. Kinases regulate substrate proteins through phosphorylation, and nearly all proteins are phosphorylated to some extent. Crucially, breakdown in phosphorylation signaling is an underlying factor in many diseases, including cancer. Understanding how phosphorylation signaling mediates cellular pathways is crucial for understanding cell biology and human disease.

Targeted protein degradation (TPD) is a strategy to rapidly deplete a protein of interest (POI) and is applicable to any gene that is amenable to CRISPR-Cas9 editing. One TPD approach is the auxin-inducible degron (AID) system, which relies …


Chloroquine And Cytosolic Galectins Affect Endosomal Escape Of Antisense Oligonucleotides After Stabilin-Mediated Endocytosis, Ekta Pandey, Ed Harris Jul 2023

Chloroquine And Cytosolic Galectins Affect Endosomal Escape Of Antisense Oligonucleotides After Stabilin-Mediated Endocytosis, Ekta Pandey, Ed Harris

Department of Biochemistry: Faculty Publications

Non-DNA-binding Stabilin-2/HARE receptors expressed on liver sinusoidal endothelial cells specifically bind to and internalize several classes of phosphorothioate antisense oligonucleotides (PS-ASOs). After Stabilin-mediated uptake, PS-ASOs are trafficked within endosomes (>97%–99%), ultimately resulting in destruction in the lysosome. The ASO entrapment in endosomes lowers therapeutic efficacy, thereby increasing the overall dose for patients. Here, we use confocal microscopy to characterize the intracellular route transverse by PS-ASOs after Stabilin receptor-mediated uptake in stable recombinant Stabilin-1 and -2 cell lines. We found that PS-ASOs as well as the Stabilin-2 receptor transverse the classic path: clathrincoated vesicle-early endosome-late endosome-lysosome. Chloroquine exposure facilitated endosomal …


Disease-Associated Mutation A554v Disrupts Normal Autoinhibition Of Dnmt1, Rebecca L. Switzer, Zach J. Hartman, Geoffrey R. Hewett, Clara F. Carroll Jul 2023

Disease-Associated Mutation A554v Disrupts Normal Autoinhibition Of Dnmt1, Rebecca L. Switzer, Zach J. Hartman, Geoffrey R. Hewett, Clara F. Carroll

Faculty Journal Articles

DNA methyltransferase 1 (DNMT1) is the enzyme primarily responsible for propagation of the methylation pattern in cells. Mutations in DNMT1 have been linked to the development of adult-onset neurodegenerative disorders; these disease-associated mutations occur in the regulatory replication foci-targeting sequence (RFTS) domain of the protein. The RFTS domain is an endogenous inhibitor of DNMT1 activity that binds to the active site and prevents DNA binding. Here, we examine the impact of the disease-associated mutation A554V on normal RFTS-mediated inhibition of DNMT1. Wild-type and mutant proteins were expressed and purified to homogeneity for biochemical characterization. The mutation increased DNA binding affinity …


High-Resolution Cryo-Em Structure Of The Pseudomonas Bacteriophage E217, Fenglin Li, Chun-Feng Hou, Ravi K. Lokareddy, Ruoyu Yang, Francesca Forti, Federica Briani, Gino Cingolani Jul 2023

High-Resolution Cryo-Em Structure Of The Pseudomonas Bacteriophage E217, Fenglin Li, Chun-Feng Hou, Ravi K. Lokareddy, Ruoyu Yang, Francesca Forti, Federica Briani, Gino Cingolani

Department of Biochemistry and Molecular Biology Faculty Papers

E217 is a Pseudomonas phage used in an experimental cocktail to eradicate cystic fibrosis-associated Pseudomonas aeruginosa. Here, we describe the structure of the whole E217 virion before and after DNA ejection at 3.1 Å and 4.5 Å resolution, respectively, determined using cryogenic electron microscopy (cryo-EM). We identify and build de novo structures for 19 unique E217 gene products, resolve the tail genome-ejection machine in both extended and contracted states, and decipher the complete architecture of the baseplate formed by 66 polypeptide chains. We also determine that E217 recognizes the host O-antigen as a receptor, and we resolve the N-terminal portion …


Fibrosis-The Tale Of H3k27 Histone Methyltransferases And Demethylases, Morgan D. Basta, Svetlana Petruk, Alexander Mazo, Janice L. Walker Jul 2023

Fibrosis-The Tale Of H3k27 Histone Methyltransferases And Demethylases, Morgan D. Basta, Svetlana Petruk, Alexander Mazo, Janice L. Walker

Department of Biochemistry and Molecular Biology Faculty Papers

Fibrosis, or excessive scarring, is characterized by the emergence of alpha-smooth muscle actin (αSMA)-expressing myofibroblasts and the excessive accumulation of fibrotic extracellular matrix (ECM). Currently, there is a lack of effective treatment options for fibrosis, highlighting an unmet need to identify new therapeutic targets. The acquisition of a fibrotic phenotype is associated with changes in chromatin structure, a key determinant of gene transcription activation and repression. The major repressive histone mark, H3K27me3, has been linked to dynamic changes in gene expression in fibrosis through alterations in chromatin structure. H3K27-specific homologous histone methylase (HMT) enzymes, Enhancer of zeste 1 and 2 …


A Novel Method Of Rapid Detection For Heavy Metal Copper Ion Via A Specific Copper Chelator Bathocuproinedisulfonic Acid Disodium Salt, Yali Wang, Tinglin Ma, Joseph Brake, Zhaoyue Sun, Jiayu Huang, Jing Li, Xiaobin Wu Jul 2023

A Novel Method Of Rapid Detection For Heavy Metal Copper Ion Via A Specific Copper Chelator Bathocuproinedisulfonic Acid Disodium Salt, Yali Wang, Tinglin Ma, Joseph Brake, Zhaoyue Sun, Jiayu Huang, Jing Li, Xiaobin Wu

Department of Biochemistry: Faculty Publications

The extensive usage and production of copper may lead to toxic effects in organisms due to its accumulation in the environment. Traditional methods for copper detection are time consuming and infeasible for field usage. It is necessary to discover a real-time, rapid and economical method for detecting copper to ensure human health and environmental safety. Here we developed a colorimetric paper strip method and optimized spectrum method for rapid detection of copper ion based on the specific copper chelator bathocuproinedisulfonic acid disodium salt (BCS). Both biological assays and chemical methods verified the specificity of BCS for copper. The optimized reaction …


Invited Review: Adrenocortical Function In Avian And Non-Avian Reptiles: Insights From Dispersed Adrenocortical Cells., Rocco V. Carsia, Patrick J. Mcilroy, Henry B John-Alder Jul 2023

Invited Review: Adrenocortical Function In Avian And Non-Avian Reptiles: Insights From Dispersed Adrenocortical Cells., Rocco V. Carsia, Patrick J. Mcilroy, Henry B John-Alder

Rowan-Virtua School of Osteopathic Medicine Departmental Research

Herein we review our work involving dispersed adrenocortical cells from several lizard species: the Eastern Fence Lizard (Sceloporus undulatus), Yarrow's Spiny Lizard (Sceloporus jarrovii), Striped Plateau Lizard (Sceloporus virgatus) and the Yucatán Banded Gecko (Coleonyx elegans). Early work demonstrated changes in steroidogenic function of adrenocortical cells derived from adult S. undulatus associated with seasonal interactions with sex. However, new information suggests that both sexes operate within the same steroidogenic budget over season. The observed sex effect was further explored in orchiectomized and ovariectomized lizards, some supported with exogenous testosterone. Overall, a suppressive effect of testosterone was evident, especially in cells …


Long-Term Monitoring Of Clodronate In Equine Hair Using Liquid Chromatography-Tandem Mass Spectrometry, Heather K. Knych, D. S. Mckemie, S. Yim, S. D. Stanley, R. M. Arthur Jul 2023

Long-Term Monitoring Of Clodronate In Equine Hair Using Liquid Chromatography-Tandem Mass Spectrometry, Heather K. Knych, D. S. Mckemie, S. Yim, S. D. Stanley, R. M. Arthur

UK CARES Faculty Publications

Given the potential for long-term inhibition of bone remodeling/healing and detrimental effects to horses in training, bisphosphonates are tightly regulated in horseracing. Hair has proven to be an effective matrix for detection of drug administration to horses and has been particularly effective in detecting drugs for a long period of time post administration. Thus, hair may prove to be a useful matrix for detection of administration of this class of drugs. The objective of the current study was to develop an assay and assess the usefulness of hair as a matrix for long-term detection of clodronate to horses. Seven horses …


The Sound Of Geological Targets On Mars From The Absolute Intensity Of Laser-Induced Sparks Shock Waves, C. Alvarez-Llamas, J. Laserna, J. Moros, P. Purohit, L. García-Gómez, S. M. Angel Ph.D., P. Bernardi, B. Bousquet, A. Cadu, E. Dauson, O. Forni, T. Fouchet, O. Gasnault, X. Jacob, G. Lacombe, N. L. Lanza, C. Larmat, J. Lasue, R. D. Lorenz, P. Y. Meslin, D. Mimoun, F. Montmessin, N. Murdoch, A. M. Ollila, P. Pilleri, N. Randazzo, A. L. Reyes-Newell, S. Schröder, A. Stott, J. Ten Cate, A. Udry, D. Vogt Jul 2023

The Sound Of Geological Targets On Mars From The Absolute Intensity Of Laser-Induced Sparks Shock Waves, C. Alvarez-Llamas, J. Laserna, J. Moros, P. Purohit, L. García-Gómez, S. M. Angel Ph.D., P. Bernardi, B. Bousquet, A. Cadu, E. Dauson, O. Forni, T. Fouchet, O. Gasnault, X. Jacob, G. Lacombe, N. L. Lanza, C. Larmat, J. Lasue, R. D. Lorenz, P. Y. Meslin, D. Mimoun, F. Montmessin, N. Murdoch, A. M. Ollila, P. Pilleri, N. Randazzo, A. L. Reyes-Newell, S. Schröder, A. Stott, J. Ten Cate, A. Udry, D. Vogt

Faculty Publications

Inspection of geological material is one of the main goals of the Perseverance rover during its journey across the landscape of the Jezero crater in Mars. NASA's rover integrates SuperCam, an instrument capable of performing standoff characterization of samples using a variety of techniques. Among those tools, SuperCam can perform laser-induced breakdown spectroscopy (LIBS) studies to elucidate the chemical composition of the targets of interest. Data from optical spectroscopy can be supplemented by simultaneously-produced laser-produced plasma acoustics in order to expand the information acquired from the probed rocks thanks to the SuperCam's microphone (MIC) as it can be synchronized with …


Analysis Of The Paraventricular Nucleus Of The Hypothalamus After Exposure To Decabromodiphenyl Ether In Mice, Tia Blossomgame, Hermei Herman, Sharlenn La, Jocelyn Saquisili, Annabella Vargas, Grace Martinichio, Vincent P. Markowski Jul 2023

Analysis Of The Paraventricular Nucleus Of The Hypothalamus After Exposure To Decabromodiphenyl Ether In Mice, Tia Blossomgame, Hermei Herman, Sharlenn La, Jocelyn Saquisili, Annabella Vargas, Grace Martinichio, Vincent P. Markowski

McNair Scholars Program

No abstract provided.


Sympatric Soil Microbe Interactions Between Streptomyces And Fusarium Isolates, Lehren A. Olk-Szost Jul 2023

Sympatric Soil Microbe Interactions Between Streptomyces And Fusarium Isolates, Lehren A. Olk-Szost

All NMU Master's Theses

Interkingdom interactions between soil bacteria and fungi may play a critical role in occurrence of disease suppressive soils, yet our understanding of these interactions remains limited. Streptomyces are well-known producers of antimicrobial compounds important to medicine and agriculture. Production of these secondary metabolites is often mediated by quorum sensing. Most Streptomyces research occurs in single species experiments, yet new metabolites have been discovered in interspecies co-culture experiments. Interspecies, intergenic, and interkingdom co-culture research will likely reveal many valuable compounds, and strengthen our understanding of complex ecological interactions in soil microbiomes. Interactions between sympatric Streptomyces and Fusarium isolates from disease suppressive …


The Role Of Tc-Ptp-Mediated Suppression Of Autophagy During Skin Carcinogenesis, Obed Asare Jul 2023

The Role Of Tc-Ptp-Mediated Suppression Of Autophagy During Skin Carcinogenesis, Obed Asare

Theses and Dissertations

Ultraviolet B (UVB) radiation can distort cellular homeostasis and predispose the skin to carcinogenesis. Amongst the deteriorating effects of the sun’s UVB radiation on cellular homeostasis is the formation of DNA photoproducts such as cyclobutene pyrimidine dimers. These photoproducts can cause significant changes in the structure and conformation of the DNA, inducing gene mutations which may accumulate to trigger the formation of skin cancer. Photoproducts are typically repaired by nucleotide excision repair. Notwithstanding, when the repair mechanism fails, apoptosis ensues to prevent the accumulation of mutations and to restore cellular homeostasis. We have identified T-cell protein tyrosine phosphatase (TC-PTP) as …


Enhanced Bypass Of Pd-L1 Translation Reduces The Therapeutic Response To Mtor Kinase Inhibitors, Yanan Cao, Qing Ye, Murong Ma, Qing-Bai She Jul 2023

Enhanced Bypass Of Pd-L1 Translation Reduces The Therapeutic Response To Mtor Kinase Inhibitors, Yanan Cao, Qing Ye, Murong Ma, Qing-Bai She

Markey Cancer Center Faculty Publications

Increased PD-L1 expression in cancer cells is known to enhance immunosuppression, but the mechanism underlying PD-L1 upregulation is incompletely characterized. We show that PD-L1 expression is upregulated through internal ribosomal entry site (IRES)-mediated translation upon mTORC1 inhibition. We identify an IRES element in the PD-L1 50-UTR that permits cap-independent translation and promotes continuous production of PD-L1 protein despite effective inhibition of mTORC1. eIF4A is found to be a key PD-L1 IRES-binding protein that enhances PD-L1 IRES activity and protein production in tumor cells treated with mTOR kinase inhibitors (mTORkis). Notably, treatment with mTORkis in vivo elevates PD-L1 levels and reduces …


Messes: Software For Transforming Messy Research Datasets Into Clean Submissions To Metabolomics Workbench For Public Sharing, P. Travis Thompson, Hunter N. B. Moseley Jul 2023

Messes: Software For Transforming Messy Research Datasets Into Clean Submissions To Metabolomics Workbench For Public Sharing, P. Travis Thompson, Hunter N. B. Moseley

Markey Cancer Center Faculty Publications

In recent years, the FAIR guiding principles and the broader concept of open science has grown in importance in academic research, especially as funding entities have aggressively promoted public sharing of research products. Key to public research sharing is deposition of datasets into online data repositories, but it can be a chore to transform messy unstructured data into the forms required by these repositories. To help generate Metabolomics Workbench depositions, we have developed the MESSES (Metadata from Experimental SpreadSheets Extraction System) software package, implemented in the Python 3 programming language and supported on Linux, Windows, and Mac operating systems. MESSES …


The Metabolomics Workbench File Status Website: A Metadata Repository Promoting Fair Principles Of Metabolomics Data, Christian D. Powell, Hunter N. B. Moseley Jul 2023

The Metabolomics Workbench File Status Website: A Metadata Repository Promoting Fair Principles Of Metabolomics Data, Christian D. Powell, Hunter N. B. Moseley

Markey Cancer Center Faculty Publications

Background: An updated version of the mwtab Python package for programmatic access to the Metabolomics Workbench (MetabolomicsWB) data repository was released at the beginning of 2021. Along with updating the package to match the changes to MetabolomicsWB’s ‘mwTab’ file format specification and enhancing the package’s functionality, the included validation facilities were used to detect and catalog file inconsistencies and errors across all publicly available datasets in MetabolomicsWB.

Results: The MetabolomicsWB File Status website was developed to provide continuous validation of MetabolomicsWB data files and a useful interface to all found inconsistencies and errors. This list of detectable issues/errors include format …