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Articles 691 - 720 of 751
Full-Text Articles in Medicine and Health Sciences
Exosomal Curcumin: Its Bioavailability And Potential Anti-Inflammation Activity, Dongmei Sun
Exosomal Curcumin: Its Bioavailability And Potential Anti-Inflammation Activity, Dongmei Sun
All ETDs from UAB
Curcumin, a pleiotropic polyphenol derived from turmeric plants Curcuma Longa with rhizome, exhibits strong evidence as an anti-inflammation, anti-oxidant and anti-cancer reagent both in vitro and in vivo. Due to its low stability and systemic bioavailability, a large amount of curcumin has to be administrated to achieve therapeutic effects both in animal and in human. The major effort to overcome this barrier is making by encapsulation of curcumin into nanoparticles such as polymers and liposomes; some promising data have demonstrated the effectiveness of such method. Exosomes are vesicle-like nanoparticles secreted by living cells. Exosomes contain both cell surface molecules and …
Dna Replication And Cytokinesis In Drosophila Melanogaster, Anton Svitin
Dna Replication And Cytokinesis In Drosophila Melanogaster, Anton Svitin
All ETDs from UAB
DNA replication and cytokinesis are two important parts of the cell division process. Our studies address different aspects of both of these processes and potential links between them. One of the best approaches for studying DNA replication in eukaryotes has been an analysis in cell free in vitro systems. The existing cell free replication systems for Drosophila are relatively ineffective. In the first part of this work, we have developed an optimized in vitro system to study DNA replication using early egg extracts of Drosophila. Our studies indicate that this system proves to be an extremely useful tool for a …
Structural And Functional Study Of P58(Ipk), Jiahui Tao
Structural And Functional Study Of P58(Ipk), Jiahui Tao
All ETDs from UAB
P58(IPK) is an endoplasmic reticulum (ER)-resident protein which is upregulated during unfolded protein response (UPR). In stressed cells, P58(IPK) functions to restore protein folding equilibrium in ER by suppressing protein aggregation and promoting protein folding. P58(IPK) associates with the unfolded protein via its N-terminal TPR domain and presents it to BiP (binding immunoglobulin protein) for subsequent folding. P58(IPK) belongs to the Hsp40 family. Collectively, P58(IPK) is a stress-inducible ER-resident molecular chaperone. In this dissertation, we report the crystal structure of P58(IPK) TPR domain to 2.5 Å resolution. In the crystal structure, the 43-kDa TPR domain consists of nine tandemly linked …
Roles Of Adiponectin And Its Receptors In Foam Cell Transformation, Ling Tian
Roles Of Adiponectin And Its Receptors In Foam Cell Transformation, Ling Tian
All ETDs from UAB
Macrophages play a critical role in the initiation and progression of atherosclerosis by producing pro-inflammatory mediators and transforming into lipid-laden foam cells. The prevention of lipid accumulation and inflammation in macrophage foam cells, therefore, represents a promising target for effective therapy for atherosclerosis. Adiponectin is a circulating cytokine primarily expressed and secreted by adipocytes, and is downregulated in obesity-linked diseases including type 2 diabetes, coronary artery disease and hypertension. In oxidized low-density lipoprotein (oxLDL)-induced human THP-1 macrophage foam cells, adiponectin suppresses lipid accumulation through decreasing lipid uptake and increasing high-density lipoprotein (HDL)-mediated lipid efflux. The potential mechanisms that adiponectin utilizes …
Cgmp Pde As A Novel Molecular Target For The Prevention And Treatment Of Breast Cancer, Heather Nicole Tinsley
Cgmp Pde As A Novel Molecular Target For The Prevention And Treatment Of Breast Cancer, Heather Nicole Tinsley
All ETDs from UAB
Breast cancer remains a major health concern, despite efforts to develop improved therapeutics. Chemoprevention is a promising strategy for reducing breast cancer-related morbidity and mortality. However, with the exception of the selective estrogen receptor modulators (SERMs), which have limited efficacy and severe toxicities, no drugs have been approved for breast cancer chemoprevention. Studies demonstrate that certain nonsteroidal anti-inflammatory drugs (NSAIDs) display promising chemopreventive efficacy. Unfortunately, the depletion of physiologically important prostaglandins due to inhibition of the cyclooxygenase (COX) enzymes results in potentially fatal toxicities, which exclude the use of NSAIDs and COX-2 selective inhibitors for chemoprevention. Ample data, however, suggest …
Red Blood Cell And Hemoglobin Dependent Modulation Of Reactive Species Metabolism: Implications For Vascular Homeostasis, Dario A. Vitturi
Red Blood Cell And Hemoglobin Dependent Modulation Of Reactive Species Metabolism: Implications For Vascular Homeostasis, Dario A. Vitturi
All ETDs from UAB
The recent discovery that red blood cells might mediate hypoxic blood flow together with accumulating evidence that suggests a role for the modulation of vascular inflammation has reshaped the way we think about the function of these cells. In this thesis we investigate the mechanisms that regulate these newly appreciated functions and focus on i) the ability of red cells to couple oxygen sensing with nitrite reduction and nitric oxide formation and ii) the role of the beta93cys, a conserved residue amongst mammalian hemoglobins and whose function remains unclear. Data will be presented that demonstrate that nitrite reduction to nitric …
Usp14: A Link Between The Proteasome And Synaptic Function, Brandon John Walters
Usp14: A Link Between The Proteasome And Synaptic Function, Brandon John Walters
All ETDs from UAB
The ubiquitin proteasome system (UPS) is a coordinated process by which the cell can control protein distribution and abundance. Proteins are marked for turnover by the construction of a polyubiquitin chain on the protein substrate. Once engaged by the proteasome, the ubiquitin side-chain is disassembled by proteasomal deubiquitinating enzymes (DUBs), preventing entry of ubiquitin into the proteasome and recycling it for use in future reactions. One of the DUBs that resides on the proteasome is Ubiquitin Specific Protease 14 (Usp14), which is mutated in the ataxia (axJ) mice. This mutation results in pronounced physical deficits and, unexpectedly, a deficit in …
A Dual Protease Inhibitor/Receptor Antagonist With Therapeutic Implications For Chronic Inflammatory Lung Diseases, Matthew Thomas Hardison
A Dual Protease Inhibitor/Receptor Antagonist With Therapeutic Implications For Chronic Inflammatory Lung Diseases, Matthew Thomas Hardison
All ETDs from UAB
Chronic neutrophilic inflammation is a hallmark of numerous pulmonary diseases. It is commonly associated with declining lung function, collagen turnover, and increased protease activity. Our laboratory has recently published several articles describing a biologically active collagen breakdown product, proline-glycine-proline (PGP) and its more active amino-terminus acetylated form, N-α-PGP. PGP acts via classical chemokine receptors CXCR1 and 2 to draw neutrophils (PMNs) into sites of inflammation in what is potentially a feed-forward mechanism of disease. The tri-peptide appears to be a bio-marker in certain clinical diseases like cystic fibrosis (CF) and chronic obstructive pulmonary disease (COPD). The present work first details …
Functional Determinants Of The Porin Mspa And Its Role In Permeabilizing Mycobacterial Outer Membranes, Jason Huff
Functional Determinants Of The Porin Mspa And Its Role In Permeabilizing Mycobacterial Outer Membranes, Jason Huff
All ETDs from UAB
Mycobacterium tuberculosis (Mtb) infects one third of the global population and causes approximately 2,000,000 Tuberculosis-related deaths annually. Mycobacteria are Gram positive organisms but contain a unique outer membrane (OM) which is functionally similar but structurally different from those of Gram negative bacteria. The mycobacterial OM presents an efficient permeability barrier towards hydrophilic solutes. Slow permeation kinetics of hydrophilic molecules through membranes and several discoveries of cell wall channel-forming proteins indicate that mycobacterial OMs are functionalized by proteins. MspA is the primary porin of M. smegmatis and mediates diffusion of small, hydrophilic nutrients and antibiotics across the OM. Unlike porins of …
Role Of The Human Cytomegalovirus Tegument Protein Pp150 In The Trafficking And Assembly Of Infectious Virions, Sabarish Vellatheri Indran
Role Of The Human Cytomegalovirus Tegument Protein Pp150 In The Trafficking And Assembly Of Infectious Virions, Sabarish Vellatheri Indran
All ETDs from UAB
Human cytomegalovirus, a ubiquitous human pathogen, establishes a persistent infection in the infected host. HCMV assembly takes place in the nucleus and cytoplasm of infected cells by a complex and incompletely defined process. The viral DNA is enclosed by the capsid, which is surrounded by a proteinaceous tegument, which is covered by a cell-derived envelope studded with viral glycoproteins. The assembly pathway and protein interactions required for formation of the tegument layer and the function of most of the proteins in the tegument remain poorly understood. In this study, we investigated the functions of an essential abundant tegument protein, pp150, …
Molecular Mechanisms Of Hepatic Insulin Resistance Following Injury, Shaoning Jiang
Molecular Mechanisms Of Hepatic Insulin Resistance Following Injury, Shaoning Jiang
All ETDs from UAB
Insulin resistance commonly occurs following injuries or critical illness independent of previous diabetic status. The development of insulin resistance and hyperglycemia is associated with increased mortality and morbidity in critically ill patients. However, the molecular mechanisms underlying the acute insulin resistance following injuries remain poorly understood. With an animal model of trauma and hemorrhage, we have previously demonstrated the rapid development of insulin resistance in liver, and a critical role of TNFα in hemorrhage-induced defects in insulin signaling following resuscitation. However, hepat-ic insulin signaling is impaired prior to a significant increase in plasma TNFα, suggesting the initial development of hemorrhage-induced …
In Vitro Elucidation Of The Role And Mechanism Of Rankl In Tnf-And Il-1-Mediated Osteoclast Formation And Function, Joel Jules
All ETDs from UAB
The receptor activator of NF-қB (RANK) ligand (RANKL) and its receptor RANK play a critical role in osteoclast biology. RANK has three tumor necrosis factor receptor associated factor (TRAF)-binding motifs [PFQEP369-373 (Motif 1), PVQEET559-564 (Motif 2), and PVQEQG604-609 (Motif 3)] that regulate osteoclast formation and function. RANK also contains a TRAF-independent motif (IVVY535-538) that commits bone marrow macrophages (BMMs), which are osteoclast precursors, to the osteoclast lineage for osteoclastogenesis. Notably, tumor necrosis factor-α (TNF) and interlukin-1 (IL-1) utilize TRAFs to initiate most of the signaling pathways known to be activated by RANKL but fail to form osteoclasts unless attended by …
Identification And Characterization Of Downstream Target Genes Of The Bmp Signaling Pathway, Nam Chul Kim
Identification And Characterization Of Downstream Target Genes Of The Bmp Signaling Pathway, Nam Chul Kim
All ETDs from UAB
During nervous system development, neurons proliferate, differentiate, project their axons to their targets and make synapses with them. At the neuromuscular junction of Drosophila, these functional synapses enlarge as the body grows to maintain physiologically effective synaptic transmission with the muscles. Drosophila Bone Morphogenetic Protein (BMP) type II receptor, Wishful thinking (Wit), is important in this proper synaptic growth and function. To identify transcriptional targets of Wit signaling, we performed microarray experiments comparing normal controls to wit mutants. Through this study, we found that some of the verified target genes showed isoform-specific regulation in wit mutants, and that several neuropeptide …
The Role Of The Intracellular Signaling Pathway In Ehrlichia Canis Infection In Vitro, Chang-Hyun Kim
The Role Of The Intracellular Signaling Pathway In Ehrlichia Canis Infection In Vitro, Chang-Hyun Kim
All ETDs from UAB
Ehrlichia canis is a pleomorphic obligatory intracellular gram-negative bacterium that causes tick-borne canine ehrlichiosis. A systematic investigation on the pathogenesis of the disease has been hindered largely by lack of a reliable quantitative assay. Using quantitative real time PCR (qPCR), a quantitative assay for E. canis was developed and validated. Using the qPCR, the intracellular proliferation kinetics of E. canis in the canine 030F cell-line was studied for the first time. Many intracellular bacterial pathogens have been shown to use Ca2+ signaling in the host cells to induce their own internalization and proliferation. However, it is not clear how Ca2+ …
Transcriptional Regulation Of The Human Heme Oxygenase-1 Via Chromatin Looping In Renal Cells, Junghyun Kim
Transcriptional Regulation Of The Human Heme Oxygenase-1 Via Chromatin Looping In Renal Cells, Junghyun Kim
All ETDs from UAB
Heme oxygenase-1 (HO-1) is a critical enzyme catalyzing the degradation of heme and generating carbon monoxide, iron, and biliverdin. In addition to heme degradation, HO-1 expression is known to protect against various cellular insults and disease states including acute kidney injury, atherosclerosis, vascular restenosis, and others. Human HO-1 gene expression is tightly regulated at the level of transcription. The main goal of this study is to explore the transcriptional regulation of the human HO-1 gene in renal epithelial cells. Chromosome Conformation Capture (3C) demonstrates that multiple regulatory regions within the HO-1 promoter and enhancer regions are physically interacting with each …
The Role Of Gli1 In Eralpha-Negative Breast Cancer: Promoting Survival, Migration, Invasion, And Metastasis, Yeon-Jin Kwon
The Role Of Gli1 In Eralpha-Negative Breast Cancer: Promoting Survival, Migration, Invasion, And Metastasis, Yeon-Jin Kwon
All ETDs from UAB
Glioma-associated oncogene homolog 1 (Gli1) is a well-known oncogene and a transcription factor that mediates several signaling pathways important for tumor progression, such as hedgehog, TGFß, Ras, and EGFR. Although Gli1 is known to play an important role in cancers of brain, skin, prostate, and the pancreas, the role of Gli1 in breast cancer was not previously well-defined. Therefore, this dissertation focuses on defining the role of Gli1 and the mechanism underlying Gli1-mediated transcription in breast cancer. Interestingly, the major findings of the dissertation clearly indicate that Gli1 promotes cell survival and is predictive of a poor outcome in Estrogen …
Effect Of Overexpressing Apolipoprotein A-I In An Animal Model Of Alzheimer's Disease, Terry L. Lewis
Effect Of Overexpressing Apolipoprotein A-I In An Animal Model Of Alzheimer's Disease, Terry L. Lewis
All ETDs from UAB
Apolipoprotein A-I (apoA-I) is the major protein component of high density lipoprotein (HDL) in circulation and is expressed mainly by the liver and intestine. The levels of apoA-I/HDL are inversely related to the incidence of cardiovascular disease. Because of the connections between heart disease and Alzheimer's disease (AD), it is conceivable that high levels of apoA-I/HDL may be protective against AD. However, the limited literature shows mixed results on the role of apoA-I/HDL in the development of AD. It is hypothesized that increased expression of human apoA-I will ameliorate the behavioral deficits and characteristic amyloid-ß (Aß) plaque formation in a …
Role Of 14-3-3&Tau In Autophagy And Role Of Edd In P53 Regulation, Shiyun Ling
Role Of 14-3-3&Tau In Autophagy And Role Of Edd In P53 Regulation, Shiyun Ling
All ETDs from UAB
Unrestricted cell proliferation and suppression of cell death are two essential events for tumor development. My dissertation research involves two proteins, 14-3-3 &tau and EDD which are involved in diverse pathways related to these two fields in recent studies. Previous study demonstrates that 14-3-3ô regulates p21 degradation. Up-regulation of 14-3-3ô is seen in breast cancer and is correlated with the down-regulation of p21 in breast cancer. Amplification or overexpression of EDD was observed in breast cancer and ovarian cancers. Illustrating the new roles of these two proteins in proliferation and cell death will advance our knowledge in tumorigenesis and help …
Developing A Screen To Identify Small Molecule Inhibitors That Disrupt Protein-Protein Interactions In Mycobacteria, Deborah Mai
Developing A Screen To Identify Small Molecule Inhibitors That Disrupt Protein-Protein Interactions In Mycobacteria, Deborah Mai
All ETDs from UAB
Mycobacterium tuberculosis (Mtb) is the causative agent of tuberculosis (TB) and infects nearly one-third of the world's population. The same TB chemotherapeutic regimen has been administered for more than 50 years, and can be improved by developing innovative methods to discover new anti-TB drugs. This work describes a newly established high-throughput screen (HTS) platform technology based on Mycobacterial-Protein Fragment Complementation (M-PFC) to identify small molecule inhibitors of protein-protein interactions in mycobacteria. M-PFC HTS employs both whole cell and target-based approaches, and offers flexibility in selecting an appropriate protein interaction target for HTS. Selectable drug targets can include interactions of essential …
The Structural And Functional Studies Of Yeast Nucleotide Exchange Factor Sil1p And Its Complex With Bip, Ming Yan
All ETDs from UAB
Sil1 is an Endoplasmic Reticulum (ER) localized protein. SIL1 was initially identified as a UPR-regulated gene. Later studies show Sil1 functions as the nucleotide exchange factor of ER lumenal Hsp70--Bip by directly interacting with the ATPase domain of Bip. Currently, the molecular mechanism how Sil1 catalyzes nucleotide exchange of Bip is still elusive. In this study we determine the complex structure of yeast S.cerevisia Sil1 and Bip (also called Kar2) ATPase domain at 2.3Ã resolution by Single-anomalous dispersion (SAD) methods. The Sil1-Bip complex structure reveals that one sil1 molecule interacts with one Bip ATPase domain molecule to form the complex. …
A Ck2-Dependent Mechanism For Activation Of The Jak-Stat Signaling Pathway: Implications For Cancer Biology, Ying Zheng
A Ck2-Dependent Mechanism For Activation Of The Jak-Stat Signaling Pathway: Implications For Cancer Biology, Ying Zheng
All ETDs from UAB
Janus Kinase (JAK)-Signal Transducer and Activator of Transcription (STAT) signaling is involved in regulation of cell survival, proliferation and differentiation. JAK tyrosine kinases can be transiently activated by cytokines or growth factors in normal cells, while they become constitutively activated as a result of mutations that affect their function in tumors. Specifically, the JAK2V617F mutation is present in the majority of patients with myeloproliferative disorders (MPDs) and is implicated in the pathogenesis of these diseases. In this dissertation, we report the identification of the serine/threonine kinase CK2 as a novel interactor and important regulator of activation of the JAK-STAT signaling …
The Role Of Synaptically Evoked Plateau Potentials In Retinogeniculate Development, Emily Dilger
The Role Of Synaptically Evoked Plateau Potentials In Retinogeniculate Development, Emily Dilger
Theses and Dissertations
We study the activity-dependent refinement of sensory systems by using the mouse retinogeniculate system as a model. Spontaneous retinal waves lead to robust excitatory post-synaptic activity in developing relay cells in the dorsal lateral geniculate nucleus (dLGN) of the thalamus and are reportedly needed to help guide the segregation of retinal inputs into eye-specific domains as well as for the pruning of extraneous retinal inputs onto single dLGN relay cells. The composition of retinally evoked post-synaptic activity activated by these retinal waves in dLGN is largely unknown, but based on our in vitro recordings, such activity seems well suited to …
Autotaxin: A Regulator Of Oligodendrocyte Differentiation, Larra Yuelling
Autotaxin: A Regulator Of Oligodendrocyte Differentiation, Larra Yuelling
Theses and Dissertations
In order for oligodendrocyte progenitor cells (OPCs) to differentiate into fully mature, myelinating oligodendrocytes, they must be specified at the correct times and undergo coordinated changes in both gene expression and morphology. As oligodendrocytes differentiate, they transition from a bipolar morphology into a morphology characterized by a complex network of multiple processes, which will eventually generate membranous structures necessary for myelination of axonal segments. As changes are observed in cellular morphology, oligodendrocytes also undergo changes in their gene expression profile and express genes necessary for both early and later stages of development such as olig1 and myelin basic protein (mbp), …
Generation And Analysis Of The Oncolytic Efficacy Of A Conditionally Replicating Adenovirus Bearing Rgd Modifications On Pix And Fiber Capsid Proteins, Lena Jeanelle Gamble
Generation And Analysis Of The Oncolytic Efficacy Of A Conditionally Replicating Adenovirus Bearing Rgd Modifications On Pix And Fiber Capsid Proteins, Lena Jeanelle Gamble
All ETDs from UAB
Ovarian cancer is the leading cause of gynecological disease death in women. For the past two decades, scientists have attempted to perfect the use of adenovirus as an anti-cancer therapeutic agent. One major impediment to ovarian tumor infection with adenovirus has been dearth of adenovirus native receptor, Coxsackie and Adenovirus receptor, (CAR), on the surface of tumor cells. To address this problem, scientists have engineered CAR-independent adenoviruses which target the AlphavBeta3 and AlphavBeta5 by adding an arginine-glycine-aspartate (RGD) motif to the fiber knob of a conditionally replicating adenovirus (CRAd) Delta24FiberRGD CRAd. We hypothesize that incorporation of RGD into the pIX …
A Model For Understanding Epilepsy In Peromyscus, Kevin Ryan, Gabor Szalai
A Model For Understanding Epilepsy In Peromyscus, Kevin Ryan, Gabor Szalai
Journal of the South Carolina Academy of Science
No abstract provided.
The Overexpression Of Homeotic Complex Gene Ultrabithorax In The Post-Embryonic Neuronal Lineages Of The Ventral Nervous System In Drosophila Melanogaster, Katie Dry
Master’s Theses
This study uses a molecular technique called MARCM (Mosaic Analysis with a Repressible Cell Marker) to label neuronal lineages that overexpress the Hox gene Ultrabithorax (Ubx) in an unlabeled, wild type background. The results indicate that the overexpression of Ubx is sufficient to transform more anterior neuronal lineages to themorphology of their more posterior counterparts. The data presented here begin to elucidate the role that the Hox genes have in shaping segment-specific neural connections in the post-embryonic ventral nervous system.
Pk/Pd Modelling Of Comb-Shaped Pegylated Salmon Calcitonin Conjugates Of Differing Molecular Weights, Sinead Ryan, Jesus Maria Frias, David H. Haddleton, David J. Brayden
Pk/Pd Modelling Of Comb-Shaped Pegylated Salmon Calcitonin Conjugates Of Differing Molecular Weights, Sinead Ryan, Jesus Maria Frias, David H. Haddleton, David J. Brayden
Articles
Salmon calcitonin (sCT) was conjugated via cysteine-1 to novel combed-shaped end-functionalised poly(PEG) methyl ether methacrylate) (sCT-P) comb-shaped polymers, to yield conjugates of total molecular weights (MW) inclusive of sCT: 6.5, 9.5, 23 and 40 kDa. The conjugates were characterised by HPLC and their in vitro and in vivo bioactivity was measured by cAMP assay on human T47D cells and following intravenous (i.v.) injection to rats, respectively. Stability against endopeptidases, rat serum and liver homogenates was assessed. There were linear and exponential relationships between conjugate MW with potency and efficacy respectively, however the largest MW conjugate still retained 70% of E …
Cardiopulmonary Resuscitation Prescription Program: A Prospective Randomized Pilot Study, Marna R. Greenberg Do, Mph, Facep, Gavin Barr Md, Valerie Rupp Rn, Bsn, Nainesh C. Patel Md, Kevin R. Weaver Do, Kimberly Hamilton Ba, James F. Reed Iii Phd
Cardiopulmonary Resuscitation Prescription Program: A Prospective Randomized Pilot Study, Marna R. Greenberg Do, Mph, Facep, Gavin Barr Md, Valerie Rupp Rn, Bsn, Nainesh C. Patel Md, Kevin R. Weaver Do, Kimberly Hamilton Ba, James F. Reed Iii Phd
Department of Emergency Medicine
No abstract provided.
Hpv Dna Partitioning During Mitosis As Followed By Fluorescence Microscopy, Robert J. Carter
Hpv Dna Partitioning During Mitosis As Followed By Fluorescence Microscopy, Robert J. Carter
All ETDs from UAB
Human papillomaviruses (HPVs) are small, double-stranded deoxyribonucleic acid (DNA) tumor viruses capable of establishing persistent infections in the epithelia. After infecting actively-dividing basal cells, the papillomavirus (PV) genome is main-tained as extrachromosomal nuclear plasmids. It is largely unknown how the viral ge-nome is maintained in actively-dividing cells. Our lab demonstrated that several HPV genotypes appear to employ a distinct strategy to facilitate partitioning of HPV DNA into daughter cells during mitosis. Association of the HPV-11 origin of replication (ori)-binding protein E2 with the mitotic apparatus via cellular adapter proteins is thought to mediate equal partitioning of HPV genomes into daughter …
Pneumococcal Vaccine Response And Aging In Human, Saeyoung Park
Pneumococcal Vaccine Response And Aging In Human, Saeyoung Park
All ETDs from UAB
Streptococcus pneumoniae is a major human pathogen, especially for young children and older adults. To protect from pneumococcal diseases, 23-valent pneumococcal polysaccharide vaccine (PPV23) has been used clinically since 1983. However, PPV23 is not so effective among old adults with its protective efficacy diminishing with age. We confirmed that young and old adults, who were immunized with PPV23, have comparable pneumococcal polysaccharide (PS) specific IgG levels. Interestingly, we found that old adults had lower IgA and IgM antibody levels than young adults for three serotypes (serotype 14, 18C and 23F). Consistent with the previous results, opsonic capacities of immune sera …