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Articles 1 - 19 of 19
Full-Text Articles in Medicine and Health Sciences
Wnt Signaling Exerts An Antiproliferative Effect On Adult Cardiac Progenitor Cells Through Igfbp3., Angelos Oikonomopoulos, Konstantina-Ioanna Sereti, Frank Conyers, Michael Bauer, Annette Liao, Jian Guan, Dylan Crapps, Jung-Kyu Han, Hanhua Dong, Ahmad F Bayomy, Gabriel C Fine, Karen Westerman, Travis L Biechele, Randall T Moon, Thomas Force, Ronglih Liao
Wnt Signaling Exerts An Antiproliferative Effect On Adult Cardiac Progenitor Cells Through Igfbp3., Angelos Oikonomopoulos, Konstantina-Ioanna Sereti, Frank Conyers, Michael Bauer, Annette Liao, Jian Guan, Dylan Crapps, Jung-Kyu Han, Hanhua Dong, Ahmad F Bayomy, Gabriel C Fine, Karen Westerman, Travis L Biechele, Randall T Moon, Thomas Force, Ronglih Liao
Center for Translational Medicine Faculty Papers
RATIONALE: Recent work in animal models and humans has demonstrated the presence of organ-specific progenitor cells required for the regenerative capacity of the adult heart. In response to tissue injury, progenitor cells differentiate into specialized cells, while their numbers are maintained through mechanisms of self-renewal. The molecular cues that dictate the self-renewal of adult progenitor cells in the heart, however, remain unclear.
OBJECTIVE: We investigate the role of canonical Wnt signaling on adult cardiac side population (CSP) cells under physiological and disease conditions.
METHODS AND RESULTS: CSP cells isolated from C57BL/6J mice were used to study the effects of canonical …
Paradoxical Reversal Learning Enhancement By Stress Or Prefrontal Cortical Damage: Rescue With Bdnf., Carolyn Graybeal, Michael Feyder, Emily Schulman, Lisa M Saksida, Timothy J Bussey, Jonathan L Brigman, Andrew Holmes
Paradoxical Reversal Learning Enhancement By Stress Or Prefrontal Cortical Damage: Rescue With Bdnf., Carolyn Graybeal, Michael Feyder, Emily Schulman, Lisa M Saksida, Timothy J Bussey, Jonathan L Brigman, Andrew Holmes
Brain and Mind Institute Researchers' Publications
Stress affects various forms of cognition. We found that moderate stress enhanced late reversal learning in a mouse touchscreen-based choice task. Ventromedial prefrontal cortex (vmPFC) lesions mimicked the effect of stress, whereas orbitofrontal and dorsolateral striatal lesions impaired reversal. Stress facilitation of reversal was prevented by BDNF infusion into the vmPFC. These findings suggest a mechanism by which stress-induced vmPFC dysfunction disinhibits learning by alternate (for example, striatal) systems.
Innate And Adaptive Immunity To The Nematode Strongyloides Stercoralis In A Mouse Model., Sandra Bonne-Annee, Jessica A. Hess, David Abraham
Innate And Adaptive Immunity To The Nematode Strongyloides Stercoralis In A Mouse Model., Sandra Bonne-Annee, Jessica A. Hess, David Abraham
Department of Microbiology and Immunology Faculty Papers
Mice have been used to the study the mechanisms of protective innate and adaptive immunity to larval Strongyloides stercoralis. During primary infection, neutrophils and eosinophils are attracted by parasite components and kill the larvae by release of granule products. Eosinophils also function as antigen-presenting cells for the induction of a Th2 response. B cells produce both IgM and IgG that collaborate with neutrophils to kill worms in the adaptive immune response. Vaccine studies have identified a recombinant diagnostic antigen that induced high levels of immunity to infection with S. stercoralis in mice. These studies demonstrate that there are redundancies in …
Abca12-Mediated Lipid Transport And Snap29-Dependent Trafficking Of Lamellar Granules Are Crucial For Epidermal Morphogenesis In A Zebrafish Model Of Ichthyosis., Qiaoli Li, Michael Frank, Masashi Akiyama, Shiu-Ying Ho, Hiroshi Shimizu, Christine Thisse, Bernard Thisse, Eli Sprecher, Jouni Uitto
Abca12-Mediated Lipid Transport And Snap29-Dependent Trafficking Of Lamellar Granules Are Crucial For Epidermal Morphogenesis In A Zebrafish Model Of Ichthyosis., Qiaoli Li, Michael Frank, Masashi Akiyama, Shiu-Ying Ho, Hiroshi Shimizu, Christine Thisse, Bernard Thisse, Eli Sprecher, Jouni Uitto
Department of Dermatology and Cutaneous Biology Faculty Papers
Zebrafish (Danio rerio) can serve as a model system to study heritable skin diseases. The skin is rapidly developed during the first 5-6 days of embryonic growth, accompanied by expression of skin-specific genes. Transmission electron microscopy (TEM) of wild-type zebrafish at day 5 reveals a two-cell-layer epidermis separated from the underlying collagenous stroma by a basement membrane with fully developed hemidesmosomes. Scanning electron microscopy (SEM) reveals an ordered surface contour of keratinocytes with discrete microridges. To gain insight into epidermal morphogenesis, we have employed morpholino-mediated knockdown of the abca12 and snap29 genes, which are crucial for secretion of lipids and …
Human Glial-Restricted Progenitor Transplantation Into Cervical Spinal Cord Of The Sod1 Mouse Model Of Als., Angelo C Lepore, John O'Donnell, Andrew S Kim, Timothy Williams, Alicia Tuteja, Mahendra S Rao, Linda L Kelley, James T Campanelli, Nicholas J Maragakis
Human Glial-Restricted Progenitor Transplantation Into Cervical Spinal Cord Of The Sod1 Mouse Model Of Als., Angelo C Lepore, John O'Donnell, Andrew S Kim, Timothy Williams, Alicia Tuteja, Mahendra S Rao, Linda L Kelley, James T Campanelli, Nicholas J Maragakis
Department of Neuroscience Faculty Papers
Cellular abnormalities are not limited to motor neurons in amyotrophic lateral sclerosis (ALS). There are numerous observations of astrocyte dysfunction in both humans with ALS and in SOD1(G93A) rodents, a widely studied ALS model. The present study therapeutically targeted astrocyte replacement in this model via transplantation of human Glial-Restricted Progenitors (hGRPs), lineage-restricted progenitors derived from human fetal neural tissue. Our previous findings demonstrated that transplantation of rodent-derived GRPs into cervical spinal cord ventral gray matter (in order to target therapy to diaphragmatic function) resulted in therapeutic efficacy in the SOD1(G93A) rat. Those findings demonstrated the feasibility and efficacy of transplantation-based …
Activation Of Matrix Metalloproteinases Following Anti-Aβ Immunotherapy; Implications For Microhemorrhage Occurrence, Donna M. Wilcock, Dave Morgan, Marcia N. Gordon, Tiffany L. Taylor, Lisa A. Ridnour, David A. Wink, Carol A. Colton
Activation Of Matrix Metalloproteinases Following Anti-Aβ Immunotherapy; Implications For Microhemorrhage Occurrence, Donna M. Wilcock, Dave Morgan, Marcia N. Gordon, Tiffany L. Taylor, Lisa A. Ridnour, David A. Wink, Carol A. Colton
Sanders-Brown Center on Aging Faculty Publications
BACKGROUND: Anti-Aβ immunotherapy is a promising approach to the prevention and treatment of Alzheimer's disease (AD) currently in clinical trials. There is extensive evidence, both in mice and humans that a significant adverse event is the occurrence of microhemorrhages. Also, vasogenic edema was reported in phase 2 of a passive immunization clinical trial. In order to overcome these vascular adverse effects it is critical that we understand the mechanism(s) by which they occur.
METHODS: We have examined the matrix metalloproteinase (MMP) protein degradation system in two previously published anti-Aβ immunotherapy studies. The first was a passive immunization study in which …
Cd40 Is Essential In The Upregulation Of Traf Proteins And Nf-Kappab-Dependent Proinflammatory Gene Expression After Arterial Injury, Zifang Song, Rong Jin, Shiyong Yu, Joshua J. Rivet, Susan S. Smyth, Anil Nanda, D. Neil Granger, Guohong Li
Cd40 Is Essential In The Upregulation Of Traf Proteins And Nf-Kappab-Dependent Proinflammatory Gene Expression After Arterial Injury, Zifang Song, Rong Jin, Shiyong Yu, Joshua J. Rivet, Susan S. Smyth, Anil Nanda, D. Neil Granger, Guohong Li
Internal Medicine Faculty Publications
Despite extensive investigations, restenosis, which is characterized primarily by neointima formation, remains an unsolved clinical problem after vascular interventions. A recent study has shown that CD40 signaling through TNF receptor associated factor 6 (TRAF6) plays a key role in neointima formation after carotid artery injury; however, underlying mechanisms are not clearly elucidated. Because neointima formation may vary significantly depending on the type of injury, we first assessed the effect of CD40 deficiency on neointima formation in 2 injury models, carotid artery ligation and femoral artery denudation injury. Compared with wild-type mice, CD40 deficiency significantly reduced neointima formation and lumen stenosis …
Targeted Over-Expression Of Glutamate Transporter 1 (Glt-1) Reduces Ischemic Brain Injury In A Rat Model Of Stroke, Brandon K. Harvey, Mikko Airavaara, Jason Michael Hinzman, Emily M. Wires, Matthew J. Chiocco, Douglas B. Howard, Hui Shen, Greg A. Gerhardt, Barry J. Hoffer, Yun Wang
Targeted Over-Expression Of Glutamate Transporter 1 (Glt-1) Reduces Ischemic Brain Injury In A Rat Model Of Stroke, Brandon K. Harvey, Mikko Airavaara, Jason Michael Hinzman, Emily M. Wires, Matthew J. Chiocco, Douglas B. Howard, Hui Shen, Greg A. Gerhardt, Barry J. Hoffer, Yun Wang
Neuroscience Faculty Publications
Following the onset of an ischemic brain injury, the excitatory neurotransmitter glutamate is released. The excitotoxic effects of glutamate are a major contributor to the pathogenesis of a stroke. The aim of this study was to examine if overexpression of a glutamate transporter (GLT-1) reduces ischemic brain injury in a rat model of stroke. We generated an adeno-associated viral (AAV) vector expressing the rat GLT-1 cDNA (AAV-GLT1). Functional expression of AAV-GLT1 was confirmed by increased glutamate clearance rate in non-stroke rat brain as measured by in vivo amperometry. AAV-GLT1 was injected into future cortical region of infarction 3 weeks prior …
Tlr4 Mutation Reduces Microglial Activation, Increases Aβ Deposits And Exacerbates Cognitive Deficits In A Mouse Model Of Alzheimer's Disease, Min Song, Jingji Jin, Jinghong Kou, Abhinandan Pattanayak, Jamaal Rehman, Hong-Duck Kim, Ken-Ichiro Fukuchi
Tlr4 Mutation Reduces Microglial Activation, Increases Aβ Deposits And Exacerbates Cognitive Deficits In A Mouse Model Of Alzheimer's Disease, Min Song, Jingji Jin, Jinghong Kou, Abhinandan Pattanayak, Jamaal Rehman, Hong-Duck Kim, Ken-Ichiro Fukuchi
NYMC Faculty Publications
BACKGROUND: Amyloid plaques, a pathological hallmark of Alzheimer's disease (AD), are accompanied by activated microglia. The role of activated microglia in the pathogenesis of AD remains controversial: either clearing Aβ deposits by phagocytosis or releasing proinflammatory cytokines and cytotoxic substances. Microglia can be activated via toll-like receptors (TLRs), a class of pattern-recognition receptors in the innate immune system. We previously demonstrated that an AD mouse model homozygous for a loss-of-function mutation of TLR4 had increases in Aβ deposits and buffer-soluble Aβ in the brain as compared with a TLR4 wild-type AD mouse model at 14-16 months of age. However, it …
The Levels Of Analysis Revisited., Scott A Macdougall-Shackleton
The Levels Of Analysis Revisited., Scott A Macdougall-Shackleton
Brain and Mind Institute Researchers' Publications
The term levels of analysis has been used in several ways: to distinguish between ultimate and proximate levels, to categorize different kinds of research questions and to differentiate levels of reductionism. Because questions regarding ultimate function and proximate mechanisms are logically distinct, I suggest that distinguishing between these two levels is the best use of the term. Integrating across levels in research has potential risks, but many benefits. Consideration at one level can help generate novel hypotheses at the other, define categories of behaviour and set criteria that must be addressed. Taking an adaptationist stance thus strengthens research on proximate …
Mitochondrial Oxidative Stress Drives Tumor Progression And Metastasis: Should We Use Antioxidants As A Key Component Of Cancer Treatment And Prevention?, Federica Sotgia, Ubaldo E Martinez-Outschoorn, Michael P Lisanti
Mitochondrial Oxidative Stress Drives Tumor Progression And Metastasis: Should We Use Antioxidants As A Key Component Of Cancer Treatment And Prevention?, Federica Sotgia, Ubaldo E Martinez-Outschoorn, Michael P Lisanti
Department of Stem Cell Biology and Regenerative Medicine Faculty Papers & Presentations
The functional role of oxidative stress in cancer pathogenesis has long been a hotly debated topic. A study published this month in BMC Cancer by Goh et al., directly addresses this issue by using a molecular genetic approach, via an established mouse animal model of human breast cancer. More specifically, alleviation of mitochondrial oxidative stress, via transgenic over-expression of catalase (an anti-oxidant enzyme) targeted to mitochondria, was sufficient to lower tumor grade (from high-to-low) and to dramatically reduce metastatic tumor burden by >12-fold. Here, we discuss these new findings and place them in the context of several other recent studies …
Methods And Animal Model For Analyzing Age-Related Macular Degeneration, Jayakrishna Ambati
Methods And Animal Model For Analyzing Age-Related Macular Degeneration, Jayakrishna Ambati
Ophthalmology and Visual Science Faculty Patents
Methods for testing candidate drugs for treatment of age-related macular degeneration are provided. Ccl2-deficient, and Ccr2-deficient mice are used to determine the effect of candidate drugs and treatments on development of age-related macular degeneration. Also provided is a Ccl2-deficient, Ccr2-deficient dual knockout mouse, which is a useful animal model for age-related macular degeneration.
Aging Enhances Serum Cytokine Response But Not Task-Induced Grip Strength Declines In A Rat Model Of Work-Related Musculoskeletal Disorders., Dong L Xin, Michelle Y Harris, Christine K Wade, Mamta Amin, Ann E Barr, Mary F Barbe
Aging Enhances Serum Cytokine Response But Not Task-Induced Grip Strength Declines In A Rat Model Of Work-Related Musculoskeletal Disorders., Dong L Xin, Michelle Y Harris, Christine K Wade, Mamta Amin, Ann E Barr, Mary F Barbe
Department of Physical Therapy Faculty Papers
BACKGROUND: We previously reported early tissue injury, increased serum and tissue inflammatory cytokines and decreased grip in young rats performing a moderate demand repetitive task. The tissue cytokine response was transient, the serum response and decreased grip were still evident by 8 weeks. Thus, here, we examined their levels at 12 weeks in young rats. Since aging is known to enhance serum cytokine levels, we also examined aged rats.
METHODS: Aged and young rats, 14 mo and 2.5 mo of age at onset, respectfully, were trained 15 min/day for 4 weeks, and then performed a high repetition, low force (HRLF) …
Proteomic Assessment Of A Cell Model Of Spinal Muscular Atrophy., Chia-Yen Wu, Dosh Whye, Lisa Glazewski, Leila Choe, Douglas Kerr, Kelvin H Lee, Robert W Mason, Wenlan Wang
Proteomic Assessment Of A Cell Model Of Spinal Muscular Atrophy., Chia-Yen Wu, Dosh Whye, Lisa Glazewski, Leila Choe, Douglas Kerr, Kelvin H Lee, Robert W Mason, Wenlan Wang
Department of Pediatrics Faculty Papers
BACKGROUND: Deletion or mutation(s) of the survival motor neuron 1 (SMN1) gene causes spinal muscular atrophy (SMA), a neuromuscular disease characterized by spinal motor neuron death and muscle paralysis. Complete loss of the SMN protein is embryonically lethal, yet reduced levels of this protein result in selective death of motor neurons. Why motor neurons are specifically targeted by SMN deficiency remains to be determined. In this study, embryonic stem (ES) cells derived from a severe SMA mouse model were differentiated into motor neurons in vitro by addition of retinoic acid and sonic hedgehog agonist. Proteomic and western blot analyses were …
Fus Transgenic Rats Develop The Phenotypes Of Amyotrophic Lateral Sclerosis And Frontotemporal Lobar Degeneration., Cao Huang, Hongxia Zhou, Jianbin Tong, Han Chen, Yong-Jian Liu, Dian Wang, Xiaotao Wei, Xu-Gang Xia
Fus Transgenic Rats Develop The Phenotypes Of Amyotrophic Lateral Sclerosis And Frontotemporal Lobar Degeneration., Cao Huang, Hongxia Zhou, Jianbin Tong, Han Chen, Yong-Jian Liu, Dian Wang, Xiaotao Wei, Xu-Gang Xia
Department of Pathology, Anatomy, and Cell Biology Faculty Papers
Fused in Sarcoma (FUS) proteinopathy is a feature of frontotemporal lobar dementia (FTLD), and mutation of the fus gene segregates with FTLD and amyotrophic lateral sclerosis (ALS). To study the consequences of mutation in the fus gene, we created transgenic rats expressing the human fus gene with or without mutation. Overexpression of a mutant (R521C substitution), but not normal, human FUS induced progressive paralysis resembling ALS. Mutant FUS transgenic rats developed progressive paralysis secondary to degeneration of motor axons and displayed a substantial loss of neurons in the cortex and hippocampus. This neuronal loss was accompanied by ubiquitin aggregation and …
Prolactin-Induced Mouse Mammary Carcinomas Model Estrogen Resistant Luminal Breast Cancer., Lisa M Arendt, Debra E Rugowski, Tara A Grafwallner-Huseth, Maria Jose Garcia-Barchino, Hallgeir Rui, Linda A Schuler
Prolactin-Induced Mouse Mammary Carcinomas Model Estrogen Resistant Luminal Breast Cancer., Lisa M Arendt, Debra E Rugowski, Tara A Grafwallner-Huseth, Maria Jose Garcia-Barchino, Hallgeir Rui, Linda A Schuler
Kimmel Cancer Center Faculty Papers
INTRODUCTION: Tumors that express estrogen receptor alpha (ERα+) comprise 75% of breast cancers in women. While treatments directed against this receptor have successfully lowered mortality rates, many primary tumors initially or later exhibit resistance. The paucity of murine models of this "luminal" tumor subtype has hindered studies of factors that promote their pathogenesis and modulate responsiveness to estrogen-directed therapeutics. Since epidemiologic studies closely link prolactin and the development of ERα+ tumors in women, we examined characteristics of the aggressive ERα+ and ERα- carcinomas which develop in response to mammary prolactin in a murine transgenic model (neu-related lipocalin- prolactin (NRL-PRL)). To …
Cx3cl1 Reduces Neurotoxicity And Microglial Activation In A Rat Model Of Parkinson's Disease, Mibel M. Pabon, Adam D. Bachstetter, Charles E. Hudson, Carmelina Gemma, Paula C. Bickford
Cx3cl1 Reduces Neurotoxicity And Microglial Activation In A Rat Model Of Parkinson's Disease, Mibel M. Pabon, Adam D. Bachstetter, Charles E. Hudson, Carmelina Gemma, Paula C. Bickford
Sanders-Brown Center on Aging Faculty Publications
BACKGROUND: Parkinson's disease is characterized by a progressive loss of dopaminergic neurons in the substantia nigra. The cause of the neurodegeneration is unknown. Neuroinflammation has been clearly shown in Parkinson's disease and may be involved in the progressive nature of the disease. Microglia are capable of producing neuronal damage through the production of bioactive molecules such as cytokines, as well as reactive oxygen species (ROS), and nitric oxide (NO). The inflammatory response in the brain is tightly regulated at multiple levels. One form of immune regulation occurs via neurons. Fractalkine (CX3CL1), produced by neurons, suppresses the activation of microglia. CX3CL1 …
Mpges-1 Null Mice Are Resistant To Bleomycin-Induced Skin Fibrosis, Matthew R. Mccann, Roxana Monemdjou, Parisa Ghassemi-Kakroodi, Hassan Fahmi, Gemma Perez, Shangxi Liu, Xu Shi-Wen, Sunil K. Parapuram, Fumiaki Kojima, Christopher P. Denton, David J. Abraham, Johanne Martel-Pelletier, Leslie J. Crofford, Andrew Leask, Mohit Kapoor
Mpges-1 Null Mice Are Resistant To Bleomycin-Induced Skin Fibrosis, Matthew R. Mccann, Roxana Monemdjou, Parisa Ghassemi-Kakroodi, Hassan Fahmi, Gemma Perez, Shangxi Liu, Xu Shi-Wen, Sunil K. Parapuram, Fumiaki Kojima, Christopher P. Denton, David J. Abraham, Johanne Martel-Pelletier, Leslie J. Crofford, Andrew Leask, Mohit Kapoor
Internal Medicine Faculty Publications
INTRODUCTION: Microsomal prostaglandin E2 synthase-1 (mPGES-1) is an inducible enzyme that acts downstream of cyclooxygenase (COX) to specifically catalyze the conversion of prostaglandin (PG) H2 to PGE2. mPGES-1 plays a key role in inflammation, pain and arthritis; however, the role of mPGES-1 in fibrogenesis is largely unknown. Herein, we examine the role of mPGES-1 in a mouse model of skin scleroderma using mice deficient in mPGES-1.
METHODS: Wild type (WT) and mPGES-1 null mice were subjected to the bleomycin model of cutaneous skin scleroderma. mPGES-1 expressions in scleroderma fibroblasts and in fibroblasts derived from bleomycin-exposed mice were assessed by Western …
Modulation Of Myocardial Mitochondrial Mechanisms During Severe Polymicrobial Sepsis In The Rat, M. Chopra, H. B. Golden, S. Mullapudi, W. Dowhan, D. E. Dostal, Avadhesh C. Sharma
Modulation Of Myocardial Mitochondrial Mechanisms During Severe Polymicrobial Sepsis In The Rat, M. Chopra, H. B. Golden, S. Mullapudi, W. Dowhan, D. E. Dostal, Avadhesh C. Sharma
PCOM Scholarly Papers
Background: We tested the hypothesis that 5-Hydroxydecanoic acid (5HD), a putative mitoKATP channel blocker, will reverse sepsis-induced cardiodynamic and adult rat ventricular myocyte (ARVM) contractile dysfunction, restore mitochondrial membrane permeability alterations and improve survival. Methodology/Principal Findings: Male Sprague-Dawley rats (350-400 g) were made septic using 400 mg/kg cecal inoculum, ip. Sham animals received 5% dextrose water, ip. The Voltage Dependent Anion Channels (VDAC1), Bax and cytochrome C levels were determined in isolated single ARVMs obtained from sham and septic rat heart. Mitochondria and cytosolic fractions were isolated from ARVMs treated with norepinephrine (NE, 10 µmoles) in the presence/absence of 5HD …