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  1. Article: Extinction as a deficit of the decision-making circuitry in the posterior parietal cortex.

    Christopoulos, Vassilios N / Andersen, Kristen N / Andersen, Richard A

    Handbook of clinical neurology

    2018  Volume 151, Page(s) 163–182

    Abstract: Extinction is a common neurologic deficit that often occurs as one of a constellation of symptoms seen with lesions of the posterior parietal cortex (PPC). Although extinction has typically been considered a deficit in the allocation of attention, new ... ...

    Abstract Extinction is a common neurologic deficit that often occurs as one of a constellation of symptoms seen with lesions of the posterior parietal cortex (PPC). Although extinction has typically been considered a deficit in the allocation of attention, new findings, particularly from nonhuman primate studies, point to one potential and important source of extinction as damage to decision-making circuits for actions within the PPC. This new understanding provides clues to potential therapies for extinction. Also the finding that the PPC is important for action decisions and action planning has led to new neuroprosthetic applications using PPC recordings as control signals to assist paralyzed patients.
    MeSH term(s) Animals ; Decision Making/physiology ; Humans ; Parietal Lobe/physiopathology ; Perceptual Disorders/physiopathology
    Language English
    Publishing date 2018-03-08
    Publishing country Netherlands
    Document type Journal Article ; Review
    ISSN 0072-9752
    ISSN 0072-9752
    DOI 10.1016/B978-0-444-63622-5.00008-5
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  2. Article ; Online: Creating site-specific isopeptide linkages between proteins with the traceless Staudinger ligation.

    Andersen, Kristen A / Raines, Ronald T

    Methods in molecular biology (Clifton, N.J.)

    2015  Volume 1248, Page(s) 55–65

    Abstract: Site-specific isopeptide linkages between the ε-amino group of a lysine residue in one protein and a carboxyl group in another are central to ubiquitin-mediated protein degradation and other cellular processes. These linkages are inaccessible with common ...

    Abstract Site-specific isopeptide linkages between the ε-amino group of a lysine residue in one protein and a carboxyl group in another are central to ubiquitin-mediated protein degradation and other cellular processes. These linkages are inaccessible with common recombinant DNA techniques. Here, we describe a method to link two proteins by an authentic isopeptide bond. The method unites three techniques at the forefront of molecular biology. An azidonorleucine residue is installed at a desired site in a substrate protein by nonnatural amino acid incorporation, and a phosphinothioester is installed at the C terminus of a pendant protein by expressed protein ligation. Then, the traceless Staudinger ligation is used to link the substrate and pendant proteins via an isopeptide bond. This method facilitates the study of otherwise intractable protein structure-function relationships.
    MeSH term(s) Cross-Linking Reagents/chemistry ; Peptides/chemistry ; Proteins/chemistry
    Chemical Substances Cross-Linking Reagents ; Peptides ; Proteins
    Language English
    Publishing date 2015
    Publishing country United States
    Document type Journal Article ; Research Support, N.I.H., Extramural ; Research Support, Non-U.S. Gov't ; Review
    ISSN 1940-6029
    ISSN (online) 1940-6029
    DOI 10.1007/978-1-4939-2020-4_4
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  3. Article ; Online: Trifluoroiodomethane as a Precursor to High Global Warming Potential Climate Pollutants: Could the Transformation of Climatically Benign CF

    Taddonio, Kristen N / Dreyfus, Gabrielle B / Andersen, Stephen O / Ravishankara, A R

    Environmental science & technology

    2023  Volume 57, Issue 32, Page(s) 11731–11737

    Abstract: The transition away from the production and consumption of high global warming potential (GWP) hydrofluorocarbons (HFCs) under the 2016 Kigali Amendment to the Montreal Protocol on Substances that Deplete the Ozone Layer (Montreal Protocol) has prompted ... ...

    Abstract The transition away from the production and consumption of high global warming potential (GWP) hydrofluorocarbons (HFCs) under the 2016 Kigali Amendment to the Montreal Protocol on Substances that Deplete the Ozone Layer (Montreal Protocol) has prompted air conditioning, refrigeration, and heat pump equipment manufacturers to seek alternative refrigerants with lower direct climate impacts. Additional factors affecting alternative refrigerant choice include safety (i.e., flammability and toxicity), environmental, and thermodynamic constraints. At the same time, manufacturers are incentivized to seek refrigerants with higher energy efficiency, which saves on electricity costs and reduces indirect greenhouse gas emissions from electricity generation. The life cycle climate performance (LCCP) metric is commonly used to assess the combined direct and indirect climate impacts of refrigerant-use equipment. Here, we consider an additional impact on climate performance: the degradation of refrigerant in equipment, i.e., the direct climate impacts of high-GWP byproducts that can form as the result of adding trifluoroiodomethane (CF
    MeSH term(s) Global Warming ; Environmental Pollutants ; Greenhouse Gases ; Air Pollutants/analysis ; Rwanda
    Chemical Substances Environmental Pollutants ; Greenhouse Gases ; trifluoroiodomethane (42A379KB0U) ; Air Pollutants
    Language English
    Publishing date 2023-08-03
    Publishing country United States
    Document type Journal Article ; Review
    ISSN 1520-5851
    ISSN (online) 1520-5851
    DOI 10.1021/acs.est.3c01079
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  4. Article ; Online: Gender Moderates Results of a Randomized Clinical Trial for the Khanya Intervention for Substance Use and ART Adherence in HIV Care in South Africa.

    Belus, Jennifer M / Joska, John A / Bronsteyn, Yosef / Rose, Alexandra L / Andersen, Lena S / Regenauer, Kristen S / Myers, Bronwyn / Hahn, Judith A / Orrell, Catherine / Safren, Steve A / Magidson, Jessica F

    AIDS and behavior

    2022  Volume 26, Issue 11, Page(s) 3630–3641

    Abstract: Little is known about gender effects of alcohol and drug use (AOD) among people living with HIV (PLWH) in resource-limited settings. Using multilevel models, we tested whether gender moderated the effect of Khanya, a cognitive-behavioral therapy-based ... ...

    Abstract Little is known about gender effects of alcohol and drug use (AOD) among people living with HIV (PLWH) in resource-limited settings. Using multilevel models, we tested whether gender moderated the effect of Khanya, a cognitive-behavioral therapy-based intervention addressing antiretroviral (ART) adherence and AOD reduction. We enrolled 61 participants from HIV care and examined outcomes at 3- and 6-months compared to enhanced treatment as usual (ETAU). Gender significantly moderated the effect of Khanya on ART adherence (measured using electronically-monitored and biomarker-confirmed adherence), such that women in Khanya had significantly lower ART adherence compared to men in Khanya; no gender differences were found for AOD outcomes. Exploratory trajectory analyses showed men in Khanya and both genders in ETAU had significant reductions in at least one AOD outcome; women in Khanya did not. More research is needed to understand whether a gender lens can support behavioral interventions for PLWH with AOD.Trial registry ClinicalTrials.gov identifier: NCT03529409. Trial registered on May 18, 2018.
    MeSH term(s) Anti-Retroviral Agents/therapeutic use ; Female ; HIV Infections/drug therapy ; HIV Infections/epidemiology ; Humans ; Male ; Medication Adherence ; South Africa/epidemiology ; Substance-Related Disorders/complications ; Substance-Related Disorders/epidemiology
    Chemical Substances Anti-Retroviral Agents
    Language English
    Publishing date 2022-07-27
    Publishing country United States
    Document type Journal Article ; Randomized Controlled Trial
    ZDB-ID 1339885-4
    ISSN 1573-3254 ; 1090-7165
    ISSN (online) 1573-3254
    ISSN 1090-7165
    DOI 10.1007/s10461-022-03765-8
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  5. Article ; Online: Interventions for Pancreatitis-New Approaches, Knowledge Gaps, and Research Opportunities: Summary of a National Institute of Diabetes and Digestive and Kidney Diseases Workshop.

    Phillips, Anna Evans / Hughes, Steven J / Andersen, Dana K / Bell, Adam / Brand, Randall / Coté, Gregory A / Cowdin, Adriana / Diazgranados, Nancy / Dudeja, Vikas / Duggan, Sinead N / Fogel, Evan / Forsmark, Chris E / Freeman, A Jay / Gittes, George / Hart, Phil A / Jeon, Christie / Nealon, William / Neoptolemos, John / Palermo, Tonya M /
    Pandol, Stephen / Roberts, Kristen M / Rosenthal, Martin / Singh, Vikesh K / Yadav, Dhiraj / Whitcomb, David C / Zyromski, Nicholas

    Pancreas

    2024  Volume 53, Issue 4, Page(s) e368–e377

    Abstract: Abstract: There exists no cure for acute, recurrent acute or chronic pancreatitis and treatments to date have been focused on managing symptoms. A recent workshop held by the National Institute of Diabetes and Digestive and Kidney Diseases (NIDDK) ... ...

    Abstract Abstract: There exists no cure for acute, recurrent acute or chronic pancreatitis and treatments to date have been focused on managing symptoms. A recent workshop held by the National Institute of Diabetes and Digestive and Kidney Diseases (NIDDK) focused on interventions that might disrupt or perhaps even reverse the natural course of this heterogenous disease, aiming to identify knowledge gaps and research opportunities that might inform future funding initiatives for NIDDK. The breadth and variety of identified active or planned clinical trials traverses the spectrum of the disease and was conceptually grouped for the workshop into behavioral, nutritional, pharmacologic and biologic, and mechanical interventions. Cognitive and other behavioral therapies are proven interventions for pain and addiction, but barriers exist to their use. Whilst a disease specific instrument quantifying pain is now validated, an equivalent is lacking for nutrition - and both face challenges in ease and frequency of administration. Multiple pharmacologic agents hold promise. Ongoing development of Patient Reported Outcome (PRO) measurements can satisfy Investigative New Drug (IND) regulatory assessments. Despite multiple randomized clinical trials demonstrating benefit, great uncertainty remains regarding patient selection, timing of intervention, and type of mechanical intervention (endoscopic versus surgery). Challenges and opportunities to establish beneficial interventions for patients were identified.
    MeSH term(s) Humans ; Diabetes Mellitus/diagnosis ; Diabetes Mellitus/therapy ; National Institute of Diabetes and Digestive and Kidney Diseases (U.S.) ; Pain ; Pancreatitis, Chronic/therapy ; Pancreatitis, Chronic/drug therapy ; United States
    Language English
    Publishing date 2024-03-13
    Publishing country United States
    Document type Congress
    ZDB-ID 632831-3
    ISSN 1536-4828 ; 0885-3177
    ISSN (online) 1536-4828
    ISSN 0885-3177
    DOI 10.1097/MPA.0000000000002333
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  6. Article ; Online: Optic ataxia: from Balint's syndrome to the parietal reach region.

    Andersen, Richard A / Andersen, Kristen N / Hwang, Eun Jung / Hauschild, Markus

    Neuron

    2014  Volume 81, Issue 5, Page(s) 967–983

    Abstract: Optic ataxia is a high-order deficit in reaching to visual goals that occurs with posterior parietal cortex (PPC) lesions. It is a component of Balint's syndrome that also includes attentional and gaze disorders. Aspects of optic ataxia are misreaching ... ...

    Abstract Optic ataxia is a high-order deficit in reaching to visual goals that occurs with posterior parietal cortex (PPC) lesions. It is a component of Balint's syndrome that also includes attentional and gaze disorders. Aspects of optic ataxia are misreaching in the contralesional visual field, difficulty preshaping the hand for grasping, and an inability to correct reaches online. Recent research in nonhuman primates (NHPs) suggests that many aspects of Balint's syndrome and optic ataxia are a result of damage to specific functional modules for reaching, saccades, grasp, attention, and state estimation. The deficits from large lesions in humans are probably composite effects from damage to combinations of these functional modules. Interactions between these modules, either within posterior parietal cortex or downstream within frontal cortex, may account for more complex behaviors such as hand-eye coordination and reach-to-grasp.
    MeSH term(s) Agnosia/physiopathology ; Animals ; Ataxia/physiopathology ; Attention/physiology ; Humans ; Parietal Lobe/physiopathology ; Psychomotor Performance/physiology
    Language English
    Publishing date 2014-03-05
    Publishing country United States
    Document type Journal Article ; Research Support, Non-U.S. Gov't ; Review
    ZDB-ID 808167-0
    ISSN 1097-4199 ; 0896-6273
    ISSN (online) 1097-4199
    ISSN 0896-6273
    DOI 10.1016/j.neuron.2014.02.025
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  7. Article ; Online: Serum Biomarkers of Nociceptive and Neuropathic Pain in Chronic Pancreatitis.

    Saloman, Jami L / Li, Yan / Stello, Kimberly / Li, Wenhao / Li, Shuang / Phillips, Anna Evans / Hall, Kristen / Fogel, Evan L / Vege, Santhi Swaroop / Li, Liang / Andersen, Dana K / Fisher, William E / Forsmark, Christopher E / Hart, Phil A / Pandol, Stephen J / Park, Walter G / Topazian, Mark D / Van Den Eeden, Stephen K / Serrano, Jose /
    Conwell, Darwin L / Yadav, Dhiraj

    The journal of pain

    2023  Volume 24, Issue 12, Page(s) 2199–2210

    Abstract: Debilitating abdominal pain is a common symptom affecting most patients with chronic pancreatitis (CP). There are multiple underlying mechanisms that contribute to CP-related pain, which makes successful treatment difficult. The identification of ... ...

    Abstract Debilitating abdominal pain is a common symptom affecting most patients with chronic pancreatitis (CP). There are multiple underlying mechanisms that contribute to CP-related pain, which makes successful treatment difficult. The identification of biomarkers for subtypes of pain could provide viable targets for nonopioid interventions and the development of mechanistic approaches to pain management in CP. Nineteen inflammation- and nociception-associated proteins were measured in serum collected from 358 subjects with definite CP enrolled in PROspective Evaluation of Chronic Pancreatitis for EpidEmiologic and Translational StuDies, a prospective observational study of pancreatitis in US adult subjects. First, serum levels of putative biomarkers were compared between CP subjects with and without pain. Only platelet-derived growth factor B (PDGF-B) stood out, with levels significantly higher in the CP pain group as compared to subjects with no pain. Subjects with pain were then stratified into 4 pain subtypes (Neuropathic, Nociceptive, Mixed, and Unclassified). A comparison of putative biomarker concentration among 5 groups (no pain and 4 pain subtypes) identified unique proteins that were correlated with pain subtypes. Serum transforming growth factor beta 1 (TGFβ1) level was significantly higher in the Nociceptive pain group compared to the No pain group, suggesting that TGFβ1 may be a biomarker for nociceptive pain. The Neuropathic pain only group was too small to detect statistical differences. However, glycoprotein 130 (GP130), a coreceptor for interleukin 6, was significantly higher in the Mixed pain group compared to the groups lacking a neuropathic pain component. These data suggest that GP130 may be a biomarker for neuropathic pain in CP. PERSPECTIVE: Serum TGFβ1 and GP130 may be biomarkers for nociceptive and neuropathic CP pain, respectively. Preclinical data suggest inhibiting TGFβ1 or GP130 reduces CP pain in rodent models, indicating that additional translational and clinical studies may be warranted to develop a precision medicine approach to the management of pain in CP.
    MeSH term(s) Adult ; Humans ; Biomarkers ; Chronic Pain ; Cytokine Receptor gp130 ; Neuralgia/diagnosis ; Neuralgia/etiology ; Neuralgia/drug therapy ; Nociception ; Nociceptive Pain ; Pancreatitis, Chronic/complications ; Pancreatitis, Chronic/diagnosis
    Chemical Substances Biomarkers ; Cytokine Receptor gp130 (133483-10-0)
    Language English
    Publishing date 2023-07-13
    Publishing country United States
    Document type Observational Study ; Journal Article
    ZDB-ID 2018789-0
    ISSN 1528-8447 ; 1526-5900
    ISSN (online) 1528-8447
    ISSN 1526-5900
    DOI 10.1016/j.jpain.2023.07.006
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  8. Article ; Online: Intrinsic site-selectivity of ubiquitin dimer formation.

    Andersen, Kristen A / Martin, Langdon J / Prince, Joel M / Raines, Ronald T

    Protein science : a publication of the Protein Society

    2015  Volume 24, Issue 2, Page(s) 182–189

    Abstract: The post-translational modification of proteins with ubiquitin can take on many forms, including the decoration of substrates with polymeric ubiquitin chains. These chains are linked through one of the seven lysine residues in ubiquitin, with the ... ...

    Abstract The post-translational modification of proteins with ubiquitin can take on many forms, including the decoration of substrates with polymeric ubiquitin chains. These chains are linked through one of the seven lysine residues in ubiquitin, with the potential to form a panoply of linkage combinations as the chain length increases. The ensuing structural diversity of modifications serves a variety of signaling functions. Still, some linkages are present at a much higher level than others in cellulo. Although ubiquitination is an enzyme-catalyzed process, the large disparity of abundancies led us to the hypothesis that some linkages might be intrinsically faster to form than others, perhaps directing the course of enzyme evolution. Herein, we assess the kinetics of ubiquitin dimer formation in an enzyme-free system by measuring the rate constants for thiol-disulfide interchange between appropriate ubiquitin variants. Remarkably, we find that the kinetically expedient linkages correlate with those that are most abundant in cellulo. As the abundant linkages also appear to function more broadly in cellulo, this correlation suggests that the more accessible chains were selected for global roles.
    MeSH term(s) Disulfides/chemistry ; Humans ; Models, Molecular ; Protein Multimerization ; Ubiquitin/chemistry ; Ubiquitination
    Chemical Substances Disulfides ; Ubiquitin
    Language English
    Publishing date 2015-02
    Publishing country United States
    Document type Journal Article ; Research Support, N.I.H., Extramural ; Research Support, Non-U.S. Gov't
    ZDB-ID 1106283-6
    ISSN 1469-896X ; 0961-8368
    ISSN (online) 1469-896X
    ISSN 0961-8368
    DOI 10.1002/pro.2603
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  9. Article ; Online: Boronic Acid for the Traceless Delivery of Proteins into Cells.

    Andersen, Kristen A / Smith, Thomas P / Lomax, Jo E / Raines, Ronald T

    ACS chemical biology

    2015  Volume 11, Issue 2, Page(s) 319–323

    Abstract: The use of exogenous proteins as intracellular probes and therapeutic agents is in its infancy. A major hurdle has been the delivery of native proteins to an intracellular site of action. Herein, we report on a compact delivery vehicle that employs the ... ...

    Abstract The use of exogenous proteins as intracellular probes and therapeutic agents is in its infancy. A major hurdle has been the delivery of native proteins to an intracellular site of action. Herein, we report on a compact delivery vehicle that employs the intrinsic affinity of boronic acids for the carbohydrates that coat the surface of mammalian cells. In the vehicle, benzoxaborole is linked to protein amino groups via a "trimethyl lock." Immolation of this linker is triggered by cellular esterases, releasing native protein. Efficacy is demonstrated by enhanced delivery of green fluorescent protein and a cytotoxic ribonuclease into mammalian cells. This versatile strategy provides new opportunities in chemical biology and pharmacology.
    MeSH term(s) Animals ; Boronic Acids/chemistry ; Boronic Acids/metabolism ; CHO Cells ; Cell Line, Tumor ; Cell Membrane Permeability ; Cricetulus ; Drug Carriers/chemistry ; Drug Carriers/metabolism ; Green Fluorescent Proteins/administration & dosage ; Green Fluorescent Proteins/chemistry ; Green Fluorescent Proteins/pharmacokinetics ; Humans ; Models, Molecular ; Ribonucleases/administration & dosage ; Ribonucleases/chemistry ; Ribonucleases/pharmacokinetics
    Chemical Substances Boronic Acids ; Drug Carriers ; Green Fluorescent Proteins (147336-22-9) ; Ribonucleases (EC 3.1.-)
    Language English
    Publishing date 2015-12-15
    Publishing country United States
    Document type Journal Article ; Research Support, N.I.H., Extramural ; Research Support, Non-U.S. Gov't ; Research Support, U.S. Gov't, Non-P.H.S.
    ISSN 1554-8937
    ISSN (online) 1554-8937
    DOI 10.1021/acschembio.5b00966
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  10. Article ; Online: Low frequency power in cerebral blood flow is a biomarker of neurologic injury in the acute period after cardiac arrest.

    White, Brian R / Ko, Tiffany S / Morgan, Ryan W / Baker, Wesley B / Benson, Emilie J / Lafontant, Alec / Starr, Jonathan P / Landis, William P / Andersen, Kristen / Jahnavi, Jharna / Breimann, Jake / Delso, Nile / Morton, Sarah / Roberts, Anna L / Lin, Yuxi / Graham, Kathryn / Berg, Robert A / Yodh, Arjun G / Licht, Daniel J /
    Kilbaugh, Todd J

    Resuscitation

    2022  Volume 178, Page(s) 12–18

    Abstract: Aim: Cardiac arrest often results in severe neurologic injury. Improving care for these patients is difficult as few noninvasive biomarkers exist that allow physicians to monitor neurologic health. The amount of low-frequency power (LFP, 0.01-0.1 Hz) in ...

    Abstract Aim: Cardiac arrest often results in severe neurologic injury. Improving care for these patients is difficult as few noninvasive biomarkers exist that allow physicians to monitor neurologic health. The amount of low-frequency power (LFP, 0.01-0.1 Hz) in cerebral haemodynamics has been used in functional magnetic resonance imaging as a marker of neuronal activity. Our hypothesis was that increased LFP in cerebral blood flow (CBF) would be correlated with improvements in invasive measures of neurologic health.
    Methods: We adapted the use of LFP for to monitoring of CBF with diffuse correlation spectroscopy. We asked whether LFP (or other optical biomarkers) correlated with invasive microdialysis biomarkers (lactate-pyruvate ratio - LPR - and glycerol concentration) of neuronal injury in the 4 h after return of spontaneous circulation in a swine model of paediatric cardiac arrest (Sus scrofa domestica, 8-11 kg, 51% female). Associations were tested using a mixed linear effects model.
    Results: We found that higher LFP was associated with higher LPR and higher glycerol concentration. No other biomarkers were associated with LPR; cerebral haemoglobin concentration, oxygen extraction fraction, and one EEG metric were associated with glycerol concentration.
    Conclusion: Contrary to expectations, higher LFP in CBF was correlated with worse invasive biomarkers. Higher LFP may represent higher neurologic activity, or disruptions in neurovascular coupling. Either effect may be harmful in the acute period after cardiac arrest. Thus, these results suggest our methodology holds promise for development of new, clinically relevant biomarkers than can guide resuscitation and post-resuscitation care. Institutional protocol number: 19-001327.
    MeSH term(s) Biomarkers ; Cerebrovascular Circulation/physiology ; Female ; Glycerol ; Heart Arrest/complications ; Humans ; Male ; Resuscitation
    Chemical Substances Biomarkers ; Glycerol (PDC6A3C0OX)
    Language English
    Publishing date 2022-07-08
    Publishing country Ireland
    Document type Journal Article ; Research Support, N.I.H., Extramural ; Research Support, Non-U.S. Gov't
    ZDB-ID 189901-6
    ISSN 1873-1570 ; 0300-9572
    ISSN (online) 1873-1570
    ISSN 0300-9572
    DOI 10.1016/j.resuscitation.2022.07.004
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