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https://www.readbyqxmd.com/read/29763633/estradiol-induced-enhancement-of-fear-extinction-in-female-rats-the-role-of-nmda-receptor-activation
#1
Bronwyn M Graham, Elliot Scott
Converging cross-species evidence indicates that fear extinction (the laboratory basis of exposure therapy for anxiety disorders) in females is modulated by endogenous and exogenous estradiol. The mechanisms underlying estradiol's influences on fear extinction are largely undefined. However, one likely candidate is the NMDA-receptor (NMDAr), activation of which is necessary for estradiol-mediated enhancements in structural and functional neural plasticity, as well as extinction consolidation in males. Here, we demonstrate that systemic co-administration of the non-competitive NMDAr antagonist, MK801, blocked the enhancement of fear extinction by systemic estradiol in ovariectomized rats...
May 12, 2018: Progress in Neuro-psychopharmacology & Biological Psychiatry
https://www.readbyqxmd.com/read/29689137/insight-into-vitamin-b-6-dependent-epilepsy-due-to-plpbp-previously-prosc-missense-mutations
#2
Lorena Tremiño, Alicia Forcada-Nadal, Vicente Rubio
Vitamin B6 -dependent genetic epilepsy was recently associated to mutations in PLPBP (previously PROSC), the human version of the widespread COG0325 gene that encodes TIM-barrel-like pyridoxal phosphate (PLP)-containing proteins of unclear function. We produced recombinantly, purified and characterized human PROSC (called now PLPHP) and its six missense mutants reported in epileptic patients. Normal PLPHP is largely a monomer with PLP bound through a Schiff-base linkage. The PLP-targeting antibiotic D-cycloserine decreased the PLP-bound peak as expected for pseudo-first-order reaction...
April 24, 2018: Human Mutation
https://www.readbyqxmd.com/read/29661461/urgent-living-donor-liver-transplantation-in-a-patient-with-concurrent-active-tuberculosis-a-case-report
#3
B-H Jung, J-I Park, S-G Lee
BACKGROUND: Although active tuberculosis (TB) is considered a contraindication for liver transplantation (LT), this is the only treatment in patients with liver failure and concurrent active TB. We report a case with successful urgent living-donor LT for irreversible liver failure in the presence of active TB. CASE PRESENTATION: A 48-year-old man, with a history of decompensated alcoholic liver cirrhosis, was presented with stupor. At admission, his consciousness had deteriorated to semi-coma, and his renal function also rapidly deteriorated to hepatorenal syndrome...
April 2018: Transplantation Proceedings
https://www.readbyqxmd.com/read/29580893/d-cycloserine-facilitates-reversal-in-an-animal-model-of-post-traumatic-stress-disorder
#4
Sophie A George, Mariana Rodriguez-Santiago, John Riley, James L Abelson, Stan B Floresco, Israel Liberzon
Many psychiatric disorders are associated with cognitive dysfunction that is ineffectively treated by existing pharmacotherapies and which may contribute to poor real-world functioning. D-cycloserine (DCS) is a partial N-methyl-D-aspartate (NMDA) agonist that has attracted attention because of its cognitive enhancing properties, including in people with post-traumatic stress disorder (PTSD). Here, we examined the effect of DCS on reversal learning - a type of cognitive flexibility - following exposure to single prolonged stress (SPS), a rodent model of PTSD...
March 23, 2018: Behavioural Brain Research
https://www.readbyqxmd.com/read/29580634/the-relationship-between-posttraumatic-and-depressive-symptoms-during-virtual-reality-exposure-therapy-with-a-cognitive-enhancer
#5
Melissa Peskin, Katarzyna Wyka, Judith Cukor, Megan Olden, Margaret Altemus, Francis S Lee, JoAnn Difede
Two studies suggest that reductions in posttraumatic symptoms (Aderka et al., 2013) and cognitions (Zalta et al., 2014) precede reductions in depressive symptoms during prolonged exposure (PE) therapy for posttraumatic stress disorder (PTSD) in female assault survivors. The present study explored the temporal relationship between posttraumatic and depressive symptoms in a randomized trial of D-Cycloserine (DCS) versus placebo augmented virtual reality exposure (VRE) therapy for chronic World Trade Center-related PTSD following the September 11, 2001 terrorist attacks...
March 10, 2018: Journal of Anxiety Disorders
https://www.readbyqxmd.com/read/29579424/a-selective-and-sensitive-high-performance-liquid-chromatography-assay-for-the-determination-of-cycloserine-in-human-plasma
#6
A K Hemanth Kumar, Arun Kumar Polisetty, V Sudha, A Vijayakumar, Geetha Ramachandran
BACKGROUND: Cycloserine (CYC) is a second line antitubercular drug that is used for the treatment of multidrug resistant tuberculosis (MDR-TB) along with other antitubercular agents and is often used in developing countries. Monitoring CYC levels in plasma could be useful in the clinical management of patients with MDR-TB. A high performance liquid chromatography method for the determination of CYC in human plasma was developed. METHODS: The method involved extraction of the sample using solid phase extraction cartridges and analysis of the extracted sample using a reverse phase T3 column (150mm) and detection at 240nm with Photo Diode Array (PDA) detector...
April 2018: Indian Journal of Tuberculosis
https://www.readbyqxmd.com/read/29518533/improving-culture-media-for-the-isolation-of-clostridium-difficile-from-compost
#7
Muthu Dharmasena, Xiuping Jiang
This study was to optimize the detection methods for Clostridium difficile from the animal manure-based composts. Both autoclaved and unautoclaved dairy composts were inoculated with a 12-h old suspension of a non-toxigenic C. difficile strain (ATCC 43593) and then plated on selected agar for vegetative cells and endospores. Six types of enrichment broths supplemented with taurocholate and l-cysteine were assessed for detecting a low level of artificially inoculated C. difficile (ca. 5 spores/g) from dairy composts...
March 6, 2018: Anaerobe
https://www.readbyqxmd.com/read/29517350/development-and-validation-of-a-new-protocol-for-detecting-and-recovering-clostridium-difficile-from-meat-samples
#8
Majda Biasizzo, Stanka Vadnjal, Urska Henigman, Manja Krizman, Andrej Kirbis, Urska Jamnikar-Ciglenecki
There is no recommended protocol for detecting and isolating Clostridium difficile present in food samples. Here, we have evaluated the recovery of C. difficile in meat samples after incubating them in various enrichment broths. The media were as follows: cycloserine-cefoxitin fructose broth supplemented with taurocholic acid, d-cycloserine, cefoxitin, and lysozyme; cycloserine-cefoxitin mannitol broth with taurocholate and lysozyme; and cycloserine-cefoxitin fructose broth supplemented with taurocholic acid, C...
April 2018: Journal of Food Protection
https://www.readbyqxmd.com/read/29492616/intra-hippocampal-d-cycloserine-rescues-decreased-social-memory-spatial-learning-reversal-and-synaptophysin-levels-in-aged-rats
#9
Marta Portero-Tresserra, Margarita Martí-Nicolovius, Mireia Tarrés-Gatius, Ana Candalija, Gemma Guillazo-Blanch, Anna Vale-Martínez
RATIONALE: Aging is characterized by a decrease in N-methyl-D-aspartate receptors (NMDARs) in the hippocampus, which might be one of the factors involved in the age-dependent cognitive decline. D-Cycloserine (DCS), a partial agonist of the NMDAR glycine recognition site, could improve memory deficits associated to neurodegenerative disorders and cognitive deficits observed in normal aging. OBJECTIVES AND METHODS: The aim of the present study was to explore whether DCS would reverse age-dependent memory deficits and decreases in NMDA receptor subunits (GluN1, GluN2A, and GluN2B) and the presynaptic protein synaptophysin in Wistar rats...
May 2018: Psychopharmacology
https://www.readbyqxmd.com/read/29476986/anti-tuberculosis-drug-prescribing-for-inpatients-in-a-national-tuberculosis-hospital-of-china-2011-2015
#10
Jun An, Xuejuan Bai, Mengqiu Gao, Naihui Chu, Hairong Huang, Hongyin Xu, Xiuping Zhang, Baoxia Li, Cailiu Huang, Haixia Cai, Fengqin Zhang, Yu Pang, Liang Li
OBJECTIVE: Our objective was to describe trends in anti-tuberculosis (TB) drug prescribing of inpatients from 2011 to 2015 in a National TB Hospital. METHODS: We carried out this study in March 2016, which retrospectively reviewed the medical records of all inpatients diagnosed as tuberculosis between 2011 and 2015. We recorded the medication used for the treatment of TB during the inpatient period. RESULTS: A total of 11465 inpatients from Beijing Chest Hospital were enrolled in this analysis...
February 21, 2018: Journal of Global Antimicrobial Resistance
https://www.readbyqxmd.com/read/29476015/a-novel-retrieval-dependent-memory-process-revealed-by-the-arrest-of-erk1-2-activation-in-the-basolateral-amygdala
#11
Emiliano Merlo, Amy L Milton, Barry J Everitt
Fully consolidated fear memories can be maintained or inhibited by retrieval-dependent mechanisms depending on the degree of re-exposure to fear cues. Short exposures promote memory maintenance through reconsolidation, and long exposures promote inhibition through extinction. Little is known about the neural mechanisms by which increasing cue exposure overrides reconsolidation and instead triggers extinction. Using auditory fear conditioning in male rats, we analyzed the role of a molecular mechanism common to reconsolidation and extinction of fear, ERK1/2 activation within the basolateral amygdala (BLA), after intermediate conditioned stimulus (CS) exposure events...
March 28, 2018: Journal of Neuroscience: the Official Journal of the Society for Neuroscience
https://www.readbyqxmd.com/read/29471908/prognostic-factors-for-treatment-success-in-patients-with-multidrug-resistant-tuberculosis-in-china
#12
Y-M Fan, S-P Ding, Z-J Bao, L-M Wu, L-B Zhen, Q Xia, M Zhu
OBJECTIVE: To examine the clinical outcomes and associated prognostic factors among patients with multidrug-resistant tuberculosis (MDR-TB) in China. METHODS: This retrospective study involved 243 patients with MDR-TB. All patients received standard regimens containing para-amino salicylic acid (PAS) and/or cycloserine (CS). The demographic, social and clinical characteristics of patients were recorded and the patients were followed up for 24 months. RESULTS: Treatment success was closely associated with young age, non-farming occupations, shorter history or smoking, normal urine results, initial MDR-TB treatment regimen, increased haemoglobin, direct bilirubin, uric acid and thyroid stimulating hormone (TSH) levels, and lower white blood cell, neutrophil and blood platelet counts (all P < 0...
March 1, 2018: International Journal of Tuberculosis and Lung Disease
https://www.readbyqxmd.com/read/29465478/glutamatergic-modulators-in-depression
#13
Ioline D Henter, Rafael Teixeira de Sousa, Carlos A Zarate
Both preclinical and clinical studies have implicated glutamatergic system dysfunction in the pathophysiology of mood disorders such as bipolar depression and major depressive disorder. In particular, rapid reductions in depressive symptoms have been noted in response to subanesthetic doses of the glutamatergic modulator ketamine in subjects with major depressive disorder or bipolar depression. These results have prompted the repurposing or development of other glutamatergic modulators, both as monotherapy or adjunctive to other therapies...
February 20, 2018: Harvard Review of Psychiatry
https://www.readbyqxmd.com/read/29463539/pharmacokinetics-of-second-line-antituberculosis-drugs-in-children-with-multidrug-resistant-tuberculosis-in-india
#14
Agibothu Kupparam Hemanth Kumar, Alok Kumar, Thiruvengadam Kannan, Rakesh Bhatia, Dipti Agarwal, Santosh Kumar, Rajeshwar Dayal, Sheo Pratap Singh, Geetha Ramachandran
We studied the pharmacokinetics of levofloxacin (LFX), pyrazinamide (PZA), ethionamide (ETH), and cycloserine (CS) in children with multidrug-resistant tuberculosis (MDR-TB) who were being treated according to the Revised National TB Control Programme (RNTCP) guidelines in India. This observational, pharmacokinetic study was conducted in 25 children with MDR-TB at the Sarojini Naidu Medical College, Agra, India, who were being treated with a 24-month daily regimen. Serial blood samples were collected after directly observed administration of drugs...
May 2018: Antimicrobial Agents and Chemotherapy
https://www.readbyqxmd.com/read/29446699/investigating-d-cycloserine-as-a-potential-pharmacological-enhancer-of-an-emotional-bias-learning-procedure
#15
Marcella L Woud, Simon E Blackwell, Susann Steudte-Schmiedgen, Michael Browning, Emily A Holmes, Catherine J Harmer, Jürgen Margraf, Andrea Reinecke
The partial N-methyl-D-aspartate receptor agonist d-cycloserine may enhance psychological therapies. However, its exact mechanism of action is still being investigated. Cognitive bias modification techniques allow isolation of cognitive processes and thus investigation of how they may be affected by d-cycloserine. We used a cognitive bias modification paradigm targeting appraisals of a stressful event, Cognitive Bias Modification-Appraisal, to investigate whether d-cycloserine enhanced the modification of appraisal, and whether it caused greater reduction in indices of psychopathology...
May 2018: Journal of Psychopharmacology
https://www.readbyqxmd.com/read/29434874/antitumor-effects-of-matrine-on-cancer-stem-like-cells-isolated-from-the-human-liver-cancer-smmc-7721-cell-line
#16
Yong Wang, Yahui Liu, Jianshuai Jiang, Hanbin Cui
The existence of cancer stem cells (CSCs) or cancer stem-like cells (CSLCs) is regarded as the cause of tumor formation and recurrence. Matrine has been reported to exhibit antitumor effects in cancer cells. In the present study, a preliminary study was performed on the mechanisms of matrine on hepatocellular carcinoma (HCC) stem-like cells. The HCC SMMC-7721 cell line was cultured in tumor stem cell-specific medium to form spheres, and different concentrations (1, 2 and 5 mg/kg) of cisplatin were then used in order to purify the most drug-resistant cells, which were used as CSLCs...
February 2018: Oncology Letters
https://www.readbyqxmd.com/read/29432876/effects-of-d-cycloserine-on-individual-differences-in-relapse-of-fear
#17
Gabrielle King, Bronwyn M Graham, Rick Richardson
The major weakness of psychological and pharmacological interventions for anxiety disorders is that the fear often returns. We examined whether DCS, which has attracted considerable attention as a potential pharmacological adjunct to therapy, reduces relapse, and whether individual differences in the rate of extinction modulates its effectiveness in reducing relapse. Experimentally-naïve adult male rats received pairings of a white noise CS with a shock US, extinction to a criterion immediately followed by an injection of DCS or Saline, and then were tested for relapse of fear (renewal, spontaneous recovery, or reinstatement; in four separate experiments)...
June 8, 2018: Progress in Neuro-psychopharmacology & Biological Psychiatry
https://www.readbyqxmd.com/read/29413527/the-role-of-serine-racemase-in-the-pathophysiology-of-brain-disorders
#18
Joseph T Coyle, Darrick T Balu
The N-methyl-d-aspartate receptor (NMDAR) is unique in requiring two agonists to bind simultaneously to open its cation channel: the neurotransmitter, glutamate, and the coagonists, glycine, or d-serine. The Snyder laboratory was the first to clone serine racemase (SR), the enzyme that synthesizes d-serine, and to localize it immunocytochemically. Our laboratory has focused on the role of d-serine in brain disorders. Silencing the expression of SR, a risk gene for schizophrenia (SCZ), in mice (SR-/-), results in a phenotype that closely resembles SCZ including: cortical atrophy, reduced dendritic spine density and complexity, downregulation of parvalbumin-positive cortical GABAergic neurons, and cognitive impairments...
2018: Advances in Pharmacology
https://www.readbyqxmd.com/read/29392444/plasmid-to-generate-mycobacteria-mutants
#19
Qi Deng, Jianzhou Meng, Yan Guan, Yishuang Liu, Chunling Xiao
The generation of conditional mutants has been an effective approach to studying bacteria and validating drug targets, and mutants of Mycobacteria are no exception. However unlike other bacteria, there is still a paucity of available tools for Mycobacteria. We constructed a new plasmid containing tetracycline-repressive expression system (TetRr1.7) and Xer Site-Specific recombinase system to generate label-free controllable expression strains. The plasmid was subsequently used to construct a strain of M. tuberculosis expressing the only copy of D-alanine:D-alanine ligase under the control of the tetracycline-repressive promoter...
February 1, 2018: AMB Express
https://www.readbyqxmd.com/read/29370281/correction-d-cycloserine-improves-synaptic-transmission-in-an-animal-mode-of-rett-syndrome
#20
Elisa S Na, Héctor De Jesús-Cortés, Arlene Martinez-Rivera, Zeeba D Kabir, Jieqi Wang, Vijayashree Ramesh, Yasemin Onder, Anjali M Rajadhyaksha, Lisa M Monteggia, Andrew A Pieper
[This corrects the article DOI: 10.1371/journal.pone.0183026.].
2018: PloS One
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