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https://www.readbyqxmd.com/read/29029586/use-and-misuse-of-opioids-in-chronic-pain
#1
Nora Volkow, Helene Benveniste, A Thomas McLellan
The prescribing of opioid analgesics for pain management-particularly for management of chronic noncancer pain (CNCP)-has increased more than fourfold in the United States since the mid-1990s. Yet there is mounting evidence that opioids have only limited effectiveness in the management of CNCP, and the increased availability of prescribed opioids has contributed to upsurges in opioid-related addiction cases and overdose deaths. These concerns have led to critical revisiting and modification of prior pain management practices (e...
October 13, 2017: Annual Review of Medicine
https://www.readbyqxmd.com/read/28979253/rapid-gene-turnover-as-a-significant-source-of-genetic-variation-in-a-recently-seeded-population-of-a-healthcare-associated-pathogen
#2
Lucía Graña-Miraglia, Luis F Lozano, Consuelo Velázquez, Patricia Volkow-Fernández, Ángeles Pérez-Oseguera, Miguel A Cevallos, Santiago Castillo-Ramírez
Genome sequencing has been useful to gain an understanding of bacterial evolution. It has been used for studying the phylogeography and/or the impact of mutation and recombination on bacterial populations. However, it has rarely been used to study gene turnover at microevolutionary scales. Here, we sequenced Mexican strains of the human pathogen Acinetobacter baumannii sampled from the same locale over a 3 year period to obtain insights into the microevolutionary dynamics of gene content variability. We found that the Mexican A...
2017: Frontiers in Microbiology
https://www.readbyqxmd.com/read/28974452/long-term-optical-imaging-of-neurovascular-coupling-in-mouse-cortex-using-gcamp6f-and-intrinsic-hemodynamic-signals
#3
Xiaochun Gu, Wei Chen, Jiang You, Alan P Koretsky, N D Volkow, Yingtian Pan, Congwu Du
Cerebral hemodynamics is modulated in response to changes in neuronal activity, a process termed neurovascular coupling (NVC), which can be disrupted by neuropsychiatric diseases (e.g., stroke, Alzheimer's disease). Thus, there is growing interest to image long-term NVC dynamics with high spatiotemporal resolutions. Here, by combining the use of a genetically-encoded calcium indicator with optical techniques, we develop a longitudinal multimodal optical imaging platform (MIP) that enabled time-lapse tracking of NVC over a relatively large field of view in the mouse somatosensory cortex at single cell and single vessel resolutions...
September 30, 2017: NeuroImage
https://www.readbyqxmd.com/read/28930574/food-addiction-a-common-neurobiological-mechanism-with-drug-abuse
#4
Elsa Lindgren, Kyle Gray, Gregg Miller, Ryan Tyler, Corinde E Wiers, Nora D Volkow, Gene-Jack Wang
Drugs and food both exert a rewarding effect through the firing of dopamine neurons in the ventral tegmental area, resulting in the release of dopamine into the nucleus accumbens and effects on the mesolimbic pathway. Here, we review the neuroimaging literature to consider the validity of food addiction and the common neurobiological mechanisms that overlap in food and drug addiction. This review paper focuses on findings from Positron Emission Tomography (PET), functional Magnetic Resonance Imaging (fMRI) and structural imaging studies, as well as evidence from neuroimaging studies of bariatric surgery and pharmacological interventions on obese individuals...
January 1, 2018: Frontiers in Bioscience (Landmark Edition)
https://www.readbyqxmd.com/read/28918267/compulsivity-in-opioid-dependence
#5
Serenella Tolomeo, Keith Matthews, Douglas Steele, Alex Baldacchino
OBJECTIVE: This study aimed to investigate the relationship between compulsivity versus impulsivity and structural MRI abnormalities in opioid dependence. METHOD: We recruited 146 participants: i) patients with a history of opioid dependence due to chronic heroin use (n=24), ii) heroin users stabilised on methadone maintenance treatment (n=48), iii) abstinent participants with a history of opioid dependence due to heroin use (n=24) and iv) healthy controls (n=50)...
September 14, 2017: Progress in Neuro-psychopharmacology & Biological Psychiatry
https://www.readbyqxmd.com/read/28736021/infectious-complications-and-multidrug-resistant-bacteria-in-patients-with-hematopoietic-stem-cell-transplantation-in-the-first-12-months-after-transplant
#6
A César-Arce, P Volkow-Fernández, L M Valero-Saldaña, B Acosta-Maldonado, D Vilar-Compte, P Cornejo-Juárez
BACKGROUND: Hematopoietic stem cell transplantation (HSCT) has been used as treatment in different hematologic and solid malignancies. The aim of this study was to describe the frequency of infectious complications, microbiology, and outcome in patients undergoing HSCT in Mexico during the pre-engraftment period and the impact on mortality rates at 12 months. METHODS: We conducted a retrospective study of all hematologic malignancies that received HSCT from January 2009 and December 2014, at an oncology reference center...
July 2017: Transplantation Proceedings
https://www.readbyqxmd.com/read/28731033/linking-brain-connectivity-and-behavior-after-acute-and-chronic-alcohol-exposure
#7
E Shokri-Kojori, D Tomasi, C E Wiers, G-J Wang, N D Volkow
No abstract text is available yet for this article.
August 2017: Molecular Psychiatry
https://www.readbyqxmd.com/read/28682879/sociodemographic-differences-among-hiv-positive-and-hiv-negative-recently-pregnant-women-in-mexico-city-a-case-control-study
#8
Daniel Aguilar-Zapata, Alicia Piñeirúa-Menéndez, Patricia Volkow-Fernández, Patricia Rodríguez-Zulueta, Ubaldo Ramos-Alamillo, Teresita Cabrera-López, Alexandra Martin-Onraet
National HIV preventive programs in Mexico focus on high-risk groups that do not consider women, apart from prenatal screening. Nonetheless, the epidemic in women is growing, and there is a need to better understand sociodemographic factors in women living with HIV (WLH). We performed a case-control study in Mexico City, including HIV+ and HIV- women with a recent pregnancy to compare their sociodemographic characteristics and describe the circumstances of diagnosis in HIV+ women, as well as prenatal screening frequency in both groups...
July 2017: Medicine (Baltimore)
https://www.readbyqxmd.com/read/28643800/striatal-dopamine-d2-d3-receptor-availability-varies-across-smoking-status
#9
Corinde E Wiers, Elizabeth A Cabrera, Dardo Tomasi, Christopher T Wong, Şükrü B Demiral, Sung Won Kim, Gene-Jack Wang, Nora D Volkow
To assess how tobacco smoking status affects baseline dopamine D2/D3 (D2R) receptor availability and methylphenidate-induced dopamine (DA) release, we retrospectively analyzed D2R availability measures of 8 current smokers, 10 ex-smokers, and 18 nonsmokers who were scanned with positron emission tomography and [(11)C]raclopride, after administration of an injection of placebo or 0.5 mg/kg i.v. methylphenidate. There was a significant effect of smoking status on baseline striatal D2R availability; with current smokers showing lower striatal D2R availability compared with nonsmokers (caudate, putamen, and ventral striatum) and with ex-smokers (caudate and putamen)...
November 2017: Neuropsychopharmacology: Official Publication of the American College of Neuropsychopharmacology
https://www.readbyqxmd.com/read/28580946/dopamine-d2-receptor-signaling-in-the-nucleus-accumbens-comprises-a-metabolic-cognitive-brain-interface-regulating-metabolic-components-of-glucose-reinforcement
#10
Michael Michaelides, Michael L Miller, Jennifer A DiNieri, Juan L Gomez, Elizabeth Schwartz, Gabor Egervari, Gene Jack Wang, Charles V Mobbs, Nora D Volkow, Yasmin L Hurd
Appetitive drive is influenced by coordinated interactions between brain circuits that regulate reinforcement and homeostatic signals that control metabolism. Glucose modulates striatal dopamine (DA) and regulates appetitive drive and reinforcement learning. Striatal DA D2 receptors (D2Rs) also regulate reinforcement learning and are implicated in glucose-related metabolic disorders. Nevertheless, interactions between striatal D2R and peripheral glucose have not been previously described. Here we show that manipulations involving striatal D2R signaling coincide with perseverative and impulsive-like responding for sucrose, a disaccharide consisting of fructose and glucose...
November 2017: Neuropsychopharmacology: Official Publication of the American College of Neuropsychopharmacology
https://www.readbyqxmd.com/read/28564549/the-role-of-science-in-addressing-the-opioid-crisis
#11
Nora D Volkow, Francis S Collins
Opioid misuse and addiction is an ongoing and rapidly evolving public health crisis, requiring innovative scientific solutions. In response, and because no existing medication is ideal for every patient, the National Institutes of Health (NIH) is joining with private partners to launch an..
July 27, 2017: New England Journal of Medicine
https://www.readbyqxmd.com/read/28558783/clinical-characteristics-predictors-of-immune-reconstitution-inflammatory-syndrome-and-long-term-prognosis-in-patients-with-kaposi-sarcoma
#12
Patricia Volkow, Gabriela Cesarman-Maus, Pamela Garciadiego-Fossas, Enrique Rojas-Marin, Patricia Cornejo-Juárez
OBJECTIVE: To investigate the predictive factors for the development of Kaposi sarcoma-related immune reconstitution inflammatory syndrome (KS-IRIS) and long-term prognosis in patients starting combined antiretroviral therapy (cART). METHODS: We studied a retrospective-cohort of consecutive antiretroviral-naïve patients with KS initiating cART from January 2005 to December 2011 and followed through June 2013. KS-IRIS was defined as ≥2 of the following: abrupt increase in number of KS lesions, appearance or exacerbation of lung-opacities or lymphedema, concomitantly with an increase in CD4+ cell-count ≥50 cells/mm(3) and a decrease of >1 log in viral-load once started cART...
May 30, 2017: AIDS Research and Therapy
https://www.readbyqxmd.com/read/28534658/dynamic-brain-glucose-metabolism-identifies-anti-correlated-cortical-cerebellar-networks-at-rest
#13
Dardo G Tomasi, Ehsan Shokri-Kojori, Corinde E Wiers, Sunny W Kim, Şukru B Demiral, Elizabeth A Cabrera, Elsa Lindgren, Gregg Miller, Gene-Jack Wang, Nora D Volkow
It remains unclear whether resting state functional magnetic resonance imaging (rfMRI) networks are associated with underlying synchrony in energy demand, as measured by dynamic 2-deoxy-2-[(18)F]fluoroglucose (FDG) positron emission tomography (PET). We measured absolute glucose metabolism, temporal metabolic connectivity (t-MC) and rfMRI patterns in 53 healthy participants at rest. Twenty-two rfMRI networks emerged from group independent component analysis (gICA). In contrast, only two anti-correlated t-MC emerged from FDG-PET time series using gICA or seed-voxel correlations; one included frontal, parietal and temporal cortices, the other included the cerebellum and medial temporal regions...
January 1, 2017: Journal of Cerebral Blood Flow and Metabolism
https://www.readbyqxmd.com/read/28531257/lack-of-evidence-for-benefit-from-long-term-use-of-opioid-analgesics-for-patients-with-neuropathy
#14
Nora D Volkow, Walter Koroshetz
No abstract text is available yet for this article.
July 1, 2017: JAMA Neurology
https://www.readbyqxmd.com/read/28466758/the-glymphatic-pathway
#15
Helene Benveniste, Hedok Lee, Nora D Volkow
The overall premise of this review is that cerebrospinal fluid (CSF) is transported within a dedicated peri-vascular network facilitating metabolic waste clearance from the central nervous system while we sleep. The anatomical profile of the network is complex and has been defined as a peri-arterial CSF influx pathway and peri-venous clearance routes, which are functionally coupled by interstitial bulk flow supported by astrocytic aquaporin 4 water channels. The role of the newly discovered system in the brain is equivalent to the lymphatic system present in other body organs and has been termed the "glymphatic pathway" or "(g)lymphatics" because of its dependence on glial cells...
January 1, 2017: Neuroscientist: a Review Journal Bringing Neurobiology, Neurology and Psychiatry
https://www.readbyqxmd.com/read/28448515/chronic-cocaine-induces-hif-vegf-pathway-activation-along-with-angiogenesis-in-the-brain
#16
Wei Yin, Kevin Clare, Qiujia Zhang, Nora D Volkow, Congwu Du
Cocaine induces vasoconstriction in cerebral vessels, which with repeated use can result in transient ischemic attacks and cerebral strokes. However, the neuroadaptations that follow cocaine's vasoconstricting effects are not well understood. Here, we investigated the effects of chronic cocaine exposure (2 and 4 weeks) on markers of vascular function and morphology in the rat brain. For this purpose we measured nitric oxide (NO) concentration in plasma, brain neuronal nitric oxide synthase (nNOS or NOS1), HIF-1α, and VEGF expression in different brain regions, i...
2017: PloS One
https://www.readbyqxmd.com/read/28445570/medical-marijuana-laws-and-cannabis-use-intersections-of-health-and-policy
#17
Wilson M Compton, Nora D Volkow, Marsha F Lopez
No abstract text is available yet for this article.
April 26, 2017: JAMA Psychiatry
https://www.readbyqxmd.com/read/28418460/marijuana-use-during-stages-of-pregnancy-in-the-united-states
#18
Nora D Volkow, Beth Han, Wilson M Compton, Carlos Blanco
No abstract text is available yet for this article.
May 16, 2017: Annals of Internal Medicine
https://www.readbyqxmd.com/read/28416594/new-repeat-polymorphism-in-the-akt1-gene-predicts-striatal-dopamine-d2-d3-receptor-availability-and-stimulant-induced-dopamine-release-in-the-healthy-human-brain
#19
Elena Shumay, Corinde E Wiers, Ehsan Shokri-Kojori, Sung Won Kim, Colin A Hodgkinson, Hui Sun, Dardo Tomasi, Christopher T Wong, Daniel R Weinberger, Gene-Jack Wang, Joanna S Fowler, Nora D Volkow
The role of the protein kinase Akt1 in dopamine neurotransmission is well recognized and has been implicated in schizophrenia and psychosis. However, the extent to which variants in the AKT1 gene influence dopamine neurotransmission is not well understood. Here we investigated the effect of a newly characterized variant number tandem repeat (VNTR) polymorphism in AKT1 [major alleles: L- (eight repeats) and H- (nine repeats)] on striatal dopamine D2/D3 receptor (DRD2) availability and on dopamine release in healthy volunteers...
May 10, 2017: Journal of Neuroscience: the Official Journal of the Society for Neuroscience
https://www.readbyqxmd.com/read/28385464/microbiology-of-surgical-site-infections-in-patients-with-cancer-a-7-year-review
#20
Juan Carlos Hernaiz-Leonardo, Maria Fernanda Golzarri, Patricia Cornejo-Juárez, Patricia Volkow, Consuelo Velázquez, Mauricio Ostrosky-Frid, Diana Vilar-Compte
BACKGROUND: Health care-associated infections (HAIs) have arisen as major sources of multidrug-resistant bacteria. Surgical site infections (SSIs) are the most frequent HAIs in many countries, with high antimicrobial-resistant prevalence. METHODS: A 7-year retrospective review (2008-2014) of microbiologic data within a prospective surveillance program on patients with SSI at a cancer hospital in Mexico. RESULTS: There were 23,421 surgeries performed during the study period...
July 1, 2017: American Journal of Infection Control
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