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https://www.readbyqxmd.com/read/28089557/lower-total-and-regional-grey-matter-brain-volumes-in-youth-with-perinatally-acquired-hiv-infection-associations-with-hiv-disease-severity-substance-use-and-cognition
#1
C Paula Lewis-De Los Angeles, Paige L Williams, Yanling Huo, Shirlene D Wang, Kristina A Uban, Megan M Herting, Kathleen Malee, Ram Yogev, John G Csernansky, Sharon Nichols, Russell B Van Dyke, Elizabeth R Sowell, Lei Wang
Despite improved survival due to combination antiretroviral therapy (cART), youth with perinatally-acquired HIV (PHIV) show cognitive deficits and developmental delay at increased rates. HIV affects the brain during critical periods of development, and the brain may be a persistent reservoir for HIV due to suboptimal blood brain barrier penetration of cART. We conducted structural magnetic resonance imaging (sMRI) and cognitive testing in 40 PHIV youth (mean age=16.7 years) recruited from the NIH Pediatric HIV/AIDS Cohort Study (PHACS) who are part of the first generation of PHIV youth surviving into adulthood...
January 9, 2017: Brain, Behavior, and Immunity
https://www.readbyqxmd.com/read/28086758/toxoplasmosis-associated-iris-involving-the-cns-a-case-report-with-longitudinal-analysis-of-t-cell-subsets
#2
Rita Rb-Silva, Claudia Nobrega, Eugénia Reiriz, Soraia Almeida, Rui Sarmento-Castro, Margarida Correia-Neves, Ana Horta
BACKGROUND: HIV-infected patients may present an unforeseen clinical worsening after initiating antiretroviral therapy known as immune reconstitution inflammatory syndrome (IRIS). This syndrome is characterized by a heightened inflammatory response toward infectious or non-infectious triggers, and it may affect different organs. Diagnosis of IRIS involving the central nervous system (CNS-IRIS) is challenging due to heterogeneous manifestations, absence of biomarkers to identify this condition, risk of long-term sequelae and high mortality...
January 13, 2017: BMC Infectious Diseases
https://www.readbyqxmd.com/read/28081038/impact-of-hiv-infection-and-antiretroviral-treatment-on-n-terminal-prohormone-of-brain-natriuretic-peptide-as-surrogate-of-myocardial-function
#3
Christopher Schuster, Christina Binder, Robert Strassl, Maximilian C Aichelburg, Emma Blackwell, Noemi Pavo, Michael Ramharter, Martin Hülsmann, Katharina Grabmeier-Pfistershammer, Armin Rieger, Georg Goliasch
OBJECTIVE: Vasoactive cardiovascular hormones such as the N-terminal prohormone of brain natriuretic peptide (NT-proBNP) are produced upon ventricular stretch and play a central role in neurohumoral pathways of the heart regulating cardiovascular remodeling and volume homeostasis. The impact of HIV infection on these neurohumoral pathways of the heart and its potential reversibility by combinations of antiretroviral therapies remain unclear. METHODS: We assessed serum levels of NT-proBNP in 219 antiretroviral therapy-naïve HIV-infected patients with a normal cardiac and renal status at treatment initiation and after attainment of viremic control...
January 28, 2017: AIDS
https://www.readbyqxmd.com/read/28079886/hiv-1-nef-is-released-in-extracellular-vesicles-derived-from-astrocytes-evidence-for-nef-mediated-neurotoxicity
#4
A Sami Saribas, Stephanie Cicalese, Taha Mohseni Ahooyi, Kamel Khalili, Shohreh Amini, Ilker Kudret Sariyer
Human immunodeficiency virus-associated neurological disorders (HANDs) affect the majority of AIDS patients and are a significant problem among HIV-1-infected individuals who live longer because of combined anti-retroviral therapies. HIV-1 utilizes a number of viral proteins and subsequent cytokine inductions to unleash its toxicity on neurons. Among HIV-1 viral proteins, Nef is a small protein expressed abundantly in astrocytes of HIV-1-infected brains and has been suggested to have a role in the pathogenesis of HAND...
January 12, 2017: Cell Death & Disease
https://www.readbyqxmd.com/read/28076974/topological-organization-of-whole-brain-white-matter-in-hiv-infection
#5
Laurie M Baker, Sarah Cooley, Ryan P Cabeen, David H Laidlaw, John A Joska, Jacqueline Hoare, Dan J Stein, Jodi Heaps-Woodruff, Lauren E Salminen, Robert H Paul
Infection with human immunodeficiency virus (HIV) is associated with neuroimaging alterations. However, little is known about the topological organization of whole-brain networks and the corresponding association with cognition. As such, we examined structural whole-brain white matter connectivity patterns and cognitive performance in 29 HIV+ young adults (mean age = 25.9) with limited or no HIV treatment history. HIV+ participants and demographically similar HIV- controls (n = 16) residing in South Africa underwent magnetic resonance imaging (MRI) and neuropsychological testing...
January 11, 2017: Brain Connectivity
https://www.readbyqxmd.com/read/28074940/alpha7-nicotinic-acetylcholine-receptor-is-required-for-amyloid-pathology-in-brain-endothelial-cells-induced-by-glycoprotein-120-methamphetamine-and-nicotine
#6
Liqun Liu, Jingyi Yu, Li Li, Bao Zhang, Lingjuan Liu, Chun-Hua Wu, Ambrose Jong, Ding-An Mao, Sheng-He Huang
One of the most challenging issues in HIV-associated neurocognitive disorders (HAND) caused by HIV-1 virotoxins and drug abuse is the lack of understanding the underlying mechanisms that are commonly associated with disorders of the blood-brain barrier (BBB), which mainly consists of brain microvascular endothelial cells (BMEC). Here, we hypothesized that Glycoprotein 120 (gp120), methamphetamine (METH) and nicotine (NT) can enhance amyloid-beta (Aβ) accumulation in BMEC through Alpha7 nicotinic acetylcholine receptor (α7 nAChR)...
January 11, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28068915/comparison-of-clinical-features-and-prognostic-factors-in-hiv-negative-adults-with-cryptococcal-meningitis-and-tuberculous-meningitis-a-retrospective-study
#7
Junyan Qu, Taoyou Zhou, Cejun Zhong, Rong Deng, Xiaoju Lü
BACKGROUND: The incidence of cryptococcal meningitis (CM) and tuberculous meningitis (TBM) have gradually increased in recent years. These two types of meningitis are easily misdiagnosed which leads to a poor prognosis. In this study we compared differences of clinical features and prognostic factors in non-HIV adults with CM and TBM. METHODS: We retrospectively reviewed the medical records of CM and TBM patients from January 2008 to December 2015 in our university hospital in China...
January 10, 2017: BMC Infectious Diseases
https://www.readbyqxmd.com/read/28058461/pet-brain-imaging-in-hiv-associated-neurocognitive-disorders-hand-in-the-era-of-combination-antiretroviral-therapy
#8
REVIEW
Jaime H Vera, Basil Ridha, Yvonne Gilleece, Aliza Amlani, Patrick Thorburn, Sabina Dizdarevic
Effective combination antiretroviral therapy (cART) has lead to a significant reduction in the prevalence and incidence of central nervous system (CNS) HIV-associated brain disease, particularly CNS opportunistic infections and HIV encephalitis. Despite this, cognitive deficits in people living with HIV, also known as HIV-associated neurocognitive disorders (HAND) have become more prevalent in recent years. The pathogenesis of HAND is likely to be multifactorial, however recent evidence suggests that brain microglial activation is the most likely pathogenic mechanism...
January 5, 2017: European Journal of Nuclear Medicine and Molecular Imaging
https://www.readbyqxmd.com/read/28057474/hiv-1-tat-disrupts-blood-brain-barrier-integrity-and-increases-phagocytic-perivascular-macrophages-and-microglia-in-the-dorsal-striatum-of-transgenic-mice
#9
Crystal R Leibrand, Jason J Paris, M Said Ghandour, Pamela E Knapp, Woong-Ki Kim, Kurt F Hauser, MaryPeace McRae
HIV-1 infection results in blood brain barrier (BBB) disruption, which acts as a rate-limiting step for HIV-1 entry into the CNS and for subsequent neuroinflammatory/neurotoxic actions. One mechanism by which HIV may destabilize the BBB involves actions of the HIV-1 regulatory protein, trans-activator of transcription (Tat). We utilized a conditional, Tat-expressing transgenic murine model to examine the influence of Tat1-86 expression on BBB integrity and to assess the relative numbers of phagocytic perivascular macrophages and microglia within the CNS in vivo...
January 2, 2017: Neuroscience Letters
https://www.readbyqxmd.com/read/28046096/early-antiretroviral-therapy-is-associated-with-lower-hiv-dna-molecular-diversity-and-lower-inflammation-in-cerebrospinal-fluid-but-does-not-prevent-the-establishment-of-compartmentalized-hiv-dna-populations
#10
Michelli F Oliveira, Antoine Chaillon, Masato Nakazawa, Milenka Vargas, Scott L Letendre, Matthew C Strain, Ronald J Ellis, Sheldon Morris, Susan J Little, Davey M Smith, Sara Gianella
Even when antiretroviral therapy (ART) is started early after infection, HIV DNA might persist in the central nervous system (CNS), possibly contributing to inflammation, brain damage and neurocognitive impairment. Paired blood and cerebrospinal fluid (CSF) were collected from 16 HIV-infected individuals on suppressive ART: 9 participants started ART <4 months of the estimated date of infection (EDI) ("early ART"), and 7 participants started ART >14 months after EDI ("late ART"). For each participant, neurocognitive functioning was measured by Global Deficit Score (GDS)...
January 3, 2017: PLoS Pathogens
https://www.readbyqxmd.com/read/28040512/extracellular-vesicles-of-the-blood-brain-barrier-role-in-the-hiv-1-associated-amyloid-beta-pathology
#11
Ibolya E András, Ana Leda, Marta Garcia Contreras, Luc Bertrand, Minseon Park, Marta Skowronska, Michal Toborek
HIV-infected brains are characterized by increased amyloid beta (Aβ) deposition. It is believed that the blood-brain barrier (BBB) is critical for Aβ homeostasis and contributes to Aβ accumulation in the brain. Extracellular vesicles (ECV), like exosomes, recently gained a lot of attention as potentially playing a significant role in Aβ pathology. In addition, HIV-1 hijacks the exosomal pathway for budding and release. Therefore, we investigated the involvement of BBB-derived ECV in the HIV-1-induced Aβ pathology in the brain...
December 29, 2016: Molecular and Cellular Neurosciences
https://www.readbyqxmd.com/read/28017149/htlv-1-associated-neurological-disorders
#12
Muhammad Yasir Khan, Ishaq Nasib Khan, Muhammad Farman, Saleh Al Karim, Ishtiaq Qadri, Muhammad Amjad Kamal, Khalid Al Ghamdi, Steve Harakeh
Human T-cell lymphotropic virus type 1 (HTLV-1) is a retrovirus which is endemic to certain regions of the world and infects around 10-20 million people. HTLV-1 is the etiologic agent of Adult T cell leukemia/lymphoma and HTLV-1 associated neurological disorders including mainly HTLV-1 associated myelopathy/Tropical spastic paraparesis. The involvement of the central nervous diseases occurs among: HTLV-1 infected patients from endemic areas, HIV positive individuals and drug users. The ability of HTLV-1 to cause associated neuropathies starts with the virus crossing the blood brain barrier (BBB), then entering and infecting the cells of the central nervous system...
December 22, 2016: Current Topics in Medicinal Chemistry
https://www.readbyqxmd.com/read/28008980/antiretroviral-treatment-with-efavirenz-disrupts-the-blood-brain-barrier-integrity-and-increases-stroke-severity
#13
Luc Bertrand, Levi Dygert, Michal Toborek
The introduction of antiretroviral drugs (ARVd) changed the prognosis of HIV infection from a deadly disease to a chronic disease. However, even with undetectable viral loads, patients still develop a wide range of pathologies, including cerebrovascular complications and stroke. It is hypothesized that toxic side effects of ARVd may contribute to these effects. To address this notion, we evaluated the impact of several non-nucleoside reverse transcriptase inhibitors (NNRTI; Efavirenz, Etravirine, Rilpivirine and Nevirapine) on the integrity of the blood-brain barrier, and their impact on severity of stroke...
December 23, 2016: Scientific Reports
https://www.readbyqxmd.com/read/28004435/biopsy-proven-case-of-epstein-barr-virus-ebv-associated-vasculitis-of-the-central-nervous-system
#14
Kohei Kano 鹿野耕平, Takayuki Katayama, Shiori Takeguchi, Asuka Asanome, Kae Takahashi, Tsukasa Saito, Jun Sawada, Masato Saito, Ryogo Anei, Kyousuke Kamada, Naoyuki Miyokawa, Hiroshi Nishihara, Naoyuki Hasebe
A 75-year-old woman was admitted to our hospital with rapidly deteriorating consciousness disturbance. She had a 7-year history of rheumatoid arthritis (RA), which had been treated with methotrexate (MTX) and prednisolone. Brain T2-weighted MRI showed diffuse high-intensity lesions in the cerebral subcortical and deep white matter, bilateral basal ganglia and thalamus. A cerebrospinal fluid examination revealed elevated protein levels and positive Epstein-Barr virus (EBV) DNA. Human immunodeficiency virus was negative...
December 22, 2016: Neuropathology: Official Journal of the Japanese Society of Neuropathology
https://www.readbyqxmd.com/read/27995575/cerebrospinal-fluid-biomarkers-and-hiv-associated-neurocognitive-disorders-in-hiv-infected-individuals-in-rakai-uganda
#15
Mahsa Abassi, Bozena M Morawski, Gertrude Nakigozi, Noeline Nakasujja, Xiangrong Kong, David B Meya, Kevin Robertson, Ronald Gray, Maria J Wawer, Ned Sacktor, David R Boulware
In the USA, increased cerebrospinal fluid (CSF) inflammatory cytokines have been observed in antiretroviral therapy (ART)-naive, HIV-seropositive individuals with HIV-associated neurocognitive disorder (HAND). We characterized the relationship between HAND and CSF biomarker expression in ART-naive, HIV-seropositive individuals in Rakai, Uganda. We analyzed CSF of 78 HIV-seropositive, ART-naive Ugandan adults for 17 cytokines and 20 neurodegenerative biomarkers via Luminex multiplex assay. These adults underwent neurocognitive assessment to determine their degree of HAND...
December 19, 2016: Journal of Neurovirology
https://www.readbyqxmd.com/read/27994072/hiv-1-latency-reversing-agents-prostratin-and-bryostatin-1-induce-blood-brain-barrier-disruption-inflammation-and-modulate-leukocyte-adhesion-transmigration
#16
Clélia Dental, Alizé Proust, Michel Ouellet, Corinne Barat, Michel J Tremblay
A shock-and-kill approach involving the simultaneous treatment of HIV-1-infected patients with latency-reversing agents (LRAs) and combination antiretroviral therapy was proposed as a means to eradicate viral reservoirs. Currently available LRAs cannot discriminate between HIV-1-infected and uninfected cells. Therefore, the risks and benefits of using broad-spectrum LRAs need to be carefully evaluated, particularly in the CNS, where inflammation and leukocyte transmigration must be tightly regulated. We used a real-time impedance-sensing system to dynamically record the impact of different classes of LRAs on the integrity of tight monolayers of the immortalized human cerebral microvascular endothelial cell line hCMEC/D3...
December 19, 2016: Journal of Immunology: Official Journal of the American Association of Immunologists
https://www.readbyqxmd.com/read/27989126/iron-chelation-nanoparticles-with-delayed-saturation-as-an-effective-therapy-for-parkinson-disease
#17
Nan Wang, Xin Jin, Dongbo Guo, Gangsheng Tong, Xinyuan Zhu
Iron accumulation in substantia nigra pars compacta (SNpc) has been proved to be a prominent pathophysiological feature of Parkinson's diseases (PD), which can induce the death of dopaminergic (DA) neurons, up-regulation of reactive oxygen species (ROS), and further loss of motor control. In recent years, iron chelation therapy has been demonstrated to be an effective treatment for PD, which has shown significant improvements in clinical trials. However, the current iron chelators are suboptimal due to their short circulation time, side effects, and lack of proper protection from chelation with ions in blood circulation...
December 29, 2016: Biomacromolecules
https://www.readbyqxmd.com/read/27986419/epilepsy-in-the-tropics-emerging-etiologies
#18
Jaime Carrizosa Moog, Angelina Kakooza-Mwesige, Chong Tin Tan
Epilepsy is considered by the World Health Organization a public health priority with more than 50 million human beings affected by the disease. More than 80% of persons with epilepsy live in low and middle income countries and most of them in tropical areas. Several emerging, re-emerging and neglected diseases are symptomatic etiologies that jointly contribute to the enormous global burden of epilepsy. Besides the clinical strengths to reduce diagnostic and treatment gaps, other strategies in social, economic, cultural, educational and health policies are needed to prevent and treat appropriately vulnerable and affected persons with epilepsy...
December 6, 2016: Seizure: the Journal of the British Epilepsy Association
https://www.readbyqxmd.com/read/27981440/visceral-fat-is-associated-with-brain-structure-independent-of-human-immunodeficiency-virus-infection-status
#19
Jordan E Lake, Mikhail Popov, Wendy S Post, Frank J Palella, Ned Sacktor, Eric N Miller, Todd T Brown, James T Becker
The combined effects of human immunodeficiency virus (HIV), obesity, and elevated visceral adipose tissue (VAT) on brain structure are unknown. In a cross-sectional analysis of Multicenter AIDS Cohort Study (MACS) participants, we determined associations between HIV serostatus, adiposity, and brain structure. Men (133 HIV+, 84 HIV-) in the MACS Cardiovascular 2 and magnetic resonance imaging (MRI) sub-studies with CT-quantified VAT and whole brain MRI measured within 1 year were assessed. Voxel-based morphometry analyzed brain volumes...
December 15, 2016: Journal of Neurovirology
https://www.readbyqxmd.com/read/27980287/a-case-of-neurosyphilis-presenting-with-limbic-encephalitis
#20
Kazuto Tsukita, Akihiro Shimotake, Mitsuyoshi Nakatani, Yukitoshi Takahashi, Akio Ikeda, Ryosuke Takahashi
A 46-year-old man presented with a history of personality change and memory disturbance for 5 months. He gradually became difficult in doing a daily job. Brain MRI showed abnormal hyperintensity within bilateral mesial temporal lobes on T2 weighted image. Therefore, viral and autoimmune limbic encephalitis was initially suspected. However, because treponemal and non-treponemal specific antibodies were positive in serum and cerebrospinal fluid (CSF), the diagnosis of neurosyphilis was made. Patients of neurosyphilis with mesiotemporal T2 weighted hyperintensity reportedly showed common features such as relatively young age, HIV-negative, subacute cognitive impairment and seizure, as seen in our patient...
December 16, 2016: Rinshō Shinkeigaku, Clinical Neurology
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