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https://www.readbyqxmd.com/read/29161640/aging-schwann-cells-mechanisms-implications-future-directions
#1
REVIEW
Michio Wendell Painter
The aging peripheral nervous system (PNS) is prone to a number of disorders, including the development of neuropathies and increased regenerative failure. Although the basic mechanisms of the aging PNS are still rather murky, recent work has revealed that 'old' Schwann cells acquire a number of dysfunctions in mammals. This review will assess our current knowledge about aging Schwann cells while emphasizing where gaps exist. Indeed, as our understanding of how these peripheral glia contribute to the development, maintenance and regeneration of the PNS becomes increasingly refined, we should also turn our attention to questions of escalating importance in our rapidly greying society: how do Schwann cells change with aging, how might these changes contribute to dysfunction and disease, and what, if anything, might this tell us about the aging central nervous system?...
November 18, 2017: Current Opinion in Neurobiology
https://www.readbyqxmd.com/read/29161320/in-vivo-effects-of-intraocular-and-intracranial-pressures-on-the-lamina-cribrosa-microstructure
#2
Bo Wang, Huong Tran, Matthew A Smith, Tigran Kostanyan, Samantha E Schmitt, Richard A Bilonick, Ning-Jiun Jan, Larry Kagemann, Elizabeth C Tyler-Kabara, Hiroshi Ishikawa, Joel S Schuman, Ian A Sigal, Gadi Wollstein
There is increasing clinical evidence that the eye is not only affected by intraocular pressure (IOP), but also by intracranial pressure (ICP). Both pressures meet at the optic nerve head of the eye, specifically the lamina cribrosa (LC). The LC is a collagenous meshwork through which all retinal ganglion cell axons pass on their way to the brain. Distortion of the LC causes a biological cascade leading to neuropathy and impaired vision in situations such as glaucoma and idiopathic intracranial hypertension...
2017: PloS One
https://www.readbyqxmd.com/read/29159909/essential-role-of-brain-derived-neurotrophic-factor-bdnf-in-diabetic-erectile-dysfunction
#3
L Hu, S Qi, K Zhang, Q Fu
Erectile dysfunction (ED) is a worldwide problem threatens men's health. The incidence of ED in diabetic patients is higher than that in the healthy population. The incidence of peripheral and autonomic neuropathy is significantly higher in diabetic patients than in normal men. Vasomotor nerves play an important role in the regulation of erectile function. Degeneration of autonomic and sensory nerves is a common type of diabetic neuropathy (DNP) and is closely related to erectile function. Brain-derived neurotrophic factor (BDNF) has been demonstrated to improve diabetic erectile dysfunction in rat models and in humans...
November 21, 2017: Andrologia
https://www.readbyqxmd.com/read/29159899/extremely-painful-multifocal-acquired-predominant-axonal-sensorimotor-neuropathy-of-the-upper-limb
#4
Doris Lieba-Samal, Jeroen J J van Eijk, Marieke H J van Rosmalen, Irene M F van Balken, Aad Verrips, Jop Mostert, Sigrid Pillen, Nens van Alfen
The differential diagnosis of upper extremity mononeuritis multiplex includes neuralgic amyotrophy, vasculitic neuropathy, and Lewis-Sumner syndrome. We describe 3 patients initially suspected of neuralgic amyotrophy, who had an extremely painful, protracted, progressive disease course, not fitting one of these established diagnoses. Nerve ultrasonography showed focal caliber changes of the roots, plexus, and limb nerves. Electromyography showed predominant multifocal axonopathy. Ongoing autoimmune neuropathy was suspected...
November 21, 2017: Journal of Ultrasound in Medicine: Official Journal of the American Institute of Ultrasound in Medicine
https://www.readbyqxmd.com/read/29159795/impact-of-chemotherapy-induced-neurotoxicities-on-adult-cancer-survivors-symptom-burden-and-quality-of-life
#5
Christine Miaskowski, Judy Mastick, Steven M Paul, Gary Abrams, Steven Cheung, Jennifer Henderson Sabes, Kord M Kober, Mark Schumacher, Yvette P Conley, Kimberly Topp, Betty Smoot, Grace Mausisa, Melissa Mazor, Margaret Wallhagen, Jon D Levine
PURPOSE: Limited information is available on the impact of chemotherapy (CTX)-induced neurotoxicity on adult survivors' symptom experience and quality of life (QOL). Purposes were to describe occurrence of hearing loss and tinnitus and evaluate for differences in phenotypic characteristics and measures of sensation, balance, perceived stress, symptom burden, and QOL between survivors who received neurotoxic CTX and did (i.e., neurotoxicity group) and did not (i.e., no neurotoxicity group) develop neurotoxicity...
November 20, 2017: Journal of Cancer Survivorship: Research and Practice
https://www.readbyqxmd.com/read/29159712/effect-of-kaempferol-isolated-from-seeds-of-eruca-sativa-on-changes-of-pain-sensitivity-in-streptozotocin-induced-diabetic-neuropathy
#6
Lalit Kishore, Navpreet Kaur, Randhir Singh
Generation of excessive reactive oxygen species (ROS) and advanced glycation end products (AGEs), and cellular apoptosis are implicated in the pathogenesis of diabetic neuropathy. Present study was aimed to explore the effect of Eruca sativa and Kaempferol (KP) on hyperalgesia (thermal and mechanical); tactile allodynia, motor nerve conduction velocity (MNCV) and oxidative-nitrosative stress in streptozotocin (STZ) induced experimental diabetes. Neuropathy developed in diabetic rats was evident from a marked hyperalgesia and allodynia; reduced MNCV associated with excess formation of AGEs and ROS...
November 20, 2017: Inflammopharmacology
https://www.readbyqxmd.com/read/29159464/anti-mag-associated-cerebellar-ataxia-and-response-to-rituximab
#7
Panagiotis Zis, Dasappaiah Ganesh Rao, Nigel Hoggard, Ptolemaios Georgios Sarrigiannis, Marios Hadjivassiliou
BACKGROUND: Myelin-associated glycoprotein (MAG) is a glycoprotein specific to Schwann cells. Schwann cells produce myelin for nerve cells in the peripheral nervous system. MAG also plays a role in the central nervous system (CNS) by maintaining myelin integrity and inhibiting axonal regeneration from cerebellar neurons. There is a well-established link between distal demyelinating neuropathy and anti-MAG antibodies in patients with monoclonal gammopathy of unknown significance. We describe a series of five patients with anti-MAG antibodies with evidence of cerebellar rather than just sensory ataxia and our experience of treatment with rituximab...
November 20, 2017: Journal of Neurology
https://www.readbyqxmd.com/read/29159194/multigeneration-family-with-dominant-spg30-hereditary-spastic-paraplegia
#8
Ricardo H Roda, Alice B Schindler, Craig Blackstone
Autosomal recessive KIF1A missense mutations cause hereditary spastic paraplegia (HSP) type SPG30, while recessive truncations lead to sensory and autonomic neuropathy (HSN2C) and many de novo missense mutations are associated with cognitive impairment. Here, we describe family members across three generations with pure HSP. A heterozygous p.Ser69Leu KIF1A mutation segregates with those afflicted. The same variant was previously reported in a Finnish father and son with pure HSP as well as four members of a Sicilian kindred with more intrafamilial phenotypic variability...
November 2017: Annals of Clinical and Translational Neurology
https://www.readbyqxmd.com/read/29159152/cranial-nerve-palsy-after-onyx-embolization-as-a-treatment-for-cerebral-vascular-malformation
#9
Jong Min Lee, Kum Whang, Sung Min Cho, Jong Yeon Kim, Ji Woong Oh, Youn Moo Koo, Chul Hu, Jinsoo Pyen, Jong Wook Choi
The Onyx liquid embolic system is a relatively safe and commonly used treatment for vascular malformations, such as arteriovenous fistulas and arteriovenous malformations. However, studies on possible complications after Onyx embolization in patients with vascular malformations are limited, and the occurrence of cranial nerve palsy is occasionally reported. Here we report the progress of two different types of cranial nerve palsy that can occur after embolization. In both cases, Onyx embolization was performed to treat vascular malformations and ipsilateral oculomotor and facial nerve palsies were observed...
September 2017: Journal of Cerebrovascular and Endovascular Neurosurgery
https://www.readbyqxmd.com/read/29158911/a-retrospective-evaluation-of-activity-of-gemcitabine-platinum-regimens-in-the-treatment-of-recurrent-ovarian-cancer
#10
Tran N Le, Rachel E Harvey, Christine K Kim, Jubilee Brown, Robert L Coleman, Judith A Smith
Background: While many of these agents have been compared in prospective clinical trials, the gemcitabine/platinumbased regimens have not been compared in a prospective, randomized clinical trial. While bothgemcitabine/carboplatin and gemcitabine/cisplatin have a similar ORR in separate clinical trials, the tworegimens have never been directly been compared. With overlapping dose-limiting toxicity of thrombocytopenia, the gemcitabine/carboplatin regimen has been challenging to employ in the clinical setting in previously treated ovarian cancer patients and is often associated with treatment delays and/or dose reductions...
2017: Gynecologic Oncology Research and Practice
https://www.readbyqxmd.com/read/29157803/iridoid-glycosides-fraction-from-picrorhiza-kurroa-attenuates-cyclophosphamide-induced-renal-toxicity-and-peripheral-neuropathy-via-ppar-%C3%AE-mediated-inhibition-of-inflammation-and-apoptosis
#11
Supriya Sharma, Pallavi Sharma, Pankaj Kulurkar, Damanpreet Singh, Dinesh Kumar, Vikram Patial
BACKGROUND: Picrorhiza kurroa Royle (Scrophulariaceae) is an important medicinal herb being widely used in variety of ailments. PURPOSE: The present study was envisaged to evaluate the effects of iridoid glycosides enriched fraction (IGs) from Picrorhiza kurroa rhizome against cyclophosphamide (CP) -induced renal toxicity and peripheral neuropathy. METHODS: Mice in different groups were pretreated with 25, 50 and 100 mg/kg; p.o. doses of IGs for 21 days, followed by cyclophosphamide intoxication for consecutive two days...
December 1, 2017: Phytomedicine: International Journal of Phytotherapy and Phytopharmacology
https://www.readbyqxmd.com/read/29157770/the-prevention-and-recognition-of-ulnar-nerve-and-brachial-plexus-injuries
#12
Barbara J Duffy, Tito D Tubog
Perioperative peripheral nerve injury is a serious yet preventable perioperative complication. Since the inception of the American Association of Anesthesiologists Closed Claim Project, the incidence of peripheral nerve injury has remained constant with an overall reported prevalence rate of 15% to 16%. To date, the most frequent nerve injuries are ulnar nerve neuropathy and brachial plexus injury. This article will review the clinical presentation, pathophysiology, causative and risks factors, and preventive measures for the two most common nerve injuries...
December 2017: Journal of Perianesthesia Nursing: Official Journal of the American Society of PeriAnesthesia Nurses
https://www.readbyqxmd.com/read/29157616/the-peripheral-neuropathies-of-poems-syndrome-and-castleman-disease
#13
REVIEW
Michelle L Mauermann
Polyneuropathy, organomegaly, endocrinopathy, monoclonal plasma cell disorder, skin changes (POEMS) syndrome is a rare paraneoplastic disorder. The polyneuropathy can be the presenting symptom and is typically a painful, motor-predominant polyradiculoneuropathy often mimicking chronic inflammatory demyelinating polyradiculoneuropathy. The presence of a lambda monoclonal protein, elevated vascular endothelial growth factor, systemic features, and treatment resistance are clues to the diagnosis. Castleman disease (CD) is seen in a subset of these patients, and when present the neuropathy is similar but less severe...
February 2018: Hematology/oncology Clinics of North America
https://www.readbyqxmd.com/read/29157614/poems-syndrome-diagnosis-and-investigative-work-up
#14
REVIEW
Angela Dispenzieri, Taxiarchis Kourelis, Francis Buadi
POEMS syndrome is a rare paraneoplastic syndrome secondary to a plasma cell dyscrasia. Recognition of a combination of peripheral neuropathy, organomegaly, endocrinopathy, monoclonal plasmaproliferative disorder, skin changes, papilledema, extravascular volume overload, sclerotic bone lesions, thrombocytosis, and Castleman disease is the first step in managing the disease. Increased blood levels of vascular endothelial growth factor are usually confirmatory. This rare disorder should not be missed, especially if the patient has a putative diagnosis of chronic inflammatory polyradiculoneuropathy, a lambda restricted monoclonal gammopathy, and thrombocytosis, and is not responding as expected to immunomodulatory therapy commonly used for chronic inflammatory polyradiculoneuropathy...
February 2018: Hematology/oncology Clinics of North America
https://www.readbyqxmd.com/read/29157168/burkitt-non-hodgkin-lymphoma-presenting-with-mental-neuropathy-numb-chin-syndrome-in-an-hiv-positive-patient
#15
N Vora, H Haryee, J C Dickson, R F Miller
Mental nerve neuropathy is usually due to local trauma or dental causes, but may be a manifestation of malignancy. A patient with virologically controlled human immunodeficiency virus (HIV) infection presented with a 'numb chin' on the background of long-standing night sweats, malaise and weight loss, worsening respiratory symptoms, and lymphadenopathy. Burkitt non-Hodgkin lymphoma was diagnosed from histology of a lymph node. Imaging (magnetic resonance imaging and (18)fluorodeoxyglucose [FDG]-positron emission tomography-computed tomography [PET-CT]) showed abnormal intracranial enhancement of the right mandibular nerve and extensive (18)FDG-avid lymphadenopathy above and below the diaphragm, focal lesions in the spleen and within the right mandible...
January 1, 2017: International Journal of STD & AIDS
https://www.readbyqxmd.com/read/29156847/longitudinal-relationship-between-traumatic-brain-injury-and-the-risk-of-incident-optic-neuropathy-a-10-year-follow-up-nationally-representative-taiwan-survey
#16
Ying-Jen Chen, Chang-Min Liang, Ming-Cheng Tai, Yun-Hsiang Chang, Tzu-Yu Lin, Chi-Hsiang Chung, Fu-Huang Lin, Chang-Huei Tsao, Wu-Chien Chien
Accumulating evidences had shown that traumatic brain injury was associated with visual impairment or vision loss. However, there were a limited number of empirical studies regarding the longitudinal relationship between traumatic brain injury and incident optic neuropathy. We studied a cohort from the Taiwanese National Health Insurance data comprising 553918 participants with traumatic brain injury and optic neuropathy-free in the case group and 1107836 individuals without traumatic brain injury in the control group from 1st January 2000...
October 17, 2017: Oncotarget
https://www.readbyqxmd.com/read/29155769/a-simple-approach-to-induce-experimental-autoimmune-neuritis-in-c57bl-6-mice-for-functional-and-neuropathological-assessments
#17
David G Gonsalvez, Jessica L Fletcher, Sang Won Yoo, Rhiannon J Wood, Simon S Murray, Junhua Xiao
Experimental autoimmune neuritis (EAN) is a well-appreciated experimental model of autoimmune peripheral demyelinating diseases. EAN disease is induced by immunizing mice with neurogenic peptides to direct an inflammatory attack toward components of the peripheral nervous system (PNS). Recent advances have enabled the induction of EAN in the relatively resistant C57BL/6 mouse line using myelin protein zero (P0)106-125 or P0180-199 peptides delivered in adjuvant combined with the injection of pertussis toxin...
November 9, 2017: Journal of Visualized Experiments: JoVE
https://www.readbyqxmd.com/read/29155701/an-ultrasonic-tool-for-nerve-conduction-block-in-diabetic-rat-models
#18
Yee Fun Lee, Chou-Ching Lin, Jung-Sung Cheng, Gin-Shin Chen
Nerve conduction block with a high intensity-focused ultrasound (HIFU) transducer has been performed in normal and diabetic animal models recently. HIFU can reversibly block the conduction of peripheral nerves without damaging the nerves while using an appropriate ultrasonic parameter. Temporary and partial block of the action potentials of nerves shows that HIFU has the potential to be a useful clinical treatment for pain relief. This work demonstrates the procedures for suppressing the action potentials of neuropathic nerves in diabetic rats in vivo using an HIFU transducer...
October 20, 2017: Journal of Visualized Experiments: JoVE
https://www.readbyqxmd.com/read/29155576/chronic-arsenic-exposure-increases-a%C3%AE-1-42-production-and-rage-expression-in-rat-brain
#19
Sandra Aurora Niño, Guadalupe Martel-Gallegos, Adriana Castro-Zavala, Benita Ortega-Berlanga, Juan Manuel Delgado, Hector Hernandez-Mendoza, E Romero-Guzman, Judith Rios-Lugo, Sergio Rosales-Mendoza, María Esther Jiménez-Capdeville, Sergio Zarazua
Chronic arsenic exposure during development is associated with alterations of chemical transmission and demyelination, which result in cognitive deficits and peripheral neuropathies. At cellular level, arsenic toxicity involves increased generation of reactive species that induce severe cellular alterations such as DNA fragmentation, apoptosis and lipid peroxidation. It has been proposed that arsenic-associated neurodegeneration could evolve to Alzheimer disease in later life.1,2 In this study, the effects of chronic exposure to inorganic arsenic (3 ppm by drinking water) in Wistar rats on the production and elimination of Amyloid-β (Aβ) were evaluated...
November 20, 2017: Chemical Research in Toxicology
https://www.readbyqxmd.com/read/29154979/small-fiber-neuropathy-diagnosis-causes-and-treatment
#20
Damien Sène
Small fiber neuropathy, which affects the sensory A≏ and C fibers, is now a major diagnostic and therapeutic challenge. Nearly 7% of the general population have chronic neuropathic pain responsible for severe quality-of-life impairments. Awareness must therefore be raised among clinicians of the somatosensory and autonomic symptoms that can reveal small fiber neuropathy, appropriate diagnostic investigations, most common causes, and best treatment options for each patient profile. To help achieve this goal, the present review article discusses the clinical presentation of neuropathic pain and paresthesia and/or autonomic dysfunction due to involvement of nerves supplying exocrine glands and smooth muscle; normal findings from standard electrophysiological investigations; most informative diagnostic tests (epidermal nerve fiber density in a skin biopsy, laser-evoked potentials, heat- and cold-detection thresholds, electrochemical skin conductance); main causes, which consist chiefly of metabolic diseases (diabetes mellitus, glucose intolerance), dysimmunity syndromes (Sjögren's syndrome, sarcoidosis, monoclonal gammopathy), and genetic abnormalities (familial amyloidosis due to a transthyretin mutation, Fabry disease, sodium channel diseases); and the available symptomatic and etiological treatments...
November 15, 2017: Joint, Bone, Spine: Revue du Rhumatisme
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