scholarly journals An Attenuated Variant of the GDVII Strain of Theiler’s Virus Does Not Persist and Does Not Infect the White Matter of the Central Nervous System

1999 ◽  
Vol 73 (1) ◽  
pp. 801-804 ◽  
Author(s):  
Nadine Jarousse ◽  
Ekaterina G. Viktorova ◽  
Evgeny V. Pilipenko ◽  
Vadim I. Agol ◽  
Michel Brahic
Keyword(s):  
Spinal Cord ◽  
Central Nervous System ◽  
Nervous System ◽  
White Matter ◽  
Gray Matter ◽  
Noncoding Region ◽  
Theiler's Virus ◽  
Recombinant Viruses ◽  
Central Nervous Systems ◽  
The Central Nervous System

ABSTRACT The DA strain of Theiler’s virus causes a persistent and demyelinating infection of the white matter of spinal cord, whereas the GDVII strain causes a fatal gray-matter encephalomyelitis. Studies with recombinant viruses showed that this difference in phenotype is controlled mainly by the capsid. However, conflicting results regarding the existence of determinants of persistence in the capsid of the GDVII strain have been published. Here we show that a GDVII virus whose neurovirulence has been attenuated by an insertion in the 5′ noncoding region does not persist in the central nervous systems of mice. Furthermore, this virus infects the gray matter efficiently, but not the white matter. These results confirm the absence of determinants of persistence in the GDVII capsid. They suggest that the DA capsid controls persistence by allowing the virus to infect cells in the white matter of the spinal cord.

scholarly journals A Neuropathy in Goats Caused by Experimental Coyotillo (Karwinskia humboldtiana) Poisoning

1970 ◽  
Vol 7 (5) ◽  
pp. 435-447 ◽  
Author(s):  
K. M. Charlton ◽  
K. R. Pierce ◽  
R. W. Storts ◽  
C. H. Bridges
Keyword(s):  
Spinal Cord ◽  
Central Nervous System ◽  
Nervous System ◽  
White Matter ◽  
Light Microscopy ◽  
Clinical Signs ◽  
Close Correlation ◽  
Axonal Dystrophy ◽  
The Central Nervous System ◽  
Oral Doses

Twenty-two goats were poisoned with daily oral doses of ground coyotillo fruits and were killed at various times after the first day of dosing. The morphologic features and distribution of lesions in the central nervous system were studied by light microscopy. An axonal dystrophy occurred in several of the goats given high daily doses. Swellings occurred along axons of Purkinje cells in the cerebellum and in the white matter of the spinal cord. There was a fairly close correlation between the occurrence of clinical signs suggestive of the neocerebellar syndrome and the occurrence and distribution of lesions in the cerebellum.

Trichobilharzia regenti, a pathogen of the avian and mammalian central nervous systems

Parasitology ◽  
1999 ◽  
Vol 119 (6) ◽  
pp. 577-581 ◽  
Author(s):  
P. HORÁK ◽  
J. DVOŘÁK ◽  
L. KOLÁŘOVÁ ◽  
L. TREFIL
Keyword(s):  
Spinal Cord ◽  
Central Nervous System ◽  
Nervous System ◽  
Final Host ◽  
Host Factors ◽  
Experimental Animals ◽  
Central Nervous Systems ◽  
Avian Schistosomes ◽  
The Central Nervous System ◽  
Trichobilharzia Regenti

The development of nasal avian schistosomes of the genus Trichobilharzia in their final host is poorly known. Therefore, an experimental infection of ducklings (Anas platyrhynchos f. dom.) by T. regenti was performed. The infection resulted in leg paralysis and orientation/balance disorders of birds. The examination of the duck's spinal cord and brain confirmed the presence of developing parasites in pre-patent as well as patent periods. The absence of the worms in other tissues strongly supports our hypothesis that the parasite migrates through the central nervous system (CNS) to its final location in bird nasal mucosa. The injury level is probably dependent on number of parasites as well as yet unknown host factors. The affinity to the CNS seems to be high; also by exposure of experimental animals to low cercarial doses the growing worms in the CNS were found. In addition to the generally accepted view that bird schistosomes may cause cercarial dermatitis of mammals (including man), there is evidence of a partial development of T. regenti in mouse CNS; in certain cases leg paralysis was also recorded. Therefore, the pathogenesis spectrum caused by bird schistosomes in birds/mammals needs to be reconsidered.

NG2 cells generate oligodendrocytes and gray matter astrocytes in the spinal cord

2008 ◽  
Vol 4 (1) ◽  
pp. 19-26 ◽  
Author(s):  
Xiaoqin Zhu ◽  
Robert A. Hill ◽  
Akiko Nishiyama
Keyword(s):  
Spinal Cord ◽  
Central Nervous System ◽  
Nervous System ◽  
White Matter ◽  
Glial Cell ◽  
Gray Matter ◽  
Ng2 Cells ◽  
Protoplasmic Astrocytes

NG2 cells represent a unique glial cell population that is distributed widely throughout the developing and adult CNS and is distinct from astrocytes, mature oligodendrocytes and microglia. The ability of NG2 cells to differentiate into myelinating oligodendrocytes has been documented in vivo and in vitro. We reported recently that NG2 cells in the forebrain differentiate into myelinating oligodendrocytes but into a subpopulation of protoplasmic astrocytes (Zhu et al., 2008). However, the in vivo fate of NG2 cells in the spinal cord and cerebellum has remained unknown. To investigate the fate of NG2 cells in caudal central nervous system (CNS) regions in vivo, we examined the phenotype of cells that express EGFP in mice that are double transgenic for NG2CreBAC and the Cre reporter Z/EG. The fate of NG2 cells can be studied in these mice by permanent expression of EGFP in cells that have undergone Cre-mediated recombination in NG2 cells. We find that NG2 cells give rise to oligodendrocytes in both gray and white matter of the spinal cord and cerebellum, and to protoplasmic astrocytes in the gray matter of the spinal cord. However, NG2 cells do not give rise to astrocytes in the white matter of the spinal cord and cerebellum. These observations indicate that NG2 cells serve as precursor cells for oligodendrocytes and a subpopulation of protoplasmic astrocytes throughout the rostrocaudal axis of the CNS.

Multiple Sclerosis: White Matter versus Gray Matter Involvement (The Cause of Disability in MS)

2017 ◽  
Author(s):  
Massimo Filippi ◽  
Maria A. Rocca
Keyword(s):  
Magnetic Resonance Imaging ◽  
Multiple Sclerosis ◽  
Central Nervous System ◽  
Nervous System ◽  
White Matter ◽  
Gray Matter ◽  
Resonance Imaging ◽  
Factors Associated ◽  
The Central Nervous System ◽  
Magnetic Resonance Imaging Mri

The classic view of multiple sclerosis (MS) as a chronic, inflammatory-demyelinating condition affecting solely the white matter (WM) of the central nervous system (CNS) has been challenged by the demonstration, from pathologic and magnetic resonance imaging (MRI) studies, of an extensive and diffuse involvement of the gray matter (GM). This observation has driven the application of modern MR technology and methods of analysis to quantify the extent and distribution of damage to the different compartments of the CNS, with the ultimate goal of improving our understanding of the factors associated with the accumulation of clinical disability and cognitive impairment in these patients.

scholarly journals The immune system preferentially clears Theiler's virus from the gray matter of the central nervous system.

1997 ◽  
Vol 71 (11) ◽  
pp. 8592-8601 ◽  
Author(s):  
M K Njenga ◽  
K Asakura ◽  
S F Hunter ◽  
P Wettstein ◽  
L R Pease ◽  
...  
Keyword(s):  
Central Nervous System ◽  
Nervous System ◽  
Immune System ◽  
Gray Matter ◽  
Theiler's Virus ◽  
The Central Nervous System

The relationship between size and vascularity in the spinal cord of developing Xenopus laevis

Development ◽  
1964 ◽  
Vol 12 (3) ◽  
pp. 491-499
Author(s):  
R. T. Sims
Keyword(s):  
Spinal Cord ◽  
Central Nervous System ◽  
Nervous System ◽  
White Matter ◽  
Blood Vessels ◽  
Metabolic Activity ◽  
Grey Matter ◽  
Experimental Conditions ◽  
The Central Nervous System ◽  
The Relationship

Sterzi (1904) studied the blood vessels of the spinal cord in the embryos and adults of a comprehensive series of chordates. He suggested that the formation of new blood vessels in the developing neural tube is controlled by local variations in the metabolic activity of the nerve cells, and that the grey matter of the adult central nervous system is more vascular than the white matter because it is functionally more active. A marked increase in the vascularity of the central nervous system during development has been demonstrated by quantitative observations on rats (Craigie, 1925), guinea-pigs (Petren, 1938), mice (Gyllensten, 1959a), chickens (Williams, 1937) and toads (Sims, 1961). This increase is associated with the maturation of the neurones and no experiments have been performed which separate the production of new blood vessels and the differentiation of these cells. Experimental conditions which prevent the increased vascularity of the mammalian central nervous system during development also prevent differentiation of the neurones.

scholarly journals Encephalitis in the Newborn Pup due to a Canine Herpesvirus

1968 ◽  
Vol 5 (2) ◽  
pp. 135-145 ◽  
Author(s):  
D. H. Percy ◽  
H. J. Olander ◽  
L. E. Carmichael
Keyword(s):  
Central Nervous System ◽  
Nervous System ◽  
White Matter ◽  
Gray Matter ◽  
Experimental Infection ◽  
Natural Infection ◽  
Canine Herpesvirus ◽  
The Central Nervous System ◽  
Histopathologic Findings ◽  
The Brain

A puppy with natural infection, none of 4 puppies examined 18 to 48 hours after experimental infection, and all of 13 puppies examined 3 to 9 days after experimental infection with a canine herpesvirus had lesions of the central nervous system. These constituted a non-suppurative meningoencephalomyelitis, characterized by focal and segmental destruction of gray and white matter and diffuse and focal microgliosis. In general, the gray matter was most severely involved, especially within the brain stem. The histopathologic findings in this disease are comparable to those in other herpetic encephalitides.

Central Nerve System Impairment, AMA Guides, Sixth Edition: An Overview

2018 ◽  
Vol 23 (1) ◽  
pp. 10-13
Author(s):  
James B. Talmage ◽  
Jay Blaisdell
Keyword(s):  
Spinal Cord ◽  
Central Nervous System ◽  
Nervous System ◽  
Neurological Impairment ◽  
Sixth Edition ◽  
Central Nerve System ◽  
The Central Nervous System ◽  
The One ◽  
Nerve System ◽  
The Brain

Abstract Injuries that affect the central nervous system (CNS) can be catastrophic because they involve the brain or spinal cord, and determining the underlying clinical cause of impairment is essential in using the AMA Guides to the Evaluation of Permanent Impairment (AMA Guides), in part because the AMA Guides addresses neurological impairment in several chapters. Unlike the musculoskeletal chapters, Chapter 13, The Central and Peripheral Nervous System, does not use grades, grade modifiers, and a net adjustment formula; rather the chapter uses an approach that is similar to that in prior editions of the AMA Guides. The following steps can be used to perform a CNS rating: 1) evaluate all four major categories of cerebral impairment, and choose the one that is most severe; 2) rate the single most severe cerebral impairment of the four major categories; 3) rate all other impairments that are due to neurogenic problems; and 4) combine the rating of the single most severe category of cerebral impairment with the ratings of all other impairments. Because some neurological dysfunctions are rated elsewhere in the AMA Guides, Sixth Edition, the evaluator may consult Table 13-1 to verify the appropriate chapter to use.

METABOLIC STUDIES WITH 131I-LABELED THYROXINE. II.

1963 ◽  
Vol 44 (3) ◽  
pp. 475-480 ◽  
Author(s):  
R. Grinberg
Keyword(s):  
Spinal Cord ◽  
Central Nervous System ◽  
Nervous System ◽  
Optic Nerve ◽  
Pituitary Gland ◽  
Time Interval ◽  
Time Intervals ◽  
Pituitary Glands ◽  
The Central Nervous System ◽  
Tentative Explanation

ABSTRACT Radiologically thyroidectomized female Swiss mice were injected intraperitoneally with 131I-labeled thyroxine (T4*), and were studied at time intervals of 30 minutes and 4, 28, 48 and 72 hours after injection, 10 mice for each time interval. The organs of the central nervous system and the pituitary glands were chromatographed, and likewise serum from the same animal. The chromatographic studies revealed a compound with the same mobility as 131I-labeled triiodothyronine in the organs of the CNS and in the pituitary gland, but this compound was not present in the serum. In most of the chromatographic studies, the peaks for I, T4 and T3 coincided with those for the standards. In several instances, however, such an exact coincidence was lacking. A tentative explanation for the presence of T3* in the pituitary gland following the injection of T4* is a deiodinating system in the pituitary gland or else the capacity of the pituitary gland to concentrate T3* formed in other organs. The presence of T3* is apparently a characteristic of most of the CNS (brain, midbrain, medulla and spinal cord); but in the case of the optic nerve, the compound is not present under the conditions of this study.

Bioelectrodes for Neural Prostheses

1985 ◽  
Vol 55 ◽  
Author(s):  
F. Terry Hambrecht
Keyword(s):  
Spinal Cord ◽  
Central Nervous System ◽  
Nervous System ◽  
Urinary Bladder ◽  
Cochlear Implants ◽  
Neural Prostheses ◽  
The Future ◽  
Spinal Cord Disorders ◽  
The Central Nervous System ◽  
Auditory Prostheses

ABSTRACTNeural prostheses which are commercially available include cochlear implants for treating certain forms of deafness and urinary bladder evacuation prostheses for individuals with spinal cord disorders. In the future we can anticipate improvements in bioelectrodes and biomaterials which should permit more sophisticated devices such as visual prostheses for the blind and auditory prostheses for the deaf based on microstimulation of the central nervous system.

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