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Biomedical subjects

M B Bornstein

Publications and source records attributed to M B Bornstein.

121 records · Page 7Linked to original sources
PubMed1968

Herpes simplex virus-host cell relationships in organized cultures of mammalian nerve tissues.

Studies on the replication of herpes simplex virus in organized cultures of rat central nervous system (CNS) and peripheral nervous system (PNS) tissue demonstrated synthesis of intra- and extracellular virus, as determined by plaque assay on HEp-2 cells. Newly synthesized intracellular virus appeared 12 to 14 hr after inoculation of CNS, followed 10 hr later by the appearance of extracellular virus. In PNS cultures, where higher inputs of virus were introduced, intracellular virus appeared 6 to 8 hr after inoculation, followed by extracellular virus 12 hr later. Polykaryocyte formation was observed in CNS and PNS tissue involving neuroglial, meningeal, or Schwann cells. Neuron somas did not participate in polykaryocyte formation, but they underwent progressive morphological changes starting with increased cytoplasmic granularity followed by nucleolar distortions and disintegration, margination of nuclear chromatin, and the appearance of intranuclear inclusions. Finally, all recognizable cellular detail was lost. Immune serum globulin failed to inhibit both the progressive nature of the cytopathic effect and the synthesis of intracellular virus. These findings are discussed in relation to other in vitro systems, as well as to disease processes in man and animals.

Animals↗
PubMedDate not supplied

Chemical neurotoxicity: detection and analysis in organotypic cultures of sensory and motor systems.

Screening of chemical substances for human neurotoxic (and therapeutic) properties may be carried out with the aid of organotypic tissue cultures composed of foetal explants of mouse sensory and neuromuscular tissues that develop in vitro their characteristic cytoarchitectural and functional organization. Supporting this statement is a wealth of studies describing a range of specific, chemically-induced responses in organotypic neural cultures that parallel changes induced in the nervous system of humans and animals.

Culture Techniques↗
PubMedDate not supplied

Further ultrastructural observations of virus morphogenesis and myelin pathology in JHM virus encephalomyelitis.

Groups of 3, 17, and 28-day-old Swiss mice were inoculated intracerebrally with JHM virus, the neurotropic strain of mouse hepatitis virus (MHV), and studied serially by virologic and morphologic techniques. Beginning 2--5 days post-inoculation, all groups of infected mice developed CNS lesions which were destructive in the 3-day-old group and demyelinative in the 17 and 28-day-old animals. Infectious virus could be isolated from the brain, spinal cord, and liver. Electron microscopy demonstrated the virus to be pantropic in the CNS with virions occurring within ependymal cells, astrocytes, neurons, oligodendrocytes, endothelial cells, and cell of haematogenous origin. Giant cell formation was a constant feature. In regions of demyelination, oligodendrocytes exhibited a propensity to proliferative aberrant membrane. Myelin degradation was accompanied by membrane vesiculation and by the stripping action of macrophages. The lesions were not due to CNS elements in the inoculum since in animals inoculated with normal CNS suspensions from appropriate age groups failed to show lesions. The morphogenesis of JHM virions was followed ultrastructurally as was the formation of syncytia in the different cell types. In addition to delineating virus morphogenesis and myelin pathology, the results underscore the pantropic nature of JHM virus in the CNS, the synstemic nature of the infection, and that oligodendrocytes were the principal targets.

Aging↗
PubMedDate not supplied

The organization of astrocytes in organotypic mouse spinal cord culture: an electron microscope study.

The organization of astrocytes in myelinated culture of mouse spinal cord tissue was analysed ultrastructurally and compared with the pattern in vivo. Astrocyte cell bodies and their processes, connected by punctate adhesions and gap junctions, formed a continuous layer around the entire explant. Throughout the parenchyma, thin astrocytic processes penetrated the neuropil, separated neurons, and invested some synaptic complexes. Others formed flattened sheets and contacted directly with the basal surface of ependymal cells. In the absence of mesenchymal elements, astrocytes in vitro occasionally possessed fragments of basal lamina on the surface of the explant and around minute intercellular spaces. Except for an incomplete basal lamina, these findings indicate that astrocytes in vitro are organized in a manner essentially identical to the situation in vivo.

Animals↗