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Biomedical subjects

G Margolis

Publications and source records attributed to G Margolis.

At least 37 records · Page 2Linked to original sources
PubMed1977

Mycoplasma-like structures in granulomatous angiitis of the central nervous system. Case reports with light and electron microscopic studies.

Two patients had granulomatous angiitis of the central nervous system. The typical vasculitis involved the small branches of the cerebral arteries in both patients and resulted in thrombosis of the left middle cerebral artery in one. Electron microscopy demonstrated structures resembling Mycoplasma organisms. These were present in small numbers in the wall and in the granulomatous reaction within the lumen. Giant cells were observed cintaining particles suggestive of Mycoplasma within the perinuclear cisternae. Virus-like particles were not observed.

Adult↗
PubMed1976

Sclerosing spinal pachymeningitis. A complication of intrathecal administration of Depo-Medrol for multiple sclerosis.

Reported complications of intrathecal steroid therapy include aseptic meningitis, infectious meningitis, and arachnoiditis. We report a case of sclerosing spinal pachymeningitis complicating the attempted intrathecal administration of Depo-Medrol for multiple sclerosis. The lesion is characterised by concentric laminar proliferation of neomembranes within the subdural space of the entire spinal cord and cauda equina, resulting from repeated episodes of injury and repair to the spinal dura mater by Depo-Medrol. There is clinical and laboratory evidence that Depo-Medrol produces meningeal irritation and that the vehicle is the necrotising fraction.

Adult↗
PubMed1976

Oxygen tension and the selective tropism of K-virus for mouse pulmonary endothelium.

This study focused on the unique nature of K-virus pneumonitis in suckling mice. This process, rather than being a conventional pneumonitis, is characterized by viral replication and cytopathic effects restricted exclusively to pulmonary endothelium. The selective viral attack on this air-blood interface suggests that K-virus is an endotheliotrope that requires a richly oxygenated intracellular milieu for replication. This possibility has been explored by studies of the course of K-virus infection in suckling mice under conditions of normal (21 per cent), increased (40 per cent), and decreased (10 per cent) 02 content of inspired air. The absence of critical modulating influences of these varied environmental conditions rules out a significant role of tissue 02 concentrations as determinants of the selective tropism of K-virus.

Animals↗
PubMed1976

Hemorrhagic necrosis of the central nervous system. A spontaneous disease of fetal hamsters.

During studies of transplacental virus infections in random bred hamsters purchased with timed pregnancies from three commercial dealers, spontaneous hemorrhagic necrosis of the central nervous system was seen in fetuses harvested near term. Ninety-seven pregnant hamsters from three colonies were examined during a 6-month period; this condition was seen in 25 of 41, 19 of 36, and five of 20 litters. Hamsters from another commercial colony were received, housed, and fed under the same conditions, but remained free of the disease. The pathological process was characterized by multiple spreading zones of edema, malacia, and hemorrhage. Lesions were restricted to neural tissues, including the retina and internal ear. Neuroepithelial proliferation with rosette formation, accompanying the destructive process, constituted a striking reparative response. No inflammatory reaction or cytopathic effects suggestive of virus-induced disease were seen. Studies on the cause of this condition were negative at the time when the disease disappeared spontaneously.

Animals↗
PubMed1975

Induction of congenital hydrocephalus in hamsters with attenuated and natural strains of mumps virus.

The abilities of a low-passage strain and of a live, attenuated vaccine strain of mumps virus to induce congenital hydrocephalus in hamsters were tested by intraamniotic inoculation on the 10th day of pregnancy. Examination of term fetuses and neonates, with cytoplasmic inclusions, cytopathic effects, and specific immunofluorescence used as indicators, demonstrated an oronasal portal of entry for both strains. The vaccine strain appeared to be more pathogenic; it spread primarily into the respiratory tract and hence to the central nervous system. Inclusions were observed as long as 21 days after inoculation. Hydrocephalus and ependymal involvement, potentially capable of producing aqueductal stenosis, were observed in 19 of 81 animals studied 11-29 days after inoculation.

Animals↗
PubMed1975

Encephalitis in suckling rats induced with rat cytomegalovirus.

Encephalitis has been induced in suckling rats by intracerebral inoculation of rat cytomegalovirus. This agent has been carried through five animal passages without changes in virulence. Principal sites of viral attack were the meninges and ependyma with limited parenchymal invasion from these sites. Characteristic features of cytomegalovirus disease observed included cytomegaly, formation of nuclear and cytoplasmic inclusions, and polykaryocytosis. Fundamental tinctorial and optical differences were noted between nuclear and cytoplasmic inclusions, the latter being characterized by their phloxinophilia which contrasts with the hematoxylinophilia of nuclear inclusions. Differential interference microscopy improved visualization and photography of cytoplasmic inclusions. Hydrocephalus developed in a few of the animals and was studied in late phases of the disease.

Animals↗
PubMed1974

Experimental adenovirus infection of the mouse adrenal gland. I. Light microscopic observations.

A murine type of adenovirus has been found to have a highly selective affinity for the adrenal of its natural host. In view of the adrenal pathology in Addison's disease, which consists of cortical atrophy and focal lymphocytic infiltration, the possibility of a viral causation is an attractive hypothesis. The striking adrenotropism of this agent offers, theoretically, a potential experimental animal model for investigation of this possibility. Most of our information about the acute biologic action of adenoviruses has been gained from study of virus-infected tissue culture cells. The sharply focused and severe attack of the murine agent upon a prime target organ facilitates correlative in vivo studies of the cytopathology of adenovirus infection at levels of light and electron microscopy.

Adenoviridae Infections↗
PubMed1974

Experimental adenovirus infection of the mouse adrenal gland. II. Electron microscopic observations.

A strain of mouse adenovirus, found to have a striking tropism for the weanling mouse adrenal gland, enabled electron microscopic examination of adrenals in various stages of infection. Nucleolar hypertrophy and the successive formation of three types of inclusion bodies in association with nucleoli preceded virion production. Angular crystals of virions formed in the affected nuclei. Virus was released by lysis of nuclear membranes; rapid degeneration of cytoplasmic organelles followed. Rupture of external cell membranes released virus into the extracellular spaces where virions crossed vascular basement membranes to enter endothelial cells. Virions were also phagocytized by inflammatory cells which reentered vascular sinusoids, and by adrenal parenchymal cells. Disruption of virus-laden phagocytic vacuoles in parenchymal cells released virions into the cytoplasm. Typical viral inclusion bodies also formed in vascular endothelial cells and in inflammatory cells, but virion replication was not detected. The possibility that virus directly entered parenchymal cells through the external cell membrane without phagocytosis is discussed.

Adenoviridae Infections↗