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Biomedical subjects

M Reznik

Publications and source records attributed to M Reznik.

At least 73 records · Page 4Linked to original sources
PubMed1985

Substance P, enkephalins, somatostatin, cholecystokinin, oxytocin, and vasopressin in human spinal cord.

Several neuropeptides were immunohistologically studied in normal human spinal cords. Substance P, methionine-enkephalin, leucine-enkephalin, and cholecystokinin positive fibers were found in all cytoarchitectonic layers, with a specific distribution pattern for each peptide. Somatostatin, oxytocin, and vasopressin immunoreactivities were restricted to particular spinal layers. Perikarya and proximal dendrites were visualized and classified by comparison with previous Golgi analyses. Substance P was contained in "radiate cells" of layer III, methionine-enkephalin in marginal neurons as well as in layer II "stellate cells," and somatostatin in layer II "islet cells." Several results differed from those reported in other species. Chemical neuroanatomy may provide new insights into the neuronal organization of the human spinal cord.

Adult↗
PubMed1985

[Immunocytochemical study of the spinal distribution of substance P, enkephalins, cholecystokinin and serotonin in amyotrophic lateral sclerosis].

Using immunocytochemical methods, a severe loss of substance P, but not of enkephalin, cholecystokinin and serotonin containing fibers was observed in lamina IX of the spinal cords from 4 amyotrophic lateral sclerosis cases. Substance P-fibers were decreased before degeneration of motoneurons. They were normal in the remaining spinal gray matter.

Amyotrophic Lateral Sclerosis↗
PubMed1985

[Ultrastructural localization of pituitary hormones by immunocytochemical reactions in ultrathin sections of adenomas].

Human pituitary adenomas were fixed in glutaraldehyde and embedded in epon. Ultrathin sections were incubated either with anti-hGH, anti-hPRL or anti-hLH. They were incubated with second step goat anti-rabbit immunoglobulins linked to gold particles. Two PRL secreting adenomas, one GH and PRL secreting adenoma, one ACTH secreting adenoma and two non secreting adenomas were studied. The specificity and the limits of the method were discussed in relation with the results obtained in light microscopy with the PAP method.

Adenoma↗
PubMed1983

Lhermitte-Duclos disease.

A new case of Lhermitte-Duclos disease (dysplastic gangliocytoma of the cerebellum) was recognized in an adult man after neurosurgery. Conventional, Golgi, and electron-microscopic investigations support the view that this rare lesion results from a progressive hypertrophy of granular cell neurons with excess of myelination of their axons in the molecular layer while inducing the local disappearance of Purkinje cells and the central core of the cerebellar folia. After a follow-up of 4 years, the patient now leads a normal life; no recurrence has occurred and no other neuropathologic alteration have been detected.

Adult↗
PubMed1983

Neuropathology in seven cases of locked-in syndrome.

The neuropathology of 7 cases of the locked-in syndrome has been reviewed and compared with 3 cases of akinetic mutism, all of them occurring after brainstem vascular disease (9 infarctions, 1 hematoma). Including other published cases of verified locked-in syndrome, the extent of lesions has been studied in order to understand, among other symptoms, the preservation of consciousness, voluntary eye movements, auditory comprehension and vital functions. It is concluded that, at the time of autopsy, although most of the clinical signs can be explained by the pathological findings, it is not yet possible to individualize specific brainstem lesions responsible for this syndrome.

Aged↗
PubMed1982

[Immunohistochemical study in 16 cases of primary lymphoma of the central nervous system (author's transl)].

Sixteen primary lymphomas of the central nervous system (CNS) have been studied with an immunoperoxidase technique (PAP) for the demonstration of intracytoplasmic immunoglobulins. The material was obtained by biopsy (10 cases) and at autopsy (6 cases). For comparison, ten other tumors (glial tumors and secondary lymphomas involving the nervous tissue) were simultaneously investigated. In the 16 primary lymphomas, 14 contained intracellular immunoglobulins that were considered "monoclonal" in 9 cases, "probably monoclonal" in 4 cases but "uninterpretable" in the last one. According to the Kiel classification, the 13 malignant lymphomas with intracellular immunoglobulins were classified, morphologically, as immunoblastic sarcomas (9 cases) or immunocytomas (4 cases). No immunoglobulins were detected in 2 cases: 1 lymphoblastic lymphoma and 1 centrocytic lymphoma. Various amounts of intracytoplasmic immunoglobulins were detected in inflammatory cells and glial cells (either reactive or tumoral) but the pattern of staining was consistent with current concepts of polyclonality. Therefore, a diagnosis based on the Kiel classification of lymphomas and the PAP technique will allow a more accurate prognosis on the evolution of primary lymphomas of the CNS with aspect of "high grade" and "low grade" malignancy.

Adolescent↗
PubMed1981

Two cases of progressive multifocal leukoencephalopathy after renal transplantation.

Progressive multifocal leukoencephalopathy (PML) occurred in two patients after kidney transplantation. Less than 2 years after such a transplantation associated with immunosuppressive chemotherapy a 54-year-old male developed polyneuropathy then clinical diffuse alteration of the central nervous system. He died three months later with the suspicion of hypertensive encephalopathy due to progressive renal failure. A 45-year-old female had a kidney transplantation first rapidly complicated by Listeria monocytogenes meningoencephalitis. She was cured from this disease and had a satisfactory social rehabilitation during two years. Afterwards, she suffered various neurological troubles, including epilepsy, that were attributed to combined renal failure and developing hydrocephalus. One year after the onset of these neurological symptoms, the grafted kidney was removed and chemotherapy was discontinued. She died three months later. Both patients had typical PML with eosinophilic intranuclear inclusions in presumptive oligodendroglial cells. By electron microscopy, performed on formalin fixed brain tissue, round particles (40-50 nm) could be recognized in some glial cell nuclei. These two cases are confronted with the four published observations of PML following organ transplantation.

Astrocytes↗
PubMed1980

Comparison of the sarcoplasmic and myofibrillar proteins of twitch and tonic fibres of frog muscle (Rana esculenta).

Sarcoplasmic and myofibrillar proteins of a frog mixed muscle (distal cruralis bundle) were investigated and compared to their fast twitch muscle homologues. Histochemical reactions revealed two populations of fibres in this muscle, differing from fast twitch fibres by the intensity of their myofibrillar ATPase reaction and by their mitochondrial NADH dehydrogenase activity. The distribution of parvalbumins and LDH isoenzymes in the whole muscle showed some features of tonic muscle type. Myosin light chains pattern of cruralis bundle fibres was characterized by the lower proportion of the LC3 subunit. These results confirmed the heterogeneity of this frog muscle and the presence of tonic or intermediate fibres with their typical sarcoplasmic and myofibrillar proteinic composition.

Adenosine Triphosphatases↗
PubMed1979

Acute ascending poliomyelomalacia after treatment of acute lymphocytic leukemia.

This paper reports the case of a 16-year-old girl with acute lymphoblastic leukemia who received chemotherapy including intrathecal injections of methotrexate and preventive irradiation of the brain, but not of the spinal cord. Several months later, she died from an acute ascending poliomyelitic syndrome evolving during 10 days. Clinical, bacteriological, and viral investigations failed to demonstrate any pathological agent. Autopsy revealed an acute ischemic lesion involving both anterior horns of the whole spinal cord and extending from the lower segment up to the mesencephalic region, without significant alteration of the white matter. Neither tumoral invasion, nor vascular obstruction was found. The pathogenesis of this yet undescribed lesion remained unclear but a metabolic disorder seemed the most plausible pathological factor.

Adolescent↗