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Biomedical subjects

C Nogues

Publications and source records attributed to C Nogues.

At least 37 records · Page 2Linked to original sources
PubMed1985

Hypercalcemic infantile renal tumors: morphological, clinical, and biological heterogeneity.

Hypercalcemic infantile renal tumors without bone metastases should be considered to be a heterogeneous tumoral entity. Histological and ultrastructural features, different from those of nephroblastoma, should not be exclusively linked with malignant rhabdoid tumors of the kidney. This is reported by the present case, which appears to be a cellular variant of mesoblastic nephroma and was successfully serially transplanted to nude mice. The causes of hypercalcemia in infantile renal tumors are probably related either to NH2-terminal parathormone or to prostaglandin E2 production by the tumoral cells.

Animals↗
PubMed1985

Hypertension induced by repeated exposure to high sustained +Gz (HS + Gz) stress.

The purpose of this study was to determine whether repeated exposure to high sustained +Gz (HS + Gz) stress induced persistent changes in the functional state of the cardiovascular system. Three groups of rabbits--centrifuged, restrained, and control--were studied. After being placed in the restraining system of the centrifuge, the animals were submitted three times in a row to 8-9 +Gz sustained for 40 s. This exposure was repeated three times a week for 3-6 weeks. Restrained animals were not exposed to HS + Gz. Control animals were not restrained. The two types of stress (centrifuge + restraint; restraint alone) determined the appearance of two types of arterial hypertension. Systolic arterial pressure (AP) and left ventricular pressure (LVP) significantly increased in restrained animals. The function of the cardiovascular system was more perturbed in centrifuged rabbits since the significant changes affected not only systolic AP and LVP but alos systemic diastolic AP and the maximum rate of rise of LVP. The myocardium of rabbits repeatedly subjected to HS + Gz exposures, except for those that suffered a fracture of the lumbar spine, was significantly glycogen-depleted.

Adenosine Diphosphate↗
PubMed1984

Multiorgan aluminium deposits in a chronic haemodialysis patient. Electron microscope and microprobe studies.

The study reports an aluminium-intoxicated haemodialysis patient who had encephalopathy, osteomalacia and congestive cardiomyopathy prior to his death. Detailed light and electron microscope examination revealed the presence of aluminium deposits within lysosomes of cells from many organs, including the kidney, liver, brain and heart. The heavy aluminium deposits in myocardial lysosomes favor a possible role of the trace element in the patient's congestive cardiomyopathy.

Aluminum↗
PubMed1983

Infantile renal tumors associated with hypercalcemia. Characterization of intermediate-filament clusters.

Three cases of hypercalcemic infantile renal tumors were studied to identify the proteins related to their cytoplasmic 8- to 10-nm filament clusters. Immunofluorescence microscopy, using antibodies against vimentin, cytokeratin, and actin, led to the characterization of vimentin-positive filament clusters. We discuss the possibility of a mesenchymal origin for these tumors.

Cytoskeleton↗
PubMed1983

[Recurrent fibroma of the fingers in children: an anatomo-clinical entity].

The authors report 2 cases presenting with juvenile fibromatosis of the fingers. The disease was remarkable for its relapses and the presence of intracytoplasmic eosinophilic inclusions. The cause of this original anatomo-clinical entity is discussed. No argument was found in favor of a viral origin.

Diagnosis, Differential↗
PubMed1982

An original hypercalcemic infantile renal tum or without bone metastasis: heterotransplantation to nude mice: report of two cases.

Two cases of hypercalcemic infantile renal tumor without macroscopic bone metastases are reported. Optical and ultrastructural characteristics as well as biological and clinical data are sufficiently different from those of other infantile renal tumors to justify the individualization of an original tumor entity. The hypercalcemia is not clearly understood but may be related, in one case, with a high N terminal PTH serum level. Ultrastructural elements (secretory granules) and polypeptide hormone products (glucagon) are discussed in relation with APUD cells characteristics.

Animals↗
PubMed1980

Histiocyte X positivity for nonspecific esterase.

The cell membrane and X bodies of histiocytes X from two cases of eosinophilic granuloma were stained by nonspecific esterase. The results show that histiocytes X possess a cell membrane exoenzyme similar to that of other histiocytes, such as alveolar macrophages, but the role of the X body as related to enzyme activity remains an unknown.

Cell Membrane↗
PubMed1980

[Neonatal hernias of the dome of the diaphragm. Why a gloomy prognosis?].

The prognosis is neonatal hernias of the dome of the diaphragm remains extremely gloomy. Associated malformations, prematurity or dysmaturity, cannot explain it. The surgeon is now faced with conditions diagnosed in the labour room, which he previously never saw (and which therefore did not figure in his statistics). Those forms in which the lung gas exchange area is reduced are above all those in which there is a syndrome of persistence of foetal circulation. The association of drugs from the alphalytic group (tolazoline) and curarising agents (pancuronium) is often effective without having completely resolved the problem.

Hernia, Diaphragmatic↗
PubMed1980

Bone remodeling in centrifuged rats: histomorphometric study after an 18-day run.

A histomorphometric and histodynamic study of bone tissue was conducted in rats exposed to 2 G centrifugation for a period of 18 d. Shortening of the femurs was observed, associated with alterations of the growth cartilage in centrifuged animals. The morphometric analysis demonstrates a reduction in bone volume without increase in the activity of osteoclasts. The fluorescent fixation during the dynamic study shows a reduced appositional rate. This result seems to reflect the numerous factors which contribute to the experimental centrifugation test: the osteoporosis is cortisone induced; it is a response to the aggression and probably conceals the remodeling due to higher stress loads.

Animals↗
PubMed1978

Comparative study of lesions in the brain of rats exposed to heavy ions: accelerator and stratospheric flight research.

Irradiations of rat's brain with heavy ionized particles (12/6C, 291 Mev/nucleon, 100 to 300 ions/mm2) have been carried out at the Lawrence Berkeley Laboratory. Exposures were made with slowed ions which stopped within the brain as well as with more energetic particles which passed through. Histological examination of irradiated encephalons by optical microscopy showed zones of glial reaction and an increased number of darkly staining cells. By electron microscopy, intercellular edema, various alterations of nervous cells and macrophagy were observed, especially with stopped ions.

Animals↗
PubMed1976

[Chyloperitoneum causing intestinal obstruction].

The two cases reported here show intestinal obstruction may occur by coagulation of lymph around the loops. They permit us to better understand the physiopathology of blockage of the lymph vessels whether congenital as in the first case or traumatic as in the second case. Traumatic rupture of the cisterns chyli is exceptional. The histological lesions observed on clamped biopsies show clearly the pathology of protein-losing enteropathy.

Adult↗
PubMed1976

Lesional effects of primary cosmic heavy ions on rat brain.

Heavy ions were detected with nuclear emulsions plates fixed on the skulls of 20 rats which were exposed to cosmic rays at an altitude of 32,000 metres. Eight cases are described of correlations between ions tracks and brain lesions. The passage of heavy ions seems to cause functional rather than destructive alterations in the cells. The metabolic disturbances give a dark aspect to the neurons. The lesions generally appear in wide areas around the track and this fact suggests a physiopathological phenomenon of amplification. An evaluation of this biological hazard during flights of long duration at high altitude will be possible when the mechanism of action of heavy ions on nervous tissue is better known, and particularly if experiments carried out in accelerators confirm the small number of results obtained in flight.

Animals↗