Biomedical subjects

M C Pinchon

Publications and source records attributed to M C Pinchon.

23 records · Page 2Linked to original sources

PubMed1980

[Cells of the respiratory system].

The authors review the different cellular types found in the airways, the alveoli and the pleura. They describe in detail the structure and the function of the bronchial mucociliary system and the immunological defense system of the airways. Also discussed, on an alveolar level, are the mechanisms of defense and filtering vis-à-vis air transported pollutants and the role of protease-antiprotease balance in the integrity of interstitial connective tissue.

Bronchi↗

PubMed1980

How pleural mesothelial cells react in vitro with chrysotile fibres.

A culture system of rat pleural mesothelial cells has been developed for short-term experiments and long-term maintenance. In short-term experiments, endocytosis of chrysotile fibres (100 microgram/ml) has been demonstrated by electron microscopy of the pleura in situ. Structural modifications, mainly cytoplasmic vacuolization, were observed when the cells were cultured with sublethal doses of chrysotile (0.5, 1, 2 and 10 micrograms/ml). Untreated cells had a mean population doubling time of 37 hours. When the cells were treated with 2 or 10 micrograms/ml, the mean population doubling time was slightly increased.

Animals↗

PubMed1979

Phagocytosis of chrysotile fibers by pleural mesothelial cells in culture.

Pleural mesothelial cells (PMC) from the parietal pleura of rats were incubated in culture with UICC A chrysotile fibers. The sequence of events in phagocytosis was studied by electron microscopy: phases of attachment sequestration, and degranulation of lysosomal content into the phagocytic vacuole were observed. This demonstrates that PMC can engage in phagocytosis of chrysotile fibers.

Animals↗

PubMed1979

Extrarenal immune complex type deposits induced by mercuric chloride in the Brown Norway rat.

It has been reported previously that HgCl2 chronically injected in the BN rat induced a biphasic renal disease. During the first stage, anti-glomerular basement membrane antibodies appeared and during the second stage, an immune-complex type glomerulonephritis was observed. In the present study, a systemic immune disease is described. During the first stage, antibasement membrane antibodies were observed in various extrarenal structures. Their localization has been found to depend mainly on the characteristics of the endothelium. During the second stage, immune-complex type deposits containing IgG and C3 were found in most vascular structures. Their localization did not apparently depend on the endothelial characteristics. Among the organs tested the lung was most often spared. The occurrence of immune complex deposits was found to depend on the dose of HgCl2 injected: deposits were absent in some high dose HgCl2-injected rats but they were very numerous in low dose HgCl2-injected rats. These deposits probably have a pthogenic role although no major histological lesion could be found. This model may help to explain immune complex type deposits in systemic diseases.

Animals↗

PubMed1976

Immunoelectron microscopic and immunochemical demonstrations of serum proteins in the alveolar lining material of the rat lung.

By means of antibodies labeled with horseradish peroxidase, autologous albumin and IgG were visualized in electron microscopy on the alveolar epithelial surface of the rat lung, as a continuous cell coat, as free granular deposits, or associated with tubular myelin figures. These 2 proteins were detected by immunochemistry in alveolar washing. After ultracentrifugation of alveolar washing, they were still found in the phospholipid-rich precipitate fraction by immunization of rabbits and by immunoelectron microscopy. Thus, albumin and IgG appeared as normal alveolar components in the rat lung; fibrinogen was not found under normal conditions.

Animals↗