摘要:

Studies of pleural clearance of calcium tungstate particles were made in the dog. By using scanning electron microscopy and elemental microanalysis, we show that mesothelial cells of the visceral leaflet of the pleura are also involved in the clearance of particles present in the pleural space. The histological study of lu g parenchyma shows many macrophages loaded with tungsten particles, and we conclude that this way may be an important pathway for the transmission of pathologic processes from the pleural space to the lung.

ISSN:1422-6405    

DOI:10.1159/000147400

出版商:S. Karger AG    

年代:1992

数据来源: Karger

摘要:

The lining epithelium of secretory end pieces and central glandular duct in the seminal vesicle of the water buffalo (Bubalus bubalis) consists of columnar principal and small polymorphous basal cells. A system of intercellular and even intracellular canaliculi enlarges the secretory surface. The most prominent organelle of the columnar principal cells is the granular endoplasmic reticulum forming large aggregates of parallel lamellae. Using antibodies against the neural cell adhesion molecule L1 and the neural marker protein gene product 9.5 (PGP 9.5), the innervation pattern of the seminal vesicle becomes evident. The muscular layer surrounding the propria contains a dense network of unmyelin-ated fibers. Thicker bundles traverse the muscular layer to reach the propria. Around glandular secretory tubules and below the epithelial lining of the glandular duct a tightly woven subepithelial plexus is observed which sends short penetrating branches into the basal zone of the epithelium. These intraepithelial nerves are devoid of Schwann cells and basal lamina (naked axons) and are situated within the intercellular spaces between principal and basal cells. Acetylcholinesterase histochemistry with short (1–2 h) incubation times, dopamine-β-hydroxylase immunohistochemistry and ultrastructural study of transmitter-containing vesicles was performed. The results suggest that muscular contraction in the seminal vesicle is predominantly under the influence of the sympathetic nervous system, whereas secretory epithelial function is regulated by both sympa thetic and parasympathetic fibe

ISSN:1422-6405    

DOI:10.1159/000147401

出版商:S. Karger AG    

年代:1992

数据来源: Karger

摘要:

We have studied the ultrastructure of the pinealocyte after 24 h of immobilization. Thirty male albino rats (230 ± 10 g) were used; the animals were divided into two groups of 15 each. One group was immobilized for 24 h (10.00 h a.m. to 10.00 h a.m.), whereas the other group was used as control. All animals were sacrificed between 10.00 and 14.00 h of the following day. Ultrastructural observations showed an euchromatinic nucleus with numerous giant ‘lipid droplets’ as well as abundant long ‘synaptic ribbons’ that were significantly more abundant than in the controls (p < 0.0005). These findings all suggest an increase in pineal activity following 24-hour immobi

ISSN:1422-6405    

DOI:10.1159/000147402

出版商:S. Karger AG    

年代:1992

数据来源: Karger

摘要:

The carbohydrate epitope 3-fucosyl-N-acetyllactosamine (CD 15) is involved in cell-to-cell recognition processes in various tissues. In the present study the sub-cellular localization of CD15 was immunocytochemically studied in normal and pathological central nervous system fiber tracts of humans and rats. In normal human white matter of the brain, CD 15 immunoreactivity was found on the cell surface of astrocytes and within the cytoplasm of oligodendrocytes. In freshly demyelinated lesions of two human diseases (central pontine myelinolysis a d multiple sclerosis) strong cytoplasmic CD 15 staining was observed in reactive astrocytes. In normal rats CD15 immunostaining was restricted to the surface of astrocytes. In crush-induced lesions of rat optic nerves, however, astrocytes showed a cytoplasmic localization of CD15, 4 and 6 days after injury. In conclusion, abnormal localization of CD 15 in reactive astrocytes may be related to altered functional states of these cells during disease processes.

ISSN:1422-6405    

DOI:10.1159/000147403

出版商:S. Karger AG    

年代:1992

数据来源: Karger

ISSN:1422-6405    

DOI:10.1159/000147404

出版商:S. Karger AG    

年代:1992

数据来源: Karger

ISSN:1422-6405    

DOI:10.1159/000147405

出版商:S. Karger AG    

年代:1992

数据来源: Karger

ISSN:1422-6405    

DOI:10.1159/000147406

出版商:S. Karger AG    

年代:1992

数据来源: Karger

ISSN:1422-6405    

DOI:10.1159/000147379

出版商:S. Karger AG    

年代:1992

数据来源: Karger