The role of clathrin-coated vesicles in acrosome formation

Ultrastructural and cytochemical observations are presented which suggest that coated vesicles originating from the trans (distal) aspect of the rat spermatid Golgi apparatus transport lysosomal enzymes from the Golgi to the developing acrosome. Using an affinity purified antibody against the clathrin coats of pig brain coated vesicles, immunofluorescence and immuno-electron microscopic studies were carried out on frozen sections of rat seminiferous tubules. The results showed a specific labelling of the Golgi-acrosome region which corresponded precisely with the location of the coated vesicles in Epon sections. We conclude tht a least some of the coated vesicles in this region have clathrin coats.

Levamisole and leucocyte migration into sponge exudates

Locally administered levamisole enhanced leucocyte migration into inert sponges implanted into rats for either 4 or 48 h. The stimulated cell at both times was predominantly the polymorphonuclear neutrophil. Locally administered levamisole also enhanced leucocyte migration into inert sponges implanted into arthritic rats, during the primary stage as well as well as during the secondary stage after adjuvant injection when arthritis had been fully established.

Leiomyoma of the oesophagus with calcification

The successful removal of a leiomyoma of the oesophagus in a man aged 64 years is described. The exceptional feature was the presence of calcification within the tumour which is almost unknown. The differential diagnosis from extrinsic causes which produce a similar appearance is discussed in view of this misleading feature. A brief general description of the clinical, radiological, and surgical aspects of leiomyomata of the oesophagus is given.