[Localization of glycosyltransferases in the endoplasmatic membranes of rat splenocytes]

Ultrastructural analysis of glycosaminoglycan hydrolysis in the rat periodontal ligament. I. Evidence for macrophage involvement in bone remodelling

We identified the cellular sites of glycosaminoglycan hydrolysis by localizing a key enzyme, N-acetyl-beta-glucosaminidase, in the rat periodonatal ligament. Reaction product was seen in osteoclasts, osteoblasts, fibroblasts, and in macrophages situated perivascularly in areas of bone remodelling. The preferential location of macrophages in areas of both bone formation and bone resorption, and their intense NAGase activity identified the macrophage as a significant participant in the total process of bone remodelling. We considered the presence of reaction product in the Golgi zone and the rough endoplasmic reticulum of osteoblasts and fibroblasts as possible localization of a NAG-transferase.

Glycoprotein biosynthesis in splenic cells. Purification of a microsomal galactosyl-transferase

One part of the microsomal galactosyl-transferase activity of splenic cells of rats can by solubilized by the action of Triton X-100 and Tween 20. Its purification on a Sephadex G-200 column and by electrophoresis on a polyacrylamide gel leads to a solution of high specific enzymic activity.