[1-14C]Glucosamine Incorporation by Subcellular Fractions of Small Intestinal Mucosa

Vitamin D3 effect on the calcium content in subcellular fractions of rat intestinal mucosa.

IITOYO et al. and LAWSON et al. reported that vitamin D3 caused a slight de crease in the activities of Mg-activated DNA-dependent RNA polymerase (1, 2) and Mn++-activated DNA-dependent RNA polymerase (2). However, it is known that calcium inhibits RNA polymerase (3). Since the calcium content of the in testine in vitamin D-treated animals must be higher, the decrease in RNA poly merase activit...

Biosynthesis of plasma lipoproteins. Incorporation of 14C-glucosamine by cells and subcellular fractions of rat liver.

The incorporation of glucosamlneJ4C into plasma lipoproteins has been measured in the intact rat, in liver slices, and in the liver microsome fraction. The labeling of lipoprotein was studied in microsome subfractions, both in viva with glucosammeJ4C and in vitro with UDP-N-acetylglucosamineW. After isolation of lipoproteins with the aid of carrier plasma, labeled lipoproteins were found in smo...

Significance of a Flat Small-intestinal Mucosa.

Malignancy and the Small-intestinal Mucosa.

The observations presented here suggest that malignancy anywhere in the body may be accompanied by a secondary change in the small-intestinal mucosa, including the flattened appearance that is usually seen in idiopathic steatorrhoea. The reverse of this association, that idiopathic steatorrhoea may be complicated by a reticulosis, has been reported by Gough et al. (1962). They described four ca...

Glycoprotein Biosynthesis in Small Intestinal Mucosa

An active multiglycosyltransferase system involved in the transfer of N-acetylgalactosamine, N-acetylglucosamine, and galactose to various glycoprotein acceptors was found in the rat small intestinal mucosa. The present studies are concerned with the subcellular localization of these glycosyltransferases. Satisfactory isolation of smooth and rough surfaced microsomes from the intestinal mucosa ...