Enzymatic sulfation of gastric mucous glycoprotein in rat--changes in glycoprotein sulfotransferase activity with stress and anti-ulcer agent, sofalcone

Journal Article · Wed Jul 01 00:00:00 EDT 1987 · Res. Commun. Chem. Pathol. Pharmacol.; (United States)

OSTI ID:5783097

Murakami, S; Muramatsu, M; Aihara, H; Honda, A; Mori, Y

Enzymatic sulfation of mucous glycoprotein (GP) was studied in gastric mucosa of rat. After rat stomach was incubated with (/sup 35/S)-sulfate, incorporation of radioactivity into gastric mucosal APS (adenosine 5'-phosphosulfate), PAPS (3'-phosphoadenosine 5'-phosphosulfate) and endogenous GPs could be detected. The degree of sulfation of endogenous GPs was highest in the macromolecular GP (peak I) and lowest in the low molecular GP (peak III). By using a crude preparation of GP sulfotransferase from rat gastric mucosa, the transfer of (/sup 35/S)-sulfate from (/sup 35/S)-PAPS into macromolecular mucous GP was determined as being the activity of sulfotransferase. The activity of GP sulfotransferase was mainly distributed in the microsomal fraction, and was proportional to the incubation time, substrate (mucous GP) concentration and (/sup 35/S)-PAPS concentration. The enzyme activity was significantly higher in the corpus than that in the antral mucosa. The activity of GP sulfotransferase was significantly decreased at 6 h and was significantly increased at 12 h after the stress load, compared with that of the non-stressed condition. Anti-ulcer agent, sofalcone, increased the GP sulfotransferase activity under the stressed condition. On the other hand, cimetidine showed a significant inhibitory effect under the same condition. Changes in the GP sulfotransferase activity with stress and anti-ulcer agents were consistent with those in the incorporation of (/sup 35/S)-sulfate into macromolecular mucous GP. These results suggest the importance of GP sulfotransferase as a key enzyme regulating the sulfation of mucous GP.

• Research Organization: Tai sho Pharmaceutical Co., Ltd., Saitama, Japan
• OSTI ID: 5783097
• Journal Information: Res. Commun. Chem. Pathol. Pharmacol.; (United States), Vol. 57:1
• Country of Publication: United States
• Language: English

Related Subjects

59 BASIC BIOLOGICAL SCIENCES
GLUCOPROTEINS
METABOLISM
TRANSFERASES
ENZYME ACTIVITY
BIOLOGICAL STRESS
MICROSOMES
MUCOUS MEMBRANES
RATS
RESPONSE MODIFYING FACTORS
STOMACH
SULFATES
SULFUR 35
TRACER TECHNIQUES
ANIMALS
BETA DECAY RADIOISOTOPES
BETA-MINUS DECAY RADIOISOTOPES
BODY
CARBOHYDRATES
CELL CONSTITUENTS
DAYS LIVING RADIOISOTOPES
DIGESTIVE SYSTEM
ENZYMES
EVEN-ODD NUCLEI
GASTROINTESTINAL TRACT
ISOTOPE APPLICATIONS
ISOTOPES
LIGHT NUCLEI
MAMMALS
MEMBRANES
NUCLEI
ORGANIC COMPOUNDS
ORGANOIDS
ORGANS
OXYGEN COMPOUNDS
PROTEINS
RADIOISOTOPES
RODENTS
SACCHARIDES
SULFUR COMPOUNDS
SULFUR ISOTOPES
VERTEBRATES
550501* - Metabolism- Tracer Techniques