Alteration of rat liver proteoglycans during regeneration.
Sepharose CL-6B column chromatography of crude extracts from the slices of regenerating rat livers after partial hepatectomy and sham-operated controls labeled with [35S]sulfuric acid revealed an enhancement of [35S]sulfate incorporation into proteoglycan fractions during regeneration. The 35S-labeled proteoglycans contained heparan sulfate (more than 80% of the total) and chondroitin/dermatan sulfate. The 35S-incorporation into both glycosaminoglycans increased to maxima 3-5 days after partial hepatectomy and decreased thereafter toward the respective control levels. When [35S]sulfuric acid was replaced by [3H]glucosamine, similar results were obtained. These results suggest that the maximal stimulation of proteoglycan synthesis in regenerating rat liver follows the maximal mitosis of hepatic cells 1-2 days after partial hepatectomy. The 35S-labeled proteoglycans from regenerating liver 3 days after partial hepatectomy and control were analyzed further. They were similar in chromatographic behavior on a gel filtration or an anion-exchange column and in glycosaminoglycan composition. Their glycosaminoglycans were indistinguishable in electrophoretic mobility. However, these proteoglycans were slightly but significantly different in their affinity to octyl-Sepharose and in the molecular-weight distribution of their glycosaminoglycans.
Otsu
K
K
Department of Biochemistry, St. Marianna University School of Medicine, Kawasaki, Japan.
Kato
S
S
Ohtake
K
K
Akamatsu
N
N
D000818:Animals; D002851:Chromatography, High Pressure Liquid; D002852:Chromatography, Ion Exchange; D005944:Glucosamine; D006023:Glycoproteins / Q000096:biosynthesis; D006025:Glycosaminoglycans / Q000096:biosynthesis / Q000302:isolation & purification; D066298:In Vitro Techniques; D007700:Kinetics; D008099:Liver / Q000378:metabolism*; D008115:Liver Regeneration; D008297:Male; D009844:Oligosaccharides / Q000302:isolation & purification; D011509:Proteoglycans / Q000096:biosynthesis* / Q000302:isolation & purification; D051381:Rats; D011919:Rats, Inbred Strains; D012016:Reference Values; D013431:Sulfates / Q000378:metabolism; D013462:Sulfur Radioisotopes; D013997:Time Factors; D014316:Tritium
D006023:Glycoproteins; D006025:Glycosaminoglycans; D009844:Oligosaccharides; D011509:Proteoglycans; D013431:Sulfates; D013462:Sulfur Radioisotopes; D014316:Tritium; D005944:Glucosamine