Effects of pregnancy on bone matrix proteins in Wistar rats.
Using an EDTA extraction procedure, bones from pregnant Wistar rats were analyzed for their content of collagen and non-collagenous components (sialoprotein, proteoglycan and carbohydrate). The bone matrix size was found to be smaller in pregnant rats than in normal rats (19.5% vs 17.5% of the dry weight bone). The EDTA extractability of the bone protein from pregnant rats was higher than that from controls (2.6% vs 1.9% dry weight bone). EDTA extracts from pregnant rats contained higher amounts of soluble collagen (1.6% vs 0.5% of dry weight tissue) and lower amounts of non-collagenous components (1.65% vs 2.23% for hexoses, 2.38% vs 3.95% for sialic acid and 1.24% vs 1.73% for uronic acid). In bone matrix, collagen content was lower in the pregnant rats (9.45% vs 10.6%). Similarly, the amounts of non-collagenous components were slightly decreased in the bone matrix from the pregnant rats. The respective values were: 0.91% vs 0.93% for hexoses, 0.45% vs 0.52% for sialic acid and 0.39% vs 0.50% for uronic acid. These results suggest that in pregnancy collagen and non-collagenous protein content in bone is decreased while the total mineral content is increased.
D000818:Animals; D001857:Bone Matrix / Q000032:analysis / Q000378:metabolism*; D003094:Collagen / Q000032:analysis; D004492:Edetic Acid; D005260:Female; D005965:Glucuronates / Q000032:analysis; D020723:Glucuronic Acid; D006601:Hexoses / Q000032:analysis; D006909:Hydroxyproline / Q000032:analysis; D019158:N-Acetylneuraminic Acid; D011247:Pregnancy; D011270:Pregnancy, Animal; D011506:Proteins / Q000378:metabolism*; D051381:Rats / Q000378:metabolism*; D011919:Rats, Inbred Strains; D012794:Sialic Acids / Q000032:analysis; D014020:Tissue Extracts
D005965:Glucuronates; D006601:Hexoses; D011506:Proteins; D012794:Sialic Acids; D014020:Tissue Extracts; D020723:Glucuronic Acid; D003094:Collagen; D004492:Edetic Acid; D019158:N-Acetylneuraminic Acid; D006909:Hydroxyproline