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- W1994409802 abstract "The metabolic turnover of rat glomerular proteoglycans in vivo was investigated. Newly synthesized proteoglycans were labeled during a 7-h period after injecting sodium [35S]sulfate intraperitoneally. At the end of the labeling period a chase dose of sodium sulfate was given. Subsequently at defined times (0–163 h) the kidneys were perfused in situ with 0.01% cetylpyridinium chloride in phosphate-buffered saline to maximize the recovery of 35S-proteoglycans (14). Glomeruli were isolated from the renal cortex and analyzed for 35S-proteoglycans by autoradiographic, biochemical, and immunochemical methods. Grain counting of autoradiographs revealed a complex turnover pattern of 35S-labeled macromolecules, commencing with a rapid phase followed by a slower phase. Biochemical analysis confirmed the biphasic pattern and showed that the total population of [35S]heparan sulfate proteoglycans had a metabolic half-life (t12) of 20 and 60 h in the early and late phases, respectively. Heparan sulfate proteoglycans accounted for 80% of total 35S-proteoglycans, the remainder being chondroitin/dermatan sulfate proteoglycans. Whole glomeruli were extracted with 4% 3-[(3-cholamidopropyl)dimethylammonio]-1-propanesulfonate-4 m guanidine hydrochloride, a procedure which solubilized >95% of the 35S-labeled macromolecules. Of these 11–13% was immunoprecipitated by an antiserum against heparan sulfate proteoglycan which, in immunolocalization experiments, showed specificity for staining the basement membrane of rat glomeruli (24). Autoradiographic analysis showed that 18% of total radioactivity present at the end of the labeling period was associated with the glomerular basement membrane. The glomerular basement membrane [35S]heparan sulfate proteoglycans, identified by immunoprecipitation, have a very rapid turnover with an initial phase, t12 = 5 h, and a later phase t12 = 20 h." @default.
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- W1994409802 date "1989-03-01" @default.
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- W1994409802 title "In vivo turnover of the basement membrane and other heparan sulfate proteoglycans of rat glomerulus" @default.
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- W1994409802 doi "https://doi.org/10.1016/0003-9861(89)90143-4" @default.
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