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- W2000671623 abstract "The objective of this work was to characterize basal degradation of newly synthesized collagen in human fetal lung fibroblasts. Analysis of 22 separate determinations showed that in cells incubated under normal conditions, the level of intracellular degradation was normally distributed with a mean of 15.2% and a standard deviation of 2.6%. Within each experiment, however, the uncertainty (standard deviation) in determining degradation was very small, usually less than 1.5%. Consideration of the large variation between experiments and the ability of our analytic technique to detect small, but statistically significant, differences between groups within the same experiment led us to formulate two criteria for determining whether degradation measured in cultures exposed to some agent differs in a biologically significant way from degradation measured in control cultures. These criteria were used to evaluate the effects of the following proteinase inhibitors on basal degradation: NH4Cl, which increases the pH of subcellular compartments that are normally acidic; and leupeptin and Na-p-tosyl-L-lysine chloromethyl ketone (TLCK), which are inhibitors of lysosomal cathepsins (B and L) that degrade collagen. NH4Cl (16 mM) lowered degradation to an extent that was both statistically and biologically significant, but neither leupeptin nor TLCK affected degradation. The effect of NH4Cl on degradation was independent of its inhibitory effects on production of collagen, protein, and ATP. These results suggest that basal degradation occurs in, or beyond, an acidic (i.e., NH4Cl-sensitive) but nonlysosomal compartment of the cell, and that NH4Cl inhibits processing within, or transport to, that compartment. This is the first report of an agent that inhibits basal degradation of newly synthesized collagen in soft tissue fibroblasts." @default.
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- W2000671623 date "1990-01-01" @default.
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- W2000671623 title "Ammonium chloride inhibits basal degradation of newly synthesized collagen in human fetal lung fibroblasts" @default.
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- W2000671623 doi "https://doi.org/10.1016/0003-9861(90)90018-t" @default.
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