Title : Regulation of expression of the gene encoding the major surfactant protein (SP-A) in human fetal lung in vitro. Disparate effects of glucocorticoids on transcription and on mRNA stability.

Pub. Date : 1989 Jul 5

PMID : 2544593






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1 We previously observed that dexamethasone had a biphasic effect on the levels of mRNA encoding the major surfactant protein (SP-A) in human fetal lung in vitro; at concentrations of 10(-10) and 10(-9) M, dexamethasone caused an increase in the levels of SP-A mRNA, whereas at concentrations of greater than 10(-8) M, the steroid had a pronounced inhibitory effect on SP-A mRNA levels. Dexamethasone surfactant protein A1 Homo sapiens
2 We previously observed that dexamethasone had a biphasic effect on the levels of mRNA encoding the major surfactant protein (SP-A) in human fetal lung in vitro; at concentrations of 10(-10) and 10(-9) M, dexamethasone caused an increase in the levels of SP-A mRNA, whereas at concentrations of greater than 10(-8) M, the steroid had a pronounced inhibitory effect on SP-A mRNA levels. Dexamethasone surfactant protein A1 Homo sapiens
3 We previously observed that dexamethasone had a biphasic effect on the levels of mRNA encoding the major surfactant protein (SP-A) in human fetal lung in vitro; at concentrations of 10(-10) and 10(-9) M, dexamethasone caused an increase in the levels of SP-A mRNA, whereas at concentrations of greater than 10(-8) M, the steroid had a pronounced inhibitory effect on SP-A mRNA levels. Dexamethasone surfactant protein A1 Homo sapiens
4 We previously observed that dexamethasone had a biphasic effect on the levels of mRNA encoding the major surfactant protein (SP-A) in human fetal lung in vitro; at concentrations of 10(-10) and 10(-9) M, dexamethasone caused an increase in the levels of SP-A mRNA, whereas at concentrations of greater than 10(-8) M, the steroid had a pronounced inhibitory effect on SP-A mRNA levels. Dexamethasone surfactant protein A1 Homo sapiens
5 It was also found that dexamethasone antagonized the stimulatory effect of dibutyryl cyclic AMP (Bt2cAMP) on SP-A mRNA levels in human fetal lung in vitro. Dexamethasone surfactant protein A1 Homo sapiens
6 It was our objective, in the present study, to characterize further the effects of dexamethasone and Bt2cAMP on SP-A mRNA levels in human fetal lung tissue and to determine whether such effects are associated with comparable changes in the transcriptional activity of the SP-A gene. Dexamethasone surfactant protein A1 Homo sapiens
7 We found that the action of dexamethasone (10(-7) M) to reduce the levels of SP-A mRNA in control and Bt2cAMP-treated fetal lung explants was evident within 2 h of its addition to the culture medium; SP-A mRNA was reduced to barely detectable levels in control and in Bt2cAMP-treated tissues after 24 h of dexamethasone treatment. Dexamethasone surfactant protein A1 Homo sapiens
8 We found that the action of dexamethasone (10(-7) M) to reduce the levels of SP-A mRNA in control and Bt2cAMP-treated fetal lung explants was evident within 2 h of its addition to the culture medium; SP-A mRNA was reduced to barely detectable levels in control and in Bt2cAMP-treated tissues after 24 h of dexamethasone treatment. Dexamethasone surfactant protein A1 Homo sapiens
9 We found that the action of dexamethasone (10(-7) M) to reduce the levels of SP-A mRNA in control and Bt2cAMP-treated fetal lung explants was evident within 2 h of its addition to the culture medium; SP-A mRNA was reduced to barely detectable levels in control and in Bt2cAMP-treated tissues after 24 h of dexamethasone treatment. Dexamethasone surfactant protein A1 Homo sapiens
10 The action of dexamethasone to reduce SP-A mRNA levels was not prevented by co-incubation with either actinomycin D or cycloheximide. Dexamethasone surfactant protein A1 Homo sapiens
11 In contrast to its dose-related biphasic effects on the levels of SP-A mRNA, we found that dexamethasone caused a dose-dependent stimulation of SP-A gene transcription. Dexamethasone surfactant protein A1 Homo sapiens