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Hormonal interactions in mammalian collagenase regulation. Comparative studies in human skin and rat uterus
Abstract:
The production of collagenase by human skin explants in culture is prevented by 10(-8) M dexamethasone, 5 . 10(-4) M dibutyryl cyclic AMP, or 2.5 . 10(-3) M theophylline. Decreases in collagenase activity are paralleled by reductions in the degradation of explant collagen during the culture period. Progesterone, which effectively inhibits collagenase production in rat uterine explant cultures, has no effect on human skin explants. The inhibition by cyclic AMP is nucleotide specific. When partially inhibitory concentrations of dexamethasone and dibutyryl cyclic AMP, or dexamethasone and theophylline, are added to culture medium together, the resultant inhibition is that predicted by additivity. Synergistic inhibition, as observed in rat uterus between progesterone and dibutyryl cyclic AMP, fails to occur. Dexamethasone inhibits the production of collagenase by cultured explants of rat uterus, with complete inhibition occurring at 10(-7) M steroid. Synergism between glucocorticoids and dibutyryl cyclic AMP or between dexamethasone and progesterone could not be demonstrated in the uterine culture system. These results suggest the existence of three regulatory systems for the control of collagenase production in mammalian tissues, and that cooperativity between systems may occur on a tissue-specific basis.
Insights
Dexamethasone, dibutyryl cyclic AMP, and theophylline inhibit collagenase production in human skin explants. These compounds regulate collagenase, suggesting tissue-specific control systems in mammals.
Area of Science:
- Biochemistry
- Dermatology
- Molecular Biology
Background:
- Collagenase plays a crucial role in tissue remodeling and degradation.
- Understanding collagenase regulation is vital for addressing conditions involving excessive collagen breakdown.
Purpose of the Study:
- To investigate the effects of specific compounds on collagenase production in human skin explants.
- To explore potential regulatory mechanisms and tissue-specific differences in collagenase control.
Main Methods:
- Human and rat skin and uterine explants were cultured in vitro.
- The effects of dexamethasone, dibutyryl cyclic AMP, theophylline, and progesterone on collagenase production and collagen degradation were assessed.
Main Results:
- Dexamethasone, dibutyryl cyclic AMP, and theophylline significantly inhibited collagenase production in human skin explants.
- Progesterone, effective in rat uterine cultures, showed no effect on human skin explants.
- Inhibition by combined treatments was additive, not synergistic, in human skin.
- Dexamethasone also inhibited collagenase in rat uterine explants, but synergism with other agents was not observed.
Conclusions:
- Mammalian tissues possess at least three distinct regulatory systems for collagenase production.
- The interplay and cooperativity between these systems appear to be tissue-specific.