Abstract | PURPOSE: METHODS:
Tetrahydrocortisol was evaluated for glucocorticoid antagonist activity using in vitro and in vivo assays. Systemically administered THF was evaluated for its ability to inhibit dexamethasone-induced body weight loss and systemic hypertension in rats. In vitro receptor antagonism was tested using the supernatant fraction of IM9 cells as the source of soluble glucocorticoid receptor in 3H-dexamethasone displacement binding assays. In addition, six different primary human trabecular meshwork (TM) cell lines were cultured for 0 to 14 days in the absence or presence of dexamethasone (10(-7) M) and/or THF (10(-6) to 10(-8) M). The effects of these steroids on the TM cytoskeleton were determined by epifluorescent microscopy and by transmission electron microscopy. RESULTS:
Tetrahydrocortisol was unable to inhibit the dexamethasone (DEX)-induced systemic hypertension and decrease in body mass in rats and was unable to displace 3H-DEX from the soluble human glucocorticoid receptor. However, THF inhibited the DEX-induced formation of cross-linked actin networks in cultured human TM cells in a progressive and dose-dependent manner (IC50 = 5.7 x 10(-7) M). Dexamethasone caused changes in the TM cell microtubules that were reversed partially by concomitant treatment with THF. Tetrahydrocortisol alone appeared to increase microfilament bundling in TM cells. CONCLUSIONS:
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Authors | A F Clark, D Lane, K Wilson, S T Miggans, M D McCartney |
Journal | Investigative ophthalmology & visual science
(Invest Ophthalmol Vis Sci)
Vol. 37
Issue 5
Pg. 805-13
(Apr 1996)
ISSN: 0146-0404 [Print] United States |
PMID | 8603865
(Publication Type: Journal Article)
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Chemical References |
- Actins
- Anti-Inflammatory Agents
- Receptors, Glucocorticoid
- Tubulin
- Tetrahydrocortisol
- Dexamethasone
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Topics |
- Actins
(metabolism)
- Animals
- Anti-Inflammatory Agents
(antagonists & inhibitors, pharmacology)
- Blood Pressure
(drug effects)
- Body Weight
(drug effects)
- Cell Line
- Cells, Cultured
- Cytoskeleton
(drug effects, metabolism)
- Dexamethasone
(antagonists & inhibitors, pharmacology)
- Fluorescent Antibody Technique
- Humans
- Hypertension
(chemically induced, prevention & control)
- Intraocular Pressure
(drug effects)
- Microscopy, Immunoelectron
- Rats
- Rats, Sprague-Dawley
- Receptors, Glucocorticoid
(metabolism)
- Tetrahydrocortisol
(pharmacology)
- Trabecular Meshwork
(cytology, drug effects, metabolism)
- Tubulin
(metabolism)
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