Abstract | PURPOSE: METHODS: Male Lewis rats were dosed with lipopolysaccharide (50 μg/kg LPS) alone or with methylprednisolone (10 and 50 mg/kg) and sacrificed at different time points. Plasma MPL, lung iNOS mRNA expression, plasma nitric oxide (NO) and other physiological factors were measured. Sodium nitrate (750 μmole/kg) was given to a separate cohort of rats to assess NO disposition kinetics. PK-PD modeling was performed with ADAPT 5. RESULTS: Disposition kinetics of plasma MPL and NO showed bi-exponential decline and were described by two-compartment models. LPS increased expression of iNOS mRNA in lung and increased plasma NO, while MPL dosing palliated this increase in a dose-dependent manner. These effects were well captured using tandem indirect response and precursor-pool models. CONCLUSION: The model provides a quantitative assessment of the suppression of NO production by MPL and shows that the major effects are at the transcriptional level by reducing expression of iNOS mRNA.
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Authors | Siddharth Sukumaran, Eve-Irene Lepist, Debra C DuBois, Richard R Almon, William J Jusko |
Journal | Pharmaceutical research
(Pharm Res)
Vol. 29
Issue 8
Pg. 2060-9
(Aug 2012)
ISSN: 1573-904X [Electronic] United States |
PMID | 22422321
(Publication Type: Journal Article, Research Support, N.I.H., Extramural)
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Chemical References |
- Anti-Inflammatory Agents
- Lipopolysaccharides
- RNA, Messenger
- Nitric Oxide
- Nitric Oxide Synthase Type II
- Methylprednisolone
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Topics |
- Animals
- Anti-Inflammatory Agents
(pharmacokinetics, pharmacology)
- Gene Expression Regulation
(drug effects)
- Inflammation
(drug therapy, immunology)
- Lipopolysaccharides
(immunology)
- Male
- Methylprednisolone
(pharmacokinetics, pharmacology)
- Models, Biological
- Nitric Oxide
(immunology)
- Nitric Oxide Synthase Type II
(genetics, immunology)
- RNA, Messenger
(genetics, immunology)
- Rats
- Rats, Inbred Lew
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