Journal article
Vascular effects of LPS in mice deficient in expression of the gene for inducible nitric oxide synthase
American journal of physiology. Heart and circulatory physiology, Vol.275(2), pp.H416-H421
08/01/1998
DOI: 10.1152/ajpheart.1998.275.2.H416
PMID: 9683428
Abstract
The inducible isoform of nitric oxide synthase (iNOS) is expressed after systemic administration of lipopolysaccharide (LPS). The importance of expression of iNOS in blood vessels is poorly defined. Because nitric oxide from iNOS may alter vasomotor function, we examined effects of LPS on vasomotor function in carotid arteries from iNOS-deficient mice. We studied contraction of the carotid artery from wild-type and iNOS-deficient mice in vitro 12 h after injection of LPS (20 mg/kg ip). Contractile responses to PGF2α (3–30 μM) and thromboxane A2 analog (U-46619; 3–100 nM) were evaluated using vascular rings from mice treated with vehicle or LPS. Maximum force of contraction generated by rings in response to PGF2α was 0.39 ± 0.02 and 0.25 ± 0.01 (SE) g ( n = 14) in vehicle and LPS-treated wild-type mice, respectively ( P < 0.001 vs. vehicle). Thus LPS reduced constrictor responses in wild-type mice. Thiocitrulline and aminoguanidine (inhibitors of iNOS) improved contractile responses from LPS-treated wild-type vessels. Indomethacin also improved constrictor responses in arteries from wild-type mice injected with LPS. In contrast, contraction of the carotid arteries in response to PGF2α and U-46619 was not impaired in LPS-treated iNOS-deficient mice, and contraction was not altered by inhibitors of iNOS. Expression of iNOS mRNA was confirmed using RT-PCR in carotid arteries from wild-type mice after injection of LPS but not vehicle. PCR products for iNOS were not observed in iNOS-deficient mice. These findings provide the first direct evidence that iNOS mediates impairment of vascular contraction after treatment with LPS.
Details
- Title: Subtitle
- Vascular effects of LPS in mice deficient in expression of the gene for inducible nitric oxide synthase
- Creators
- Carol A Gunnett - Departments of Internal Medicine and Pharmacology, Cardiovascular Center, University of Iowa College of Medicine, Iowa City, Iowa 52242Yi Chu - Departments of Internal Medicine and Pharmacology, Cardiovascular Center, University of Iowa College of Medicine, Iowa City, Iowa 52242Donald D Heistad - Departments of Internal Medicine and Pharmacology, Cardiovascular Center, University of Iowa College of Medicine, Iowa City, Iowa 52242Angela Loihl - Departments of Internal Medicine and Pharmacology, Cardiovascular Center, University of Iowa College of Medicine, Iowa City, Iowa 52242Frank M Faraci - Departments of Internal Medicine and Pharmacology, Cardiovascular Center, University of Iowa College of Medicine, Iowa City, Iowa 52242
- Resource Type
- Journal article
- Publication Details
- American journal of physiology. Heart and circulatory physiology, Vol.275(2), pp.H416-H421
- DOI
- 10.1152/ajpheart.1998.275.2.H416
- PMID
- 9683428
- ISSN
- 0363-6135
- eISSN
- 1522-1539
- Language
- English
- Date published
- 08/01/1998
- Academic Unit
- Cardiovascular Medicine; Neuroscience and Pharmacology; Internal Medicine
- Record Identifier
- 9984040582802771
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