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Inflammatory mediators in autoimmune lacrimal gland disease in MRL/Mpj mice.
- Source :
-
Investigative ophthalmology & visual science [Invest Ophthalmol Vis Sci] 2004 Jul; Vol. 45 (7), pp. 2293-8. - Publication Year :
- 2004
-
Abstract
- Purpose: MRL/MpJ-fas(+)/fas(+) (MRL/+) and MRL/MpJ-fas(lpr)/fas(lpr) (MRL/lpr) mice are congenic substrains of mice that have spontaneously developing lacrimal and salivary gland inflammation and are models for the human disorder Sjögren's syndrome. Nitric oxide (NO) and tumor necrosis factor (TNF)-alpha are proinflammatory and potential mediators of tissue damage. The presence of the inducible form of nitric oxide synthase (iNOS), which catalyzes the production of NO, and the presence TNF-alpha in the lacrimal glands of MRL/MpJ mice were assessed.<br />Methods: Lacrimal glands from MRL/+ and MRL/lpr mice, at ages 1 through 9 months, were evaluated by real-time RT-PCR for iNOS and TNF-alpha mRNA and by immunohistochemistry for the presence of iNOS and of TNF-alpha. Age-matched BALB/c lacrimal glands were used as the control.<br />Results: By quantitative real-time PCR (qPCR), mRNA for iNOS was detected in the lacrimal glands in significantly greater amounts in both MRL/+ (median, normalized to 18S rRNA, 2.90; P < 0.0003) and MRL/lpr mice (median 6.84, P < 0.001) than in BALB/c mice (median 0.34). By qPCR, mRNA for TNF-alpha in the lacrimal glands was detected in significantly greater amounts in aged MRL/+ mice than in BALB/c mice (median, normalized to actin, 221.8 vs. 77.8, P = 0.011) and in MRL/lpr mice than in BALB/c mice (median 136.7 vs. 72.5, P = 0.001). Immunohistochemistry demonstrated both iNOS and TNF-alpha in scattered mononuclear cells throughout the lacrimal glands and in mononuclear cells at the junction of the focal inflammatory infiltrates and normal acinar tissue in both MRL/+ and MRL/lpr mice.<br />Conclusions: As demonstrated by the greater presence of iNOS and TNF-alpha in the lacrimal glands of MRL/MpJ mice than in control glands, both NO and TNF-alpha are potential mediators of lacrimal gland damage in these murine models of Sjögren's syndrome.
- Subjects :
- Animals
Autoimmune Diseases pathology
Disease Models, Animal
Immunoenzyme Techniques
Lacrimal Apparatus metabolism
Mice
Mice, Inbred BALB C
Mice, Inbred MRL lpr
Nitric Oxide Synthase metabolism
Nitric Oxide Synthase Type II
RNA, Messenger metabolism
Reverse Transcriptase Polymerase Chain Reaction
Sjogren's Syndrome pathology
Tumor Necrosis Factor-alpha metabolism
Autoimmune Diseases metabolism
Inflammation Mediators metabolism
Nitric Oxide Synthase genetics
Sjogren's Syndrome metabolism
Tumor Necrosis Factor-alpha genetics
Subjects
Details
- Language :
- English
- ISSN :
- 0146-0404
- Volume :
- 45
- Issue :
- 7
- Database :
- MEDLINE
- Journal :
- Investigative ophthalmology & visual science
- Publication Type :
- Academic Journal
- Accession number :
- 15223808
- Full Text :
- https://doi.org/10.1167/iovs.03-0958