Unraveling the mysteries of Sjogrens syndrome: a closer look at the effects of hormones and genetics over time using the NOD.B10.H2b mouse model.Reportar como inadecuado


 Unraveling the mysteries of Sjogrens syndrome: a closer look at the effects of hormones and genetics over time using the NOD.B10.H2b mouse model.


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Type of Resource: text

Genre: Electronic Thesis or Dissertation

Date Issued: 2009

Publisher: Florida Atlantic University

Physical Form: electronic

Extent: xiv, 106 p. : ill. (some col.)

Language(s): English

Summary: Sjogren's Syndrome (SS) is characterized by lymphocytic infiltration, destruction and dysfunction of the lacrimal and salivary glands and the presence of serum autoantibodies. Although, approximately 0.5% of the population suffers from SS, there is a female predominance of 9:1 compared with males. Most women with SS are postmenopausal; however, not all women who are post-menopausal develop SS. Therefore, we postulate that a decrease in the circulating levels of hormones creates an environment favorable to the development of SS in a predisposed genetic background. In order to carry out our studies, we used the NOD.B10.H2b mouse model of SS, and ovariectomized (OVX) them as a model for the post-menopausal condition. We removed the lacrimal glands and measured the gene expression and protein levels of several cytokines and chemokines known to be upregulated in patients with SS such as : lL-1B, IL-10, INF-y, TNFa, CCL9 and CXCL13.

Summary: We also stained for markers of B cells (B220+) and T cells (CD4+ and CD8+), and counted positively stained cleaved caspase-3 cells as an indication of apoptosis. These experiments were done 3, 7 and 21 days post-OVX and compared to sham operated animals. In order to determine whether the changes observed with OVX were triggered mainly by a genetic pre-disposition, a non-prediposed OVX and sham operated mouse (C57BL/10) was used as control. We found that gene expression of IL-1B, IL-10 and IF-y were upregulated in the lacrimal glands of the OVX NOD.B10.H2b mice at 3 days post-OVX compared with sham operated animals. Gene expression of IL-1B, IL-10, IFN-y, TNF-a, CCL9 and CXCL13, and protein levels of IL-1B, IL-10 and CCL9 were upregulated in the OVX NOD.B10.H2b mice at 7 days post-OVX compared to sham operated animals.

Summary: Also, at 7 days, an increase in B220+ B cells and an increase in cleaved caspase-3 were also observed in the OVX NOD.B10.H2b mice lacrimal glands compared to sham operated animals. At 21 days, protein levels of IL-10 were also highly upregulated in the OVX NOD.B10.H2b mice, together with an increase of B220+ B cells, a slight increase in the CD4/CD8 ratio and an increase on the number of caspase-3 positive cells. No changes were observed in any of the above parameters measured in the OVX C57BL/10 mice compared to the sham operated group, supporting our hypothesis that both, genetics and a decrease in the levels of hormones are necessary for SS to occur.

Identifier: 428805047 (oclc), 215292 (digitool), FADT215292 (IID), fau:3426 (fedora)

Note(s): by Vanessa Seamon.Thesis (Ph.D.)--Florida Atlantic University, 2009.Includes bibliography.Electronic reproduction. Boca Raton, Fla., 2009. Mode of access: World Wide Web.

Subject(s): Sjèogren's syndrome -- Immunological aspectsSjèogren's syndrome -- Animal modelsMice as laboratory animalsGene expressionSalivary glands -- Diseases -- Histopathology

Persistent Link to This Record: http://purl.flvc.org/FAU/215292

Owner Institution: FAU



Autor: Seamon, Vanessa.

Fuente: http://fau.digital.flvc.org/islandora/object/fau%3A3426



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