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No apparent damage in the thyroid of transgenic mice expressing antiapoptotic FLIP
Su He Wang1, Patricia Arscott, Peiqing Wu
1Department of Internal Medicine, University of Michigan Medical Center, Ann Arbor, Michigan 48109-0648, USA.
Abstract:
FLIP is an antiapoptotic protein that has been demonstrated to play an important role in inflammation, cancer, and autoimmune diseases. However, it is not known whether increased expression of FLIP (FLICE inhibitory protein) in thyrocytes would alter the development of the thyroid and/or pathogenesis of thyroiditis. To examine the effects of overexpression of this antiapoptotic molecule on the thyroid, we have developed transgenic mouse lines that specifically express FLIP in thyrocytes. A DNA construct designed with an in-frame coding sequence for the E8 protein, a viral FLIP, was put under the control of the thyroglobulin (Tg) promoter (the Tg-FLIP transgene). In 8 of 12 resultant transgenic mouse lines, FLIP expression in thyrocytes driven by the Tg promoter was documented, and confirmed at RNA and protein levels. These Tg-FLIP transgenic mice were monitored for 1 year. Throughout the entire observation period, the transgenic mice remained alive and healthy without evidence of thyroid dysfunction. Adult mice were able to breed. Histologic examination of thyroids obtained at various time points did not reveal significant differences between transgenic mice and their control littermates. Therefore, transgenic mice with thyrocyte-specific expression of FLIP have normal thyroid development with no significant changes in thyroid cell death or proliferation.
Insights
FLIP (FLICE inhibitory protein) overexpression in thyroid cells did not affect thyroid development or lead to thyroiditis in mice. Transgenic mice showed normal thyroid function and histology, indicating FLIP
Area of Science:
- Endocrinology
- Molecular Biology
- Immunology
Background:
- FLIP (FLICE inhibitory protein) is an antiapoptotic protein involved in inflammation, cancer, and autoimmune diseases.
- The role of FLIP in thyroid development and thyroiditis pathogenesis is unknown.
- Thyrocyte-specific FLIP expression could impact thyroid homeostasis.
Purpose of the Study:
- To investigate the effects of FLIP overexpression in thyrocytes on thyroid development and thyroiditis.
- To generate and characterize transgenic mouse models with targeted FLIP expression in thyroid cells.
Main Methods:
- Development of transgenic mouse lines expressing a viral FLIP (E8 protein) under the thyroglobulin (Tg) promoter (Tg-FLIP).
- Confirmation of FLIP expression in thyrocytes at RNA and protein levels.
- Long-term monitoring (1 year) of Tg-FLIP mice for health, thyroid function, and histology.
Main Results:
- Tg-FLIP transgenic mice exhibited normal thyroid development and function without signs of thyroid dysfunction or altered cell death/proliferation.
- Histological examination revealed no significant differences between transgenic and control littermates.
- Transgenic mice were fertile and maintained overall health.
Conclusions:
- Thyrocyte-specific FLIP overexpression does not disrupt normal thyroid development or induce thyroiditis in mice.
- FLIP does not appear to play a critical role in regulating thyrocyte cell death or proliferation under normal physiological conditions.
- These findings suggest FLIP's role in thyroid pathogenesis may be context-dependent or related to specific inflammatory stimuli.
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