Title page for ETD etd-05082000-10420024


Type of Document Master's Thesis
Author Chen, Dawei
Author's Email Address dachen4@vt.edu
URN etd-05082000-10420024
Title The Role of CD44 in Concanavalin A-Induced Hepatitis
Degree Master of Science
Department Veterinary Medical Sciences
Advisory Committee
Advisor Name Title
Nagarkatti, Mitzi Committee Chair
Howard, Rick Dale Committee Member
Nagarkatti, Prakash S. Committee Member
Keywords
  • Apoptosis
  • Hepatitis
  • CD44
  • Concanavalin A
Date of Defense 2000-05-04
Availability unrestricted
Abstract
Administration of Concanavalin-A (Con A) induces severe injury to the hepatocytes in mice and is considered to be a model for human hepatitis. In the current study, we investigated the role of CD44 in Con A induced hepatitis. Although immune cells have been identified as the causative agent of Con A-induced hepatitis, the exact mechanism of pathogenesis remains unclear. When Con A was injected into CD44 wild type (WT) mice, it induced hepatitis as evident from increased plasma aspartate aminotransferase (AST) levels accompanied by active infiltration of mononuclear cells in the liver and significant induction of apoptosis. Interestingly, Con A injected C57BL/6 CD44-knockout (KO) mice exhibited increased hepatitis with higher levels of apoptosis in the liver and increased plasma AST levels when compared to the CD44 WT mice. Also, transfer of T cells from Con A injected CD44-KO mice into CD44 WT mice induced higher levels of hepatitis when compared to transfer of similar cells from CD44 WT mice into CD44 WT mice. The increased hepatitis seen in CD44-KO mice was partially due to increased production of cytokines such as TNF-a, IL-2 and IFN-g, but not Fas or FasL. Also, it was not caused by altered presence of T cell subsets. The increased susceptibility of CD44 KO mice to hepatitis correlated with increased resistance of T cells from CD44 KO mice to undergo apoptosis when compared to the CD44 WT mice. Together, these data demonstrate that activated T cells use CD44 to undergo apoptosis, and dysregulation in this pathway could lead to increased pathogenesis in a number of diseases, including hepatitis.
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