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    MARCH1: An Exploration of its Domains and Understanding its Role in the Mechanism of Antigen-Presentation and the Potential Sequela of Dysregulation

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    Author
    Szajman, Adam Craig
    Issue Date
    2013
    Advisor
    Lybarger, Lonnie
    
    Metadata
    Show full item record
    Publisher
    The University of Arizona.
    Rights
    Copyright © is held by the author. Digital access to this material is made possible by the University Libraries, University of Arizona. Further transmission, reproduction or presentation (such as public display or performance) of protected items is prohibited except with permission of the author.
    Abstract
    Current research of membrane-associated ring finger –C3HC4-1 (MARCH1) suggests that its role in mammalian immunity is more complex than was previously thought. MARCH1 is an E3 ubiquitin ligase expressed by antigen-presenting cells of the immune system, where it inhibits antigen presentation by downregulation of its substrates, MHC class II and CD86. We have studied how MARCH1 expression is regulated and determined that the protein levels are regulated, in part, through its inherent instability. We have shown that MARCH1 has distinct regions responsible for both its stability and function. The amino terminus contains a region needed for destabilization of the protein, while the amino acid residues 229-257 are missing: it appears to lead to a loss of function. Preliminary studies into dysregulation of antigen processing, inhibited by loss of MARCH1 expression in mice, have shown inclinations toward a metabolically diseased state. Knock-out (KO) MARCH1 mice have increased amounts of visceral adipose tissue relative to wild type. In addition, our preliminary results, examining transcript levels, suggest that a pro-inflammatory environment may result from the loss of MARCH1 in these fat depots, potentially resulting in metabolic disease. Our results indicate that changes in MARCH1 levels lead to a potentially dysregulated inflammatory environment.
    Type
    text
    Electronic Thesis
    Degree Name
    B.S.
    Degree Level
    bachelors
    Degree Program
    Honors College
    Molecular and Cellular Biology
    Degree Grantor
    University of Arizona
    Collections
    Honors Theses

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