Abstract：
:The human leukocyte integrin subunit CD11b is expressed predominantly on myelomonocytic cells. To identify CD11b promoter sequences important for myelomonocytic gene expression and to assess the utility of the CD11b promoter for expressing heterologous genes in vivo, we generated transgenic mice with a human CD4 reporter gene driven by CD11b promoter constructs composed of 1.5, 0.3, or 0.1 kb of DNA sequence 5' to the transcription start site. Using flow cytometry to detect the human CD4 reporter on murine leukocytes, two of three 1.5-kb CD11b promoter founder lines showed surface expression of the human CD4 transgene in granulocytes and lymphocytes. The transgene expression observed in lymphocytes was inappropriate relative to the normal pattern of CD11b expression. Of the eight 0.3-kb or 0.1-kb founder lines, only one 0.1-kb founder line showed transgene expression. The overall pattern of transgene expression among the 11 founder lines does not parallel expression of the endogenous CD11b gene. These studies indicate that additional CD11b regulatory elements will be required to express a reporter gene in vivo in a lineage-specific pattern that mimics the endogenous CD11b gene.
journal_name
Bloodjournal_title
Bloodauthors
Back A,East K,Hickstein Dsubject
Has Abstractpub_date
1995-02-15 00:00:00pages
1017-24issue
4eissn
0006-4971issn
1528-0020journal_volume
85pub_type
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