Selective expression of vacuolar H+-ATPase subunit d2 by particular subsets of dendritic cells among leukocytes

Kota Sato, Sojin Shikano, Guohong Xia, Joe Takao, Jin Sung Chung, Ponciano D Cruz, Xiao-Song Xie, Kiyoshi Ariizumi

Research output: Contribution to journalArticle

14 Scopus citations

Abstract

Dendritic cells (DC) are far more potent to activate T cells than other antigen presenting cells (e.g., macrophages) and distributed to many organs where DC develop to functionally and phenotypically distinctive subsets. To isolate DC-differentially expressed genes, we used a subtractive cDNA cloning (XS52 DC minus J774 macrophages), resulting in the identification of d2 isoform of vacuolar (V) H+-ATPase subunit d. Unlike the ubiquitously expressed isoform (d1), d2 mRNA manifested expression restricted to particular subsets of DC (e.g., skin- and bone marrow-derived DC) among leukocytes and encoded two transcripts (1.6 and 3.0 kb) that differed in the length of the 3′-untranslated region. The d2 protein displayed association with membranes and the localization in lysosomes and antigen-containing endosomes. Interestingly, XS52 DC expressed seven-fold higher V-ATPase proton-pump activity than J774 macrophages and distinguished from the macrophage by high levels of isoforms a1 and a2 expression among V-ATPase subunits. These results indicated that d2 is a new marker for DC and it may, co-operatively with subunit a isoforms, regulate V-ATPase activity.

Original languageEnglish (US)
Pages (from-to)1443-1453
Number of pages11
JournalMolecular Immunology
Volume43
Issue number9
DOIs
Publication statusPublished - Mar 2006

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Keywords

  • Antigen presenting cell
  • Dendritic cell
  • Gene expression
  • Isoform
  • Macrophage
  • Proton pump activity
  • Vacuolar ATPase

ASJC Scopus subject areas

  • Molecular Biology
  • Immunology

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