Abstract
Dendritic cells (DC) are the professional antigen-presenting cells that initiate immune responses. While DC take up antigen, migrate to lymph nodes and present processed antigen to T lymphocytes, little is known of the intracellular biochemical pathways controlling these events. Using the differential display technique, employing the activated blood DC-like cell line L428, we isolated a cDNA induced during DC differentiation likely to have a regulatory function. This cDNA encoded a putative 530-amino-acid (aa) protein consisting of a unique hydrophilic domain (106 aa) and a domain (424 aa) similar to the methylation pathway enzyme S-adenosylhomocysteine hydrolase (AHCY). Therefore, this molecule was termed DC-expressed AHCY-like molecule (DCAL). DCAL mRNA was expressed moderately in fresh blood DC, but was not detectable in other peripheral blood mononuclear cells. DCAL mRNA increased markedly during activation of blood and skin DC (Langerhans cells), but was diminished in terminally differentiated tonsil DC. Cultured monocytes expressed little DCAL mRNA, but levels increased markedly when differentiated into DC by cytokines GM-CSF and IL-4. The DCAL gene [Chromosome (Chr) 1] and another previously identified DCAL-like molecule...Continue Reading
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