Abstract
Degranulation and membrane fusion by neutrophils are essential to host defense. We sought homologues of neuron-specific fusion proteins in human neutrophils and in their precursors, the promyelocytic cell line HL-60. We screened a differentiated HL-60 library and obtained an 848 bp sequence with a 351 bp open reading frame, identical to that published for human VAMP-2 and including 5′ and 3′ untranslated regions. RNA from HL-60 cells during differentiation into the neutrophil lineage was subjected to Northern blot analysis, which revealed a transcript of ∼1050 bp at all stages of differentiation. The amount of these transcripts increased approximately threefold during differentiation, a finding confirmed by quantitative RT-PCR. We also detected mRNA for VAMP-2 in human neutrophils and monocytes using RT-PCR. In like fashion, transcripts of syntaxin-4, another fusion protein, were recovered from a neutrophil cDNA library. As with VAMP-2, expression of syntaxin-4 (determined by Northern blots) also increased, but by only 50%, during differentiation of HL-60 cells. These studies demonstrate that neutrophils and their progenitors possess mRNA for the fusion proteins VAMP-2 and syntaxin-4, and that their transcription increases during differentiation, concurrent with the functional maturation of myeloid cells.
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Smolen, J.E., Hessler, R.J., Nauseef, W.M. et al. Identification and Cloning of the SNARE Proteins VAMP-2 and Syntaxin-4 from HL-60 Cells and Human Neutrophils. Inflammation 25, 255–265 (2001). https://doi.org/10.1023/A:1010903804063
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DOI: https://doi.org/10.1023/A:1010903804063