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Hematopoietic stem cells can self-renew and differentiate into all blood cell types. The transcription factor GATA-2 is expressed in both hematopoietic stem and progenitor cells and is essential for cell proliferation, survival, and differentiation. Recently, evidence from studies of aplastic anemia, MonoMAC syndrome, and lung cancer has demonstrated a mechanistic link between GATA-2 and human pathophysiology. GATA-2-dependent disease processes have been extensively analyzed; however, the transcriptional mechanisms upstream of GATA-2 remain less understood. Here, we conducted high-throughput small-interfering-RNA (siRNA) library screening and showed that YN-1, a human erythroleukemia cell line, expressed high levels of GATA-2 following the activation of the hematopoietic-specific 1S promoter. As transient luciferase reporter assay in YN-1 cells revealed the highest promoter activity in the 1S promoter fused with GATA-2 intronic enhancer (+9.9 kb/1S); therefore, we established a cell line capable of stably expressing +9.9 kb/1S-Luciferase. Subsequently, we screened 995 transcription factor genes and revealed that CITED2 acts as a GATA-2 activator in human hematopoietic cells. These results provide novel insights into and further identify the regulatory mechanism of GATA-2.

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A middle-aged woman who had undergone autologous hematopoietic stem cell transplantation (HSCT) 1 month previously suffered severe epigastralgia and relapse of lymphoma. The epigastralgia was not relieved by chemotherapy. Thereafter, her pancreatic and hepatic enzyme levels were markedly elevated and disseminated varicella emerged. Despite acyclovir administration, her general condition deteriorated rapidly and she died. Serum varicella zoster virus (VZV) DNA level was shown to be elevated and a diagnosis of disseminated VZV infection was established postmortem. In patients with severe abdominal pain following HSCT, early suspicion and therapeutic intervention for VZV are important, even in the absence of skin lesions. 〔J Clin Exp Hematop 54(3) : 237-241, 2014〕

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