Expression of the PML-retinoic acid receptor (PML-RAR ) fusion protein is the initiating genetic event for acute promyelocytic leukemia (APL), but the molecular mechanisms responsible for disease initiation are not yet clear. Several observations have suggested that early myeloid cells are uniquely susceptible to transformation by PML-RAR . Recently, we have shown that the early myeloid-specifi...

Myeloid sarcoma is a tumor mass with extramedullary growth pattern, composed of myeloblasts or immature myeloid cells. The development of myeloid sarcoma may precede or concur with acute or chronic myeloid leukemia (AML or CML) or other myeloproliferative diseases or myelodysplastic syndromes (MDS). Isolated myeloid sarcoma of the breast is very rare. A case is presented of a 25-year-old, previ...

URING THE process of myeloid differentiation, pluriD potent hematopoietic stem cells become committed to myeloid precursor cells and eventually differentiate into functional, morphologically distinct end-stage myeloid cells. This process is accompanied by the coordinate expression of numerous genes. Molecular biology has made possible cloning, analysis of regulation of expression, and character...

The recruitment of myeloid cells has been consistently associated with the formation of new blood vessels during pathological angiogenesis. However, the participation of myeloid cells in bioengineered vascular networks remains unclear. Therefore, we tested whether host myeloid cells play a role in the formation of bioengineered vascular networks that occurs in vivo upon coimplantation of blood-...

Regulation of myeloid cell proliferation and differentiation in the bone marrow is mediated, in part, by the interaction of integrins on early myeloid cells with the extracellular matrix proteins secreted by stromal cells. To further define adhesive protein receptors of early myeloid cells, we examined the expression of the integrin GPIIb-IIIa (aIIbb3) in leukemic cell lines KG-1a, KG-1, and HL...

The 2 most frequent human MLL hematopoietic malignancies involve either AF4 or AF9 as fusion partners; each has distinct biology but the role of the fusion partner is not clear. We produced Mll-AF4 knock-in (KI) mice by homologous recombination in embryonic stem cells and compared them with Mll-AF9 KI mice. Young Mll-AF4 mice had lymphoid and myeloid deregulation manifest by increased lymphoid ...

Growing evidence suggests that hematopoietic stem/progenitor cells (HSPCs), precursors of mature immune cells, may play a direct role in immunosurveillance. Early myeloid progenitors are the major components of HSPCs and they often undergo extensive expansion in stress as a result of myeloid-biased hematopoiesis. Yet, the precise function of early myeloid progenitors remains unclear. Here we sh...

INTRODUCTION Autoreactive T cells are a central element in many systemic autoimmune diseases. The generation of these pathogenic T cells is instructed by antigen-presenting cells (APCs). However, signaling pathways in APCs that drive autoimmune diseases, such as rheumatoid arthritis, are not understood. METHODS We measured phenotypic maturation, cytokine production and induction of T cell pro...

Myeloid sarcoma is a tumor of myeloblast or poorly differentiated myeloid cells that can occur in extramedullary sites, as isolated tumor, concomitantly with or after the diagnosis of acute myeloblastic leukemia. Despite considerable improvement achieved in the outcome of patients with acute myeloblastic leukemia by using intensive chemotherapy and/or hematopoietic stem cell transplantation, it...

BACKGROUND This study aimed to understand the role of myeloid cell clusters in uninvolved regional lymph nodes from early stage non-small cell lung cancer patients. METHODS Uninvolved regional lymph node sections from 67 patients with stage I-III resected non-small cell lung cancer were immunostained to detect myeloid clusters, STAT3 activity and occult metastasis. Anthracosis intensity, myel...