Our study aimed to clarify speci c oxidative stress and glucose metabolic disorders in hemodialysis patients, by examining hydrogen peroxide (H2O2)and high glucose-induced oxidative stress, glucose transport and the failure of glycolysis. As an in vitro blood cell model of end-stage renal disease (ESRD) in patients with diabetes, human monocytic U937 cells of malignant lymphoma origin were expo...

BACKGROUND Sonodynamic therapy (SDT) is an alternative strategy that manages malignancies via the generation of cytotoxic factors during ultrasound-activated sono-sensitive agents. However, the detailed mechanisms are not clear. This study was to identify the cytotoxic effects of ultrasound-activated protoporphyrin IX (PpIX) on U937 cells. METHODS Flow cytometry was performed to detect the ti...

Beta2-integrin clustering on activation is a key event in leukocyte adhesion to the endothelium during the inflammatory response. In the search for molecular mechanisms leading to this clustering, we have identified low-density lipoprotein (LDL) receptor-related protein (LRP) as a new partner for beta2-integrins at the leukocyte surface. Immobilized recombinant LRP fragments served as an adhesi...

We report the purification of a protease from tumor cells undergoing apoptosis that is involved in activating DNA fragmentation. Initial studies revealed that two inhibitors of serine proteases, N-1-tosylamide-2-phenylethylchloromethyl ketone and carbobenzoxy-Ala-Ala-borophe (DK120), suppressed tumor necrosis factor or ultraviolet (UV) light-induced DNA fragmentation in the U937 histiocytic lym...

The mechanism by which complement fragment C5a elevates intracellular Ca2+ ([Ca2+]i) levels in two cell types, a monocytic cell line, U937, and neutrophils, has been investigated by the use of fluorometric and radiometric techniques. In U937 cells the influx of extracellular Ca2+ can be distinguished from the release of intracellular Ca2+ stores in terms of dose-responsiveness to C5a and sensit...

We analyzed the effect of recombinant human ¡nterleukin6 (IL-6), in combination with human recombinant interleukin la (IL-la), on the growth and differentiation of several human and mouse myeloid leukemic cell lines, specifically U937, HL-60, Ml, and its subclone Ml-3b-N, into macrophage-like cells. IL-6 and IL-1 inhibited the growth of U937, Ml, and Ml-3b-N in a dose-dependent manner. Treatme...

Copper (Cu) deficiency suppresses macrophage activities in animals and humans. Our previous studies indicated that the induction of Cu deficiency in differentiated U937 monocytic cells impairs respiratory burst and bactericidal activities and lipopolysaccharide-mediated secretion of inflammatory mediators. The current investigation examined the roles of Cu in the monocytic differentiation proce...

Quantitative determination of trans-cinnamaldehyde (TCA) was conducted by reversed-phase HPLC from young and mature leaves, and leaf branches of Cinnamomum osmophloeum, a Taiwan endemic plant. The results showed that highest yield, 23.79 mg/g of TCA (the tree’s age was three years) was obtained in the two year old mature leaves. In addition, cytotoxic and inhibitory effects of TCA was evaluated...

The human monoblast leukemia line, U937, is growth-inhibited and induced to develop markers of mature monocytes by lymphokine preparations. Lymphokine is cytostatic and induces expression of Fc receptors in U937 and in myelomonocytic leukemic lines RC-2A and KG-1, but does not have these effects on T- and B-lymphocytic lines. In addition to previously described properties, including complement ...