Ji-zhong Cheng

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The physiological significance of the selenium-independent glutathione peroxidase (GPx) activity of glutathione S-transferases (GSTs), associated with the major Alpha class isoenzymes hGSTA1-1 and hGSTA2-2, is not known. In the present studies we demonstrate that these isoenzymes show high GPx activity toward phospholipid hydroperoxides (PL-OOH) and they(More)
To explore the role of lipid peroxidation (LPO) products in the initial phase of stress mediated signaling, we studied the effect of mild, transient oxidative or heat stress on parameters that regulate the cellular concentration of 4-hydroxynonenal (4-HNE). When K562 cells were exposed to mild heat shock (42 degrees C, 30 min) or oxidative stress (50 microM(More)
Cellular levels of downstream products of membrane lipid oxidation appear to regulate differentiation in K562 human erythroleukemia cells. 4-Hydroxynonenal (4-HNE) is a diffusible and relatively stable product of peroxidation of arachidonic and linoleic acids, cellular levels of which are regulated through metabolism to glutathione (GSH) conjugate by(More)
The two previously reported human glutathione S-transferase isozymes, hGST5.8 and hGSTA4-4, have been suggested to be similar because of their comparable activities toward 4-hydroxynonenal-GSH conjugation. Here, we demonstrate that hGST5.8 and hGSTA4-4 are distinct. Antibodies raised against hGSTA4-4 did not recognize hGST5.8, and antibodies raised against(More)
The majority of deaths from prostate cancer occur in patients with androgen-insensitive metastatic disease. An important early event in the development of the metastatic phenotype is the induction of genes that promote angiogenesis, such as vascular endothelial growth factor (VEGF) and interleukin-8 (IL-8), which are released from tumor cells into their(More)
The mammalian alpha-class glutathione S-transferase (GST) isozymes mGSTA4-4, rGSTA4-4, and hGSTA4-4 are known to utilize 4-hydroxynonenal (4HNE) as a preferred substrate. During the present studies, we have examined the effect of transfecting human myeloid HL-60 cells with mGSTA4, on 4-HNE-induced apoptosis and the associated signaling mechanisms. Results(More)
We have recently shown that RLIP76, a Ral-binding, GTPase-activating protein, is an ATP-dependent transporter of doxorubicin (DOX) as well as glutathione conjugates [Awasthi, S., et al. (2000) Biochemistry 39, 9327-9334]. RLIP76 overexpressed in human cells or transformed E. coli undergoes proteolysis to yield several fragments, including two prominent(More)
Gastrin is a hormone produced by G-cells in the normal gastric antrum. However, colorectal carcinoma cells may aberrantly produce gastrin and exhibit increased expression of cholecystokinin B (CCK-B)/gastrin receptors. Gastrin is trophic for the normal gastric oxyntic mucosa and exerts a growth-promoting action on gastrointestinal malignancy. Thus, gastrin(More)
In this mini review we summarize recent studies from our laboratory, which show the involvement of 4-hydroxynonenal (4-HNE) in cell cycle signaling. We demonstrate 4-HNE induced apoptosis in various cell lines is accompanied with c-Jun-N-terminal kinase and caspase-3 activation. Cells exposed to mild, transient, heat or oxidative stress acquire capacity to(More)
BACKGROUND The inflammatory response plays a critical role in hypertension-induced cardiac remodeling. We aimed to study how interaction among inflammatory cells causes inflammatory responses in the process of hypertensive cardiac fibrosis. METHODOLOGY/PRINCIPAL FINDINGS Infusion of angiotensin II (Ang II, 1500 ng/kg/min) in mice rapidly induced the(More)