Matrix metalloproteinase 9 (MMP-9), also known as 92-kD type IV collagenase/gelatinase, is believed to play a critical role in tumor invasion and metastasis. Here, we report that MMP-9 was constitutively released from the human promyelocytic cell line HL-60 as determined by zymographic analysis. Tumor necrosis factor-alpha (TNF-alpha) enhanced the enzyme release threefold to fourfold and the pr...

The macrophage-like cell line Mm-i consists of spontane ously differentiated cells of a clonal line of mouse myeloid leukemia cells (Ml). Mm-i cells were seeded in soft agar on a harder agar base in the presence or absence of ascitic fluid from rats bearing hepatoma AH-i 30. Although a few colonies developed in the absence of ascitic fluid, the number of cob nies was significantly increased by ...

may be a phenotypic change essential for carcinogenesis in mouse skin. A single, topical application of croton oil or its active component , 12-O-tetracanoyl-phonbol-1 3-acetate (TPA), me suIts in a rapid and substantial increase in mouse epidermal omnithine decarboxylase activity. At 5 hr after TPA applica tion, this enzyme activity, which is the first and rate-limiting step in polyamine biosy...

stroke is an important cause of disability and death worldwide, with the majority of strokes occurring in older people. thrombolysis with recombinant tissue plasminogen activator (r-tpa) is the approved treatment for acute ischemic stroke. a major concern of physicians, who treat acute ischemic stroke with recombinant tissue plasminogen activator (r-tpa,) is the risk of intracerebral hemorrhage...

Mouse cerebellar cells in culture secrete tissue plasminogen activator (tPA) into the culture medium. Fibrin overlays have shown tPA to be associated with granule neurons in these cultures. This cell associated tPA can be displaced by extensive washing of the cells or by a brief lowering of the pH (less than 4), which leads to a loss of fibrinolytic activity by the cells. Incubation of these fi...

BACKGROUND AND PURPOSE Hyperglycemia (HG) has a deleterious effect in stroke patients by accelerating ischemic brain damage; moreover, its antifibrinolytic effect may also influence reperfusion. We aimed to study the effect of acute/chronic HG on tissue-type plasminogen activator (tPA)-induced recanalization. METHODS We studied 139 consecutive stroke patients with documented intracranial arte...

tissue plasminogen activator (tpa) is a serine protease, which is composed of five distinct structural domains with 17 disulfide bonds, representing a model of high-disulfide proteins in human body. one of the most important limitations for high yield heterologous protein production in escherichia coli (e. coli) is the expression of complex proteins with multiple disulfide bridges. in this stud...

Quantitative and qualitative changes in epidermal polyamine levels and DNA synthesis (specific activity and labeling index) after a single topical application of 12-O-tetradecanoylphorbol-13-acetate (TPA), mezerein (MEZ), or ethylphenylpropiolate (EPP) in acetone were studied concomitantly in the same epidermal cell population from each treated mouse. The doses tested were 17 nmol of TPA; 1.7, ...

The purpose of the present study was to investigate the potential neuroprotective effect of neuroserpin (NSP) on acute retinal ischemic/reperfusion-induced (IR) injury. An IR injury model was established by elevating intraocular pressure (IOP) for 60 minutes in wild type and tPA-deficient (tPA-/-) mice. Prior to IR injury, 1 μL of 20 μmol/L NSP or an equal volume of bovine serum albumin (BSA) w...