Determination of the chelatable iron pool of isolated rat hepatocytes by digital fluorescence microscopy using the fluorescent probe, phen green SK

Frank Petrat, Ursula Rauen, Herbert de Groot – 30 December 2003 – The intracellular pool of chelatable iron is considered to be a decisive pathogenetic factor for various kinds of cell injury. We therefore set about establishing a method of detecting chelatable iron in isolated hepatocytes based on digital fluorescence microscopy. The fluorescence of hepatocytes loaded with the fluorescent metal indicators, phen green SK (PG SK), phen green FL (PG FL), calcein, or fluorescein desferrioxamine (FL‐DFO), was quenched when iron was added to the cells in a membrane‐permeable form.

Growth inhibition by a triple ribozyme targeted to repetitive B2 transcripts

Tina M. Crone, Shani L. Schalles, Catharine M. Benedict, Weihua Pan, Ling Ren, Sarah E. Loy, Harriet Isom, Gary A. Clawson – 30 December 2003 – The B2 family represents a group of short repetitive sequences that are found throughout the rodent genome and are analogous to the human Alu sequences. Certain B2 subfamilies are transcribed by RNA polymerase III (pol III), and this transcription is in part controlled by the retinoblastoma protein.

P‐selectin mediates reperfusion injury through neutrophil and platelet sequestration in the warm ischemic mouse liver

Surinder S. Yadav, David N. Howell, Douglas A. Steeber, Robert C. Harland, Thomas F. Tedder, Pierre‐Alain Clavien – 30 December 2003 – Hepatic damage following ischemia‐reperfusion injury involves polymorphonuclear leukocytes (PMN) and platelet sequestration, however the mechanisms of adhesion remain elusive. In this study, using gene‐targeted deficient mice, we evaluated P‐selectin and its contribution to PMN and platelet adhesion in hepatic damage.

Ask(1) and you shall receive: A new link between antioxidants and cell death signaling

Mark J. Czaja – 30 December 2003 – Hepatoprotection mediated by free radical scavenging molecules such as dimethyl sulfoxide (Me2SO) arose the question as to whether this effect involved one or several anti‐apoptotic signals. Here, using primary cultures of rat hepatocytes and in vivo thioacetamide‐induced liver failure, we showed that Me2SO failed to prevent any cleavage of initiator caspase‐8 and ‐9 but constantly inhibited procaspase‐3 maturation and apoptosis execution, pointing to an efficient inhibition of cleaved initiator caspase activities.

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