László Váli

Oxidative stress with altered element content and decreased ATP level of erythrocytes in hepatocellular carcinoma and colorectal liver metastases

Our aim was to study the possible alterations of redox status (enzymatic and nonenzymatic parameters and metal elements) in erythrocytes of patients with hepatocellular carcinoma (HCC), colorectal liver metastases (CRLM) and benign liver neoplasms. The function of redox homeostasis is closely connected to the energy level of erythrocytes, therefore, the ATP level was also determined. Antioxidant parameters, enzyme activities of superoxide dismutase and glutathione peroxidase were estimated in the erythrocytes of 11 patients with benign tumour, 23 patients with primary malignant and 37 metastatic liver tumour patients and 30 age-matched and sex-matched healthy controls. Element content with inductively coupled plasma optical emission spectrometer and ATP level by the chemiluminometric method were also determined from the samples. Free radical intensity was significantly increased, whereas erythrocyte glutathione peroxidase and superoxide dismutase activities were significantly decreased in the HCC and CRLM groups versus benign groups and controls. Se, Mn and Zn levels were lowered in HCC and CRLM groups versus benign and control groups. The content of Cu, Mg, Se and Zn changed significantly between HCC and CRLM groups. Similarly, ATP concentration decreased in HCC and CRLM versus controls and benign groups. The lowest levels of ATP and antioxidant enzyme activities were found in the case of CRLM patients. These results reveal an alteration in the ATP level of erythrocytes with concomitant changes in the antioxidant defence system in hepatic cancer patients. Altered redox homeostasis (oxidative damage) may lead to decreased ATP level and consequently may play an important role in primary carcinogenesis and generation of metastases, as well.

The effect of ischemic preconditioning on redox status during liver resections-randomized controlled trial

Portal clamping during liver resection decreases intraoperative blood loss, but causes ischemic‐reperfusion (I‐R) injury. Intermittent portal clamping (IPC) and ischemic preconditioning (IP) decreased I‐R injury in animal models. Most of the human studies about IP excluded cirrhotic patients, whose liver is more vulnerable to I‐R injury. The effect of IP and IPC during extended liver resection was investigated in this randomized controlled trial, with special respect to cirrhotic patients.

The beneficial effect of metadoxine (pyridoxine-pyrrolidone-carboxylate) in the treatment of fatty liver diseases

Abstract Hepatic steatosis involves an imbalance between the processes of the hepatocytes’ lipid uptake and lipid elimination, an overproduction results in the accumulation of excess triglycerides in the cells of the liver. Normally about 5% of the cells contain triglyceride; in steatosis this may exceed 50%. Under 50% the condition is called fatty infiltration, and over 50% it is called fatty liver. In mild forms this does not necessarily lead to disorders in cell functions, but in more severe forms it does; it often precedes the death of the cell. Fatty liver can be considered a pathologic condition which makes the liver more susceptible to other toxic influences. It is not a genuine disease; in most cases it is associated with a noxious state or other pathologic process. Alcohol-induced fatty liver is a current epidemie. The abnormal accumulation of fat in parenchymal organs, including the liver, is called fatty transformation or steatosis. Alone and limited to a certain degree of severity (the appeara...