Soluble forms of tau are toxic in Alzheimer's disease

Accumulation of neurofibrillary tangles (NFT), intracellular inclusions of fibrillar forms of tau, is a hallmark of Alzheimer Disease. NFT have been considered causative of neuronal death, however, recent evidence challenges this idea. Other species of tau, such as soluble misfolded, hyperphosphorylated, and mislocalized forms, are now being implicated as toxic. Here we review the data supporting soluble tau as toxic to neurons and synapses in the brain and the implications of these data for development of therapeutic strategies for Alzheimer’s disease and other tauopathies

Clinical presentations and surgical management of liver hydatidosis: our 20 year experience

Background. Hydatidosis/echinococcosis of the liver is a very old problem in Greece and still exists, although it is declining. We have reviewed our 20 years’ experience, and here we report the various clinical presentations of the disease and evaluate the clinical outcome of the surgical procedures performed. Patients and methods. We conducted a retrospective analysis of the past 20 years’ medical records; 35 patients (males 34%, females 66%, mean age 58 years) were treated surgically. Results. The presenting symptoms or findings leading to the diagnosis of liver echinococcosis were jaundice (six cases, 17%), abdominal pain (five cases, 14%), gastrointestinal discomfort of the upper abdomen (e.g. nausea, vomiting, distention, anorexia) (two cases, 6%), acute pancreatitis (one case, 3%) and portal hypertension (one case, 3%). The rest of the cases were diagnosed incidentally (20 cases, 57%). External drainage and cystectomy with omentoplasty was performed in 21 cases (60%) and pericystectomy in 14 cases (40%). The mean hospital stay was 16.8 days. Morbidity and mortality were 18% and 3%, respectively, with no statistically significant differences between the two surgical approaches. The recurrence rate averaged 3%. Discussion. A high index of suspicion is recommended when variable clinical manifestations of the upper abdomen are present. Meeting all criteria for surgical treatment of hydatid disease, external drainage and cystectomy should be the standard surgical procedure. Pericystectomy could be used for peripherally located liver cysts that are only partially surrounded by parenchyma. Resection procedures are considered too radical for a benign disease. Appropriate randomized controlled studies are needed to establish the definite surgical management of liver hydatidosis, including modern techniques such as laparoscopy and transcutaneous puncture under US guidance (PAIR technique)