H(2)O(2) disposal in cardiolipin-enriched brain mitochondria is due to increased cytochrome c peroxidase activity.

The mitochondrial electron transport chain is a source of oxygen superoxide anion (O(2)(-)) that is dismutated to H(2)O(2). Although low levels of ROS are physiologically synthesized during respiration, their increase contributes to cell injury. Therefore, an efficient machinery for H(2)O(2) disposal is essential in mitochondria.

Cytochrome c redox state influences the binding and release of cytochrome c in model membranes and in brain mitochondria.

Cytochrome c (cyt c), a component of the respiratory chain, promotes apoptosis when released into the cytosol. Cyt c anchorage within mitochondria depends on cardiolipin (CL). Detachment and release have been related to CL loss and peroxidation.

Uterine arteriovenous malformation: a case report diagnosed by sonohysterography.

Purpose Of Investigation: The aim of this report is to describe a case of uterine arteriovenous malformation that occurred in a 54-year-old postmenopausal woman referring recurrent postmenopausal bleeding, after two years of tamoxifen therapy.

Methods: Medical therapy with GnRh agonists was unsuccessful. Ultrasound and Doppler flow ultrasound scanning were normal and the following hysteroscopy was normal as well.

Activation of PAF-synthesizing enzymes in rat brain stem slices after LTP induction in the medial vestibular nuclei.

LysoPAF acetyltransferase (lysoPAF-AT) and PAF-synthesizing phosphocholinetransferase (PAF-PCT) are the two enzymes which catalyze the final reactions for the synthesis of PAF. Their activities, assayed in the homogenate of rat brain stem slices and under their optimal conditions, increased 5 min after high frequency stimulation of vestibular afferents, inducing LTP in the medial vestibular nuclei. The activity of phosphatidylcholine-synthesizing phosphocholinetransferase, was not affected.