Expression of XBP1 and antioxidant molecules was also detected in surgically excised specimens from 30 patients with glioma, and 10 normal brain control specimens obtained at autopsy. Results: XBP1 knockdown significantly enhanced the cell death fraction, MMP loss and ROS levels in H2O2- or As2O3-treated glioma cells, concomitant with a decrease of several antioxidant molecules including catalase. Moreover, the abundant expression of XBP1 and antioxidant molecules was also observed in human glioma specimens, as compared with normal brain tissues. Conclusions: KU-60019 cell line XBP1 confers an important role in protection against oxidative stress in gliomas, potentially
via up-regulation of antioxidant molecules such as catalase. Targeting XBP1 may have synergistic effects with ROS inducers on glioma treatment. “
“R. A. Armstrong and N. J. Cairns (2010) Neuropathology
and Applied Neurobiology36, 248–257 Analysis of β-amyloid (Aβ) deposition in the temporal lobe in Alzheimer’s disease using Fourier (spectral) analysis Aim: To determine the spatial pattern of β-amyloid (Aβ) deposition throughout the temporal lobe in Alzheimer’s disease (AD). Methods: Sections of the complete temporal lobe from six cases of sporadic AD were immunolabelled with antibody against Aβ. Fourier (spectral) analysis was used to identify sinusoidal patterns in the fluctuation of Aβ deposition in a direction parallel to the pia mater or alveus. Results: Significant sinusoidal fluctuations in density were evident in 81/99 (82%) analyses. In 64% of analyses, two frequency components selleck compound were present with density peaks of Aβ deposits repeating every 500–1000 µm and at distances greater than 1000 µm. In 25% of analyses, three or more frequency components were present. The estimated period or wavelength (number of sample units to Fossariinae complete one full cycle) of the first and second frequency components did not vary significantly between gyri of the temporal lobe, but there was evidence that the fluctuations of the classic deposits had longer periods than the diffuse and primitive deposits.
Conclusions: (i) Aβ deposits exhibit complex sinusoidal fluctuations in density in the temporal lobe in AD; (ii) fluctuations in Aβ deposition may reflect the formation of Aβ deposits in relation to the modular and vascular structure of the cortex; and (iii) Fourier analysis may be a useful statistical method for studying the patterns of Aβ deposition both in AD and in transgenic models of disease. “
“Clear cell meningioma (CCM) is an uncommon variant of meningioma, corresponding to WHO grade II. We present a case of CCM with histologically aggressive appearance and clinically aggressive behavior. The tumor demonstrated rapid regrowth and brain metastasis. The histological progression from the ordinal CCM to the atypical area and higher MIB-1 index was observed.