Piezo1 suppression reduces demyelination after intracerebral hemorrhage.

Piezo1 is a mechanically-gated calcium channel. Recent studies have shown that Piezo1, a mechanically-gated calcium channel, can attenuate both psychosine- and lipopolysaccharide-induced demyelination. Because oligodendrocyte damage and demyelination occur in intracerebral hemorrhage, in this study, we investigated the role of Piezo1 in intracerebral hemorrhage.

Vitamin E administration erases an enhanced oxidation in multiple sclerosis.

Systemic peroxidation status has been reported as a pathogenic factor for multiple sclerosis (MS). Systemically elevated oxidation levels are associated with serum lipid peroxidation and somatic telomere length (TL) shortening. We investigated whether vitamin E (VE) administration suppresses peroxidation and improves clinical symptoms in 34 MS patients.

Patients with multiple sclerosis show increased oxidative stress markers and somatic telomere length shortening.

Lipid peroxidation due to oxidative stress (OS) may play an important role in the pathogenesis of chronic systemic inflammatory diseases such as multiple sclerosis (MS). Telomeres, repeated sequences that cap chromosome ends, undergo shortening with each cycle of cell division, resulting in cellular senescence. Research regarding telomere shortening has provided novel insight into the pathogenesis of various diseases.

[Correlation between lacunar cerebral infarction and serum uric acid level in elderly male hypertension patients].

Objective: To study the correlation between lacunar cerebral infarction and level of serum uric acid in elderly male hypertension patients.

Methods: Ninety-eight elderly male hypertension patients were enrolled in this study. They all underwent cerebral magnetic resonance imaging (MRI) scan, and their clinical and laboratory data were collected.

Changes in telomere length distribution in low-dose X-ray-irradiated human umbilical vein endothelial cells.

Ionizing radiation (IR) is known to be a cause of telomere dysfunction in tumor cells; however, very few studies have investigated X-ray-related changes in telomere length and the telomerase activity in normal human cells, such as umbilical vein endothelial cells (HUVECs). The loss of a few hundred base pairs from a shortened telomere has been shown to be important with respect to cellular senescence, although it may not be detected according to traditional mean telomere length [assessed as the terminal restriction fragment (TRF)] analyses. In the present study, a continuous time window from irradiation was selected to examine changes in the telomere length, including the mean TRF length, percentage of the telomere length, telomerase activity, apoptotic rate, and survival rate in HUVECs from the first day to the fourth day after the administration of a 0.

Analysis of telomere length and subtelomeric methylation of circulating leukocytes in women with Alzheimer's disease.

Backgrounds And Aims: Telomere attrition proceeds with the aging process, and is also associated with aging disease conditions, such as Alzheimer's disease (AD). The aging process also affects subtelomeric methylation status. In the present study, the telomere length and the subtelomeric methylation status in female AD patients were analyzed to see how AD affects telomere structure.

Different levels of hypoxia regulate telomere length and telomerase activity.

This study was designed to identify changes in telomere length and telomerase activity in human umbilical vein endothelial cells (HUVECs) exposed to various levels of hypoxia. Mild hypoxia (10%, 15% oxygen) increased telomere length, which did not appear to change under severe hypoxia (1% oxygen). Telomerase activity in HUVECs correlated inversely with oxygen concentration.

The Subtelomere of Short Telomeres is Hypermethylated in Alzheimer's Disease.

Telomere shortening has been reported to be related to oxidative stress (OS) associated with the aging process and aging-associated diseases, including Alzheimer's disease (AD). We measured the methylated and non-methylated telomere lengths in the peripheral blood mononuclear cells of 34 AD patients and 49 healthy controls by a Southern blotting analysis, using methylation-sensitive and - insensitive restriction enzyme isoschizomers, MspI and HpaII. AD patients bore normal mean telomere lengths and had an unchanged distribution of the telomere length in peripheral leukocytes.

[Neuropsychological features of elderly patients with mild cognitive impairment susceptible to Alzheimer's disease].

Objective: To explore the neuropsychological features of elderly patients with mild cognitive impairment (MCI) susceptible to Alzheimer's disease (AD).

Methods: A total of 47 patients with MCI diagnosed from June to October 2008 and 21 controls with normal cognition at the same convalescent camp were selected and followed up for two years. Montreal cognitive assessment (MoCA), mini mental state examination (MMSE) and clock drawing test (CDT) were performed for all subjects at the onset of study and repeated annually.

Alteration of telomere length and subtelomeric methylation in human endothelial cell under different levels of hypoxia.

Background And Aims: Hypoxia-associated changes of telomeric structure in cell cultures have been analyzed mainly in cancer cells, stem cells, or cells transduced with vectors containing the telomerase gene, but not in somatic cells. The stability of telomere structure has been reported to be associated with subtelomeric methylation status. However, there are no reports of epigenetic alterations of telomeric regions of human somatic cells under hypoxia.

Effect of vitamin E administration on the elevated oxygen stress and the telomeric and subtelomeric status in Alzheimer's disease.

Background: Oxidative stress (OS) may be involved in the neurodegenerative process in Alzheimer's disease (AD). Telomeres, the repeated sequences that cap chromosome ends, undergo shortening with each cell division, are sensitive to OS, and serve as markers of a cell's replicative history. Telomere length shortening has been reported to relate to OS with aging process and aging-associated diseases, but the telomeric changes were not always identical, especially in change of telomere length distribution and subtelomeric methylation.