The present study was designed to investigate whether intermediate-conductance Ca2+-activated K+ channels (K(Ca)3.1 channels) are involved in migration and proliferation induced by AGEs in cultured rat vascular find more smooth muscle cells (VSMCs) using approaches of whole-cell patch voltage:clamp, cell proliferation and migration assay, and western blot analysis. It was found that the current density and protein level
of K(Ca)3.1 channels were enhanced in cells incubated with AGE-BSA (bovine serum albumin), and the effects were reversed by co-incubation of AGE-BSA with anti-RAGE (anti-receptors of AGEs) antibody. The ERK1/2 inhibitors PD98059 and U0126, the P38-MAPK inhibitors SB203580 and SB202190, or the PI3K inhibitors LY294002 and wortmannin countered the K(Ca)3.1 channel expression by AGE-BSA. In addition, AGE-BAS increased cell migration and proliferation, and the effects were fully reversed with anti-RAGE antibody, the K(Ca)3.1 channel blocker TRAM-34, or K(Ca)3.1 small interfering RNA. These results demonstrate for the first time that AGEs-induced increase of migration and proliferation is related to the upregulation of K(Ca)3.1 channels in rat VMSCs, and the intracellular signals ERK1/2, P38-MAPK and PI3K are involved in
the regulation of K(Ca)3.1 channel expression. Laboratory Investigation (2013) 93, 159-167; doi:10.1038/labinvest.2012.163; PCI-32765 price published online 19 November 2012″
“Background: Telomerase activity is a predictor of long-term cellular viability, which decreases with chronic psychological distress (Epel et al., 2004). Buddhist traditions claim that meditation decreases psychological distress and promotes well-being (e.g., Dalai Lama and Cutler, 2009). Therefore, we investigated the effects of a 3-month meditation retreat on telomerase activity and two major contributors to the experience of stress: Perceived
Control (associated with decreased stress) and Neuroticism (associated with increased subjective distress). We used mediation models to test whether changes in Perceived Control and Neuroticism explained meditation retreat effects on telomerase activity. In addition, we investigated whether two qualities developed by meditative practice, increased Mindfulness and Purpose in Thymidylate synthase Life, accounted for retreat-related changes in the two stress-related variables and in telomerase activity.
Methods: Retreat participants (n = 30) meditated for similar to 6 h daily for 3 months and were compared with a wait-list control group (n = 30) matched for age, sex, body mass index, and prior meditation experience. Retreat participants received instruction in concentrative meditation techniques and complementary practices used to cultivate benevolent states of mind (Wallace, 2006). Psychological measures were assessed pre- and post-retreat.