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Impaired Activity of Ryanodine Receptors Contributes to Calcium Mishandling in Cardiomyocytes of Metabolic Syndrome Rats
Conclusion Principal findings of this work are that abnormal Ca2+ transient amplitude, contractile dysfunction; and impaired relaxation of MetS cardiomyocytes underlies intrinsic dysfunctional RyR2 and SERCA pump. Abnormal activity of RyRs was evidenced by its decreased ability to bind [3H]-ryanodine. Although the MetS condition does not modify RyR2 protein expression, its phosphorylation at Ser2814 is decreased, which impairs its capacity for activation during ECC. The dysfunctional RyRs, together with a decreased activity of SERCA pump due to decreased Thr17-PLN phosphorylation suggest a downregulation of CaMKII in MetS...
Source: Frontiers in Physiology - April 29, 2019 Category: Physiology Source Type: research

Spacing out after staying up late? Here ’s why
Ever sleep poorly and then walk out of the house without your keys? Or space out while driving to work and nearly hit a stalled car?A new study led by UCLA ’sDr. Itzhak Fried is the first to reveal how sleep deprivation disrupts brain cells ’ ability to communicate with each other. Fried and his colleagues believe that disruption leads to temporary mental lapses that affect memory and visual perception. Their findings are published online today by Nature Medicine.“We discovered that starving the body of sleep also robs neurons of the ability to function properly,” said Fried, the study’s senior author, a profess...
Source: UCLA Newsroom: Health Sciences - November 6, 2017 Category: Universities & Medical Training Source Type: news

Improved Outcomes in Asymptomatic Obstructive Sleep Apnea
This study enrolled 1522 randomly selected, employed research subjects and observed them for 2 decades. The goal of WSCS was to answer one aspect of a US Congressional mandate to determine the overall public burden of sleep d isorders. The WSCS had a surprising finding: mild OSA was seen in 17% of adults, and, most concerning, 6% of adults had moderate to severe OSA. The WSCS finding most relevant to the current USPSTF recommendation statement is that only 35% of WSCS participants with moderate OSA and 37% of participant s with severe OSA reported excessive daytime sleepiness, the cardinal daytime symptom of OSA. This sugg...
Source: JAMA Neurology - January 24, 2017 Category: Neurology Source Type: research