40 research outputs found
Autoantibodies against NMDAR subunit NR1 disappear from blood upon anesthesia
Anesthetics penetrate the blood-brain-barrier (BBB) and - as confirmed preclinically – transiently disrupt it. An analogous consequence in humans has remained unproven. In mice, we previously reported that upon BBB dysfunction, the brain acts as ‘immunoprecipitator’ of autoantibodies against N-methyl-D-aspartate-receptor subunit-NR1 (NMDAR1-AB). We thus hypothesized that during human anesthesia, pre-existing NMDAR1-AB will specifically bind to brain. Screening of N = 270 subjects undergoing general anesthesia during cardiac surgery for serum NMDAR1-AB revealed N = 25 NMDAR1-AB seropositives. Only N = 14 remained positive post-surgery. No changes in albumin, thyroglobulin or CRP were associated with reduction of serum NMDAR1-AB. Thus, upon anesthesia, BBB opening likely occurs also in humans
Efficient Numerical Self-consistent Mean-field Approach for Fermionic Many-body Systems by Polynomial Expansion on Spectral Density
We propose an efficient numerical algorithm to solve Bogoliubov de Gennes
equations self-consistently for inhomogeneous superconducting systems with a
reformulated polynomial expansion scheme. This proposed method is applied to
typical issues such as a vortex under randomly distributed impurities and a
normal conducting junction sandwiched between superconductors. With various
technical remarks, we show that its efficiency becomes remarkable in
large-scale parallel performance.Comment: 16 pages, 5 figures (published version
Ablation of Ventricular Myosin Regulatory Light Chain Phosphorylation in Mice Causes Cardiac Dysfunction in Situ and Affects Neighboring Myofilament Protein Phosphorylation*
There is little direct evidence on the role of myosin regulatory light
chain phosphorylation in ejecting hearts. In studies reported here we
determined the effects of regulatory light chain (RLC) phosphorylation on
in situ cardiac systolic mechanics and in vitro myofibrillar
mechanics. We compared data obtained from control nontransgenic mice (NTG)
with a transgenic mouse model expressing a cardiac specific
nonphosphorylatable RLC (TG-RLC(P-). We also determined whether the depression
in RLC phosphorylation affected phosphorylation of other sarcomeric proteins.
TG-RLC(P-) demonstrated decreases in base-line load-independent measures of
contractility and power and an increase in ejection duration together with a
depression in phosphorylation of myosin-binding protein-C (MyBP-C) and
troponin I (TnI). Although TG-RLC(P-) displayed a significantly reduced
response to β1-adrenergic stimulation, MyBP-C and TnI were
phosphorylated to a similar level in TG-RLC(P-) and NTG, suggesting
cAMP-dependent protein kinase signaling to these proteins was not disrupted. A
major finding was that NTG controls were significantly phosphorylated at RLC
serine 15 following β1-adrenergic stimulation, a mechanism
prevented in TG-RLC(P-), thus providing a biochemical difference in
β1-adrenergic responsiveness at the level of the sarcomere.
Our measurements of Ca2+ tension and Ca2+-ATPase rate
relations in detergent-extracted fiber bundles from LV trabeculae demonstrated
a relative decrease in maximum Ca2+-activated tension and tension
cost in TG-RLC(P-) fibers, with no change in Ca2+ sensitivity. Our
data indicate that RLC phosphorylation is critical for normal ejection and
response to β1-adrenergic stimulation. Our data also indicate
that the lack of RLC phosphorylation promotes compensatory changes in MyBP-C
and TnI phosphorylation, which when normalized do not restore function