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10.1152/ajpheart.00836.2015 http://scihub22266oqcxt.onion/10.1152/ajpheart.00836.2015 C4967206!4967206 !27208165     free     free     free Warning: file_get_contents(https://eutils.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pubmed&id=27208165 &cmd=llinks): Failed to open stream: HTTP request failed! 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Small membrane permeable molecules protect against osmotically induced sealing of t-tubules in mouse ventricular myocytes |pdf=|usr=}}{{27208165 }} gab.com Text Small membrane permeable molecules protect against osmotically induced sealing of t-tubules in mouse ventricular myocytes JO: Am J Physiol Heart Circ Physiol http://www.kidney.de/pget.php?&tw=1&pmid=27208165 #FOAvip Cardiac t-tubules are critical for efficient excitation-contraction coupling but become significantly remodeled during various stress conditions. However, the mechanisms by which t-tubule remodeling occur are poorly understood. Recently, we demonstrated that recovery of mouse ventricular myocytes after hyposmotic shock is associated with t-tubule sealing. In this study, we found that the application of Small Membrane Permeable Molecules (SMPM) such as DMSO, formamide and acetamide upon washout of hyposmotic solution significantly reduced the amount of extracellular dextran trapped within sealed t-tubules. The SMPM protection displayed sharp biphasic concentration dependence that peaks at ?140 mM leading to >3- to 4-fold reduction in dextran trapping. Consistent with these data, detailed analysis of the effects of DMSO showed that the magnitude of normalized inward rectifier tail current (IK1,tail), an electrophysiological marker of t-tubular integrity, was increased ?2-fold when hyposmotic stress was removed in the presence of 1% DMSO (?140 mM). Analysis of dynamics of cardiomyocytes shrinking during resolution of hyposmotic stress revealed only minor increase in shrinking rate in the presence of 1% DMSO, and cell dimensions returned fully to prestress values in both control and DMSO groups. Application and withdrawal of 10% DMSO in the absence of preceding hyposmotic shock induced classical t-tubule sealing. This suggests that the biphasic concentration dependence originated from an increase in secondary t-tubule sealing when high SMPM concentrations are removed. Overall, the data suggest that SMPM protect against sealing of t-tubules following hyposmotic stress, likely through membrane modification and essentially independent of their osmotic effects. Twit Text FOAVip Small membrane permeable molecules protect against osmotically induced sealing of t-tubules in mouse ventricular myocytes ????Am J Physiol Heart Circ Physiol http://www.kidney.de/pget.php?&tw=1&pmid=27208165 #FOAvip Twit Text # Free Paper on # # # # # LINK http://www.kidney.de/pget.php?&tw=1&pmid=27208165 #FOAvip English Wikipedia <ref>{{Cite pmid|27208165 }}</ref> Small membrane permeable molecules protect against osmotically induced sealing of t-tubules in mouse ventricular myocytes #MMPMID27208165 Uchida K ; Moench I ; Tamkus G ; Lopatin AN Am J Physiol Heart Circ Physiol 2016[Jul]; 311 (1 ): H229-38 PMID27208165 show ga Cardiac t-tubules are critical for efficient excitation-contraction coupling but become significantly remodeled during various stress conditions. However, the mechanisms by which t-tubule remodeling occur are poorly understood. Recently, we demonstrated that recovery of mouse ventricular myocytes after hyposmotic shock is associated with t-tubule sealing. In this study, we found that the application of Small Membrane Permeable Molecules (SMPM) such as DMSO, formamide and acetamide upon washout of hyposmotic solution significantly reduced the amount of extracellular dextran trapped within sealed t-tubules. The SMPM protection displayed sharp biphasic concentration dependence that peaks at ?140 mM leading to >3- to 4-fold reduction in dextran trapping. Consistent with these data, detailed analysis of the effects of DMSO showed that the magnitude of normalized inward rectifier tail current (IK1,tail), an electrophysiological marker of t-tubular integrity, was increased ?2-fold when hyposmotic stress was removed in the presence of 1% DMSO (?140 mM). Analysis of dynamics of cardiomyocytes shrinking during resolution of hyposmotic stress revealed only minor increase in shrinking rate in the presence of 1% DMSO, and cell dimensions returned fully to prestress values in both control and DMSO groups. Application and withdrawal of 10% DMSO in the absence of preceding hyposmotic shock induced classical t-tubule sealing. This suggests that the biphasic concentration dependence originated from an increase in secondary t-tubule sealing when high SMPM concentrations are removed. Overall, the data suggest that SMPM protect against sealing of t-tubules following hyposmotic stress, likely through membrane modification and essentially independent of their osmotic effects. |*Cell Membrane Permeability [MESH] |*Osmotic Pressure [MESH] |Acetamides/chemistry/metabolism/*pharmacology [MESH] |Animals [MESH] |Cell Membrane/*drug effects/metabolism [MESH] |Dextrans/metabolism [MESH] |Dimethyl Sulfoxide/chemistry/metabolism/*pharmacology [MESH] |Dose-Response Relationship, Drug [MESH] |Excitation Contraction Coupling/drug effects [MESH] |Female [MESH] |Formamides/chemistry/metabolism/*pharmacology [MESH] |Intermediate-Conductance Calcium-Activated Potassium Channels/drug effects/metabolism [MESH] |Male [MESH] |Membrane Potentials [MESH] |Mice, Inbred C57BL [MESH] |Molecular Weight [MESH] |Myocardial Contraction/drug effects [MESH]Small membrane permeable molecules protect against osmotically induced(epmc).pdf DeepDyve Pubget Overpricing