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2B, C, D, E and F). We should stress that the serial sections of the same muscles were simultaneously labelled by MHC IIa and MHC I antibodies suggesting co-expression of both types of MHC isoforms in the same fibres. These findings, in agreement with previous reports, indicate that a significant atrophy of SOL muscle is observed during 14-HU that is accompanied by an incomplete slow-to-fast phenotype transition of the muscle following disuse (Frigeri et al. 1998, 2001). In contrast, http://www.selleckchem.com/products/Adriamycin.html FDB muscles from the same animals were not affected by disuse. The muscle-to-body weight ratio was 0.360 �� 0.02 mg g?1 (n= 6 muscles) and 0.385 �� 0.05 mg g?1 (n= 10 muscles) in control and 14-HU rats, respectively, and the measured fibre diameter was 40.1 �� 9 ��m (n= 34 fibres) and 38.1 �� 8 ��m (n= 29 fibres) in control and 14-HU rats, respectively. Patch-clamp experiments showed that the excision of macropatches into ATP-free solution produced a dramatic increase in inward currents in 38% and 35% of macropatches from SOL fibres of control and 14-HU rats, respectively. The total mean inward https://en.wikipedia.org/wiki/Pentamorphone current recorded at ?60 mV (Vm) after excision was ?108.6 �� 11 pA (n= 94 patches) and ?99.1 �� 32 pA (n= 99 patches) for SOL muscles of control and 14-HU rats, respectively. Exposure of macropatches excised from all fibres to intracellular ATP (5 �� 10?3?m) reduced http://www.selleckchem.com/products/LBH-589.html current amplitudes. The total ATP-sensitive current was ?86.5 �� 9 pA (n= 94 patches) and ?80.56 �� 35 pA (n= 99 patches) in SOL fibres of control and 14-HU rats, respectively. A large variability in the KATP current amplitude was observed in the sampled patches from 14-HU rat fibres as compared with those of the controls. This suggested the presence of multiple current components contributing to the total mean current recorded in the fibres. Three groups of SOL muscles have been identified and grouped on the basis of their KATP channel activity and fibre diameter. The possible correlation of these parameters with the predominant muscle phenotype was also evaluated. The first group of muscles (n= 3 muscles) was characterized by a reduced KATP current and fibre diameter of ?65.6 �� 3 pA (n= 31 patches) and 65.4 �� 3 ��m (n= 31 fibres), respectively, and by a low expression level of the MHC type IIa isoform of 21.3 �� 4%. The second (n= 5 muscles) group was characterized by a significantly greater KATP current and fibre diameter of ?75.34 �� 6 pA (n= 51 patches) and 75.96 �� 5 ��m (n= 51 fibres), respectively (P