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| Content Provider | World Health Organization (WHO)-Global Index Medicus |
|---|---|
| Author | Van Hees, H. W. H. Andrade Acuña, Gl Dekhuijzen, P. N. R. Heunks, L. M. A. Linkels, M. |
| Description | Author Affiliation: van Hees HW ( Department of Pulmonary Diseases, Institute for Fundamental and Clinical Human Movement Sciences, Radboud University Nijmegen Medical Centre, The Netherlands. h.vanhees@long.umcn.nl) |
| Abstract | BACKGROUND AND PURPOSE: Diaphragm muscle weakness occurs in patients with heart failure (HF) and is associated with exercise intolerance and increased mortality. Reduced sensitivity of diaphragm fibres to calcium contributes to diaphragm weakness in HF. Here we have investigated the ability of the calcium sensitizer levosimendan to restore the reduced calcium sensitivity of diaphragm fibres from rats with HF. EXPERIMENTAL APPROACH: Coronary artery ligation in rats was used as an animal model for HF. Sham-operated rats served as controls. Fifteen weeks after induction of HF or sham operations animals were killed and muscle fibres were isolated from the diaphragm. Diaphragm fibres were skinned and activated with solutions containing incremental calcium concentrations and 10 µM levosimendan or vehicle (0.02% DMSO). Developed force was measured at each calcium concentration, and force-calcium concentration relationships were plotted. KEY RESULTS: Calcium sensitivity of force generation was reduced in diaphragm muscle fibres from HF rats, compared with fibres from control rats (P < 0.01). Maximal force generation was â ¼25% lower in HF diaphragm fibres than in control fibres (P < 0.05). Levosimendan significantly increased calcium sensitivity of force generation in diaphragm fibres from HF and control rats, without affecting maximal force generation. CONCLUSIONS AND IMPLICATIONS: Levosimendan enhanced the force generating capacity of diaphragm fibres from HF rats by increasing the sensitivity of force generation to calcium concentration. These results provide strong support for testing the effect of calcium sensitizers on diaphragm muscle weakness in patients with HF. |
| ISSN | 00071188 |
| e-ISSN | 14765381 |
| Journal | British Journal of Pharmacology |
| Issue Number | 3 |
| Volume Number | 162 |
| Language | English |
| Publisher | Wiley Online Library(on behalf of The British Pharmacological Society) |
| Publisher Date | 2011-02-01 |
| Publisher Place | Great Britain (UK) |
| Access Restriction | Open |
| Subject Keyword | Anti-Arrhythmia Agents Pharmacology Calcium Diaphragm Physiology Heart Failure Physiopathology Hydrazones Muscle Contraction Drug Effects Muscle Fibers, Skeletal Pyridazines Animals Chemistry Muscle Weakness Myosin Heavy Chains Rats, Wistar |
| Content Type | Text |
| Resource Type | Article |
| Subject | Pharmacology |
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