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Am J Physiol Regul Integr Comp Physiol 282: R1687-R1695, 2002; doi:10.1152/ajpregu.00643.2001
0363-6119/02 $5.00
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Vol. 282, Issue 6, R1687-R1695, June 2002

Contractile properties and myosin expression in rats born and reared in hypergravity

F. Picquet1, V. Bouet2, M. H. Canu1, L. Stevens1, Y. Mounier1, M. Lacour2, and M. Falempin1

1 Laboratoire de Plasticité Neuromusculaire, Université des Sciences et Technologies de Lille, 59655 Villeneuve d'Ascq Cedex; and 2 Laboratoire de Neurobiologie des Restaurations Fonctionnelles, Centre National de la Recherche Scientifique Unité Mixte de Recherche 6562, Université de Provence, 52, Faculté de St Jérôme, 13397 Marseille Cedex 20, France

The effects of hypergravity (HG) on soleus and plantaris muscles were studied in Long Evans rats aged 100 days, born and reared in 2-g conditions (HG group). The morphological and contractile properties and the myosin heavy chain (MHC) content were examined in whole muscles and compared with terrestrial control (Cont) age-paired rats. The growth of HG rats was slowed compared with Cont rats. A decrease in absolute muscle weight was observed. An increase in fiber cross-sectional area/muscle wet weight was demonstrated, associated with an increase in relative maximal tension. The soleus muscle changed into a slower type both in contractile parameters and in MHC content, since HG soleus contained only the MHC I isoform. The HG plantaris muscle presented a faster contractile behavior. Moreover, the diversity of hybrid fiber types expressing multiple MHC isoforms (including MHC IIB and MHC IIX isoforms) was increased in plantaris muscle after HG. Thus the HG environment appears as an important inductor of muscular plasticity both in slow and fast muscle types.

Long Evans rats; soleus; plantaris; myosin heavy chain; contractile parameters


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