Abstract:
:The present work aimed at determining whether interleukin-6 (IL-6) produced by skeletal muscle during exercise is related, at least partly, to calcineurin activity. Rats were treated with two specific calcineurin inhibitors, cyclosporin A (CsA) and FK506, or vehicle (Vhl); they were then subjected to exhaustive treadmill running. Modulatory Calcineurin-Interacting Protein-1 (MCIP-1) mRNA levels, a reliable indicator of calcineurin activity, and IL-6 mRNA levels were measured by real-time RT-PCR in soleus muscles, and IL-6 protein concentration was measured in the plasma. Because low carbohydrates availability enhances IL-6 transcription through p38 Mitogen Activated Protein Kinase (MAPK) pathway, muscle glycogen content and glycaemia were measured and p38 MAPK phosphorylation was determined in skeletal muscle by western blotting. As expected, exercise induced an increase in IL-6 (P < 0.01) and MCIP-1 mRNA (P < 0.01) in soleus muscle of Vhl rats, and enhanced p38 phosphorylation and plasmatic IL-6 protein (P < 0.05). Calcineurin inhibition did not affect running time, glycemia or soleus glycogen content. CsA administration totally inhibited the exercise-induced increase in MCIP-1 mRNA (P < 0.01), blunted the IL-6 gene transcription related to muscle activity, and suppressed the changes in IL-6 protein in plasma. In addition to its inhibition of calcineurin activity, FK506 administration totally suppressed the exercise-induced IL-6 gene transcription, likely by an inhibition of p38 activation. Taken together, these results demonstrate that in addition to p38 MAPK, increased calcineurin activity is one of the signalling events involved in IL-6 gene transcription.
journal_name
J Cell Physioljournal_title
Journal of cellular physiologyauthors
Banzet S,Koulmann N,Sanchez H,Serrurier B,Peinnequin A,Alonso A,Bigard Xdoi
10.1002/jcp.20854subject
Has Abstractpub_date
2007-03-01 00:00:00pages
596-601issue
3eissn
0021-9541issn
1097-4652journal_volume
210pub_type
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