Agonists of the peroxisome proliferator-activated receptor alpha induce a fiber-type-selective transcriptional response in rat skeletal muscle.
In rodents, treatment with peroxisome proliferator-activated receptor alpha (PPARalpha) agonists results in peroxisome proliferation, hepatocellular hypertrophy, and hepatomegaly. Drugs in the fibrate class of PPARalpha agonists have also been reported to produce rare skeletal muscle toxicity. Although target-driven hepatic effects of PPARalpha treatment have been extensively studied, a characterization of the transcriptional effects of this nuclear receptor/transcription factor on skeletal muscle responses has not been reported. In this study we investigated the effects of PPARalpha agonists on skeletal muscle gene transcription in rats. Further, since statins have been reported to preferentially effect type II muscle fibers, we compared PPARalpha signaling effects between type I and type II muscles. By comparing the transcriptional responses of agonists that signal through different nuclear receptors and using a selection/deselection analytical strategy based on ANOVA, we identified a PPARalpha activation signature that is evident in type I (soleus), but not type II (quadriceps femoris), skeletal muscle fibers. The fiber-type-selective nature of this response is consistent with increased fatty acid uptake and beta-oxidation, which represent the major clinical benefits of the hypolipidemic compounds used in this study, but does not reveal any obvious off-target pathways that may drive adverse effects.
De Souza
Angus T
AT
Rosetta Inpharmatics LLC, Merck & Co, Inc, Seattle, Washington 98109, USA. angus_desouza@w-link.net
Cornwell
Paul D
PD
Dai
Xudong
X
Caguyong
Michelle J
MJ
Ulrich
Roger G
RG
D000818:Animals; D001629:Bezafibrate / Q000494:pharmacology; D005227:Fatty Acids / Q000378:metabolism; D005260:Female; D011345:Fenofibrate / Q000494:pharmacology; D020869:Gene Expression Profiling; D005947:Glucose / Q000378:metabolism; D000960:Hypolipidemic Agents / Q000494:pharmacology; D008099:Liver / Q000187:drug effects / Q000378:metabolism; D018657:Muscle Fibers, Slow-Twitch / Q000187:drug effects* / Q000378:metabolism; D018482:Muscle, Skeletal / Q000187:drug effects* / Q000378:metabolism; D047493:PPAR alpha / Q000819:agonists*; D011743:Pyrimidines / Q000494:pharmacology; D051381:Rats; D011919:Rats, Inbred Strains; D000077154:Rosiglitazone; D045162:Thiazolidinediones / Q000494:pharmacology; D014212:Tretinoin / Q000494:pharmacology
D005227:Fatty Acids; D000960:Hypolipidemic Agents; D047493:PPAR alpha; D011743:Pyrimidines; D045162:Thiazolidinediones; D000077154:Rosiglitazone; D014212:Tretinoin; C006253:pirinixic acid; D005947:Glucose; D011345:Fenofibrate; D001629:Bezafibrate