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Increased entropy production in diaphragm muscle of PPAR alpha knockout mice.
- Source :
-
Journal of theoretical biology [J Theor Biol] 2008 Jan 07; Vol. 250 (1), pp. 92-102. Date of Electronic Publication: 2007 Sep 21. - Publication Year :
- 2008
-
Abstract
- Peroxisome proliferator activated receptor alpha (PPAR alpha) regulates fatty acid beta-oxidation (FAO) and plays a central role in the metabolic and energetic homeostasis of striated muscles. The thermodynamic consequences of the absence of PPAR alpha were investigated in diaphragm muscle of PPAR alpha knockout mice (KO). Statistical mechanics provides a powerful tool for determining entropy production, which quantifies irreversible chemical processes generated by myosin molecular motors and which is the product of thermodynamic force A/T (chemical affinity A and temperature T) and thermodynamic flow (myosin crossbridge (CB) cycle velocity upsilon). The behavior of both wild type (WT) and KO diaphragm was shown to be near-equilibrium and in a stationary state, but KO was farther from equilibrium than WT. In KO diaphragm, a substantial decrease in contractile function was associated with an increase in both A/T and upsilon and with profound histological injuries such as contraction band necrosis. There were no changes in PPAR delta and gamma expression levels or myosin heavy chain (MHC) patterns. In KO diaphragm, a marked increase in entropy production (A/T x upsilon) accounted for major thermodynamic dysfunction and a dramatic increase in irreversible chemical processes during the myosin CB cycle.
- Subjects :
- Animals
Body Weight
Diaphragm metabolism
Diaphragm pathology
Entropy
Gene Expression Regulation
Male
Mice
Mice, Inbred C57BL
Mice, Knockout
Myosin Heavy Chains analysis
Myosins metabolism
PPAR alpha biosynthesis
PPAR alpha genetics
PPAR delta biosynthesis
PPAR delta genetics
PPAR gamma biosynthesis
PPAR gamma genetics
Protein Isoforms analysis
RNA, Messenger genetics
Reverse Transcriptase Polymerase Chain Reaction methods
Thermodynamics
Diaphragm physiopathology
PPAR alpha deficiency
Subjects
Details
- Language :
- English
- ISSN :
- 0022-5193
- Volume :
- 250
- Issue :
- 1
- Database :
- MEDLINE
- Journal :
- Journal of theoretical biology
- Publication Type :
- Academic Journal
- Accession number :
- 17980390
- Full Text :
- https://doi.org/10.1016/j.jtbi.2007.09.022