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Regional metabolic differences in the rat diaphragm. J Appl Physiol (1985) 1990 Aug;69(2):648-50

Date

08/01/1990

Pubmed ID

2228877

DOI

10.1152/jappl.1990.69.2.648

Scopus ID

2-s2.0-0025045716   26 Citations

Abstract

This study characterized the biochemical properties of the rat diaphragm by measuring the activities of selected citric acid cycle and glycolytic enzymes. The diaphragm was removed from 10 female Sprague-Dawley rats (180 days old) and dissected into five discrete anatomic regions: crural (region 1), left posterior costal (region 2), left anterior costal (region 3), right anterior costal (region 4), and right posterior costal (region 5). Sections were assayed for total protein concentration and the activities of succinate dehydrogenase (SDH) and lactate dehydrogenase (LDH). The SDH activity in the crural region was approximately 18% lower (P less than 0.05) than that in any costal region. Furthermore, protein concentration was significantly lower (P less than 0.05) in the crural region compared with all costal regions. In contrast, costal regions 2-5 did not significantly differ from each other in protein concentration or SDH activity. LDH activity did not differ significantly (P greater than 0.05) between regions. Finally, the LDH-to-SDH activity ratio was significantly higher (P less than 0.05) in the crural diaphragm compared with all costal regions. We conclude that the crural region of the rat diaphragm is significantly lower in oxidative capacity than all the costal regions. Investigators who use a rodent model to study diaphragmatic function and plasticity should consider the oxidative heterogeneity of the diaphragm when designing experiments.

Author List

Powers SK, Lawler J, Criswell D, Silverman H, Forster HV, Grinton S, Harkins D

Author

Hubert V. Forster PhD Professor in the Physiology department at Medical College of Wisconsin




MESH terms used to index this publication - Major topics in bold

Animals
Citric Acid Cycle
Diaphragm
Female
Glycolysis
L-Lactate Dehydrogenase
Proteins
Rats
Rats, Inbred Strains
Succinate Dehydrogenase
Tissue Distribution
jenkins-FCD Prod-399 190a069c593fb5498b7fcd942f44b7bc9cdc7ea1