Skip to main content
Article
Rostral-Caudal Variation in Troponin T and Parvalbumin Correlates with Differences in Relaxation Rates of Cod Axial Muscle
Journal of Experimental Biology
  • Tierney M. Thys, Duke University
  • Jason M. Blank, Duke University
  • Fred H. Schachat, Duke University
Publication Date
11-1-1998
Abstract

Relaxation rate is an important determinant of axial muscle power production during the oscillatory contractions of undulatory locomotion. Recently, significant differences have been reported in the relaxation rates of rostral versus caudal white muscle fibers of the Atlantic cod Gadus morhua L. The present study investigates the biochemical correlates of this rostral-caudal physiological variation. Using denaturing gel electrophoresis, a series of fresh muscle samples from the dorsal epaxial muscle region was analyzed and several differences were detected. First, a gradual shift occurs in the expression of two troponin T isoforms along the length of the body. Second, rostral muscles were found to contain significantly greater amounts of parvalbumin than caudal muscles. Third, two soluble Ca2+-binding proteins, in addition to parvalbumin, were also detected in the rostral muscle samples yet were absent from the caudal samples. This suite of rostral-caudal variations provides a strong biochemical basis for regional differences in the relaxation rates of cod white muscle.

Disciplines
Publisher statement
The definitive version is available at http://jeb.biologists.org/cgi/content/abstract/201/21/2993.
Citation Information
Tierney M. Thys, Jason M. Blank and Fred H. Schachat. "Rostral-Caudal Variation in Troponin T and Parvalbumin Correlates with Differences in Relaxation Rates of Cod Axial Muscle" Journal of Experimental Biology Vol. 201 Iss. 21 (1998) p. 2993 - 3001
Available at: http://works.bepress.com/jmblank/5/