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Interspecies differences in the expression of EC coupling components in thunnus albacares, menticcirhus americanus, and micropogonias undulates and the role of intracellular calcium contribution to cardiac contractility in menticcirhus americanus

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Identifier	Thesis 1922
Author	Ryznar, Rebecca J.
Title	Interspecies differences in the expression of EC coupling components in thunnus albacares, menticcirhus americanus, and micropogonias undulates and the role of intracellular calcium contribution to cardiac contractility in menticcirhus americanus
Publisher	Central Connecticut State University
Date	2007
Resource Type	Master's Thesis
Notes	Recent physiological investigations examining the cardiac calcium handling abilities of tuna and rainbow trout suggest increased reliance on sarcoplasmic reticulum calcium contribution for heart contractility that is both temperature and frequency dependent. (1,2) Both of these fishes, more so tuna, have a high recorded heart rate compared to other species. Of late it has been discovered that the southern kingfish, a species with a relatively modest lifestyle not requiring exceptional cardiac output function, produces a heart rate comparable to the most rapid rates observed in tuna and trout. (unpublished) Analyzing previous findings of SR calcium contribution in other fish with noted high heart rates, it seems that the southern kingfish is utilizing this mammalian-like capability as well. In order to evaluate this hypothesis, cardiac function of isolated cardiac strips from the southern kingfish and croaker (used as a comparative species) has been assessed in the presence of a low concentration of ryanodine which holds the receptor in an open, lower than normal conducting state, and epinephrine, an adrenergic stimulator. Cardiac performance and sensitivity to the low level ryanodine effect are revealed for both fish species from force frequency trial data. Additionally, expression of specific excitation contraction components are examined for southern kingfish, tuna and croaker using immunofluorescent staining of sarcolemmal calcium ATPase, ryanodine receptor , L-Type calcium channel and phospholamban. Staining experiments show evidence of similar expression levels for the ryanodine receptor and sarcolemmal EC components comparable to yellowfin tuna. Future experiments are discussed including additional force frequency experiments assessing cardiac function of southern kingfish and croaker in the presence of a high ryanodine concentration.
Subject	Yellowfin tuna -- Cardiovascular system Rainbow trout -- Cardiovascular system Micropogonias -- Cardiovascular system
Department	Department of Biomolecular Sciences
Advisor	Watson, Cheryl L
Type	Text
Digital Format	application/pdf
Language	eng
OCLC number	713733916
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Home Interspecies differences in the expression of EC coupling components in thunnus albacares,...

Interspecies differences in the expression of EC coupling components in thunnus albacares, menticcirhus americanus, and micropogonias undulates and the role of intracellular calcium contribution to cardiac contractility in menticcirhus americanus

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