PMID: 1203953Nov 12, 1975Paper

Ultrastructural evidence for a direct connection between the myocardial granules and the sarcoplasmic reticulum in the cardiac ventricle of Myxine glutinosa (L.)

Cell and Tissue Research
K B Helle, A Storesund

Abstract

The occurrence of structural connections between myocardial granules and tubular elements of the sarcoplasmic reticulum in the cardiac ventricle of the Atlantic hagfish is described. The core substance of the myocardial granules is shown to be uranophilic and in this respect similar to the granular cores within the lumen of the sarcoplasmic reticulum. After application of CaCl2-containing fixatives, the ultrastructure of the core substance of these organelles resembles that described for calcium-containing structures in vertebrate glial cells. Incidences of uranophilic core substance in the extracellular space suggest a secretory function of the myocardial granules. Possible implications of the sarcoplasmic reticulum and the myocardial granules in storage, intracellular transport, and secretion of bound calcium are discussed.

Citations

Jan 1, 1979·Progress in Biophysics and Molecular Biology·R A Chapman
Jan 1, 1985·Comparative Biochemistry and Physiology. A, Comparative Physiology·O PoupaM Lomský
Oct 1, 1975·Comparative Biochemistry and Physiology. C: Comparative Pharmacology·A Storesund, K B Helle
Nov 2, 2016·The Journal of Experimental Biology·Christopher M WilsonAnthony P Farrell

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