An electron microscopic study of hemoglobin synthesis in the marine annelid, Amphitrite ornata (Polychaeta: Terebellidae)

Journal of Morphology
Marc M Friedman, Leon Weiss

Abstract

The heart-body of the marine worm Amphitrite, located within the supraesophageal dorsal vessel, is in the form of a cylinder the thin wall of which is deeply corrugated by luminal projections and folds along its entire length. It is anchored in places to the luminal surface of the dorsal vessel by an extracellular matrix containing collagen fibers. The luminal surfaces of both the heart-body and the dorsal vessel are covered by a basement membrane-like vascular lamina which in turn supports a discontinuous pseudoendothelium of littoral hemocytes. The cells of the heart-body constitute a pseudostratified, high columnar epithelium. They possess extensive rough endoplasmic reticulum (RER), a well developed Golgi zone, ferritin particles and granules, and several types of membrane-bound inclusions. Hemoglobin molecules identical to those in the circulation lie within cytoplasmic, membrane-bound vesicles. Analysis of our electron micrographs suggests the following sequence of hemoglobin production and secretion: Large quantities of a moderately dense flocculent material, probably globin, are synthesized in RER and move to the Golgi zone within partly rough- and partly smooth-surfaced transitional cisternae; small transport vesicles,...Continue Reading

References

Mar 15, 1973·Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences·A P SomlyoR V Rice
Jan 1, 1970·Zeitschrift für Zellforschung und mikroskopische Anatomie·R P Dales, J S Pell
Jun 1, 1965·Comparative Biochemistry and Physiology·C P Mangum, R P Dales
Apr 1, 1949·Biological Reviews of the Cambridge Philosophical Society·J HANSON

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