Publication: The phylogenetic odyssey of the erythrocyte. II. The early or invertebrate prototypes
Loading...
Date
1990
Authors
Glomski, Chester A. ; Tamburlin, Judith
item.page.secondaryauthor
item.page.director
Publisher
Murcia : F. Hernández
publication.page.editor
publication.page.department
DOI
item.page.type
info:eu-repo/semantics/article
Description
Abstract
Freely existing hemoglobin-bearing cells
suspended in a plasmic milieu (erythrocytes) are found in
a relatively small number of taxanomically scattered
invertebrates. These species include some annelids,
echiurids, molluscs, phoronids, nemerteans and
echinoderms, e.g. Pista pacifica, Urechis caupo, Noetia
ponderosa, Phoronis australis, Lineus fuscoviridis and
Cucumaria miniata respectively. The typical invertebrate
erythrocyte (hemocyte, coelomocyte) can be described
as permanently nucleated, considerably larger than the
human red cell, oval or circular in configuration and
spherical. biconvex or flattened in profile. The marginal
band of the erythrocyte, a bundle of subplasmalemmal
microtubules that circumscribes the periphery of the cell
and lies in the plane parallel to its flat surface makes
its first appearance in certain invertebrates. This
structure in association with the cell surface-associated
cytoskeleton is responsible for the flattened elliptical
shape seen in some invertebrate erythrocytes and
endows them with flexibility and resilience to mechanical
forces. This in an evolutionarily persistent characteristic
that is retained throughout the submammalian
vertebrates. The erythrocytes of invertebrates are more morphologically and functionally diversified than the
mammalian model. In addition to respiratory activities
(oxygen storage and transport) they can sometimes
function as vendors of nutrients and participate in other
less obvious processes. These cells therefore frequently
not only retain organelles that are usually discarded by
vertebrate erythrocytes (ribosomes. golgi apparatus,
etc.) but may also depending upon the species, manifest
in their cytoplasm organelles and
inclusions that are not a normal component of
developing or mature submammalian vertebrate and
mammalian erythroid cells. Examples of the latter are
pigment granules, lipid droplets, extensive glycogen stores and prominent Prussian blue positive inclusions.
Erythrocytes in the invertebrates, though presenting
certain cytologic and functional features in common, are
a heterogenous collection of cells, each tailored for a
specific species or group of organisms.
publication.page.subject
Citation
item.page.embargo
Ir a Estadísticas
Sin licencia Creative Commons.