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Phagocytosis of inert particles in Locusta migratoria and Galleria mellonella: Study of ultrastructure and clearance
Authors:M Brehélin  JA Hoffmann
Institution:Equipe de Recherche Associée au C.N.R.S. No. 118, “Biologie Humorale des Insectes”, Laboratoire de Biologie Générale, 12 rue de l''Université, 67000 Strasbourg, France
Abstract:Inert particles (iron saccharate or latex beads) injected in the haemocoel of Locusta migratoria, are taken up by pericardial cells (iron saccharate only), reticular cells of the haemopoietic tissue and certain haemocytes: plasmatocytes and coagulocytes; these two haemocyte types are also the main phagocytic blood cells in Galleria mellonella.Necrosis of phagocytic haemocytes, following injection of an overdose of iron saccharate, explains the profound modifications of the haemogram observed during the first 24 hr following injection; the macrophagic evolution of reticular cells slows down the haemopoietic differentiation of these cells and explains the long term disturbances of the blood picture.Clearance of latex beads injected in larvae of Locusta complies to an exponential function of time; we can determine a granulopectic index which will permit comparisons to be made between clearance of inert and of ‘antigenic-like’ particles.
Keywords:Phagocytosis  reticular cells  pericardial cells  haemocytes  clearance
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