THE FOREIGN PARTICLES INJECTION INDUCES STABLE HYALINE CELLS DIFFERENTIATION IN THE HEMOLYMPH OF THE BLOWFLY
CALLIPHORA VICINA LARVAE
T. V. Kind
Laboratory of Biopharmacology and Immunology of Insects, Biological Institute of St. Petersburg State University;
e-mail: tatiana.kind@mail.ru
The stable hyaline cells (thrombocytoids precursors) are prevailing haemocytes type in young larvae of Calliphora vicina. Their concentration decreased
significantly during the crop emptying and become completely absent in wandering larvae. However, the injection of foreign particles into the haemocoel induced
evident increase in the number of stable hyaline cells by means of transformation from prohaemocytes within 24 h after the treatment. Maximum of hyaline cells
concentration is achieved on the 2-3 day when the part of them starts to transform into prothrombocytoids. Injection of both abiotic (charcoal) and biotic (human
erythrocytes) foreign particles exerts an identical effect. Puncture of the body wall, bacterial immunization and injection of saline did not induce hyaline cells
appearance. In crop emptying larvae, the stable hyaline cells originate within the clusters of undifferentiated steam cells, i. e. prohaemocytes. After the completion
of crop emptying in wandering and diapausing larvae, preliminary dedifferentiation of very young plasmatocytes may be also observed. It is suggested that
specification of the stable hyaline cells is induced by thrombocytoids after engulfing of the injected foreign particles and forming of their agglutinates.
Back
Contents
Main
