[The foreign particles injection induces stable hyaline cells differentiation in the hemolymph of the blowfly Calliphora vicina larvae].
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 became 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.
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D000818:Animals; D002454:Cell Differentiation; D049109:Cell Proliferation; D002606:Charcoal / Q000494:pharmacology; D004175:Diptera / Q000166:cytology / Q000187:drug effects / Q000276:immunology*; D006434:Hemocytes / Q000166:cytology / Q000187:drug effects / Q000276:immunology*; D006458:Hemolymph / Q000166:cytology / Q000187:drug effects / Q000276:immunology*; D006801:Humans; D006818:Hyalin / Q000276:immunology; D007111:Immunity, Cellular; D007814:Larva / Q000166:cytology / Q000187:drug effects / Q000276:immunology
D002606:Charcoal