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Cytolytic differences among lepidopteran cell lines exposed to toxins ofBacillus thuringiensis subst.Kurstaki. (HD-263) andAizawai (HD-112): Effect of aminosugars and N-glycosylation

  • Infectious Disease/Cellular Pathology
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Summary

Comparison of lytic-dose response behavior of seven lepidopteran cell lines to the activated delta-endotoxin polypeptides ofBacillus thuringiensis subspecieskurstaki (HD-263) andaizawai (HD-112) indicated distinct differences among the lines. The lines derived fromSpodoptera speciesS. exigua (URC-SE-1A) andS. littoralis (UIV-SL-575) were more susceptible to lysis byaizawai towin (Bta) thankurstaki toxin (Btk) as were cells from theLymantria dispar line (IPLB-LD652Y). However, the concentrations of Bta required for lysis of 50% of URC-SE-1A and IPLB-LD652Y cells (LC50) were 0.2 to 0.8 µg/ml compared to 5 to 9 µg/ml for UIV-SL-575 cells. In comparison, Btk LC50 concentrations for the three lines were similar (14 to 19 µg/ml). Cells fromS. frugiperda (IPLB-SF-21AE) andTrichoplusia ni (TN368) were similar in their response to Bta (LC50=2.5 to 3.7 µg/ml) and Btk (LC50=1.0 to 2.8 µg/ml) whereas the lines derived fromHeliothis spp. were the least susceptible to both toxins. The LC50 concentrations for Bta with theH. zea line (IPLB-HA-1075) andH. virescens line (BCIRL-HV-AM1) were >50 µg/ml and for Btk were >50 µg/ml and 42 to 50 µg/ml, respectively, yet for both lines Btk was the more cytolytic.

Cytolysis of TN368 cells could be inhibited to varying extents by preincubation of the toxins with the aminosugars of galactose, mannose, and glucose and theirN-acetyl derivatives. The unsubstituted hexoses were not inhibitory. The order of decreasing inhibitory effectiveness was the same for both toxins regardless of the derivative species and followed the order galactose, mannose, and glucose. Also, inhibition of cytolysis could be achieved to varying extents by assaying cells grown in medium with tunicamycin. Lysis with Btk was inhibited 68 and 37% using treated cells of TN368 and IPLB-LD652Y, respectively; however, no inhibition was observed with URC-SE-1A cells. Further, no inhibition of Bta-mediated lysis was obtained with tunicamycin-grown cells of the three lines.

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  1. Department of Entomology, Pesticide Research Lab, The Pennsylvania State University, 16802, University Park, Pennsylvania

    William J. McCarthy

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McCarthy, W.J. Cytolytic differences among lepidopteran cell lines exposed to toxins ofBacillus thuringiensis subst.Kurstaki. (HD-263) andAizawai (HD-112): Effect of aminosugars and N-glycosylation. In Vitro Cell Dev Biol - Animal 30, 690–695 (1994). https://doi.org/10.1007/BF02631272

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