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. 1985 Jul;82(13):4414–4417. doi: 10.1073/pnas.82.13.4414

Induction of heat shock and stress proteins in promastigotes of three Leishmania species.

F Lawrence, M Robert-Gero
PMCID: PMC391111  PMID: 3859870

Abstract

The induction of heat shock proteins in three species of Leishmania, L. tropica, L. enrietti, and L. donovani is reported. When cultures of promastigotes are shifted from 26 degrees C to 37 degrees C or 40 degrees C, the synthesis of proteins with apparent molecular weights of 88,000, 74,000, and 54,000 is stimulated. Actinomycin D added just prior to the shift prevented the appearance of these proteins but had no effect when present 30 min after the transfer onward, suggesting that the regulation of leishmanial heat shock proteins occurs at the transcriptional level. Exposure of L. tropica promastigotes to sodium arsenite elicits the synthesis of three major and four minor polypeptides. Their apparent molecular weights are, respectively, 94,000, 78,000, and 56,000 and 70,000, 45,000, 22,000, and 18,000. The response of Leishmania organisms to heat shock and to sodium arsenite is similar to that of other organisms, but some of the proteins identified as stress proteins in the parasite differ in size. The heat shock proteins might play a role in cytodifferentiation during the life cycle of the parasite and also in cellular adaptation to higher temperatures.

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Selected References

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