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Publication Title

Proceedings of the National Academy of Sciences of the United States of America


Department of Biological Sciences


Treatment of Schneider's line 3 Drosophila cells with the steroid hormone ecdysterone rapidly stimulated the synthesis and accumulation of the polypeptide previously designated p7 [Berger, E. M., Ireland, R. C. & Wyss, C. (1980) Somatic Cell Genet. 6, 119-129]. In this report, p7 is identified as the 23,000-dalton heat shock polypeptide (hsp23). In addition to hsp23, the synthesis of the low molecular weight heat shock polypeptides hsp22, hsp26, and hsp27 was also stimulated by ecdysterone, although to different extents. Hybridization of a nick-translated genomic clone containing the hsp23 gene to a total RNA blot showed that ecdysterone stimulation of hsp23 synthesis was the result of an increase in the hsp23 RNA content of S3 cells. We detected no effect of the hormone on the synthesis of heat shock polypeptides hsp68, hsp70, and hsp83.

Original Citation

Ireland RC, Berger EM. Synthesis of low molecular weight heat shock peptides stimulated by ecdysterone in a cultured Drosophila cell line. Proc Natl Acad Sci U S A. 1982;79(3):855-859. doi:10.1073/pnas.79.3.855