Canadian Forest Service Publications

Morphological and molecular effects of 20-hydroxyecdysone and its agonist tebufenozide on CF-203, a midgut-derived cell line from the spruce budworm, Choristoneura fumiferana. 2004. Hu, W.; Cook, B.J.; Ampasala, D.R.; Zheng, S.; Caputo, G.F.; Krell, P.J.; Retnakaran, A.; Arif, B.M.; Feng, Q. Archives of Insect Biochemistry and Physiology 55: 68-78.

Year: 2004

Available from: Great Lakes Forestry Centre

Catalog ID: 26800

Language: English

CFS Availability: PDF (request by e-mail)

Abstract

The morphological and molecular responses of a midgut-derived cell line of the spruce budworm, Choristoneura fumiferana, to 20-hydroxyecdysone (20E) and the nonsteroidal ecdysone agonist, tebufenozide (RH-5992), were investigated. The cells responded to these compounds by clumping, generating filamentous extensions, increased mortality and expression of the transcription factor, Choristoneura hormone receptor 3 (CHR3). This cell line can be used as a model system to study the mode of action of ecdysone and its agonists. With subsequent passaging in ecdysteroid-containing medium, the degree of clumping increased and the clumping could not be reversed by subculturing in ecdysteroid-free medium. Cell numbers of the adapted cell lines in 20E and RH-5992 containing media were not significantly decreased, compared to the control, but both cell lines accumulated less 14C-labeled RH-5992 and lost the capability of expressing CHR3 in response to these compounds. Taken together, the cell lines appeared to develop a mechanism to adapt to the toxic effects of these compounds.

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