Inhibition of [3H]ponasterone A binding by ecdysone agonists in the intact Kc cell line.

Abstract:

:Inhibition of the binding of [3H]ponasterone A ([3H]PoA) by ecdysone agonists including diacylhydrazines such as RH-5849, tebufenozide (RH-5992) and methoxyfenozide (RH-2485) was examined in intact Drosophila Kc cells. The reciprocal logarithm of the concentration at which there is 50% inhibition of [3H]PoA binding, pIC(50) (M), was determined as the binding activity for all compounds from each concentration-response curve. The order of the activity was PoA>20-hydroxyecdysone>cyasterone>inokosterone>or=makisterone A>methoxyfenozide>or=tebufenozide>ecdysone>RH-5849. The ranking of steroidal ecdysone analogs is consistent with that obtained against Spodoptera Sf-9 cells. Furthermore, in terms of pIC(50), all binding activity for ecdysone analogs, except ecdysone, estimated in the Kc cell line system was significantly higher than that for the Sf-9 cell line system. However, the activity of ecdysone was comparable between Kc and Sf-9 cells. The activity of diacylhydrazine analogs against Kc cells was significantly low compared with that against Sf-9 cells. The potency of methoxyfenozide was 1/200 that of PoA, which showed the highest activity in the Kc cell line system among all compounds tested. The activity of tebufenozide analogs having an n-pentyl or n-hexyl group instead of a 4-ethylphenyl group was similar to that of RH-5849.

authors

Nakagawa Y,Minakuchi C,Takahashi K,Ueno T

doi

10.1016/s0965-1748(01)00105-9

subject

Has Abstract

pub_date

2002-02-01 00:00:00

pages

175-80

issue

2

eissn

0965-1748

issn

1879-0240

pii

S0965174801001059

journal_volume

32

pub_type

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