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Characterization of subclones of the epithelial cell line from Chironomus tentans resistant to the insecticide RH 5992, a non-steroidal moulting hormone agonist
Selection of hormone resistant subclones in the continuous presence of the insecticide and ecdysteroid mimick RH 5992 (tefubenozide) resulted preferentially in clones with defects in ecdysteroid receptor function. RH 5992 is already degraded to polar products in wild-type cells; no increase in metab...
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| Published in: | Insect biochemistry and molecular biology 2000-07, Vol.30 (7), p.591-600 |
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| cites | cdi_FETCH-LOGICAL-c392t-a4bf608e00bd383aed576f2f5d70c941d54e4ab9624e53491de4931432e0d6ef3 |
| container_end_page | 600 |
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| container_title | Insect biochemistry and molecular biology |
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| creator | Grebe, Marco Rauch, Peter Spindler-Barth, Margarethe |
| description | Selection of hormone resistant subclones in the continuous presence of the insecticide and ecdysteroid mimick RH 5992 (tefubenozide) resulted preferentially in clones with defects in ecdysteroid receptor function. RH 5992 is already degraded to polar products in wild-type cells; no increase in metabolism of tefubenozide is observed in resistant clones. According to Western blots, ecdysteroid receptor (EcR) and its heterodimerization partner ultraspiracle (USP) are present in all resistant clones. The concentrations are comparable to wild-type cells, but in three clones the extent of phosphorylation of USP is diminished. With regard to hormone binding several types of hormone resistance are distinguished: (1) The same two high-affinity hormone recognition sites are present as in wild-type cells (K
D1=0.31±0.28 nM, K
D2=6.5±2.4 nM) but the number of binding sites is reduced. (2) The binding site with the lower affinity (K
D2) is missing. (3) The binding site with the higher affinity (K
D1) is missing. (4) No specific binding is observed. Ponasterone A binding can be rescued by addition of EcR but not by USP. (5) Ligand specificity is altered. RH 5992 can not compete [
3H]-ponasterone A as efficient as in wild-type cells. |
| doi_str_mv | 10.1016/S0965-1748(00)00032-1 |
| format | article |
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D1=0.31±0.28 nM, K
D2=6.5±2.4 nM) but the number of binding sites is reduced. (2) The binding site with the lower affinity (K
D2) is missing. (3) The binding site with the higher affinity (K
D1) is missing. (4) No specific binding is observed. Ponasterone A binding can be rescued by addition of EcR but not by USP. (5) Ligand specificity is altered. RH 5992 can not compete [
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D1=0.31±0.28 nM, K
D2=6.5±2.4 nM) but the number of binding sites is reduced. (2) The binding site with the lower affinity (K
D2) is missing. (3) The binding site with the higher affinity (K
D1) is missing. (4) No specific binding is observed. Ponasterone A binding can be rescued by addition of EcR but not by USP. (5) Ligand specificity is altered. RH 5992 can not compete [
3H]-ponasterone A as efficient as in wild-type cells.</description><subject>Animals</subject><subject>Binding Sites - genetics</subject><subject>Cell Line</subject><subject>Chironomidae</subject><subject>Chironomidae - cytology</subject><subject>Chironomidae - genetics</subject><subject>Chironomus tentans</subject><subject>Cloning, Molecular</subject><subject>Ecdysteroid</subject><subject>Ecdysteroids</subject><subject>Epithelial Cells - drug effects</subject><subject>Epithelial Cells - physiology</subject><subject>Hydrazines - pharmacology</subject><subject>Insecticide Resistance</subject><subject>Insecticides - pharmacology</subject><subject>Ligands</subject><subject>Receptor</subject><subject>Selection, Genetic</subject><subject>Steroids - pharmacology</subject><subject>Tefubenozide</subject><issn>0965-1748</issn><issn>1879-0240</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2000</creationdate><recordtype>article</recordtype><recordid>eNqFkd2KFDEQhYMo7rj6CEquRMHWSifp7lyJDOoKCwv-XId0Ur0T6U7GJC2sT-OjbmZmkb3zqhL4zjlUHUKeM3jLgHXvvoHqZMN6MbwCeA0AvG3YA7JhQ68aaAU8JJt_yBl5kvPPCgkh-8fkjMEgRCvZhvzd7kwytmDyf0zxMdA40byOdo4B8-FTdkhx7-uYvZmpxXmmsw9IpxQXut35FENc1kwLhmJCpgmzz_VVaIlHtQ8ZbfHWO6RfL6hUqn1DDQ0xNLkGR--q7xLXufhwTXcxLTWbmusYqs9T8mgyc8Znd_Oc_Pj08fv2orm8-vxl--GysVy1pTFinDoYEGB0fOAGney7qZ2k68EqwZwUKMyoulag5EIxh0JxJniL4Dqc-Dl5efLdp_hrxVz04vNhWRMwrlmzXspBSl5BeQJtijknnPQ--cWkG81AH6rRx2r04e4aQB-r0azqXtwFrOOC7p7q1EUF3p8ArGv-9ph0th6DRedTvZ920f8n4hbwlqDV</recordid><startdate>20000701</startdate><enddate>20000701</enddate><creator>Grebe, Marco</creator><creator>Rauch, Peter</creator><creator>Spindler-Barth, Margarethe</creator><general>Elsevier Ltd</general><scope>CGR</scope><scope>CUY</scope><scope>CVF</scope><scope>ECM</scope><scope>EIF</scope><scope>NPM</scope><scope>AAYXX</scope><scope>CITATION</scope><scope>7SS</scope></search><sort><creationdate>20000701</creationdate><title>Characterization of subclones of the epithelial cell line from Chironomus tentans resistant to the insecticide RH 5992, a non-steroidal moulting hormone agonist</title><author>Grebe, Marco ; Rauch, Peter ; Spindler-Barth, Margarethe</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c392t-a4bf608e00bd383aed576f2f5d70c941d54e4ab9624e53491de4931432e0d6ef3</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2000</creationdate><topic>Animals</topic><topic>Binding Sites - genetics</topic><topic>Cell Line</topic><topic>Chironomidae</topic><topic>Chironomidae - cytology</topic><topic>Chironomidae - genetics</topic><topic>Chironomus tentans</topic><topic>Cloning, Molecular</topic><topic>Ecdysteroid</topic><topic>Ecdysteroids</topic><topic>Epithelial Cells - drug effects</topic><topic>Epithelial Cells - physiology</topic><topic>Hydrazines - pharmacology</topic><topic>Insecticide Resistance</topic><topic>Insecticides - pharmacology</topic><topic>Ligands</topic><topic>Receptor</topic><topic>Selection, Genetic</topic><topic>Steroids - pharmacology</topic><topic>Tefubenozide</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Grebe, Marco</creatorcontrib><creatorcontrib>Rauch, Peter</creatorcontrib><creatorcontrib>Spindler-Barth, Margarethe</creatorcontrib><collection>Medline</collection><collection>MEDLINE</collection><collection>MEDLINE (Ovid)</collection><collection>MEDLINE</collection><collection>MEDLINE</collection><collection>PubMed</collection><collection>CrossRef</collection><collection>Entomology Abstracts (Full archive)</collection><jtitle>Insect biochemistry and molecular biology</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Grebe, Marco</au><au>Rauch, Peter</au><au>Spindler-Barth, Margarethe</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Characterization of subclones of the epithelial cell line from Chironomus tentans resistant to the insecticide RH 5992, a non-steroidal moulting hormone agonist</atitle><jtitle>Insect biochemistry and molecular biology</jtitle><addtitle>Insect Biochem Mol Biol</addtitle><date>2000-07-01</date><risdate>2000</risdate><volume>30</volume><issue>7</issue><spage>591</spage><epage>600</epage><pages>591-600</pages><issn>0965-1748</issn><eissn>1879-0240</eissn><notes>ObjectType-Article-2</notes><notes>SourceType-Scholarly Journals-1</notes><notes>ObjectType-Feature-1</notes><notes>content type line 23</notes><abstract>Selection of hormone resistant subclones in the continuous presence of the insecticide and ecdysteroid mimick RH 5992 (tefubenozide) resulted preferentially in clones with defects in ecdysteroid receptor function. RH 5992 is already degraded to polar products in wild-type cells; no increase in metabolism of tefubenozide is observed in resistant clones. According to Western blots, ecdysteroid receptor (EcR) and its heterodimerization partner ultraspiracle (USP) are present in all resistant clones. The concentrations are comparable to wild-type cells, but in three clones the extent of phosphorylation of USP is diminished. With regard to hormone binding several types of hormone resistance are distinguished: (1) The same two high-affinity hormone recognition sites are present as in wild-type cells (K
D1=0.31±0.28 nM, K
D2=6.5±2.4 nM) but the number of binding sites is reduced. (2) The binding site with the lower affinity (K
D2) is missing. (3) The binding site with the higher affinity (K
D1) is missing. (4) No specific binding is observed. Ponasterone A binding can be rescued by addition of EcR but not by USP. (5) Ligand specificity is altered. RH 5992 can not compete [
3H]-ponasterone A as efficient as in wild-type cells.</abstract><cop>England</cop><pub>Elsevier Ltd</pub><pmid>10844251</pmid><doi>10.1016/S0965-1748(00)00032-1</doi><tpages>10</tpages></addata></record> |
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| identifier | ISSN: 0965-1748 |
| ispartof | Insect biochemistry and molecular biology, 2000-07, Vol.30 (7), p.591-600 |
| issn | 0965-1748 1879-0240 |
| language | eng |
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| source | ScienceDirect Journals |
| subjects | Animals Binding Sites - genetics Cell Line Chironomidae Chironomidae - cytology Chironomidae - genetics Chironomus tentans Cloning, Molecular Ecdysteroid Ecdysteroids Epithelial Cells - drug effects Epithelial Cells - physiology Hydrazines - pharmacology Insecticide Resistance Insecticides - pharmacology Ligands Receptor Selection, Genetic Steroids - pharmacology Tefubenozide |
| title | Characterization of subclones of the epithelial cell line from Chironomus tentans resistant to the insecticide RH 5992, a non-steroidal moulting hormone agonist |
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