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Ecdysone oxidase and 3‐oxoecdysteroid reductases in Manduca sexta: Developmental changes and tissue distribution
Year:
1993
Authors :
סבובודה, ג'יימס
;
.
Volume :
23
Co-Authors:
Weirich, G.F., Insect Neurobiology and Hormone Laboratory, Agricultural Research Service, U.S. Department of Agriculture, Beltsville, Maryland, United States
Feldlaufer, M.F., Insect Neurobiology and Hormone Laboratory, Agricultural Research Service, U.S. Department of Agriculture, Beltsville, Maryland, United States
Svoboda, J.A., Insect Neurobiology and Hormone Laboratory, Agricultural Research Service, U.S. Department of Agriculture, Beltsville, Maryland, United States
Facilitators :
From page:
199
To page:
211
(
Total pages:
13
)
Abstract:
The activities of ecdysone oxidase (EO), 3‐oxoecdysteroid 3α‐reductase (3α‐R), and 3‐oxoecdysteroid 3β‐reductase (3β‐R) were determined for epidermis, hemolymph, and fat body of wandering fifth instar Manduca sexta larvae and for midguts of various developmental stages between 3 days after the last larval and 14 days after the pupal ecdysis. The larval midgut was the only organ showing substantial specific activities of EO and 3α‐R, and both increased up to the seventh day after ecdysis. Hemolymph and fat body had only moderate to high 3β‐R and low EO activites, and the epidermis did not contain significant activity of any of the enzymes. On the ninth day after the last larval ecdysis the larval midgut epithelium was replaced by a new pupal midgut epithelium. After this event only 3β‐R was restored to high activities, whereas EO and 3α‐R showed only low to marginal activities. It is concluded that only the larval midgut has a role in the inactivation of ecdysteroids by 3‐epimerization. © 1993 Wiley‐Liss, Inc. Copyright © 1993 Wiley‐Liss, Inc.
Note:
Related Files :
3α‐hydroxyecdysteroid
3β‐hydroxyecdysteroid
3‐dehydroecdysone
עוד תגיות
תוכן קשור
More details
DOI :
10.1002/arch.940230406
Article number:
Affiliations:
Database:
סקופוס
Publication Type:
מאמר
;
.
Language:
אנגלית
Editors' remarks:
ID:
18742
Last updated date:
02/03/2022 17:27
Creation date:
16/04/2018 23:23
Scientific Publication
Ecdysone oxidase and 3‐oxoecdysteroid reductases in Manduca sexta: Developmental changes and tissue distribution
23
Weirich, G.F., Insect Neurobiology and Hormone Laboratory, Agricultural Research Service, U.S. Department of Agriculture, Beltsville, Maryland, United States
Feldlaufer, M.F., Insect Neurobiology and Hormone Laboratory, Agricultural Research Service, U.S. Department of Agriculture, Beltsville, Maryland, United States
Svoboda, J.A., Insect Neurobiology and Hormone Laboratory, Agricultural Research Service, U.S. Department of Agriculture, Beltsville, Maryland, United States
Ecdysone oxidase and 3‐oxoecdysteroid reductases in Manduca sexta: Developmental changes and tissue distribution
The activities of ecdysone oxidase (EO), 3‐oxoecdysteroid 3α‐reductase (3α‐R), and 3‐oxoecdysteroid 3β‐reductase (3β‐R) were determined for epidermis, hemolymph, and fat body of wandering fifth instar Manduca sexta larvae and for midguts of various developmental stages between 3 days after the last larval and 14 days after the pupal ecdysis. The larval midgut was the only organ showing substantial specific activities of EO and 3α‐R, and both increased up to the seventh day after ecdysis. Hemolymph and fat body had only moderate to high 3β‐R and low EO activites, and the epidermis did not contain significant activity of any of the enzymes. On the ninth day after the last larval ecdysis the larval midgut epithelium was replaced by a new pupal midgut epithelium. After this event only 3β‐R was restored to high activities, whereas EO and 3α‐R showed only low to marginal activities. It is concluded that only the larval midgut has a role in the inactivation of ecdysteroids by 3‐epimerization. © 1993 Wiley‐Liss, Inc. Copyright © 1993 Wiley‐Liss, Inc.
Scientific Publication
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