Journal article
Cholesterol turnover and ecdysone content in tissues of normal and de-eyestalked crabs (Cancer antennarius)
The Journal of experimental zoology, Vol.229(3), pp.383-392
03/1984
DOI: 10.1002/jez.1402290306
Abstract
Groups of male intact, premolt and postmolt crabs, and those induced into premolt by de‐eyestalking (DE), were injected with [14C]cholesterol and selected organs were removed 24 hr later. Total as well as labeled cholesterol were measured. Values were corrected for handling loss and for extracellular (inulin) tissue volumes. Gonad had the highest endogenous cholesterol concentration (∼ 3 mg/gm), followed in order by Y organs (∼ 2 mg/gm), hypodermis, hepatopancreas, muscle, and hemolymph. Significant differences between stages for any tissue were no more than 2‐fold. However, specific activity (radioactivity/unit weight total cholesterol) of Y organs in intact premolts was 2‐ to 9‐fold higher than other organs in the same group. Shortly after DE (24 hr), Y organ specific activity was elevated as much as 164‐fold over other tissues of this group, 26 × above premolt Y organs and up to 114 × higher than Y organs of other stages. Qualitatively, similar increases occurred in hepatopancreas after DE and in muscle and hypodermis in early postmolt. The combined data include the demonstration that very rapid turnover of the free cholesterol pool occurs in Y organs in earliest premolt. Further, the large uptake of cholesterol by Y organs occurred against a steep cholesterol gradient, indicating active transport into Y‐organ cells. With the lower detection limit at 20 ng (HPLC), ecdysone was found in all tissues extracted, 20‐hydroxyecdysone only in hemolymph and hepatopancreas. Y organs contained the highest concentrations of ecdysone and contained the hormone in more stages than other tissues. No ecdysone could be detected in Y‐organs 24 hr after DE, but it was accumulated progressively with time to 45 days after DE. Together with the findings on cholesterol, these data indicate that Y organs in early premolt rapidly take up and convert sterol precursor accompanied by equally rapid secretion, without accumulation, of ecdysone. Copyright © 1984 Wiley‐Liss, Inc., A Wiley Company
Details
- Title: Subtitle
- Cholesterol turnover and ecdysone content in tissues of normal and de-eyestalked crabs (Cancer antennarius)
- Creators
- William H Vensel - Department of Zoology, University of Iowa, Iowa City, Iowa 52242Eugene Spaziani - Department of Zoology, University of Iowa, Iowa City, Iowa 52242Lynda S Ostedgaard - Department of Zoology, University of Iowa, Iowa City, Iowa 52242
- Resource Type
- Journal article
- Publication Details
- The Journal of experimental zoology, Vol.229(3), pp.383-392
- Publisher
- Wiley Subscription Services, Inc., A Wiley Company
- DOI
- 10.1002/jez.1402290306
- ISSN
- 0022-104X
- eISSN
- 1097-010X
- Number of pages
- 10
- Language
- English
- Date published
- 03/1984
- Academic Unit
- Internal Medicine
- Record Identifier
- 9984094620402771
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