PMID: 11914386Mar 27, 2002Paper

Lipophorin-facilitated hydrocarbon uptake by oocytes in the German cockroach Blattella germanica (L.)

The Journal of Experimental Biology
Yongliang FanC Schal

Abstract

Large amounts of hydrocarbons accumulate during vitellogenesis in the developing basal oocytes of the German cockroach Blattella germanica (L.), and all ovarian hydrocarbons are deposited into an egg case (ootheca) during oviposition. Hydrocarbons are not synthesized by the ovaries, but are delivered by hemolymph lipoproteins and accumulate within the basal oocytes. A native B. germanica hydrocarbon, [(3)H]3,11-dimethylnonacosane, injected into adult females of various ages, was taken up by the ovaries in relation to oocyte growth. Ovarian uptake of the hydrocarbon was low in day 0-1 females, increased dramatically between days 3 and 6 and declined sharply through oviposition on day 8-9; ovarian uptake of the hydrocarbon was low during a 21-day pregnancy that followed. [1-(14)C]Propionate, which becomes incorporated into methyl-branched hydrocarbons, was injected into 5-day-old vitellogenic females to monitor the de novo biosynthesis of hydrocarbons and the time course of hydrocarbon deposition in the ovary. Propionate was rapidly incorporated into hydrocarbons within 4 h. Hydrocarbon uptake by the ovaries, however, was three times higher 24 h after injection than 4 h after injection, showing that hydrocarbons are slowly and co...Continue Reading

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