Evaluation of teratocyte functions: An overview

Dahlman, D. L.

doi:10.1002/arch.940130303

Cited by 93 publications

(39 citation statements)

References 42 publications

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“…The third is the fragility of the particles in the standard buffers, salts, detergents and fixatives used for virus purification. This fragility may be caused by the proteases present in the parasitized nymphs and secreted by the wasp larvae and their teratocytes during development (Dahlman, 1990). However, the purified particles remain infectious, so it is likely that plating particles onto the carbon grids used for TEM might also cause some degradation.…”

Section: Discussionmentioning

confidence: 99%

Particle and genomic characteristics of a new member of the Ascoviridae: Diadromus pulchellus ascovirus.

Bigot¹,

Rabouille²,

Sizaret³

et al. 1997

Journal of General Virology

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A new member of the family Ascoviridae, Diadromus pulchellus ascovirus (DpAV), has been found in the lepidopteran nymphs of Acrolepiopsis assectella parasitized by the hymenopteran wasp Diadromus pulchellus. Virions have the standard features of the ascovirus group ; each particle is about 220 nm long and 150 nm wide. They are multilayered, with two clear 7-nm-thick outer layers and one 15-nm-thick inner layer surrounding an electron-dense core (155i110 nm). However, the flattened rice-grain shape and fragility of the DpAV particles are unlike

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Section: Discussionmentioning

confidence: 99%

Particle and genomic characteristics of a new member of the Ascoviridae: Diadromus pulchellus ascovirus.

Bigot¹,

Rabouille²,

Sizaret³

et al. 1997

Journal of General Virology

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“…Although in some hymenopteran parasitoids teratocytes may have functions other than parasitoid nutrition (e.g. host immunosupression, host growth regulation) (Dahlman 1990 ), it was found by Ogloblin (1924) that in D. coccinellae the major function of teratocytes is to provide food for the developing parasitoid larva. More recently, characterized a specifi c polypeptide synthesized by the teratocytes from amino acids absorbed from the host haemolymph.…”

Section: Larval N Utritionmentioning

confidence: 99%

Natural Enemies of Ladybird Beetles

Ceryngier

Roy

Poland

2012

Ecology and Behaviour of the Ladybird Beetles (Coccinellidae)

114

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“…These cells are liberated into the host hemolymph when the parasitoid larva hatches [ l l ] and have been suggested to play trophic, immunosuppressive, and secretory roles [12,13]. In a previous study [14], we found that pupation was prevented when nonparasitized Heliothis virescens larvae were injected with Microplitis croceipes teratocytes.…”

Section: Introductionmentioning

confidence: 96%

Juvenile hormone esterase activity and ecdysteroid titer in Heliothis virescens larvae injected with Microplitis croceipes teratocytes

Zhang

Dahlman

Gelman

1992

Arch Insect Biochem Physiol

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Juvenile hormone esterase (JHE) activity in the hemolymph of 5th-instar Heliothis virescens larvae injected with Microplitis croceipes teratocytes was inversely related to the number of teratocytes injected. JHE activity in the hemolymph of larvae injected with 750 3-day-old teratocytes (the approximate number from one parasitoid embryo) was depressed to less than 5% of those levels found in control larvae. During the latter portion of the digging stage and in the burrowing-digging (BD) stage JHE activity in larvae treated with 350 teratocytes was approximately 40% of control values. However, injection of 180 teratocytes did not significantly affect JHE titers. Two-day-old teratocytes caused the greatest reduction in JHE titer with decreasing effects observed with injections of 3-to 6-day-old teratocytes. Nevertheless, because 2-day-old teratocytes were difficult to separate from host hemocytes, 3-day-old teratocytes were used in most of these studies. Injections of nonparasitired H. virescens hemolymph plasma, Micrococcus lureus bacterial cell walls, washed M. croceipes eggs, or teratocytes from Coresia congregata did not depress JHE titers. Teratocyte injections also significantly reduced growth of host fat body. Ecdysteroid titers in cell formation, day 2 (CF2) larvae injected as new 5th instars with 350 3-day-old teratocytes failed to increase, as compared to noninjected and saline-injected controls. An injection of 1 pg/larva of 20-hydroxyecdysone at the BD stage permitted normal pupation in 50% of the teratocyte-treated larvae as compared to 0% pupation for teratocyte-treated control larvae not treated with 20-hydroxyecdysone. Teratocytes seem to be responsible for the inhibition of JHE release and thus indirectly impact on ecdysteroid titers. o 1992 ~i~e y -L i s s , Inc.

show abstract

Evaluation of teratocyte functions: An overview

Cited by 93 publications

References 42 publications

Particle and genomic characteristics of a new member of the Ascoviridae: Diadromus pulchellus ascovirus.

Particle and genomic characteristics of a new member of the Ascoviridae: Diadromus pulchellus ascovirus.

Natural Enemies of Ladybird Beetles

Juvenile hormone esterase activity and ecdysteroid titer in Heliothis virescens larvae injected with Microplitis croceipes teratocytes

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