No evidence of androgenic hormone from the testes of the glowworm, Lampyris noctiluca

Maas, Ulrike; Dorn, August

doi:10.1016/j.ygcen.2005.02.025

Cited by 9 publications

(3 citation statements)

References 27 publications

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“…Th is is an exceptional case among insects as sex hormones are generally considered to be absent. However, similar experiments carried out recently did not alter the sexual phenotype of these insects (Maas and Dorn, 2005 ). Th erefore, the authenticity of hormone-associated masculinization in these insects and its relationship with the sex-determining genes remain unclear.…”

Section: Sex Hormonementioning

confidence: 69%

Gynandromorphs and intersexes: potential to understand the mechanism of sex determination in arthropods

Narita¹,

Pereira²,

Kjellberg³

et al. 2010

Terr Arthropod Rev

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Arthropods are sexually dimorphic. An arthropod individual usually diff erentiates into a male or a female. With very low frequencies, however, individuals with both male and female morphological characters have repeatedly been found in natural and laboratory populations of arthropods. Gynandromorphs (i.e., sexual mosaics) are genetically chimeric individuals consisting of male and female tissues. On the other hand, intersexes are genetically uniform (i.e., complete male, complete female or intermediate in every tissue) but all or some parts of their tissues have either a sexual phenotype opposite to their genetic sex or an intermediate sexual phenotype. Possible developmental processes (e.g., double fertilization of a binucleate egg, loss of a sex chromosome or upregulation/downregulation of sex-determining genes) and causal factors (e.g., mutations, genetic incompatibilities, temperatures or endosymbionts) for the generation of gynandromorphs and intersexes are reviewed and discussed.

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Section: Sex Hormonementioning

confidence: 69%

Gynandromorphs and intersexes: potential to understand the mechanism of sex determination in arthropods

Narita¹,

Pereira²,

Kjellberg³

et al. 2010

Terr Arthropod Rev

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“…Has its counterpart been overlooked in insects? The claim by Naisse (references in De Loof & ) that the firely Lampyris noctiluca has an androgenic hormone, could not be confirmed in recent experiments using similar techniques as Naisse (Maas & Dorn, 2005). Modern techniques are better suited to solve the problem.…”

Section: Discussionmentioning

confidence: 97%

Ecdysteroids: the overlooked sex steroids of insects? Males: the black box

Loof

2006

Insect Science

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The paradigm, still around in textbooks, that ‘in insects sex is strictly genetic, thus that they do not have sex hormones’, is mainly based on a wrong interpretation of the ‘gynandromorph argument’. It is no longer tenable. Given the fact that vertebrates and invertebrates probably had a common, sexually reproducing ancestor, there is no reason to assume that only vertebrates need sex hormones. The major function of sex hormones is to inform the somatoplasm about developmental changes that take place in the gonads. In contrast to juvenile hormone and neuropeptides, ecdysteroids meet all criteria to act as sex hormones, which was probably their ancient role. Their much better documented role in moulting and metamorphosis was a secondary acquisition that enabled arthropods to cope with growth problems, imposed by a rigid cuticle. Female insects use 20‐hydroxyecdysone (20E), secreted by the follicle cells of the ovary, in a similar way as females of egg‐laying vertebrates use estrogens. For a variety of reasons, the possibility that ecdysteroids, in particular ecdysone (E), might also act as sex hormones in male insects, thus as the counterpart of testosterone of vertebrates, has been very much overlooked. Thanks to the recent discovery of the molecular basis of the haploid‐diploid system of sex determination in the honeybee, the characterization of Halloween genes, proteomics, RNAi and so on, it now becomes possible to verify whether in insects, as with vertebrates, males are the endocrinologically default gender form.

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“…Apigenin and luteolin are both closely related to flavonoid IIa , and are both ecdysone antagonists (25). The role of insect steroid sex hormones, such as estrogen, is controversial (26,27); however, flavonoids could also affect insect fertility due to estrogenic activity (28). Apigenin (Fig.…”

Section: Discussionmentioning

confidence: 99%

Isovitexin‐2″‐O‐β‐[6‐O‐E‐p‐coumaroylglucopyranoside] from UV‐B irradiated Leaves of Rice, Oryza sativa L. Inhibits Fertility of Helicoverpa armigera

Caasi-Lit

Tanner

Nayudu

et al. 2007

Photochem & Photobiology

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UV-B irradiated rice leaves (Oryza sativa L.) contained four closely related flavonoids, with either an isoorientin or isovitexin aglycone. These flavonoids have previously been purified and characterized, and were added to artificial diets of the African bollworm (Helicoverpa armigera Hübner) at 0.1x concentration found in irradiated rice leaves. Consumption of different diets had relatively small effects on laval, pupal and adult duration, weight and survival, indicating the insects lived near normal life cycles on all diets. However, one of the compounds, flavonoid IIa, isovitexin-2''-O-beta-[6-O-E-p-coumaroylglucopyranoside], dramatically reduced the number of fertile eggs laid to 7% of control insects (P<0.001) when added to insect diets at 18 nmol gFW(-1) (14 ppm). A similar antifertility effect was observed when only the male partner consumed diet containing flavonoid IIa, indicating that the reduced fertility may be male specific. In contrast, the fecundity and fertility of insects eating diets containing the closely related flavonoids, isoorientin-2''-O-beta-[6-O-E-p-coumaroylglucopyranoside] or isoorientin-2''-O-beta-[6-O-E-p-feruloylglucopyranoside], were not significantly different to control diets.

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No evidence of androgenic hormone from the testes of the glowworm, Lampyris noctiluca

Cited by 9 publications

References 27 publications

Gynandromorphs and intersexes: potential to understand the mechanism of sex determination in arthropods

Gynandromorphs and intersexes: potential to understand the mechanism of sex determination in arthropods

Ecdysteroids: the overlooked sex steroids of insects? Males: the black box

Isovitexin‐2″‐O‐β‐[6‐O‐E‐p‐coumaroylglucopyranoside] from UV‐B irradiated Leaves of Rice, Oryza sativa L. Inhibits Fertility of Helicoverpa armigera

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