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In vitro studies on the sexual maturation of the bovine lungworm Dictyocaulus viviparus during the development of preadult larvae to adult worms

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Abstract

The bovine lungworm Dictyocaulus viviparus is one of the most important parasites in grazing cattle. However, not much is known about morphology and molecular aspects of sexual maturation occurring during development of preadult larvae (L5) to adults. Since studies in the pulmonary compartments are infeasible, an in vitro cultivation method was established. The study was conducted with L5 during in vitro cultivation, assessing longitudinal growth and sexual maturation. Best results were achieved with RPMI-1640 medium with l-glutamine, 50% fetal bovine serum, amphotericin B (0.25 mg/ml), penicillin (10,000 U/ml), and streptomycin (10 mg/ml) at 39°C and 5% atmospheric CO2. During cultivation, individuals grew from an average length of 4.64 to 9.88 mm independent of their density per setup. Regarding sexual maturation, female individuals started to lay eggs, whereas the testes of male individuals were filled with spermatozoa. Consequently, adult female and adult male worms developed. However, no copulation was observable and eggs did not embryonate. Development was further investigated by quantitative real-time PCR transcriptional analysis of major sperm protein (msp) and vitellogenin (vit) representing male and female sexual development, respectively. Male msp transcription peaked after 5 days of cultivation [corresponding to 20 days post infection (dpi)] and decreased gradually afterwards. Female vit transcription showed the highest rate after 15 days of cultivation (30 dpi), however it never reached the transcription rate in female adults isolated from the host. All in all, the present study gives not only insights into morphological differentiation but provides data lightening molecular aspects of sexual maturation in D. viviparus.

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Acknowledgments

The authors want to thank Anja Heckeroth from Intervet Innovation GmbH, Schwabenheim, for kindly providing the PNGM medium.

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Correspondence to Christina Strube.

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Laabs, EM., Schnieder, T. & Strube, C. In vitro studies on the sexual maturation of the bovine lungworm Dictyocaulus viviparus during the development of preadult larvae to adult worms. Parasitol Res 110, 1249–1259 (2012). https://doi.org/10.1007/s00436-011-2622-y

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  • DOI: https://doi.org/10.1007/s00436-011-2622-y

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