| Autor: |
Sluiters, J. F., Dogterom, G. E. |
| Zdroj: |
Parasitology Research; July 1984, Vol. 70 Issue: 4 p485-489, 5p |
| Abstrakt: |
Oviposition does not start in the hermaphrodite gastropodLymnaea stagnalis if it is infected withTrichobilharzia ocellata when juvenile. Ovulation and oviposition are induced by the gonadotropic hromone CDCH, produced by paired groups of neuroendocrine caudodorsal cells (CDC) located in the cerebral ganglia of the snail. CDCH can be extracted from the neurohaemal area of the CDC, the cerebral commissure (COM), and assayed by a rapid in vivo procedure. In this bioassay CDCH activity was found after injection of COM extracts prepared from infected donor snails, but these COMs contained a smaller amount of CDCH. Parasitized recipient animals in the assay did not respond to CDCH injections, indicating that the mechanism involved in ovulation was unable to react to CDCH. The absence of reactivity of the targets to CDCH and the smaller amount of CDCH in COMs of infected snails might both be caused by incomplete maturity of the CDC and the targets of CDCH in infected snails. Since the maturity of the female reproductive organs is controlled by the female gonadotropic dorsal body hormone (DBH), it is suggested that the parasites intervene at the level of the reactivity of the targets to DBH. |
| Databáze: |
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