Nematode reproductive and ingestive responses to helminth and host chemical stimuli.

摘要: Current knowledge of the involvement chemical stimuli in reproductive and ingestive physiology zooparasitic nematodes is reviewed. The habitat nematodes, coupled with their sensory reduction, indicates that may modulate most aspects behavioral physiology. Nematodes respond to feeding status host so helminth's pharyngeal pumping, site selection, sexual activity be altered. Biogenic amines from host, such as histamine, dopamine, or serotonin, synchronize helminth ingestion. Octopamine, which released by depresses ingestion male, but not female, worms. also regulate ovipositioning female helminths. release pheromones enable precopulatory location a mate. male activated both components female's pheromone while movement probably arrested male-produced chemicals. Continuation spectral analyses allow future identification pheromone. male's receptor binds lectin specific for mannose residues. Host immunity alters behavior nematodes. Ingestion depressed serum, particularly IgG1, infected animals. Similar results occur after immunization noninfected hosts. Immune serum has no effect on communication between sexes helminth, ovipositional Exploitation these signals helminths' responses novel techniques disease control.