title: Cell signalling during sea urchin development: a model for assessing toxicity of environmental contaminants.
abstract: The early development of sea urchins has been thoroughly studied since the beginning of the 20th century thanks to the particular features of the model involving cell signalling, making it easy to follow the complex cell-to-cell interactions that lead to development. In this chapter, the prominent role of cell-to-cell communication in developmental events is discussed, as well as the role of intracellular ion changes that are in turn regulated by signal molecules belonging to the cholinergic system. The results seem to indicate that the zygote stage is the most suitable to study the role of the cholinergic system, as at this stage, a calcium spike can be evoked by exposure to acetylcholine (ACh) or to muscarinic drugs, at any time before the nuclear breakdown. The described outcomes also open a path to a new way of considering biomarkers. In fact, most environmental factors have the capacity to interfere with the cholinergic system: stress, wounds, inflammation and pollution in general. In particular, this offers a way to investigate the presence in the environment and the degree of aggressiveness of neurotoxic contaminants, such as organophosphate and carbamate pesticides, largely used in European countries for many purposes, including agricultural pest control and medical treatment. These drugs exert their function by interfering with the regulation of the cholinergic system and the consequent electrical events. Thus, the sea urchin zygote could represent a reliable model to be used in biosensors with the capacity to translate the effect of neurotoxic pesticides, and generally of stress-inducing contaminants, in living cell responses, such as electrical responses.
authors.affiliation: Dipartimento di Biologia Sperimentale, Ambientale ed Applicata (DIBISAA), University of Genoa, Viale Benedetto XV, 16132 Genova, Italy.
authors.forename: C
authors.initials: C
authors.lastname: Angelini
authors.forename: M G
authors.initials: MG
authors.lastname: Aluigi
authors.forename: M
authors.initials: M
authors.lastname: Sgro
authors.forename: S
authors.initials: S
authors.lastname: Trombino
authors.forename: H
authors.initials: H
authors.lastname: Thielecke
authors.forename: C
authors.initials: C
authors.lastname: Falugi
mesh_terms: D000109:Acetylcholine / Q000378:metabolism; D000818:Animals; D015374:Biosensing Techniques; D002450:Cell Communication; D047108:Embryonic Development; D004784:Environmental Monitoring / Q000379:methods*; D004785:Environmental Pollutants / Q000032:analysis* / Q000633:toxicity; D005306:Fertilization; D008954:Models, Biological; D009498:Neurotoxins / Q000378:metabolism; D012617:Sea Urchins / Q000502:physiology*; D015398:Signal Transduction
chemical_list: D004785:Environmental Pollutants; D009498:Neurotoxins; D000109:Acetylcholine