title: Desensitization and recovery of crayfish photoreceptors. Dependency on circadian time, and pigment-dispersing hormone.
abstract: In this work, we studied the characteristics of recovery from desensitization of the light-elicited current of crayfish. Applying a two-flash protocol, we found that the first flash triggers a current that activates with a noticeable latency, reaches a peak value, and thereafter decays along a single exponential time course. In comparison with the first-elicited current, the current elicited by the second flash not only presents an expected smaller peak current, depending on the time between flashes, but it also displays a different latency and decay time constant. Recovery of the first flash values of these current parameters depends on the circadian time at which the experiments are conducted, and on the presence of pigment-dispersing hormone. Our data also suggest the existence of distinctive desensitized states, whose induction depends on circadian time and the presence of pigment-dispersing hormone.
authors: Departamento de Fisiología, Facultad de Medicina, Universidad Nacional Autónoma de México (UNAM), Circuito Interior S/N, Ciudad Universitaria, 04510 Ciudad de México, Mexico.
authors: Carolina
authors: C
authors: Barriga-Montoya
authors: Departamento de Fisiología, Facultad de Medicina, Universidad Nacional Autónoma de México (UNAM), Circuito Interior S/N, Ciudad Universitaria, 04510 Ciudad de México, Mexico.
authors: Araceli
authors: A
authors: de la O-Martínez
authors: Departamento de Fisiología, Facultad de Medicina, Universidad Nacional Autónoma de México (UNAM), Circuito Interior S/N, Ciudad Universitaria, 04510 Ciudad de México, Mexico.
authors: Beatriz
authors: B
authors: Fuentes-Pardo
authors: Departamento de Fisiología, Facultad de Medicina, Universidad Nacional Autónoma de México (UNAM), Circuito Interior S/N, Ciudad Universitaria, 04510 Ciudad de México, Mexico. Electronic address: froylangl@yahoo.com.
authors: Froylán
authors: F
authors: Gómez-Lagunas
mesh_terms: D000465:Algorithms; D000818:Animals; D017756:Aquaculture; D003400:Astacoidea / Q000254:growth & development / Q000502:physiology*; D002940:Circadian Rhythm; D055724:Electrophysiological Phenomena; D005123:Eye; D066298:In Vitro Techniques / Q000662:veterinary; D007447:Invertebrate Hormones / Q000378:metabolism*; D007700:Kinetics; D018978:Molting; D017956:Photoreceptor Cells, Invertebrate / Q000502:physiology*; D011930:Reaction Time
chemical_list: D007447:Invertebrate Hormones; C005973:black pigment dispersing hormone
keywords: Circadian rhythm; Crayfish; Desensitization; Light-elicited current; Membrane adaptation; Pigment-dispersing hormone; Visual photoreceptor