Mutual interactions between optic lobe circadian pacemakers in the cricket Gryllus bimaculatus

1991 ◽  
Vol 169 (3) ◽  
Author(s):  
Kenji Tomioka ◽  
Kenji Yamada ◽  
Shinya Yokoyama ◽  
Yoshihiko Chiba
Keyword(s):  
Optic Lobe ◽  
Gryllus Bimaculatus ◽  
Circadian Pacemakers

Serotonin sets the day state in the neurons that control coupling between the optic lobe circadian pacemakers in the cricketGryllus bimaculatus

2002 ◽  
Vol 205 (9) ◽  
pp. 1305-1314 ◽  
Author(s):  
A. S. M. Saifullah ◽  
Kenji Tomioka
Keyword(s):  
Neural Activity ◽  
Receptor Agonist ◽  
Serotonin Receptor ◽  
Optic Lobe ◽  
Neural Pathway ◽  
Gryllus Bimaculatus ◽  
Dependent Inhibition ◽  
Serotonin Receptor Antagonist ◽  
Time Dependent Inhibition ◽  
Circadian Pacemakers

SUMMARYThe bilaterally paired optic lobe circadian pacemakers of the cricket Gryllus bimaculatus mutually exchange photic and circadian information to keep their activity synchronized. The information is mediated by a neural pathway, consisting of the so-called medulla bilateral neurons,connecting the medulla areas of the two optic lobes. We investigated the effects of serotonin on the neural activity in this coupling pathway. Spontaneous and light-induced electrical activity of the neurons in the coupling pathway showed daily variations, being more intense during the night than the day. Microinjection of serotonin or a serotonin-receptor agonist,quipazine, into the optic lobe caused a dose- and time-dependent inhibition of spontaneous and light-induced responses, mimicking the day state. The amount of suppression was greater and the recovery from the suppression occurred faster during the night. Application of metergoline, a non-selective serotonin-receptor antagonist, increased spontaneous activity and light-evoked responses during both the day and the night, with higher effect during the day. In addition, metergoline effectively attenuated the effects of serotonin. These facts suggest that in the cricket's optic lobe, serotonin is released during the daytime and sets the day state in the neurons regulating coupling between the bilaterally paired optic lobe circadian pacemakers.

Gb’Clock Is Expressed in the Optic Lobe and Is Required for the Circadian Clock in the Cricket Gryllus bimaculatus

2012 ◽  
Vol 27 (6) ◽  
pp. 467-477 ◽  
Author(s):  
Yoshiyuki Moriyama ◽  
Yuichi Kamae ◽  
Outa Uryu ◽  
Kenji Tomioka
Keyword(s):  
Circadian Clock ◽  
Optic Lobe ◽  
Gryllus Bimaculatus
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