Document Detail

Daily variations in crustacean hyperglycaemic hormone and serotonin immunoreactivity during the development of crayfish.
MedLine Citation:
PMID:  11222126     Owner:  NLM     Status:  MEDLINE    
The present study investigated changes in crustacean hyperglycaemic hormone (CHH) and serotonin (5-hydroxytryptamine, 5-HT) immunoreactivity in the retina and the X-organ/sinus gland complex (XO-SG) of the crayfish Procambarus clarkii at two developmental stages, post-embryonic stage two (PO2) and the juvenile stage, at three different times of day, under a photoperiod cycle of 12 h:12 h L:D, using qualitative and quantitative immunohistochemical methods. In the retina, CHH immunoreactivity is located in the tapetal cells, while 5-HT immunoreactivity is found in the retinular cells. In the XO-SG, CHH-immunoreactivity is localized to the CHH-producing cell perikarya and in their axons and endings in the sinus gland, while 5-HT immunoreactivity is restricted to axon endings branching into the perikarya of the CHH-producing cells. A stereological analysis demonstrates that the PO2 and juvenile stages show significant differences in the amount of the immunoreactive CHH and 5-HT material at the three selected time points, indicating daily and related changes in the levels of CHH and 5-HT in the XO-SG and the retina. Our findings therefore support the idea that daily rhythms in the secretory activity of the XO-SG complex affect the circadian sensitivity of the eye. Furthermore, the differences found between the PO2 and juvenile stages suggest that both CHH and 5-HT are key factors in the development of the circadian rhythm of retinal sensitivity.
E G Escamilla-Chimal; F Van Herp; M L Fanjul-Moles
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  The Journal of experimental biology     Volume:  204     ISSN:  0022-0949     ISO Abbreviation:  J. Exp. Biol.     Publication Date:  2001 Mar 
Date Detail:
Created Date:  2001-03-06     Completed Date:  2001-05-31     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  0243705     Medline TA:  J Exp Biol     Country:  England    
Other Details:
Languages:  eng     Pagination:  1073-81     Citation Subset:  IM    
Laboratorio de Neurofisiología Comparada, Facultad de Ciencias, Universidad Nacional Autónoma de México, Ap. Postal 41-630, CP 11000 México DF, México.
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MeSH Terms
Astacoidea / growth & development*,  metabolism
Circadian Rhythm*
Microscopy, Confocal
Nerve Tissue Proteins / analysis*
Retina / chemistry
Serotonin / analysis*
Reg. No./Substance:
0/Nerve Tissue Proteins; 0/hyperglycemic hormone, crustacean; 50-67-9/Serotonin

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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