Document Detail


Drosophila flies combine periodic heartbeat reversal with a circulation in the anterior body mediated by a newly discovered anterior pair of ostial valves and 'venous' channels.
MedLine Citation:
PMID:  17951411     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
Heartbeat activity in tethered adult drosophilids was recorded using a linear optosensor chip and an IR-light beam. Recording from two to five sensor elements within 250 mum along the anterior heart, it was possible to analyze periodic reversals. In intact Drosophila melanogaster and D. hydei, longer anterograde pulse periods with lower pulse rates generally alternated with shorter retrograde pulse periods having higher pulse rates. These differences are dependent on heart anatomy: a newly discovered first pair of ostia is connected to bilateral thoraco-abdominal hemolymph channels. These channels are part of a venous space separated from the abdominal hemocoel by a septum, consisting of a metanotal ridge and the pericardial diaphragm lined by a special form of fat body. The channels are sealed, and their lumen is possibly controlled by the metathoracic tergo-pleural muscle. During retrograde pulses, the heart chamber works like a suction pump, aspiring hemolymph through the first ostia from the venous channels and discharging it through a newly described caudal opening. During forward beating, the anterior chamber receives hemolymph via all inflow ostia from the entire heart and drives it like a pressure pump through the narrow aorta. Also, during forward pulses, a lateral circulation occurs in the thorax as a result of the venous supply. Inhibition of abdominal mobility leads to an irregular heart rate, with pulse-wise alternating heartbeat reversals. The possible involvement of slow abdominal movements in heartbeat periodicity is discussed. The heartbeat periods are superimposed with intermittent bouts of abdominal pumping movements.
Authors:
Lutz T Wasserthal
Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  The Journal of experimental biology     Volume:  210     ISSN:  0022-0949     ISO Abbreviation:  J. Exp. Biol.     Publication Date:  2007 Nov 
Date Detail:
Created Date:  2007-10-22     Completed Date:  2008-01-17     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0243705     Medline TA:  J Exp Biol     Country:  England    
Other Details:
Languages:  eng     Pagination:  3707-19     Citation Subset:  IM    
Affiliation:
Institute of Biology, University of Erlangen-Nuernberg, Staudtstrasse 5, D-91058 Erlangen, Germany. ltwthal@biologie.uni-erlangen.de
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MeSH Terms
Descriptor/Qualifier:
Abdomen / physiology
Animals
Blood Circulation / physiology*
Drosophila / anatomy & histology,  physiology*,  ultrastructure
Drosophila melanogaster / anatomy & histology,  physiology,  ultrastructure
Heart / anatomy & histology*
Heart Valves / anatomy & histology,  ultrastructure
Hemolymph / physiology
Myocardium / ultrastructure
Pulse

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


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