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Calcium-induced asymmetrical beating of triton-demembranated sea urchin sperm flagella.
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MedLine Citation:
PMID:  479307     Owner:  NLM     Status:  MEDLINE    
Asymmetrical bending waves can be obtained by reactivating demembranated sea urchin spermatozoa at high Ca2+ concentrations. Moving-film flash photography shows that asymmetrical flagellar bending waves are associated with premature termination of the growth of the bends in one direction (the reverse bends) while the bends in the opposite direction (the principal bends) grow for one full beat cycle, and with unequal rates of growth of principal and reverse bends. The relative proportions of these two components of asymmetry are highly variable. The increased angle in the principal bend is compensated by a decreased angle in the reverse bend, so that there is no change in mean bend angle; the wavelength and beat frequency are also independent of the degree of asymmetry. This new information is still insufficient to identify a particular mechanism for Ca2+-induced asymmetry. When a developing bend stops growing before initiation of growth of a new bend in the same direction, a modification of the sliding between tubules in the distal portion of the flagellum is required. This modification can be described as a superposition of synchronous sliding on the metachronous sliding associated with propagating bending waves. Synchronous sliding is particularly evident in highly asymmetrical flagella, but is probably not the cause of asymmetry. The control of metachronous sliding appears to be unaffected by the superposition of synchronous sliding.
C J Brokaw
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Publication Detail:
Type:  Journal Article; Research Support, U.S. Gov't, P.H.S.    
Journal Detail:
Title:  The Journal of cell biology     Volume:  82     ISSN:  0021-9525     ISO Abbreviation:  J. Cell Biol.     Publication Date:  1979 Aug 
Date Detail:
Created Date:  1979-11-21     Completed Date:  1979-11-21     Revised Date:  2009-11-18    
Medline Journal Info:
Nlm Unique ID:  0375356     Medline TA:  J Cell Biol     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  401-11     Citation Subset:  IM    
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MeSH Terms
Calcium / pharmacology*
Cell Membrane / drug effects
Models, Biological
Polyethylene Glycols / pharmacology
Sea Urchins
Sperm Motility / drug effects
Sperm Tail / drug effects,  physiology
Spermatozoa / drug effects*,  physiology
Reg. No./Substance:
0/Polyethylene Glycols; 7440-70-2/Calcium

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

Full Text
Journal Information
Journal ID (nlm-ta): J Cell Biol
ISSN: 0021-9525
ISSN: 1540-8140
Publisher: The Rockefeller University Press
Article Information
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Print publication date: Day: 1 Month: 8 Year: 1979
Volume: 82 Issue: 2
First Page: 401 Last Page: 411
ID: 2110463
Publisher Id: 80006820
PubMed Id: 479307

Calcium-induced asymmetrical beating of triton-demembranated sea urchin sperm flagella

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