Document Detail

Intercellular recognition: quantitation of initial binding events.
MedLine Citation:
PMID:  6946443     Owner:  NLM     Status:  MEDLINE    
The hypothesis that intercellular adhesion can be subdivided into two separable phenomena--an initial recognition event and a subsequent stabilization--is supported by the use of a cell binding assay that provides a quantitative measure of intercellular binding strengths. Radioactive single cells are brought into contact with cell monolayers at 4 degrees C in sealed compartments. The compartments are inverted and a centrifugal force is then applied to dislodge the probe cells from the monolayers. By varying the speed of centrifugation, the force maintaining associations between embryonic chicken neural retina cells was determined to be on the order of 10(-5) dyne. Topographic specificities of single neural retina cells for retinal monolayers from various regions of the retina were detected with this assay and corresponded to those observed in more traditional assays at 37 degrees C. Also observed were two time- and temperature-dependent stabilization processes in which the force required for dislodgment increased. One of the stabilization processes was sensitive to dinitrophenol and was inactive at 4 degrees C; the second was still active in metabolically blocked cells. The metabolic-dependent process resulted in interactions at least 13 times as strong as the initial binding. The metabolic-independent process resulted in about a 2-fold increase in binding strength and had a temperature dependence similar to that of membrane diffusional phenomena.
D R McClay; G M Wessel; R B Marchase
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Publication Detail:
Type:  Journal Article; Research Support, U.S. Gov't, P.H.S.    
Journal Detail:
Title:  Proceedings of the National Academy of Sciences of the United States of America     Volume:  78     ISSN:  0027-8424     ISO Abbreviation:  Proc. Natl. Acad. Sci. U.S.A.     Publication Date:  1981 Aug 
Date Detail:
Created Date:  1982-01-20     Completed Date:  1982-01-20     Revised Date:  2009-11-18    
Medline Journal Info:
Nlm Unique ID:  7505876     Medline TA:  Proc Natl Acad Sci U S A     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  4975-9     Citation Subset:  IM    
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MeSH Terms
Calcium / pharmacology
Cell Aggregation* / drug effects
Centrifugation / methods
Chick Embryo
Concanavalin A / pharmacology
Retina / cytology*
Trypsin / pharmacology
Grant Support
Reg. No./Substance:
11028-71-0/Concanavalin A; 7440-70-2/Calcium; EC

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

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