Linked Life Data

9882473

Source:http://linkedlifedata.com/resource/pubmed/id/9882473

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
2
pubmed:dateCreated
1999-2-3
pubmed:abstractText
Axonal interactions, which are mediated by cell adhesion molecules (CAMs) as well as other types of membrane proteins, are important for sensory axon pathfinding in the developing chick hindlimb. We have previously shown that injection of antibodies that block the function of either G4/L1 or N-cadherin into the limb, starting when the first sensory axons reach the plexus, alters the segmental pattern of projections along cutaneous nerves. Specific removal of polysialic acid from NCAM using the enzyme endoneuraminidase N (Endo N) also resulted in significant changes in cutaneous projection patterns, while injection of antibodies against NCAM itself had no obvious effect (M. G. Honig and U. S. Rutishauser, 1996, Dev. Biol. 175, 325-337). To help understand the cellular basis for these findings, we developed a tissue culture system in which the axons from dorsal root ganglion explants grow within defined laminin lanes and examined whether the same treatments increased or decreased a growth cone's tendency to be closely associated with neighboring axons. After 2 days in culture, images of the cultures were recorded, antibodies or Endo N was added, and images of the same fields were recaptured an hour later. To quantify the results, growth cones located in defined regions of the laminin lanes were classified, before and after the perturbation, as "free" (i.e., growing primarily on the laminin substratum), "fasciculated" (i.e., growing tightly along other neurites), or "intermediate" (i.e., growing both on the laminin substratum and in contact with other neurites). We found that anti-G4/L1 and anti-N-cadherin, but not anti-NCAM, caused an increase in defasciculated growth cones, whereas Endo N resulted in an increase in fasciculated growth cones. These changes in fasciculation are consistent with the changes in cutaneous projections seen in our previous in ovo perturbations. The results from these tissue culture experiments thus provide strong support for the idea that one mechanism by which CAMs affect sensory axon pathfinding in vivo is by regulating the affinity of sensory growth cones for neighboring axons, which in turn can modulate the growth cone's ability to navigate through the surrounding environment.
pubmed:grant
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Dec
pubmed:issn
0012-1606
pubmed:author
pubmed:copyrightInfo
Copyright 1998 Academic Press.
pubmed:issnType
Print
pubmed:day
15
pubmed:volume
204
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
317-26
pubmed:dateRevised
2007-11-14
pubmed:meshHeading
pubmed:year
1998
pubmed:articleTitle
In vitro studies of growth cone behavior support a role for fasciculation mediated by cell adhesion molecules in sensory axon guidance during development.
pubmed:affiliation
Department of Anatomy and Neurobiology, University of Tennessee College of Medicine, Memphis, Tennessee, 38163, USA. mhonig@utmem1.utmem.edu
pubmed:publicationType
Journal Article, Research Support, U.S. Gov't, P.H.S.