Linked Life Data

7983169

Source:http://linkedlifedata.com/resource/pubmed/id/7983169

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:dateCreated
1995-1-4
pubmed:abstractText
Amoebae of Physarum polycephalum exhibit chemotactic responses to glucose and to cAMP. The chemotaxing amoebae exhibit alternating locomotive movements: relatively linear locomotion and movements that change the direction of the locomotion. Such locomotive activity is tightly coupled with the changes in the number and the positions of the pseudopods; cells have one pseudopod at the leading edge during their linear locomotion, while they have multiple pseudopods when they are changing the direction of locomotion. Treatment of cells with microtubule-disrupting reagents inhibited the chemotaxis of the cells. To characterize the role of the microtubule system in chemotaxis, we quantitatively analyzed the relationship between the positions of multiple pseudopods of the amoebae and the relative stability of the pseudopods during reorientation. No significant differences were observed in the pseudopod dynamics between the untreated and the treated amoebae. In both cases, one pseudopod at the leading edge continued to expand during linear locomotion. It then split into two to three pseudopods in the reorientation phase, and the positions of the multiple pseudopods were random. Among multiple pseudopods, however, the pseudopods closer to the microneedle tip were selectively stabilized more often than those distant from the tip in the presence of the microtubule system. By contrast, such preferential stabilization of the appropriate pseudopods was completely abolished by microtubule inhibitors. The microtubule-dependent selection of appropriately located pseudopods enables amoebae to turn correctly at the reorientation step.
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Aug
pubmed:issn
0021-9533
pubmed:author
pubmed:issnType
Print
pubmed:volume
107 ( Pt 8)
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
2071-9
pubmed:dateRevised
2006-11-15
pubmed:meshHeading
pubmed:year
1994
pubmed:articleTitle
Microtubules are required in amoeba chemotaxis for preferential stabilization of appropriate pseudopods.
pubmed:affiliation
Department of Biology, College of General Education, Osaka University, Japan.
pubmed:publicationType
Journal Article, Research Support, Non-U.S. Gov't