Linked Life Data

12586503

Source:http://linkedlifedata.com/resource/pubmed/id/12586503

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
1
pubmed:dateCreated
2003-2-14
pubmed:abstractText
Collagen sponges of various biodegradabilities were prepared by dehydrothermal crosslinking at 140 degrees C for different time periods. When the collagen sponges were radioiodinated and implanted subcutaneously into the back of mice, the radioactivity remaining at the implanted site decreased with time; the longer the time of dehydrothermal crosslinking, the slower the radioactivity decrement. The radioactivity following the subcutaneous implantation of collagen sponges incorporating (125)I-labeled transforming growth factor (TGF)-beta1 also decreased with time. The time profile of both the radioactivity remainings was in good accordance to each other, irrespective of the crosslinking time. This indicates that the TGF-beta1 incorporated in the sponges was released as a result of sponge biodegradation. Potential of collagen sponges incorporating 0.1 micro g of TGF-beta1 in repairing the defect of rabbit skulls was evaluated in a stress-unloaded state. Bone repairing was induced by application of the collagen sponges incorporating 0.1 micro g of TGF-beta1 whereas that of free TGF-beta1 at the same dose and TGF-beta1-free, empty collagen sponges were ineffective. The bone defect was histologically closed by the bone tissue newly formed 6 weeks after application. Bone mineral density (BMD) analysis revealed that the collagen sponge incorporating TGF-beta1 enhanced the BMD value at the bone defect to a significantly great extent compared with other agents. A maximum enhancement of BMD was observed for the collagen sponge incorporating TGF-beta1 which was prepared by dehydrothermal crosslinking for 6 h. It was concluded that the TGF-beta1 incorporated in the collagen sponge was released in a biologically active form as a result of sponge biodegradation, resulting in enhanced bone repairing at the skull defect. It is possible that for too slowly degraded sponges, the remaining physically impairs the bone repairing at the skull defect. Induction of bone repairing would not be achieved through a rapid release of TGF-beta1 from too fast-degraded sponge.
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Feb
pubmed:issn
0168-3659
pubmed:author
pubmed:issnType
Print
pubmed:day
14
pubmed:volume
88
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
55-64
pubmed:dateRevised
2007-11-15
pubmed:meshHeading
pubmed:year
2003
pubmed:articleTitle
Repairing of rabbit skull defect by dehydrothermally crosslinked collagen sponges incorporating transforming growth factor beta1.
pubmed:affiliation
Institute for Frontier Medical Sciences, Kyoto University, 53 Kawahara-cho Shogoin, Sakyo-ku, Kyoto 606-8507, Japan.
pubmed:publicationType
Journal Article, Research Support, U.S. Gov't, Non-P.H.S.