Linked Life Data

1637781

Source:http://linkedlifedata.com/resource/pubmed/id/1637781

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
1
pubmed:dateCreated
1992-8-31
pubmed:abstractText
Due to rapid clearance of interleukin-2 (IL-2), it has had limited effective use as an in vivo immunostimulant. Current experimental and clinical protocols generally must utilize large doses, multiple injections, or continuous infusions of IL-2 in order to achieve significant immunostimulation, often at the expense of systemic toxicity. Therefore, the pharmacodynamics of IL-2 liposomes were investigated. IL-2 liposome incorporation efficiency was 80.4% (SD 5.5); vesicle diameter was 1.65 microns (SD 0.09) as determined by fluorescence-activated cell sorting (FACS). Both formulation (free cytokine vs. IL-2 liposomes) and route of administration were important variables in determination of the biodistribution and pharmacokinetic characteristics of IL-2. When free [125I]IL-2 was given i.v. to mice, only 6.5% was in the blood and 3% in liver and spleen 2 h after injection; on the other hand, at 2 h greater than 70% of i.v. [125I]IL-2 liposomes were detected in the blood, liver, spleen, and lungs. Mean i.v. elimination t1/2 from the blood of rats given 20 x 10(6) U/kg free cytokine or IL-2 liposomes was 41 versus 102 min, respectively, as measured by bioassay and 59 and 119 min as measured by enzyme immunoassay (EIA). After i.v. administration, the estimated Vd of IL-2 liposomes was 13-fold smaller than the free cytokine. Intrathoracic (i.tx.), i.p., and s.c. administration of [125I]IL-2 to mice also demonstrated significant depot effects when IL-2 was incorporated into liposomes. These data suggest IL-2 liposomes may provide in vivo immunostimulation superior to the free cytokine due to biodistribution and depot characteristics.
pubmed:grant
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Jul
pubmed:issn
1053-8550
pubmed:author
pubmed:issnType
Print
pubmed:volume
12
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
19-31
pubmed:dateRevised
2008-3-18
pubmed:meshHeading
pubmed:year
1992
pubmed:articleTitle
Depot characteristics and biodistribution of interleukin-2 liposomes: importance of route of administration.
pubmed:affiliation
Department of Pediatrics, University of Minnesota, Minneapolis 55455.
pubmed:publicationType
Journal Article, Research Support, U.S. Gov't, P.H.S., Research Support, Non-U.S. Gov't