Linked Life Data

2117177

Source:http://linkedlifedata.com/resource/pubmed/id/2117177

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:dateCreated
1990-9-20
pubmed:abstractText
Human albumin microspheres (99mTc-HAM; 7-25 microns) and spherocytes (99mTc-S; 4-4.5 mu) are particles used for lung mucociliary clearance (MCC) measurements. If radiolabelled HAM aerosols are sent through an airway model to a screen, they appear peripherally distributed, whereas S present a more central and homogeneous distribution. The radioscanning evaluation of particle sedimentation in saline-filled tubes shows quite a different behavior pattern for S, HAM, and surfactant-coated HAM (S-C HAM). In these experimental conditions, S-C HAM and HAM floating properties were better than those of S. This could be explained by physical-chemical factors. Looking for the fate of organic particles after inhalation, we performed multiple bronchial biopsies in seven bronchitic patients, 2 h following inhalation of HAM and S. Scanning electron microscopy revealed that most of S was floating on the mucus layer, while HAM appeared deeply imbedded inside the mucus and partially digested. The same study performed on three bronchitic patients after S-C HAM inhalation, shows that S-C HAM float like S. In vitro, the time-course of tryptic digestion is similar for HAM and for S. However, in vivo, the different location of each particle on the bronchial surface might lead to a different digestion by trypsin and by PZ-peptidase, which are dosable in pathologic mucus. In our opinion, if HAM are coated with surfactant, this should improve the mucus-HAM interaction, thus helping to control variability in lung radioaerosol MCC studies.
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:issn
0341-2040
pubmed:author
pubmed:issnType
Print
pubmed:volume
168 Suppl
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
665-71
pubmed:dateRevised
2006-11-15
pubmed:meshHeading
pubmed:year
1990
pubmed:articleTitle
Fate of human albumin microsphere and spherocyte radioaerosols in the human tracheobronchial tree.
pubmed:affiliation
Pulmonary Division, University of Perugia, Italy.
pubmed:publicationType
Journal Article, Research Support, Non-U.S. Gov't