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Titolo:
A MODEL FOR INTERPRETING THE LABELING OF INTERENDOTHELIAL CLEFTS BY HIGH MOLECULAR-WEIGHT TRACERS
Autore:
FU BM; CURRY FRE; ADAMSON RH; WEINBAUM S;
Indirizzi:
CUNY CITY COLL,DEPT MECH ENGN NEW YORK NY 10031 CUNY CITY COLL,DEPT MECH ENGN NEW YORK NY 10031 UNIV CALIF DAVIS,SCH MED,DEPT HUMAN PHYSIOL DAVIS CA 95616
Titolo Testata:
Annals of biomedical engineering
fascicolo: 2, volume: 25, anno: 1997,
pagine: 375 - 397
SICI:
0090-6964(1997)25:2<375:AMFITL>2.0.ZU;2-3
Fonte:
ISI
Lingua:
ENG
Soggetto:
FROG MESENTERIC CAPILLARIES; SINGLE PERFUSED CAPILLARIES; FIBER MATRIX MODEL; ENDOTHELIAL GLYCOCALYX; PERMEABILITY; DIFFUSION; TRANSPORT; PROTEINS; JUNCTION; SYSTEM;
Keywords:
FROG MESENTERIC CAPILLARY; JUNCTION STRAND; FIBER MATRIX; ULTRAFILTRATION; HIGH MOLECULAR WEIGHT TRACERS;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
39
Recensione:
Indirizzi per estratti:
Citazione:
B.M. Fu et al., "A MODEL FOR INTERPRETING THE LABELING OF INTERENDOTHELIAL CLEFTS BY HIGH MOLECULAR-WEIGHT TRACERS", Annals of biomedical engineering, 25(2), 1997, pp. 375-397

Abstract

We extended the model describing the low molecular weight electron dense tracer wake in the interendothelial cleft and surrounding tissue to describe the time-dependent transport of intermediate size solutes of 1.0-3.5 nm radius by convection and diffusion in an interendothelialcleft containing a fiber matrix. This model provides a quantitative basis on which to reinterpret electron microscopic studies of the distribution of tracers such as horseradish peroxidase (HRP; molecular weight = 40,000; Stokes radius = 3.0 nm) along the interendothelial cell cleft from the lumen to the tissue. For example, we show that, in contrast to our results with low molecular weight tracers, the wake of large molecular weight tracers on the abluminal side of the junctional strand is not likely to be detected, because the concentration of the tracer is predicted to be very low in most experiments. Thus the lack of a tracer such as HRP on the abluminal side of the junctional strand and in the tissue is not as strong evidence against the presence of a cleft pathway as suggested previously, The model does provide the basis for the design of experiments to locate both the principal molecular sieve and breaks in the junctional strand from the standing gradient onthe luminal side of the junctional strand. An important experimental variable is the pressure in the vessel lumen which can be varied between 0 and 30 cm H2O to change the contributions of diffusive and convective transport to transcapillary exchange through the interendothelialcleft. This approach will also allow the testing of models for transcapillary pathways for large molecules by measuring the distribution offluorescent tracers across the microvessel wall and in the tissue surrounding the microvessel using confocal microscopy.

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Documento generato il 19/09/20 alle ore 08:43:00