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- W2000584529 abstract "A novel, noninvasive method was developed for microvascular permeability measurements in non-malignant (mature granulation) and neoplastic (VX2 carcinoma) tissues grown in the rabbit ear chamber. Dextran of 150,000 molecular weight, tagged with fluorescein isothiocyanate (FITC), was used as a representative tracer molecule. In vivo plasma concentration of dextran was measured by photometric analysis of the plasma layer of microvessels in the ear chamber. The plasma concentration in both normal and tumor preparations rose rapidly to a steady state with a time constant of 4.06 ± 0.2 sec, and remained relatively constant at that level for the next 2 hr (elimination time constant = 1.77 ± 0.9 × 105 sec). Extravasation of macromolecules from individual microvessels into the extravascular space was measured with the same photometric technique. Interstitial diffusion coefficients and microvascular permeability coefficients were determined by fitting a one-dimensional permeability-diffusion model to the extravasation data. The diffusivity of dextran in tumor interstitium was 2.2 ± 1.4 × 10−8 cm2/sec (n = 6) and in granulation tissue interstitium was 6.7 ± 4.4 × 10−10 cm2/sec (n = 6). Microvascular permeability in tumors was 7.26 ± 3.29 × 10−8 cm/sec (n = 11) and in granulation tissue was 57.24 ± 39.24 × 10−8 cm/sec (n = 10). These results on increased permeability (8-fold; P < 0.002) and increased diffusivity (33-fold; P < 0.001) in tumors provide a rational basis for the use of largemolecular-weight agents in the detection and treatment of solid tumors." @default.
- W2000584529 created "2016-06-24" @default.
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- W2000584529 date "1986-05-01" @default.
- W2000584529 modified "2023-10-16" @default.
- W2000584529 title "Microvascular permeability of normal and neoplastic tissues" @default.
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- W2000584529 doi "https://doi.org/10.1016/0026-2862(86)90018-x" @default.
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