The lung as a metabolic organ.

Abstract:

:Recently, the lung has received increasing attention as a metabolic organ. In this role, the lung modulates the composition of the arterial blood by several mechanisms: removing active substances from the plasma, releasing substances into the plasma, temporarily holding substances from circulation, and activating or inactivating substances that pass through the lungs. In this report, the procedures proposed by different investigators for in vivo noninvasive assessment of the lung metabolic functions are reviewed. Most procedures are based on an estimation of the clearance of plasma amines by the lung endothelial cells. This clearance is assessed by measuring the lung uptake or the extraction fraction of an intravenously (IV) injected radiolabeled amine. Our own procedure, which assesses the number of free pulmonary endothelial amine receptors, is discussed in detail. In our procedure, the number of receptors was computed using the number of injected molecules of amine and determining the lung extraction fraction of the amine during its first pass through the lungs. In goats, using N-isopropyl-p-iodoamphetamine labeled with 123I as the radiopharmaceutical, the total number of endothelial lung amine receptors was found to be 1.589 X 10(20). The methods for studying the lung metabolic functions, which are discussed in this report can be applied in humans to evaluate either physiological or pathological conditions.

journal_name

Semin Nucl Med

authors

Touya JJ,Rahimian J,Corbus HF,Grubbs DE,Savala KM,Glass EC,Bennett LR

doi

10.1016/s0001-2998(86)80016-2

subject

Has Abstract

pub_date

1986-10-01 00:00:00

pages

296-305

issue

4

eissn

0001-2998

issn

1558-4623

pii

S0001-2998(86)80016-2

journal_volume

16

pub_type

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