Percoll公司
溶血
三磷酸腺苷
红细胞压积
缺氧(环境)
红细胞
红细胞
化学
溶解
血红蛋白
网织红细胞
生物化学
生物物理学
生物
离心
氧气
内科学
内分泌学
免疫学
医学
有机化学
信使核糖核酸
基因
作者
Blake Ferguson,Leslie E. Neidert,Matthew J. Rogatzki,Keith R. Lohse,L. Bruce Gladden,Heidi A. Kluess
出处
期刊:American Journal of Physiology-cell Physiology
[American Physiological Society]
日期:2021-11-01
卷期号:321 (5): C761-C769
被引量:5
标识
DOI:10.1152/ajpcell.00510.2020
摘要
The precise matching of blood flow to skeletal muscle during exercise remains an important area of investigation. Release of adenosine triphosphate (ATP) from red blood cells (RBCs) is postulated as a mediator of peripheral vascular tone in response to shear stress, hypoxia, and mechanical deformation. We tested the following hypotheses: 1) RBCs of different densities contain different quantities of ATP; 2) hypoxia is a stimulus for ATP release from RBCs; and 3) hypoxic ATP release from RBCs is related to RBC lysis. Human blood was drawn from male and female volunteers (n = 11); the RBCs were isolated and washed. A Percoll gradient was used to separate RBCs based on cellular density. Density groups were then resuspended to 4% hematocrit and exposed to normoxia or hypoxia in a tonometer. Equilibrated samples were drawn and centrifuged; paired analyses of ATP (luminescence via a luciferase-catalyzed reaction) and hemolysis (Harboe spectrophotometric absorbance assay) were measured in the supernatant. ATP release was not different among low-density cells versus middle-density versus high-density cells. Similarly, hemoglobin (Hb) release was not different among the red blood cell subsets. No difference was found for either ATP release or Hb release following matched exposure to normoxic or hypoxic gas. The concentrations of ATP and Hb for all subsets combined were linearly correlated (r = 0.59, P ≤ 0.001). With simultaneous probing for Hb and ATP in the supernatant of each sample, we conclude that ATP release from RBCs can be explained by hemolysis and that hypoxia per se does not stimulate either ATP release or Hb release from RBCs.
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