文献类型：期刊文献

英文题名：Role of the plasma membrane ROS-generating NADPH oxidase in CD34⁺ progenitor cells preservation by hypoxia

作者：Fan, Jinli; Cai, Haibo; Tan, Wen-Song

机构：[1]E China Univ Sci & Technol, State Key Lab Bioreactor Engn, Shanghai 200237, Peoples R China

年份：2007

卷号：130

期号：4

起止页码：455

外文期刊名：JOURNAL OF BIOTECHNOLOGY

收录：;WOS:【SCI-EXPANDED(收录号:WOS:000248693000016)】；

语种：英文

外文关键词：CD34(+) hematopoietic stem and progenitor cells (HSPCs); hypoxia; ex vivo expansion; reactive oxygen species (ROS); cord blood; NADPH oxidase

摘要：Hypoxia favored the preservation of progenitor characteristics of hematopoietic stem and progenitor cells (HSPCs) in bone marrow. This work aimed at studying the role of reactive oxygen species (ROS)-generating NADPH oxidase system regulated by hypoxia in ex vivo cultures of cord blood CD34(+) cells. The results showed that NADPH oxidase activity and ROS generation were reduced in hypoxia with respect to normal oxygen tension. Meanwhile the ROS generation was found to be inhibited by diphenyleneiodonium (the NADPH oxidase inhibitor), or N-acetylcysteine (the ROS scavenger). Accordingly NADPH oxidase mRNA and p67 protein levels decreased in hypoxia. The analysis of progenitor characteristics, including the proportion of cultured cells expressing the HSPCs marker CD34(+)CD38(-), colony production ability of the colony-forming cells (CFCs), and the re-expansion capability of the cultured CD34(+) cells, showed that either 5% pO(2) or reduced ROS favored preserving the characteristics of CD34(+) progenitors, and promoted the expansion of CD34(+)CD38(-) cells as well. The above results demonstrated that hypoxia effectively maintained biological characteristics of CD34(+) cells through keeping lower intracellular ROS levels by regulating NADPH oxidase. (c) 2007 Elsevier B.V. All rights reserved.