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논문 기본 정보

자료유형
학술저널
저자정보
Cho, In-Koo (College of Pharmacy, Chung Ang University) Huh, In-Hoe (College of Pharmacy, Chung Ang University) Lee, Sang-Jun (Central Research Laboratory, Chong Kun Dang Pharmaceutical Co.) Kim, Dong-Seop (National Institute of Safety Research) Ann, Hyung-Soo (College of Pharmacy, Dong Duck Womens University)
저널정보
대한약학회 Archives of pharmacal research : a publication of the Pharmaceutical Society of Korea Archives of pharmacal research : a publication of the Pharmaceutical Society of Korea 제18권 제2호
발행연도
1995.1
수록면
105 - 112 (8page)

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In ordedr to gain insight into the mechanisms byl which erythropoietin promotes erythropoiesis, effects of various inhibitors on the erythropoietin-propmoted differentiation of erythroid progenitor cells and on the erythroid progenitor cells and on the erythropoietin-promoted $Ca^{++}$ uptake in the progenitor cells were determined, and the relationship between the inhibitory activity of each inhibitor cells were determined, and he relationship between the inhibitory activity of each inhibitor toward the differentiation and channel blocker (varapamil), a $Ca^{++}$ chelator (EDTA) and a protein kinase C inhibitor (stauroporine). All of these agents inhibited both the erythropoietin-mediated differentiation of the erythroid progenitor cells, as determined by the incroporation of $^{59}Fe$ into heme, and $Ca^{++}$ uptake in a concentrtion dependent manner. In the cases of varapamil and EDTA, the half-miximal inhibitory concentration $(IC_{50})$ values for differentiation of the progenitor cells may be theconsequence of the inhibition of the $Ca^{++}$ uptake in a concentration dependent manner. In the cases of varapamil and EDTA, the half-miximal inhibitory concentration dependent manner. In the cases of verapamil and EDTA, the half-miximal inhibitory concentration $(IC_{50})$ values for differentiation of the progenitor cells may be the consequence of the inhibition of the $Ca^{++}$ uptake by the inhibitor. On the other hand, in the cases of genistein and stauroporine, the $IC_{50}$ values for inhibition of differentitation were significantly different from that for inhibition of $Ca^{++}$uptake. These results suggest that the mechanism of inhibition of differentiation by these two inhibitors in complex. However, taken all together, the above results support the proposition that $Ca^{++}$ uptake may play a role in the erythropoietin-mediated differentiation of erythoid progenitor cells.

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