Dynamics of the internalization of phosphodiester oligodeoxynucleotides in HL60 cells.
Dynamics of the internalization of phosphodiester oligodeoxynucleotides in HL60 cells.
复制标题
HL60 细胞中磷酸二酯寡脱氧核苷酸内化的动态。
作者:
C. Stein;J. Tonkinson;L. M. Zhang;L. Yakubov;J. Gervasoni;R. Taub;S. Rotenberg
We have examined the cellular association and internalization of phosphodiester (PO) oligodeoxynucleotides (oligos) with HL60 cells. At 4 degrees C, a 15-mer PO homopolymer of thymidine (FOdT15) exhibits apparent saturation binding (Km = 22 +/- 1 nM) that is competitive with the binding of phosphorothioate (PS) oligos. The value of Kc for SdC28, a PS 28-mer homopolymer of cytidine, is 5 +/- 2 nM. SdC28 was used to strip cell surface fluorescence: Internalized fluorescence accumulated in a (concentration)(time)-dependent fashion, consistent with a pinocytotic mechanism. PS, and to a lesser extent, PO oligos inhibited the rate of internalization of fluorescent albumin, also a marker of pinocytosis. This was correlated with direct in vitro inhibition of protein kinase C (PKC) beta 1 by the PS and PO oligos. Furthermore, other PKC inhibitors (H7, staurosporine, DMSO, PKC pseudosubstrate polypeptide) also inhibited intracellular accumulation of pinocytosed materials, perhaps by stimulating the exocytosis rate. In HL60 cells, the pinocytotic internalization of charged oligos appears to be dependent on intact PKC kinase activity, which is inhibited in vitro by PS and PO oligos.
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影响因子:
11.2
作者:
Rotenberg,SA;Smiley,S;Ueffing,M;Krauss,RS;Chen,LB;Weinstein,IB
通讯作者:
Weinstein,IB
影响因子:
15.9
作者:
BENNETT, RM;GABOR, GT;MERRITT, MM
通讯作者:
MERRITT, MM
影响因子:
14.9
作者:
Shoji,Y;Akhtar,S;Periasamy,A;Herman,B;Juliano,RL
通讯作者:
Juliano,RL
DOI:
--
发表时间:
1991
期刊:
The Journal of biological chemistry
影响因子:
--
作者:
Herrick-Davis,K;Camussi,G;Bussolino,F;Baglioni,C
通讯作者:
Baglioni,C
影响因子:
11.2
作者:
Calabretta,B
通讯作者:
Calabretta,B