Phosphocreatine in Ehrlich ascites tumor cells detected by noninvasive 31P NMR spectroscopy.
Phosphocreatine in Ehrlich ascites tumor cells detected by noninvasive 31P NMR spectroscopy.
复制标题
通过无创 31P NMR 光谱检测艾氏腹水肿瘤细胞中的磷酸肌酸。
DOI:
10.1016/0006-291x(80)90706-8
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发表时间:
1980
影响因子:
3.1
通讯作者:
Gupta,RK
中科院分区:
文献类型:
--
作者:
Yushok,WD;Gupta,RK
31P NMR spectra of intact Ehrlich ascites tumor cells of high phosphorylation potential reveal a well-defined resonance peak assignable to phosphocreatine, corresponding to 2.3 μmoles/ml cell H2O in adenosine-treated cells containing 5.2 μmoles ATP/ml. The NMR spectrum of Ehrlich cells incubated with iodoacetate and glucose indicates depletion of phosphocreatine and ATP to undetectable levels and substantial accumulation of fructose-1,6-bisphosphate. From the difference between the chemical shifts of internal Piand phosphocreatine resonances, the intracellular pH was estimated to be 7.1 ± 0.1 in protein-synthesizing cells suspended in a medium of pH 7.4 at 10°C. Ehrlich cells are unable to transfer the labeled amidine group from L-(guanidino-14C)-arginine to the large intracellular glycine pool to form labeled guanidinoacetate, the demethylated precursor of creatine. These results imply that the synthesis of phosphocreatine in ATP-rich Ehrlich cells is limited primarily by the extracellular free creatine supply, the extent of which depends upon the degree of cachectic perturbation of energy and nitrogen metabolism of the tumor-bearing host.
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影响因子:
7.4
作者:
A. Redfield;R. Gupta
通讯作者:
R. Gupta
影响因子:
11.2
作者:
R. Mccomb;W. D. Yushok
通讯作者:
W. D. Yushok
影响因子:
4.8
作者:
Burt Ct;T. Glonek;M. Bárány
通讯作者:
M. Bárány
影响因子:
7.4
作者:
J. V. Benson;J. A. Patterson
通讯作者:
J. A. Patterson
DOI:
10.1016/s0021-9258(17)37794-3
发表时间:
1979
期刊:
The Journal of biological chemistry
影响因子:
--
作者:
T. J. Wheeler;J. Lowenstein
通讯作者:
J. Lowenstein