Phosphocreatine in Ehrlich ascites tumor cells detected by noninvasive 31P NMR spectroscopy.

Phosphocreatine in Ehrlich ascites tumor cells detected by noninvasive 31P NMR spectroscopy.
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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
Gupta,RK
中科院分区:
生物学4区
文献类型:
--
作者:
Yushok,WD;Gupta,RK

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具有高磷酸化潜力的完整艾氏腹水肿瘤细胞的 31P NMR 谱揭示了可归属于磷酸肌酸的明确共振峰,对应于含有 5.2 μmoles ATP/ml 的腺苷处理细胞中的 2.3 μmoles/ml 细胞 H2O。与碘乙酸和葡萄糖一起孵育的艾利希细胞的 NMR 谱表明,磷酸肌酸和 ATP 消耗至不可检测的水平,并且 1,6-二磷酸果糖大量积累。根据内部 Pi 和磷酸肌酸共振的化学位移之间的差异,在 10°C 下悬浮于 pH 7.4 培养基中的蛋白质合成细胞中,细胞内 pH 值估计为 7.1 ± 0.1。艾利希细胞无法将标记的脒基团从 L-(guanidino-14C)-精氨酸转移到大的细胞内甘氨酸池中,形成标记的胍基乙酸盐,即肌酸的去甲基化前体。这些结果意味着富含 ATP 的艾氏细胞中磷酸肌酸的合成主要受到细胞外游离肌酸供应的限制,其程度取决于荷瘤宿主的能量和氮代谢的恶病质扰动程度。
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.
DOI: 10.1016/b978-0-12-025505-4.50008-9
发表时间: 1971
影响因子: 7.4
作者:
A. Redfield;R. Gupta
通讯作者: R. Gupta
DOI: --
发表时间: 1964
期刊: Cancer Research
影响因子: 11.2
作者:
R. Mccomb;W. D. Yushok
通讯作者: W. D. Yushok
通过磷核磁共振分析完整肌肉中磷酸盐代谢物、细胞内 pH 值和三磷酸腺苷的状态。
DOI: --
发表时间: 1976
影响因子: 4.8
作者:
Burt Ct;T. Glonek;M. Bárány
通讯作者: M. Bárány
DOI: 10.1021/ac60228a008
发表时间: 1965
影响因子: 7.4
作者:
J. V. Benson;J. A. Patterson
通讯作者: J. A. Patterson
磷酸肌酸对腺苷酸脱氨酶的抑制作用主要是由于焦磷酸盐。
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