Caffeine, an inhibitor of endocytosis in dictyostelium discoideum amoebae

Caffeine, an inhibitor of endocytosis in dictyostelium discoideum amoebae
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咖啡因,盘基网柄菌阿米巴内吞作用的抑制剂

DOI:
10.1002/jcp.1041440307
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发表时间:
1990
影响因子:
5.6
通讯作者:
M. Satre
M. Satre
中科院分区:
生物学2区
文献类型:
--
作者:
C. González;G. Klein;M. Satre

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研究了三甲基黄嘌呤(咖啡因)对细胞黏菌Dic‐ tyosteelium discoideum的营养阿米巴的生长和内吞途径的影响。发现浓度为1.5-3 mM的咖啡因可抑制无菌生长、液相胞饮作用和溶酶体酶分泌。细胞活力不受5 mM咖啡因孵育16小时的影响,但此后显著下降。尽管咖啡因的浓度高出两倍至三倍,但阿米巴网柄藻对埃施-埃里希氏大肠杆菌的吞噬作用也受到咖啡因的抑制。咖啡因迅速进入变形虫体内,达到细胞外和细胞内浓度之间的平衡,并且不被网骨藻代谢。生长和内吞作用的抑制是可逆的药物去除后,部分抵消了10 mM腺苷。由于咖啡因释放了网骨藻中的细胞内钙储存(Abe等人,1988),其对内吞作用的抑制作用可能是由于钙稳态的扰动。与这一假设一致,阳离子La 3+(10 μM),一种Ca 2+转运抑制剂,也强烈降低了液相松质孢子化。
The effect of the trimethylxanthine, caffeine, was examined on the growth and endocytosis pathways of the vegetative amoebae of the cellular slime mold Dic‐tyostelium discoideum. Caffeine at concentrations of 1.5–3 mM was found to inhibit axenic growth, fluid‐phase pinocytosis, and secretion of lysosomal enzymes. Cell viability was unaffected by incubation for 16 hours with 5 mM caffeine but decreased markedly thereafter. Phagocytosis of the bacterium Esch‐erichia coli by Dictyostelium amoebae was also inhibited by caffeine, although at concentrations twofold to threefold higher. Caffeine rapidly entered into amoebae to reach an equilibrium between extracellular and intracellular concentrations, and it was not appreciably metabolized by Dictyostelium. Inhibition of growth and endocytosis was reversible upon removal of the drug and was partially counteracted by 10 mM adenosine. As caffeine discharged intracellular calcium stores in Dictyostelium (Abe et al., 1988), its inhibitory effect on endocytosis could result from the perturbation of calcium homeostasis. In agreement with this hypothesis, the cation La3+ (10 μM), a Ca2+‐transport inhibitor, also strongly reduced fluid‐phase pinocy'osis.
盘基网柄菌中 cAMP 受体的鉴定和配体诱导修饰。
DOI: 10.1016/0076-6879(88)59027-4
发表时间: 1988
影响因子: --
作者:
Klein,P;Theibert,A;Devreotes,P
通讯作者: Devreotes,P
锰和腺苷类似物对盘基网柄菌腺苷酸环化酶的调节。
DOI: 10.1016/0167-4889(87)90140-6
发表时间: 1987
期刊: Biochimica et biophysica acta
影响因子: --
作者:
Khachatrian,L;Klein,C;Howlett,A
通讯作者: Howlett,A
盘基网柄菌的纯突变和内吞作用。
DOI: 10.1016/s0091-679x(08)61642-8
发表时间: 1987
影响因子: --
作者:
Clarke,M;Kayman,SC
通讯作者: Kayman,SC
盘基网柄菌饥饿期间咖啡因、腺苷和缓冲离子组合物对诱导细胞表面 cAMP 结合的影响。
DOI: 10.1002/dvg.1020090411
发表时间: 1988
期刊: Developmental genetics
影响因子: --
作者:
Drummond,IA;Chisholm,RL
通讯作者: Chisholm,RL
DOI: --
发表时间: 1981
期刊: The Journal of biological chemistry
影响因子: --
作者:
Dimond,RL;Burns,RA;Jordan,KB
通讯作者: Jordan,KB