The cell boundary theorem: a simple law of the control of cytosolic calcium concentration.

The cell boundary theorem: a simple law of the control of cytosolic calcium concentration.
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DOI:
10.1007/s12576-009-0069-z
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发表时间:
2010-01
影响因子:
2.3
通讯作者:
Rios, Eduardo
Rios, Eduardo
中科院分区:
医学4区
文献类型:
--
作者:
Rios, Eduardo

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目前使用的许多分子生物学干预措施,以及遗传性疾病条件,改变了结合Ca2+或通道的分子的细胞内禀赋,以及将其转移到细胞内储存细胞器的泵。一个被称为“细胞边界定理”的简单定律指出,在真正的静息状态下,细胞内的改变不能直接导致细胞质浓度[Ca2+]i的变化。给出了该定理的有效性的一个证明。然后讨论了增加Ca2+从存储细胞器泄漏并导致更大的静息[Ca2+]i的干预措施或疾病的几个例子。根据该定理,[Ca2+]i的增加不可能是更大泄漏的直接后果。其主要原因一定是质膜水平上通量的变化,而这种变化是由某种“储存式Ca2+进入”导致的泄漏增加引起的。虽然该定律是在Ca2+稳态方面讨论的,但它适用于任何可能通过质膜运输的溶质。
Many molecular biological interventions in current use, as well as inheritable disease conditions, modify the intracellular endowment of molecules that bind Ca2+ or channels and pumps that transfer it to and from intracellular storage organelles. A simple law, named the “cell boundary theorem,” states that intracellular alterations cannot directly result in changes in the cytosolic concentration, [Ca2+]i, in a true resting state. A demonstration of the validity of this theorem is provided. Several examples are then discussed of interventions or diseases that increase leak of Ca2+ from storage organelles and result in greater resting [Ca2+]i. According to the theorem, the increase in [Ca2+]i cannot be a direct consequence of the greater leak. Its primary cause must be a change of the fluxes at the level of the plasmalemma, caused in turn by the increase in leak through some sort of “store-operated Ca2+ entry.” While the law is discussed in terms of Ca2+ homeostasis, it applies to any solute that may be transported by the plasma membrane.
DOI: 10.1113/jphysiol.1984.sp015281
发表时间: 1984-01-01
影响因子: 5.5
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