Functional properties of endogenous receptor- and store-operated calcium influx channels in HEK293 cells

被引:50
作者
Bugaj, V
Alexeenko, V
Zubov, A
Glushankova, L
Nikolaev, A
Wang, ZN
Kaznacheyeva, E
Bezprozvanny, I
Mozhayeva, GN
机构
[1] Univ Texas, SW Med Ctr, Dept Physiol, Dallas, TX 75235 USA
[2] Russian Acad Sci, Inst Cytol, St Petersburg 194064, Russia
关键词
D O I
10.1074/jbc.M500192200
中图分类号
Q5 [生物化学]; Q7 [分子生物学];
学科分类号
071010 ; 081704 ;
摘要
Activation of phospholipase C (PLC)-mediated signaling pathways in non-excitable cells causes the release of calcium (Ca2+) from inositol 1,4,5-trisphosphate (InsP(3))sensitive intracellular Ca-2+ stores and activation of Ca2+ influx via plasma membrane Ca2+ channels. The properties and molecular identity of plasma membrane Ca2+ influx channels in non-excitable cells is a focus of intense investigation. In the previous studies we used patch clamp electrophysiology to describe the properties of Ca2+ influx channels in human carcinoma A431 cell lines. Now we extend our studies to human embryonic kidney HEK293 cells. By using a combination of Ca2+ imaging and whole cell and single channel patch clamp recordings we discovered that: 1) HEK293 cells contain four types of plasma membrane Ca2+ influx channels: I-CRAC, I-min, I-max, and I-NS; 2) I-CRAC channels are highly Ca2+- selective (P-Ca/Cs > 1000) and I-CRAC single channel conductance is too small for single channel analysis; 3) Imin channels in HEK293 cells display functional properties identical to Imin channels in A431 cells, with single channel conductance of 1.2 pS for divalent cations, 10 pS for monovalent cations, and divalent cation selectivity P-Ba/K = 20; 4) I-min channels in HEK293 cells are activated by InsP3 and inhibited by phosphatidylinositol 4,5-bisphosphate, but store-independent; 5) when compared with Imin, Imax channels have higher conductance for divalent ( 17 pS) and monovalent ( 33 pS) cations, but less selective for divalent cations (P-Ba/K = 4), 6) I-max channels in HEK293 cells can be activated by InsP(3) or by Ca2+ store depletion; 7) INS channels are non-selective (P-Ba/K = 0.4) and display a single channel conductance of 5 pS; and 8) INS channels are not gated by InsP(3) but activated by depletion of intracellular Ca2+ stores. Our findings provide novel information about endogenous Ca2+ channels supporting receptor-operated and store-operated Ca2+ influx pathways in HEK293 cells.
引用
收藏
页码:16790 / 16797
页数:8
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共 45 条
  • [1] A NON-SELECTIVE CATION CONDUCTANCE IN FROG-MUSCLE MEMBRANE BLOCKED BY MICROMOLAR EXTERNAL CALCIUM-IONS
    ALMERS, W
    MCCLESKEY, EW
    PALADE, PT
    [J]. JOURNAL OF PHYSIOLOGY-LONDON, 1984, 353 (AUG): : 565 - 583
  • [2] On the molecular basis and regulation of cellular capacitative calcium entry: Roles for Trp proteins
    Birnbaumer, L
    Zhu, X
    Jiang, MS
    Boulay, G
    Peyton, M
    Vannier, B
    Brown, D
    Platano, D
    Sadeghi, H
    Stefani, E
    Birnbaumer, M
    [J]. PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA, 1996, 93 (26) : 15195 - 15202
  • [3] TRP is cracked but is CRAC TRP?
    Clapham, DE
    [J]. NEURON, 1996, 16 (06) : 1069 - 1072
  • [4] The TRP ion channel family
    Clapham, DE
    Runnels, LW
    Strübing, C
    [J]. NATURE REVIEWS NEUROSCIENCE, 2001, 2 (06) : 387 - 396
  • [5] Duplexes of 21-nucleotide RNAs mediate RNA interference in cultured mammalian cells
    Elbashir, SM
    Harborth, J
    Lendeckel, W
    Yalcin, A
    Weber, K
    Tuschl, T
    [J]. NATURE, 2001, 411 (6836) : 494 - 498
  • [6] Differential expression of mammalian TRP homologues across tissues and cell lines
    Garcia, RL
    Schilling, WP
    [J]. BIOCHEMICAL AND BIOPHYSICAL RESEARCH COMMUNICATIONS, 1997, 239 (01) : 279 - 283
  • [7] Trp proteins form store-operated cation channels in human vascular endothelial cells
    Groschner, K
    Hingel, S
    Lintschinger, B
    Balzer, M
    Romanin, C
    Zhu, X
    Schreibmayer, W
    [J]. FEBS LETTERS, 1998, 437 (1-2) : 101 - 106
  • [8] The store-operated calcium entry pathways in human carcinoma A431 cells: Functional properties and activation mechanisms
    Gusev, K
    Glouchankova, L
    Zubov, A
    Kaznacheyeva, E
    Wang, ZN
    Bezprozvanny, I
    Mozhayeva, GN
    [J]. JOURNAL OF GENERAL PHYSIOLOGY, 2003, 122 (01) : 81 - 94
  • [9] A simplified system for generating recombinant adenoviruses
    He, TC
    Zhou, SB
    da Costa, LT
    Yu, J
    Kinzler, KW
    Vogelstein, B
    [J]. PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA, 1998, 95 (05) : 2509 - 2514
  • [10] MECHANISM OF ION PERMEATION THROUGH CALCIUM CHANNELS
    HESS, P
    TSIEN, RW
    [J]. NATURE, 1984, 309 (5967) : 453 - 456