Protein Information

Name potassium ion channels
Synonyms Cyclic GMP gated potassium channel; KCNA10; Kcn1; Kv1.8; Potassium ion channel; Kcn1s; Kv1.8s; Potassium ion channels

Compound Information

Name 4-aminopyridine
CAS 4-pyridinamine

Reference List

PubMed Abstract RScore(About this table)
12768777 Yang J, Wang J: [Outward potassium currents in isolated Deiters' cells of guinea pig cochlea]. Zhonghua Er Bi Yan Hou Ke Za Zhi. 2000 Jun;35(3):200-3.

METHODS: Potassium currents in Deiters' cells in normal external solution, in external solutions with different K+ concentrations effecting on reversal potentials and outward potassium currents, 4-aminopyridine (4-AP) and tetraethylammonium (TEA) blocking components of outward potassium currents and kinetics of activation and inactivation of potassium ion channels were studied using the whole cell variant of the patch clamp technique.
81(1,1,1,1) Details
20179886 Song SL, Wei CL, Gu HG, Liu ZQ, Ren W: [The modulation of 4-aminopyridine sensitive potassium channel to bifurcation scenario of the spontaneous neural firing rhythms.]. Sheng Li Xue Bao. 2010 Feb 25;62(1):35-41.

Briefly, when concentration of 4-aminopyridine (4-AP), a voltage-dependent potassium ion channels blocker, was kept at different level and extracellular Ca (2+) concentration was decreased gradually, different bifurcation scenarios of firing patterns were exhibited in an identical neural pacemaker.
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12296855 Qiu MR, Campbell TJ, Breit SN: A potassium ion channel is involved in cytokine production by activated human macrophages. Clin Exp Immunol. 2002 Oct;130(1):67-74.

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18719098 Zhan D, Fan FR, Bard AJ: The Kv channel blocker 4-aminopyridine enhances Ag+ uptake: a scanning electrochemical microscopy study of single living cells. Proc Natl Acad Sci U S A. 2008 Aug 26;105(34):12118-22. Epub 2008 Aug 21.

We report that silver ion (Ag (+)) uptake is enhanced by 4-aminopyridine (4-AP), a well known voltage-sensitive potassium ion channel (K (v)) blocker.
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17014896 Zhanping W, Xiaoyu P, Na C, Shenglan W, Bo W: Voltage-gated K+ channels are associated with cell proliferation and cell cycle of ovarian cancer cell. Gynecol Oncol. 2007 Feb;104(2):455-60. Epub 2006 Oct 2.

OBJECTIVES: To study the role of Voltage-gated potassium ion channels (Kv) in cell proliferation and cell cycle of ovarian cancer cell.
RESULTS: 4-Aminopyridine, an inhibitor of voltage-gated K+ channels, significantly inhibited the proliferation of A2780 cells as measured by MTT. 4-Aminopyridine also significantly affected the cell cycle, which increased the percentage of cells in G0/G1, and reduced the percentage of cells in S phase and G2/M phase.
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12168055 Abdul M, Hoosein N: Voltage-gated potassium ion channels in colon cancer. . Oncol Rep. 2002 Sep-Oct;9(5):961-4.

PC-blockers such as glibenclamide inhibited cellular proliferation at concentrations above 50 microg/ml while tetraethylammonium and 4-aminopyridine (up to 100 microg/ml) did not have significant growth-suppressive effects.
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10836990 Lang R, Lee G, Liu W, Tian S, Rafi H, Orias M, Segal AS, Desir GV: KCNA10: a novel ion channel functionally related to both voltage-gated potassium and CNG cation channels. Am J Physiol Renal Physiol. 2000 Jun;278(6):F1013-21.

The channel displays an unusual inhibitor profile because, in addition to being blocked by classical K channel blockers (barium tetraethylammonium and 4-aminopyridine), it is also sensitive to inhibitors of cyclic nucleotide-gated (CNG) cation channels (verapamil and pimozide).
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15273397 Bernard C, Anderson A, Becker A, Poolos NP, Beck H, Johnston D: Acquired dendritic channelopathy in temporal lobe epilepsy. . Science. 2004 Jul 23;305(5683):532-5.


The excitability of CA1 pyramidal neuron dendrites was increased in TLE because of decreased availability of A-type potassium ion channels due to transcriptional (loss of channels) and posttranslational (increased channel phosphorylation by extracellular signal-regulated kinase) mechanisms.
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