Biomaterial Database

Volume-activated chloride current in pigmented ciliary epithelial cells. 2000

L X Chen, and L W Wang

Department of Physiology, Guangdong Medical College, Zhanjiang 524023, China.CHENL1@cardiff.ac.uk

To characterize the volume-activated Cl(-) current in bovine pigmented ciliary epithelial (PCE) cells, the whole-cell patch clamp technique was employed. Exposure to a hypotonic solution induced a volume-activated Cl(-) current. The activation of the current depended on intracellular ATP. The current showed a characteristic outward rectification. There was no, or negligible, time-dependent inactivation of the current. The current-voltage relationship showed that the reversal potential of the hypotonic-activated current ( 6.3 0.5 mV) was close to the calculated equilibrium potential for Cl(-) (ECl=0 mV). Extracellular ATP inhibited both outward and inward currents, but the inhibition of outward currents was larger than that of inward currents (92% vs 74%, P<0.01). The current was also blocked by extracellular application of tamoxifen, a Cl( ) channel inhibitor, the effects of which were almost equal for both outward and inward currents (85% vs 87%, P>0.05). The properties of this current are quite similar to those of the volume-activated Cl(-) current associated with P-glycoprotein in other cell types, suggesting that P-glycoprotein may be involved in the activation of the volume-activated Cl(-) current in PCE cells.

UI	MeSH Term	Description	Entries
D002417	Cattle	Domesticated bovine animals of the genus Bos, usually kept on a farm or ranch and used for the production of meat or dairy products or for heavy labor.	Beef Cow,Bos grunniens,Bos indicus,Bos indicus Cattle,Bos taurus,Cow,Cow, Domestic,Dairy Cow,Holstein Cow,Indicine Cattle,Taurine Cattle,Taurus Cattle,Yak,Zebu,Beef Cows,Bos indicus Cattles,Cattle, Bos indicus,Cattle, Indicine,Cattle, Taurine,Cattle, Taurus,Cattles, Bos indicus,Cattles, Indicine,Cattles, Taurine,Cattles, Taurus,Cow, Beef,Cow, Dairy,Cow, Holstein,Cows,Dairy Cows,Domestic Cow,Domestic Cows,Indicine Cattles,Taurine Cattles,Taurus Cattles,Yaks,Zebus
D002478	Cells, Cultured	Cells propagated in vitro in special media conducive to their growth. Cultured cells are used to study developmental, morphologic, metabolic, physiologic, and genetic processes, among others.	Cultured Cells,Cell, Cultured,Cultured Cell
D002712	Chlorides	Inorganic compounds derived from hydrochloric acid that contain the Cl- ion.	Chloride,Chloride Ion Level,Ion Level, Chloride,Level, Chloride Ion
D002924	Ciliary Body	A ring of tissue extending from the scleral spur to the ora serrata of the RETINA. It consists of the uveal portion and the epithelial portion. The ciliary muscle is in the uveal portion and the ciliary processes are in the epithelial portion.	Corpus Ciliare,Corpus Ciliaris,Bodies, Ciliary,Body, Ciliary,Ciliare, Corpus,Ciliares, Corpus,Ciliari, Corpus,Ciliaris, Corpus,Ciliary Bodies,Corpus Ciliares,Corpus Ciliari
D004594	Electrophysiology	The study of the generation and behavior of electrical charges in living organisms particularly the nervous system and the effects of electricity on living organisms.
D004847	Epithelial Cells	Cells that line the inner and outer surfaces of the body by forming cellular layers (EPITHELIUM) or masses. Epithelial cells lining the SKIN; the MOUTH; the NOSE; and the ANAL CANAL derive from ectoderm; those lining the RESPIRATORY SYSTEM and the DIGESTIVE SYSTEM derive from endoderm; others (CARDIOVASCULAR SYSTEM and LYMPHATIC SYSTEM) derive from mesoderm. Epithelial cells can be classified mainly by cell shape and function into squamous, glandular and transitional epithelial cells.	Adenomatous Epithelial Cells,Columnar Glandular Epithelial Cells,Cuboidal Glandular Epithelial Cells,Glandular Epithelial Cells,Squamous Cells,Squamous Epithelial Cells,Transitional Epithelial Cells,Adenomatous Epithelial Cell,Cell, Adenomatous Epithelial,Cell, Epithelial,Cell, Glandular Epithelial,Cell, Squamous,Cell, Squamous Epithelial,Cell, Transitional Epithelial,Cells, Adenomatous Epithelial,Cells, Epithelial,Cells, Glandular Epithelial,Cells, Squamous,Cells, Squamous Epithelial,Cells, Transitional Epithelial,Epithelial Cell,Epithelial Cell, Adenomatous,Epithelial Cell, Glandular,Epithelial Cell, Squamous,Epithelial Cell, Transitional,Epithelial Cells, Adenomatous,Epithelial Cells, Glandular,Epithelial Cells, Squamous,Epithelial Cells, Transitional,Glandular Epithelial Cell,Squamous Cell,Squamous Epithelial Cell,Transitional Epithelial Cell
D000255	Adenosine Triphosphate	An adenine nucleotide containing three phosphate groups esterified to the sugar moiety. In addition to its crucial roles in metabolism adenosine triphosphate is a neurotransmitter.	ATP,Adenosine Triphosphate, Calcium Salt,Adenosine Triphosphate, Chromium Salt,Adenosine Triphosphate, Magnesium Salt,Adenosine Triphosphate, Manganese Salt,Adenylpyrophosphate,CaATP,CrATP,Manganese Adenosine Triphosphate,MgATP,MnATP,ATP-MgCl2,Adenosine Triphosphate, Chromium Ammonium Salt,Adenosine Triphosphate, Magnesium Chloride,Atriphos,Chromium Adenosine Triphosphate,Cr(H2O)4 ATP,Magnesium Adenosine Triphosphate,Striadyne,ATP MgCl2
D000818	Animals	Unicellular or multicellular, heterotrophic organisms, that have sensation and the power of voluntary movement. Under the older five kingdom paradigm, Animalia was one of the kingdoms. Under the modern three domain model, Animalia represents one of the many groups in the domain EUKARYOTA.	Animal,Metazoa,Animalia
D013629	Tamoxifen	One of the SELECTIVE ESTROGEN RECEPTOR MODULATORS with tissue-specific activities. Tamoxifen acts as an anti-estrogen (inhibiting agent) in the mammary tissue, but as an estrogen (stimulating agent) in cholesterol metabolism, bone density, and cell proliferation in the ENDOMETRIUM.	ICI-46,474,ICI-46474,ICI-47699,Nolvadex,Novaldex,Soltamox,Tamoxifen Citrate,Tomaxithen,Zitazonium,Citrate, Tamoxifen,ICI 46,474,ICI 46474,ICI 47699,ICI46,474,ICI46474,ICI47699
D018118	Chloride Channels	Cell membrane glycoproteins that form channels to selectively pass chloride ions. Nonselective blockers include FENAMATES; ETHACRYNIC ACID; and TAMOXIFEN.	CaCC,Calcium-Activated Chloride Channel,Chloride Ion Channel,Chlorine Channel,Ion Channels, Chloride,CaCCs,Calcium-Activated Chloride Channels,Chloride Channel,Chloride Ion Channels,Chlorine Channels,Ion Channel, Chloride,Calcium Activated Chloride Channel,Calcium Activated Chloride Channels,Channel, Calcium-Activated Chloride,Channel, Chloride,Channel, Chloride Ion,Channel, Chlorine,Channels, Calcium-Activated Chloride,Channels, Chloride,Channels, Chloride Ion,Channels, Chlorine,Chloride Channel, Calcium-Activated,Chloride Channels, Calcium-Activated