Biomaterial Database

Characterization of alpha-2D adrenergic receptor subtypes in bovine ocular tissue homogenates. 1997

D B Bylund, and L J Iversen, and W J Matulka, and D M Chacko

Department of Pharmacology, University of Nebraska Medical Center, Omaha 68198-6260, USA.

The alpha-2 adrenergic receptors are known to be present in the mammalian eye and to mediate the effects of alpha-2 agonists used in the treatment of glaucoma. Little is known, however, regarding the relative densities of the three alpha-2 subtypes in the various tissues of the eye. We used receptor binding experiments with the radioligand [3H]RX821002 to characterize the alpha-2 adrenergic receptors in three tissues of the bovine eye, the ciliary body, retinal pigment epithelium/choriocapillaris and iris. The K(D) values in the three tissues were similar (0.12-0.14 nM), and the Bmax values ranged from 100 fmol/mg of protein for the ciliary body and retinal pigment epithelium/choriocapillaris to 200 fmol/mg of protein for the iris. The pharmacological characteristics of the alpha-2 receptors in all three tissues of the bovine eye, as assessed by competition studies, were essentially identical and were similar to the characteristics of the alpha-2A/D receptors of the bovine neurosensory retina. The correlation coefficients between the logarithms of the Ki values for the three tissues and the neurosensory retina for nine adrenergic agents were .98 to .99. We conclude that the alpha-2 adrenergic receptors in the ciliary body, iris and retinal pigment epithelium/choriocapillaris of the bovine eye are mainly alpha-2D.

UI	MeSH Term	Description	Entries
D007498	Iris	The most anterior portion of the uveal layer, separating the anterior chamber from the posterior. It consists of two layers - the stroma and the pigmented epithelium. Color of the iris depends on the amount of melanin in the stroma on reflection from the pigmented epithelium.
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
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
D004305	Dose-Response Relationship, Drug	The relationship between the dose of an administered drug and the response of the organism to the drug.	Dose Response Relationship, Drug,Dose-Response Relationships, Drug,Drug Dose-Response Relationship,Drug Dose-Response Relationships,Relationship, Drug Dose-Response,Relationships, Drug Dose-Response
D005123	Eye	The organ of sight constituting a pair of globular organs made up of a three-layered roughly spherical structure specialized for receiving and responding to light.	Eyes
D000317	Adrenergic alpha-Antagonists	Drugs that bind to but do not activate alpha-adrenergic receptors thereby blocking the actions of endogenous or exogenous adrenergic agonists. Adrenergic alpha-antagonists are used in the treatment of hypertension, vasospasm, peripheral vascular disease, shock, and pheochromocytoma.	Adrenergic alpha-Receptor Blockaders,alpha-Adrenergic Blocking Agents,alpha-Adrenergic Receptor Blockaders,alpha-Blockers, Adrenergic,Adrenergic alpha-Blockers,alpha-Adrenergic Antagonists,alpha-Adrenergic Blockers,Adrenergic alpha Antagonists,Adrenergic alpha Blockers,Adrenergic alpha Receptor Blockaders,Agents, alpha-Adrenergic Blocking,Antagonists, alpha-Adrenergic,Blockaders, Adrenergic alpha-Receptor,Blockaders, alpha-Adrenergic Receptor,Blockers, alpha-Adrenergic,Blocking Agents, alpha-Adrenergic,Receptor Blockaders, alpha-Adrenergic,alpha Adrenergic Antagonists,alpha Adrenergic Blockers,alpha Adrenergic Blocking Agents,alpha Adrenergic Receptor Blockaders,alpha Blockers, Adrenergic,alpha-Antagonists, Adrenergic,alpha-Receptor Blockaders, Adrenergic
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
D018341	Receptors, Adrenergic, alpha-2	A subclass of alpha-adrenergic receptors found on both presynaptic and postsynaptic membranes where they signal through Gi-Go G-PROTEINS. While postsynaptic alpha-2 receptors play a traditional role in mediating the effects of ADRENERGIC AGONISTS, the subset of alpha-2 receptors found on presynaptic membranes signal the feedback inhibition of NEUROTRANSMITTER release.	Adrenergic alpha-2 Receptors,Receptors, alpha-2 Adrenergic,alpha-2 Adrenergic Receptors,Adrenergic Receptor alpha(2C),Adrenergic Receptor alpha(2d),Adrenergic Receptor alpha-2C,Adrenergic Receptor alpha-2b,Adrenergic Receptor, alpha-2,Adrenergic alpha-2A Receptors,Adrenergic alpha-2B Receptors,Adrenergic alpha-2C Receptors,Adrenergic alpha-2D Receptors,Receptor, Adrenergic, alpha-2,Receptor, Adrenergic, alpha-2A,Receptor, Adrenergic, alpha-2B,Receptor, Adrenergic, alpha-2C,Receptor, Adrenergic, alpha-2D,Receptors, Adrenergic, alpha-2A,Receptors, Adrenergic, alpha-2B,Receptors, Adrenergic, alpha-2D,alpha 2 Adrenergic Receptors,alpha-2A Adrenergic Receptor,alpha-2B Adrenergic Receptor,alpha-2C Adrenergic Receptor,alpha-2D Adrenergic Receptor,Adrenergic Receptor alpha 2C,Adrenergic Receptor alpha 2b,Adrenergic Receptor, alpha 2,Adrenergic Receptor, alpha-2A,Adrenergic Receptor, alpha-2B,Adrenergic Receptor, alpha-2C,Adrenergic Receptor, alpha-2D,Adrenergic Receptors, alpha-2,Adrenergic alpha 2 Receptors,Adrenergic alpha 2A Receptors,Adrenergic alpha 2B Receptors,Adrenergic alpha 2C Receptors,Adrenergic alpha 2D Receptors,Receptor alpha-2C, Adrenergic,Receptor alpha-2b, Adrenergic,Receptor, alpha-2 Adrenergic,Receptor, alpha-2A Adrenergic,Receptor, alpha-2B Adrenergic,Receptor, alpha-2C Adrenergic,Receptor, alpha-2D Adrenergic,Receptors, Adrenergic alpha-2,Receptors, Adrenergic alpha-2A,Receptors, Adrenergic alpha-2B,Receptors, Adrenergic alpha-2C,Receptors, Adrenergic alpha-2D,Receptors, alpha 2 Adrenergic,alpha 2A Adrenergic Receptor,alpha 2B Adrenergic Receptor,alpha 2C Adrenergic Receptor,alpha 2D Adrenergic Receptor,alpha-2 Adrenergic Receptor,alpha-2 Receptors, Adrenergic,alpha-2A Receptors, Adrenergic,alpha-2B Receptors, Adrenergic,alpha-2C Receptors, Adrenergic,alpha-2C, Adrenergic Receptor,alpha-2D Receptors, Adrenergic,alpha-2b, Adrenergic Receptor
D019329	Idazoxan	A benzodioxane-linked imidazole that has alpha-2 adrenoceptor antagonist activity.	Idazoxan Hydrochloride,RX-781094,Hydrochloride, Idazoxan,RX 781094,RX781094